Inki vs Lex
Two languages, one workspace.
Lex is built around the revision pass: line-level suggestions, Ask Lex, and Style Guides generated from your own writing. Inki keeps notes, drafts, and the AI assistant in a single workspace, and writes natively in Japanese and English.
The short answer
Both tools start from the same idea: AI belongs inside the document, not in a separate chat window. The difference is scope. Lex concentrates on revising English prose, with line-level suggestions, an Ask Lex chat, and Style Guides it builds from samples you provide. Inki is a workspace where notes, drafts, and the assistant sit together, and it writes natively in Japanese and English. If polishing English is most of your work, Lex is a strong choice. If you draft in two languages, or want your notes next to the draft, Inki fits better.
Inki vs Lex
Compared as AI-native document editors
| Inki | Lex | |
|---|---|---|
| Core focus | Drafting, editing, and organizing in one workspace | Collaborative documents with AI editing, centered on revision |
| Inline editing | Select a passage, describe the change, accept or dismiss the result | Line-level highlighted suggestions, plus the Ask Lex chat |
| Writing in Japanese | Native, including business email and keigo | Japanese support is not documented on Lex's site |
| Notes and documents | Notes, references, and drafts connected as one project | Documents organized in folders |
| Long-document review | One click checks pacing, clarity, and consistency, with line-by-line suggestions | Document-level AI feedback, version history, and change tracking |
| Style guidelines from samples | Not available | Style Guides generated from articles, PDFs, or URLs, multiple per account |
| AI models | Seven models from OpenAI, Anthropic, Google, and Moonshot, plus Auto. Switch per task | Multiple frontier models from OpenAI and Anthropic on the paid plan |
| Real-time collaboration | Not available | Sharing and co-editing, included on the free plan |
| Mobile | Works in mobile browsers, no native app yet | iOS app (Lex Writer) |
| Training on your writing | Your input is not used to train external models | States that your writing is not used for model training |
| Pricing | Free plan available, paid plans from $14/mo billed annually ($20 month to month) | Free plan includes sharing and collaboration. Pro $14.99/mo billed annually, $24.99 month to month |
Drafting, editing, and organizing in one workspace
Collaborative documents with AI editing, centered on revision
Select a passage, describe the change, accept or dismiss the result
Line-level highlighted suggestions, plus the Ask Lex chat
Native, including business email and keigo
Japanese support is not documented on Lex's site
Notes, references, and drafts connected as one project
Documents organized in folders
One click checks pacing, clarity, and consistency, with line-by-line suggestions
Document-level AI feedback, version history, and change tracking
Not available
Style Guides generated from articles, PDFs, or URLs, multiple per account
Seven models from OpenAI, Anthropic, Google, and Moonshot, plus Auto. Switch per task
Multiple frontier models from OpenAI and Anthropic on the paid plan
Not available
Sharing and co-editing, included on the free plan
Works in mobile browsers, no native app yet
iOS app (Lex Writer)
Your input is not used to train external models
States that your writing is not used for model training
Free plan available, paid plans from $14/mo billed annually ($20 month to month)
Free plan includes sharing and collaboration. Pro $14.99/mo billed annually, $24.99 month to month
Pricing and features as of August 19, 2026
Choose Inki if
- You write in both Japanese and English and want one editor for both, including business email and keigo
- You want notes, references, and the draft open in the same workspace instead of scattered across documents
- You want to pick the model per task from GPT, Claude, Gemini, and Kimi, or leave it on Auto
- You want AI-sounding phrasing stripped out in one pass before you send or publish
- You want structural feedback on a long draft: pacing, clarity, and consistency, with line-by-line suggestions you accept or dismiss
- You want editing that starts from your own draft, where every change is yours to keep or discard
Choose Lex if
- Revision is where you spend most of your time, and you want a tool designed around that pass rather than around drafting
- You want line-level suggestions and a chat you can ask about the whole document, side by side
- You want style guidelines generated automatically from your own articles, PDFs, or URLs, and you want more than one of them
- You share drafts and edit with other people: sharing and collaboration are included on the free plan
- You want a clear published position that your writing is not used to train models
- You write and revise on an iPhone, where Lex has a native app
Who Inki isn't for
- You need several people editing the same document at the same time
- You want a native mobile app today. Inki runs in mobile browsers, with no native app yet
- You want reusable style guidelines built from writing samples and applied across documents
- You mainly want a checker that overlays Gmail, Word, or Google Docs rather than a place to write
Draft with context,
not copy-paste.
Lex organizes documents in folders and is built around revising the one in front of you.
In Inki the project is the context: notes, references, and earlier sections feed the AI before it writes a word.
Two languages,
one pass.
Both tools keep the AI inside the document. Inki writes and edits natively in Japanese and English, so a bilingual project stays in one editor.
Select any passage and refine it: tighten phrasing, shift tone, or smooth transitions, with every change waiting for you to accept it.
A second reader
that never gets tired.
Lex offers document-level feedback with version history and change tracking. Inki runs the same kind of pass in Japanese as well as English.
One click checks pacing, clarity, and consistency across your entire project, with line-by-line suggestions you can accept or dismiss.