AI Writing Tools Comparison 2026: Notion AI, DeepL Write, Jasper and 7 More (Pricing & Free Plans)

When choosing an AI writing tool, many people are unsure about pricing structures, the availability of a free plan, and the extent of Japanese support. It is also important to know whether the tool works in your usual environments, such as a browser, Word, or mobile apps.

This article compares 10 major tools, including Notion AI, DeepL Write, and Jasper. Based on AIpedia data as of November 2026, we have organized pricing, free plan availability, Japanese support, platforms, and the strengths and things to note for each tool.

We also recommend tools by goal, such as article creation, proofreading, and creative writing. We also explain how to choose without regrets.

What Are AI Writing Tools? What They Can Do and What to Know Before Choosing

AI writing tools support various stages of the writing process, such as drafting, summarizing, translating, and grammar checking. For example, Notion AI allows you to request drafts or rewrites directly on a page, while DeepL Write suggests corrections for typos and alternative phrasings in Japanese. Additionally, Catchy and Value AI Writer byGMO specialize in generating Japanese ad copy and SEO articles, and Jasper supports creating marketing content aligned with your brand voice.

• Drafting and Rewriting: Tools like Notion AI and Rytr help improve existing text or create new content.
• Proofreading and Editing: DeepL Write, Bunken, and Grammarly check for grammar and expression errors and suggest corrections.
• Summarizing and Translating: Notion AI and Quillbot summarize long texts and translate between languages.
• Purpose-Specific Generation: Catchy and Value AI Writer byGMO generate text tailored to specific goals, such as ad copy or SEO articles.
• Creative Writing Support: Sudowrite assists with continuing novels or scripts and adding descriptive details.

When choosing a tool, check the scope of free usage and whether it offers Japanese support. For example, Catchy and Value AI Writer byGMO have free plans you can try, but Jasper does not offer a free plan. Also, Grammarly does not support Japanese proofreading, so it is intended for English-centric work.

Furthermore, consider your usage environment and whether the tool is designed for individuals or businesses. Notion AI allows continuous use on Business plans and above, while Bunken offers a team dictionary sharing feature. On the other hand, Sudowrite specializes in writing novels and scripts. Please check each official website for the latest pricing and feature details.

Comparison of Top 10 Tools (Pricing, Japanese Support, Platforms)

Tool	AIpedia rating	Main plans	Japanese support	Platforms
Notion AI	4.2	Free ¥0 (Notion AI is trial only) / Plus ¥1,650/member/month (annual billing; monthly billing is ¥2,000. Notion AI is trial only)	Supported	Web, Windows, Mac, iOS, and others
DeepL Write	4.3	Free (up to 1,500 characters per use)	Supported	Web, desktop apps (Windows, Mac), mobile apps (iOS, Android), browser extensions (Chrome, Edge, Firefox), and others
Jasper	4.1	Pro $59/month (1 seat, annual billing; monthly billing is $69) / Business (contact sales; 12-month contract minimum). No free plan. Pro includes a 7-day free trial (credit card registration required). Priced in US dollars	Partially supported	Web, Chrome extension, Edge extension, API (Business plan)
Catchy	3.9	Free (10 credits per month, no credit card required) / Starter from ¥3,000/month (100 credits per month. 200 credits is ¥5,700, 300 credits is ¥8,100)	Supported (Domestic service. Interface and output are in Japanese)	Web
Bunken	4	Personal ¥1,650/month (1-year renewal; 1-month renewal is ¥1,980. For 1 user only) / Business Team ¥2,750/user/month (1-year renewal; 1-month renewal is ¥3,300) Tax included. 14-day free trial available.	Supported (Domestic service. Specialized in Japanese text checking)	Web (PC browser)
Value AI Writer byGMO	3.8	Free ¥0 (1 article per month) / Entry ¥840/month (3 articles per month) / Entry Plus ¥1,400/month (5 articles per month)	Supported (Domestic service. Interface and output are in Japanese)	Web (Browser on PC, smartphone, tablet)
Rytr	3.8	Free (10,000 characters per month) / Lite $9/month (Unlimited characters) / Personal $19/month	Partially supported	Web, Chrome extension
Quillbot	4.3	Free (Paraphrasing limited to 100 words and 2 modes per use) / Premium $8.33/month ($99.95 annual billing; monthly billing is $19.95, quarterly billing is $39.95, semi-annual billing is $79.95)	Partially supported	Web, Chrome extension, Edge extension, Safari extension, and others
Grammarly	4.4	Free (100 AI prompts per month) / Pro $12/month ($144 annual billing; monthly billing is $30, quarterly billing is $60. 2,000 AI prompts per month, for 1–149 users)	Not supported	Web, Windows, Mac, browser extensions (Chrome, Safari, Firefox, Edge), and others
Sudowrite	4	Hobby & Student $10/month (annual billing; monthly billing is $19. 225,000 credits per month) / Professional $22/month (annual billing; monthly billing is $29. 1,000,000 credits per month)	Partially supported	Web, iOS, Android

