Best AI for writing
A recommended ranking of AI strong at writing blogs, emails and documents, compared by language support and popularity.
OpenAI's AI chat — the default choice, leading the global AI chatbot market share by a wide margin.
Anthropic's AI chat — praised for long-form writing, coding and careful prose; share is trending up.
Google's AI chat — strong at search and Google-service integration; share is rising fast, especially in Japan.
Microsoft's assistant — its strength is integration with Windows and Office.
Source: StatCounter (market share) + each official site (features, pricing) ／ Captured: 2026-10 （provisional） ／ Reference ranking by our editors
The current month is a provisional, month-to-date figure. Month-over-month change and risers/fallers are based on the latest completed month.
How to choose an AI for writing
Popularity is a start, but the points below are where tools actually differ for this use case.
1. Natural writing in your language
With the same prompt, how natural the text reads differs by tool and by language. Try a short piece in the language you write in before choosing.
2. Consistency in long documents
For articles and reports, it helps if you can load reference files to set the context and if it handles long inputs.
3. Dedicated tools for proofreading
If you only need typo detection and consistent tone, a proofreading tool such as Grammarly can be quicker.
Features and pricing of every tool for writing
Including tools outside the ranking, this table lists the features and prices that matter for this use case.
| Tool | Japanese support | File reading | Free plan | Cheapest paid plan | Market share |
|---|---|---|---|---|---|
| ChatGPT | ○ | ○ | ○ | Go $8 | 68.4% |
| Google Gemini | ○ | ○ | ○ | Google AI Plus $4.99 | 18.5% |
| Perplexity | ○ | ○ | ○ | Pro $20 | 9.6% |
| Grok | ○ | ○ | ○ | Plus $8 | — |
| Microsoft Copilot | ○ | ○ | ○ | Microsoft 365 Premium $19.99 | 2.0% |
| Claude | ○ | ○ | ○ | Pro $20 | 1.5% |
| DeepSeek | ○ | ○ | ○ | — | <0.1% |
Dedicated writing tools compared
Besides AI chats, tools built specifically for this use case are also an option. Prices are each vendor's published list prices (USD). Where we could not confirm a USD price on the official page, we link to it instead of showing a number.
| Dedicated tool | Best at | Free plan | Cheapest paid plan |
|---|---|---|---|
| Grammarly Grammarly | Specializes in English grammar and tone checking. Does not support Japanese. | ○ | Pro (see official pricing) |
| Jasper Jasper | Specializes in marketing copy in a consistent brand voice. No free plan. | × | Pro $69/mo $59/mo billed yearly |
| Notion AI Notion | AI inside your Notion workspace. Full features start with the Business plan. | × | Business (see official pricing) |
Source: Each vendor's official pricing page ／ Captured: 2026-10-17
Prices and free tiers of dedicated tools are reference values checked on each vendor's official page on 2026-10-17. Plans change often, so check the latest official information before subscribing.
Frequently asked questions
Which AI is the best for Writing?
Which AI can I use for writing for free?
For writing, should I choose an AI chat or a dedicated tool?
What is this ranking based on?
Other rankings by use case
⚠ These rankings are reference values based on public market-share data, web-traffic estimates and editorial research, and do not represent a complete count of every user of each AI tool. Rankings change with the measurement method (web-visit share vs. market share, etc.). Always check each official site for the latest information.