YomiNinja

What it does

Reads text out of games, videos and images and overlays it on the original, so dictionary extensions such as 10ten or Yomichan can be used on words that would normally be locked inside a picture - the standard obstacle when studying a language from real material. A separate dictionary extension is required. It has not been updated since August 2025, accuracy drops on small or decorative type, and some games forbid overlays.

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 difficultyFor advanced users
• Command lineNot required
• API keyNot required
• Sends data onlineNo

Judged automatically from the project's own metadata. Always confirm on the official page.

YomiNinja FAQ

Is YomiNinja free?

Yes. It runs on your own machine, so there is no usage-based cost either.

Do I need to install anything or write code to use YomiNinja?

You install it like a normal desktop app. No command line involved.

Does YomiNinja work on a phone?

No. It needs a computer.

Can I use YomiNinja commercially?

The licence is GPL-3.0. Using it commercially is fine, but if you distribute something built on it you may be required to release that under the same licence. Keep it internal, or check before distributing.

How it compares

The conditions that decide whether you can actually use it, side by side.

"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.

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