Ratings are based on a 5-point scale by the AIpedia editorial team. Pricing and plans may change. Please check the official website of each tool for the latest information before signing up.

Features, Pricing, and Best Use Cases for 10 Tools

1. Notion AI

Notion AI is an AI feature built into Notion, a platform for managing documents and databases. You can select text on a page to request summaries, translations, grammar corrections, or tone adjustments. It also offers agents that perform tasks on your behalf and AI meeting notes.

• Strengths: You can draft and rewrite content directly on Notion pages, eliminating the need to switch between tools.
• Strengths: It can reference materials in your workspace and information from connected apps to generate text.
• Strengths: The interface can be set to Japanese, and pricing is displayed in Japanese yen, which enhances convenience.
• Things to note: To use Notion AI continuously, you need a Business plan or higher.
• Things to note: Running custom agents requires purchasing Notion Credits separately from the plan fee.

Pricing: Free ¥0 (Notion AI is trial only) / Plus ¥1,650/member/month (annual billing; monthly billing is ¥2,000. Notion AI is trial only) / Business ¥3,150/member/month (annual billing; monthly billing is ¥3,800. Includes Notion AI) / Enterprise (contact sales). Japanese consumption tax applies separately where applicable. Custom agents require Notion Credits ($10/month per 1,000 credits)

Best for: Users who already use Notion and want to handle not just writing but also meeting notes and information retrieval in one place. However, if you only need to write text, the cost may be higher compared to dedicated tools.

View detailed features, pricing, and FAQ for Notion AI

2. DeepL Write

DeepL Write is an AI writing assistant developed by DeepL, a translation service provider. It corrects grammar, spelling, and punctuation in your input text and suggests alternative word choices or sentence structures. It supports nine languages, including Japanese, automatically detects the language, and displays improvement suggestions.

• Strengths: You can use it for free up to 1,500 characters per request. It is available across various platforms, including web, desktop, mobile, browser extensions, and Microsoft Word.
• Strengths: Paid plans have no character limits and include a data protection feature that does not save input text while logged in.
• Things to note: The feature to specify writing style or tone is currently unavailable for Japanese, Chinese, and Korean. Also, Write Pro cannot be purchased standalone; it must be added to a DeepL Pro translation plan.

Pricing: Free (up to 1,500 characters per request) / Write Pro Add-on ¥1,150/user/month (annual billing. Added to DeepL Pro Individual ¥1,150/month [annual billing; monthly billing is ¥1,380] or Team ¥3,750/user/month [annual billing; monthly billing is ¥4,500]) / DeepL Pro Business ¥7,500/user/month (annual billing; monthly billing is ¥9,000. Includes Write Pro) / Enterprise (contact sales). Prices include tax.

Best for: Individuals who want to easily proofread and rephrase Japanese text across various environments. It is also suitable for business professionals who want to use the service without character limits while minimizing data storage risks.

View detailed features, pricing, and FAQ for DeepL Write

3. Jasper

Jasper is an AI content creation platform designed for marketing teams. By registering your brand voice and internal documents, you can create blog posts, ads, emails, and more that align with your brand. It also supports content creation in over 30 languages, as well as image generation and editing.

