BelliedMonkey Translator — bilingual translation for Safari, Chrome and Firefox
Is it free?
Yes — the extension is free and open source, with no paid tier. Google translation works out of the box with no key; AI engines use your own key and bill you at the provider's prices. Sign in and you can also claim a small free credit we pay for.
Which translation engines are supported?
Google (free, no key), plus ChatGPT (OpenAI), Claude (Anthropic), DeepSeek, GLM (Z.ai), Qwen, and Kimi using your own API key — or any OpenAI/Anthropic-compatible custom endpoint. You choose in Settings.
Where do I put my API key?
Open the app's Settings, pick your provider, and paste the key. It is stored only on your device and sent only to that provider when translating.
What can it translate?
How do I turn it on?
Enable the extension in Safari settings, then use the floating button on the page (or the in-player button on YouTube) to start translating.
Do you collect my data?
No. See the Privacy Policy. There is no server operated by us; nothing is collected.