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July 2026
Free tier available
Data & diagrams
What we checked ourselves
Not copied from the project's own blurb. These are things we opened and verified, with the date.
- 11 Sept 2026We checked that the link to the project still resolves.
- 20 Aug 2026We read the official terms of service to check commercial use: allowed with conditions.
Where this sits among the 35 tools we list in Data & diagrams
- Works without using a terminal24 of 35
- No API key required20 of 35
- Runs on a phone alone16 of 35
- Sends your input to the provider6 that do not →
Only 15 of the 35 meet all of the conditions above.
Counted from our own checks: every tool we list is examined against the same criteria.
What it does
Turns your writing into editable infographics, flowcharts and visuals for slides and posts.
Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.
Screenshots & visuals
Before you start
- Setup difficultyEasy to start
- Command lineNot required
- API keyNot required
- Sends data onlineYes
Judged automatically from the project's own metadata. Always confirm on the official page.
Napkin AI FAQ
- Do I need to install anything or write code to use Napkin AI?
- No install needed — it runs in the browser.
- Does Napkin AI work on a phone?
- Yes, it works on a phone.
- Can I use Napkin AI commercially?
- Only under conditions. The page shows 商用サービス, but the actual terms — the AI model this page runs, or the provider's own terms — attach restrictions. Check the provider's terms before using it at work.
How it compares
The conditions that decide whether you can actually use it, side by side.
| Tool | Command line | API key | Sends data out | Phone | Commercial use |
|---|---|---|---|---|---|
| Napkin AI (this page) | Not needed | Not needed | Yes | Yes | With conditions |
| ml-visuals | Not needed | Not needed | Yes | No | Yes |
| mermaid | Not needed | Not needed | No | No | Yes |
| next-ai-draw-io | Not needed | Required | Yes | No | Yes |
"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.