• Strengths: You can use AI agents specialized for different marketing tasks.
• Strengths: You can set the output language to Japanese and switch it on a per-project basis.
• Strengths: It can be used on other web services via Chrome or Edge extensions.
• Things to note: There is no free plan, and the Pro plan starts at $59/month with annual billing.
• Things to note: API access and no-code agent creation are limited to the Business plan.

Pricing: Pro $59/month (1 seat, annual billing. Monthly billing is $69) / Business (contact sales; 12-month contract minimum). No free plan. Pro includes a 7-day free trial (credit card registration required). Priced in US dollars

Best for: Marketing professionals who want a consistent brand tone, and teams that want to produce content efficiently at scale. Since pricing is in US dollars, consider exchange-rate changes.

View detailed features, pricing, and FAQ for Jasper

4. Catchy

Catchy is a Japanese-supporting AI writing tool operated by Digital Recipe Co., Ltd. You can select from over 100 use-case-specific tools to create copy, ad text, articles, emails, and more. Both the interface and generated results are fully available in Japanese.

• Strengths: Over 100 generation tools are available, supporting copywriting based on marketing frameworks like AIDA and PAS.
• Strengths: There is a free plan that requires no credit card registration, allowing you to try up to 10 credits per month.
• Strengths: The Pro plan offers unlimited credits, so you can use it without limits on the number of generations.
• Things to note: The Starter plan uses a credit system, so there is a monthly limit on the number of generations.
• Things to note: Payment is accepted only via credit card, and displayed prices are tax-exclusive, so consumption tax applies separately.
• Things to note: The official pricing page was published in February 2024, and it cannot be confirmed whether the listed content is current. Please verify the latest pricing before signing up.

Pricing: Free (10 credits/month, no credit card required) / Starter from ¥3,000/month (100 credits/month. 200 credits is ¥5,700, 300 credits is ¥8,100) / Pro ¥9,800/month (unlimited credits) / Enterprise (contact sales). Prices exclude consumption tax.

Best for: Those who often write Japanese catchphrases or ad copy, and those who want to try AI writing on the free plan. If you need to generate large amounts of text, consider the Pro plan.

View detailed features, pricing, and FAQ for Catchy

5. Bunken

Bunken is a cloud tool provided by Web Rider Inc., specialized in Japanese text proofreading and polishing. It combines checking functions based on proprietary rules with "AI Assist" features like AI-driven rewriting suggestions and summarization. It is accessed and used via a web browser.

• Strengths: You can check 13 proofreading items (such as typos and honorific errors) and 22 polishing items (such as redundant expressions) using proprietary rules.
• Strengths: It includes a masking feature to redact confidential information before sending it to the AI, and the Business Team plan allows automatic detection of personal information.
• Things to note: There is no free plan; it becomes paid after a 14-day free trial. Additionally, it is noted that it may not be comfortable to use on smartphones or tablets.

Pricing: Personal ¥1,650/month (1-year renewal, monthly renewal is ¥1,980. For 1 user only) / Business Team ¥2,750/user/month (1-year renewal, monthly renewal is ¥3,300) Tax included. 14-day free trial available.

Best for: Individuals who want to improve the quality of Japanese writing, and businesses or organizations that want to standardize notation rules within their teams. It is also suitable for those who want to use AI features with peace of mind when handling confidential information.

View detailed features, pricing, and FAQ for Bunken

6. Value AI Writer byGMO

Value AI Writer byGMO is an AI writing tool specialized in creating SEO articles, provided by GMO Digilock Co., Ltd. When you enter a keyword, it generates the title, heading structure, and body text in sequence. You can also post to WordPress directly from within the tool.

• Strengths: You can try it for free up to one article per month with the free plan.
• Strengths: You can choose from multiple AI models, such as GPT-4o and Claude 4.0, for generating body text.
• Strengths: You can convert generated articles to HTML and save them as drafts or post them to WordPress.
• Things to note: An article is counted once the title and headings are generated.
• Things to note: Research on keywords acquired by competitor sites is limited to the Expert plan.

