The free AI tutor that lives on every web page
Select any text to get an instant, undergraduate-level explanation. Mouse Sprite spots when you stall and offers a hand — and keeps 100% of your learning history on your own device.
Works on Chrome, Edge & Brave · English & 简体中文 · No account required
An AI study companion, not just another chatbot
Most AI sidebars charge a monthly fee and route your data through their servers. Mouse Sprite is free, runs on your own API key, and never uploads a thing.
Drag-to-explain
Highlight any word, sentence or formula on any page and click Explain. Get a clear explanation, context relation, summary and related concepts in seconds.
Proactive stall detection
When you pause on a page longer than your threshold, the sprite gently offers to look up what might be confusing — help before you even ask.
100% local & private
Every interaction is stored in your browser. No tracking, no cloud, no account. Your study history is yours alone.
Bring your own key
Use OpenAI, DeepSeek, Qwen/DashScope, or any OpenAI-compatible endpoint. Pay only your provider's token cost — zero markup.
Runs fully offline
Point it at Ollama or LM Studio to run a local model. The AI and your data never leave your machine.
Smart review suggestions
Concepts you ask about repeatedly surface as personalised review prompts, turning passive browsing into spaced study.
From confused to clear in four steps
Set it up once in under two minutes, then study anywhere on the web.
Install
Add Mouse Sprite to Chrome from the Web Store — free, no sign-up.
Paste your key
Drop in any OpenAI-compatible API key, or pick a local Ollama / LM Studio endpoint.
Browse & study
The 🦉 sprite floats bottom-right on every page. Select text or just read.
Learn & review
Get instant explanations and personalised review suggestions from your own history.
How Mouse Sprite compares
Built for students and self-learners who care about cost and privacy.
| Capability | Mouse Sprite | Typical AI sidebar |
|---|---|---|
| Price | Free (your own key) | $10–20 / month |
| Data location | 100% local | Vendor cloud |
| Token markup | None | Bundled / marked up |
| Proactive help (stall detection) | Yes | No |
| Local LLM (Ollama / LM Studio) | Yes | Rarely |
| Account required | No | Yes |
| Review suggestions from your history | Yes | No |
Frequently asked questions
Is Mouse Sprite free?
Yes — completely free, no subscription. You bring your own OpenAI-compatible API key and pay only the underlying token cost to your provider. Run a local model with Ollama or LM Studio and it costs nothing at all.
Does Mouse Sprite upload my data?
No. All history and learning records live in your browser via chrome.storage. Queries go straight from your browser to the AI endpoint you choose. There is no Mouse Sprite server.
Which AI models are supported?
Any OpenAI-protocol endpoint: OpenAI (GPT-4o / GPT-4o-mini), DeepSeek, Aliyun DashScope (Qwen), plus local models via Ollama and LM Studio.
How is it different from MaxAI, Sider or Monica?
Mouse Sprite is purpose-built for learning rather than general chat. It is free (your own key, no markup), keeps 100% of data local, proactively offers help when it detects you have stalled, and turns your study history into review suggestions.
Can I use it completely offline?
Yes. Point it at Ollama or LM Studio and both the model and your data stay on your machine.
Which browsers does it work on?
Any Chromium browser — Chrome, Edge and Brave. The interface ships in English and Simplified Chinese and follows your browser language automatically.
Start learning smarter — free
Add Mouse Sprite to your browser and turn every page into a tutor.
Add to Chrome — Free