Pricing: Free ¥0 (1 article/month) / Entry ¥840/month (3 articles/month) / Entry Plus ¥1,400/month (5 articles/month) / Basic ¥2,800/month (10 articles/month) / Basic Plus ¥5,480/month (20 articles/month) / Pro ¥10,780/month (50 articles/month) / Expert ¥43,780/month (400 articles/month) All prices include tax. First-time users get extra articles and characters.

Best for: Those who want to efficiently create Japanese articles with SEO in mind, or those who want to automate WordPress operations.

View detailed features, pricing, and FAQ for Value AI Writer byGMO

7. Rytr

Rytr is an AI assistant equipped with a writing feature called “Create” and “Engage,” which supports interactions and follow-ups with business partners. You can create text for 40 types of use cases, such as emails and social media posts, and it supports creation in 38 languages.

• Strengths: The free plan allows up to 10,000 characters per month, and the Lite plan offers unlimited characters for $9/month.
• Strengths: With the Chrome extension, you can request rewrites directly from input fields in Gmail, Slack, and more.
• Things to note: There is no official guidance regarding Japanese interface display or output quality.
• Things to note: The differences between higher-tier plans are mainly in the scope of Engage features, and pricing is in US dollars.

Pricing: Free (10,000 characters/month), Lite ($9/month, unlimited characters), Personal ($19/month), Pro ($49/month). A 20% discount applies with annual billing.

Best for: Those who want to create text for various use cases at a low cost, or those who want to improve work efficiency by integrating with Gmail or Slack. However, if you have high requirements for Japanese quality, we recommend comparing it with other tools.

View detailed features, pricing, and FAQ for Rytr

8. Quillbot

Quillbot is an AI writing tool that integrates features such as grammar checking, summarization, and translation, with paraphrasing at its core. It is operated as a business of Learneo, Inc. and supports paraphrasing in 23 languages, including Japanese.

• Strengths: Even with the free plan, you can try paraphrasing up to 100 words per instance and basic grammar checking.
• Strengths: It offers a rich range of usage environments, including browser extensions, Windows and macOS apps, and a Microsoft Word add-in.
• Things to note: Grammar checking, summarization, plagiarism checking, and the AI humanizer do not support Japanese.
• Things to note: Payment in Japanese yen is not possible; transactions are settled in US dollars, so card company fees may apply.

Pricing: Free / Premium $8.33/month ($99.95/year. Monthly billing is $19.95, quarterly billing is $39.95, semi-annual billing is $79.95) / Team Plan $7.50/seat/month (2–10 seats, $89.95/seat/year. 11–50 seats are $6.66, 51+ seats are equivalent to $5.83) Priced in US dollars; prices and currencies may vary by region.

Best for: Individuals who frequently create English-centric content or perform multilingual rephrasing. However, if you need Japanese grammar checking or summarization, consider using it alongside other tools.

View detailed features, pricing, and FAQ for Quillbot

9. Grammarly

Grammarly is a writing assistance tool focused on improving spelling, grammar, and tone in English text. It also includes AI-powered text generation and rewriting features. The operating company changed its name to Superhuman in October 2025, but Grammarly continues to be offered as a product name.

• Strengths: Spelling and grammar checks and tone verification are available even on the free plan. It can be used directly in places where you typically write, such as Windows, Mac, browser extensions, and Office.
• Strengths: The Pro plan allows full-sentence rewriting, plagiarism checking, and AI-generated text detection. Teams of 1 to 149 members can use it at the same price.
• Things to note: It does not support proofreading or rewriting Japanese text. Japanese is only included as a target language for inline translation in paid plans.
• Things to note: Pricing is in US dollars. There are no regional prices in Japanese yen.

Pricing: Free (100 AI prompts/month) / Pro $12/month ($144/year. Monthly billing is $30, quarterly billing is $60. 2,000 AI prompts/month, 1–149 members) / Enterprise (contact sales). Priced in US dollars. “Superhuman Pro,” which bundles Grammarly, Docs, and Go, is $12/member/month ($15/month if billed monthly)

Best for: Individuals who frequently create business documents or emails in English. It is also suitable for teams that want to create content based on a unified tone or style guide. However, it is not suitable for those who want to proofread or improve Japanese text using AI.

View detailed features, pricing, and FAQ for Grammarly

10. Sudowrite

Sudowrite is an AI writing tool specialized in fiction writing, such as novels and scripts. It can perform tasks like continuing text, adding descriptions, and brainstorming ideas. By referencing a Story Bible that compiles work information, it enables consistent text generation.

• Strengths: It offers a rich set of features specialized for creative writing, such as Write, Describe, and Rewrite.
• Strengths: The Story Bible helps manage plots and outlines, making it easier to maintain consistency across series works.
• Things to note: There is no account-level language setting. Some features may output text in English.

Pricing: Hobby & Student $10/month ($19/month if billed monthly. 225,000 credits/month) / Professional $22/month ($29/month if billed monthly. 1,000,000 credits/month) / Max $44/month ($59/month if billed monthly. 2,000,000 credits/month, unused credits roll over for up to 12 months)

Best for: Individuals who primarily want to write novels or scripts, and those who want to unify their work’s worldview using the Story Bible. It is also worth considering for those who want to use voice input via iOS or Android apps.

View detailed features, pricing, and FAQ for Sudowrite

Recommendations by Goal

The best AI writing tool depends heavily on your specific use case. First, check if the tool offers a free trial and whether it excels at creating Japanese text. Look for features that match your needs. The table below organizes common goals and recommended tools based on data.

Goal	Recommendation	Reason
Try it for free first	Catchy	No credit card required. You can use up to 10 credits for free each month.
Write Japanese SEO articles	Value AI Writer byGMO	You can generate SEO article titles, headings, and body text sequentially from keywords.
Fix typos and honorifics in Japanese	Bunken	It checks for typos and incorrect honorifics using its own rules.
Create on-brand content as a team	Jasper	You can register your brand voice and internal documents to create brand-aligned content.
Improve your English writing	Grammarly	It supports spelling, grammar, and tone improvements, as well as AI text generation.
Write novels or scripts	Sudowrite	You can continue writing or add descriptions based on your Story Bible.
Paraphrase text	Quillbot	Paraphrasing supports 23 languages, including Japanese.
Use AI while writing in Notion	Notion AI	You can request drafts, summaries, translations, and rewrites on the page. Continued use requires a Business plan (¥3,150/member/month, billed annually) or higher.
Edit Japanese text for free	DeepL Write	For free, it corrects grammar and spelling and suggests paraphrases for up to 1,500 characters per request (style and tone specifications are not available for Japanese).
Write short emails or social posts quickly	Rytr	You can choose from 40 use cases. It works in Gmail and Slack input fields via the Chrome extension (there is no official guidance regarding Japanese quality).

Note that pricing for each tool varies by plan and contract period. Also, feature depth and supported platforms differ by tool, so we recommend checking details on the official website before adopting one.

How to Choose Without Regrets

Check if the features match your goals

Different tools excel in different areas. Catchy can create ad copy and articles using over 100 purpose-specific tools. On the other hand, Sudowrite specializes in continuing novels or scripts and adding descriptions. Also, Grammarly focuses on English grammar checking and tone adjustment. First, confirm whether the tool has the features you need for your work.

Understand the scope of Japanese support

DeepL Write and Bunken are strong in Japanese proofreading and polishing, and their interfaces are available in Japanese. Jasper and Quillbot support Japanese as an output language, but some features, such as grammar checking, may not be supported. Grammarly cannot be used for Japanese sentence correction. If you use the tool frequently in Japanese, please check the scope of support in detail.

Compare pricing structures and free tiers

Value AI Writer byGMO has a free plan that lets you try it for up to one article per month. Rytr is also free to use up to 10,000 characters per month. On the other hand, Jasper and Bunken do not have free plans; you can try them via free trials (7 days for Jasper, 14 days for Bunken). Notion AI can be used continuously on Business plans and above, but it is limited to a trial version on Free and Plus plans. Choose a plan that fits your budget and usage frequency.

Check available platforms and integrations

DeepL Write works in many environments, including Word and Google Docs. Quillbot also supports browser extensions and desktop apps. Catchy is only available via web browser. Bunken assumes use on PC browsers and may not work comfortably on smartphones. Whether it integrates with the tools you usually use is also an important point.

Determine if it is for individuals or businesses

Catchy and Value AI Writer byGMO have pricing structures that are easy for individuals to start with. Jasper's Pro plan is for a single seat only; using it with multiple people requires the Business plan. Bunken's Business Team plan allows you to use dictionary sharing and confidential information masking features. Choose between individual or business options based on the number of users and security requirements.

FAQ

Q. Which AI writing tools have a free plan?

Catchy, Value AI Writer byGMO, Rytr, Quillbot, and Grammarly offer free plans. Catchy allows up to 10 credits per month, while Value AI Writer byGMO permits up to one article per month. Additionally, Rytr offers up to 10,000 characters per month, and Quillbot and Grammarly allow you to try basic features for free. DeepL Write is also available for free, with a limit of 1,500 characters per use. On the other hand, Jasper and Bunken do not have free plans; you can try them via free trials (7 days for Jasper, 14 days for Bunken). Notion AI offers only a trial version on its Free and Plus plans, while Sudowrite requires a paid plan (starting at $10/month with annual billing).

Q. Which tools are specialized in Japanese writing and proofreading?

Catchy, Bunken, and Value AI Writer byGMO have strengths in Japanese support. Catchy lets you create copy and articles using over 100 purpose-specific tools. Bunken checks for typos and keigo (polite language) and includes a masking feature to hide confidential information. Value AI Writer byGMO handles everything from creating SEO articles to posting them on WordPress. DeepL Write also supports Japanese proofreading, but you cannot specify the writing style.

Q. Which tools are best for English writing and improvement?

Grammarly, Jasper, Rytr, Quillbot, and Sudowrite can be used for creating and improving English text. Grammarly checks spelling and grammar and adjusts tone. Jasper creates marketing copy aligned with your brand voice. Rytr lets you choose from 40 use cases to generate content and offers a Chrome extension. Quillbot supports paraphrasing, summarization, and detecting AI-generated text. Sudowrite has features specialized for creative writing like novels and scripts.

Q. Which tools support collaboration among multiple users?

Notion AI, Jasper, Bunken, Value AI Writer byGMO, Quillbot, and Grammarly support team use. Notion AI allows you to use features like AI meeting notes on Business plans and above. Jasper's Business plan adds API access and no-code agent building. Bunken enables teams to share dictionaries and unify notation rules. Value AI Writer byGMO includes a writer management feature that lets you set permissions for each writer. Quillbot and Grammarly also offer paid plans based on the number of seats or members.

Q. How much do they cost?

Pricing structures vary by tool. Catchy starts at ¥3,000/month on its Starter plan, while Bunken costs ¥1,650/month (annual renewal) for Personal. Value AI Writer byGMO is available from ¥840/month on its Entry plan. Jasper’s Pro plan is $59/month (annual billing), and Grammarly’s Pro is $12/month (annual billing). Rytr’s Lite plan is $9/month, and Quillbot’s Premium is $8.33/month (annual billing). Sudowrite is available from $10/month (annual billing) on its Hobby & Student plan. Please check the official website for the latest pricing and features.

Summary

This article compared 10 AI writing tools, including Notion AI and DeepL Write. Each tool has different strengths and pricing structures, and the level of Japanese support varies. For example, Catchy and Bungyen specialize in creating and proofreading Japanese text, while Grammarly focuses on improving English.

The availability of a free plan and the cost of continued use are also important factors. Notion AI requires a Business plan or higher for continued use, whereas DeepL Write allows up to 1,500 characters per use for free. To choose the tool that fits your work, compare features and pricing.

• For creating Japanese SEO articles: Value AI Writer byGMO (end-to-end support from keyword selection to article generation)
• For checking English grammar: Grammarly (specializes in spelling and grammar improvement)
• For creative writing or novel writing: Sudowrite (writing assistance features using Story Bible)

View all AI writing tools (21 items)