MathKey vs Liquid Apollo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MathKey
Easily convert handwritten math equations into LaTeX, MathML, or image formats. This app supports Apple Pencil input and offers a remote keyboard feature to paste content directly onto your computer. Customize output colors and choose between light and dark themes.
- Handwriting to LaTeX/MathML conversion
- Handwriting to image conversion
- Remote keyboard for computer pasting
- Customizable output colors
- Dark and light themes
- Apple Pencil support
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● Write the math expression with your finger or Apple Pencil. ● MathKey will convert your handwriting to : - LaTeX/MathML expression for Pages, Numbers, Word and any LaTeX/MathML compatible app. - image for any other app that is compatible with images. ● Remote Keyboard : connect MathKey to your computer via our website and paste generated content right on your computer ! ● Pick any color for both LaTeX, MathML and image output. You can save up to 20 colors. ● When converting to an image, paste it from the pasteboard or, on an iPad, drag-and-drop it. ● MathKey is powered by MyScript © Interactive Ink state-of-the-art technology. ● Dark & Light themes. Important : - An Internet connectivity is mandatory. - Quotas may be imposed in case of abusive use. - Although MyScript © Interactive Ink technology is very reliable, results are not guaranteed. - Apple Pencil works only with compatible iPad. - MathKey is a keyboard.
Liquid Apollo
Access a wide range of AI language models, including local, open-source, and self-hosted options. This app provides a customizable client to connect with various AI services and run models privately on your device.
- Local AI model support
- Connect to OpenRouter API
- Integrate with custom backends
- Private, on-device LLM execution
- Access to diverse AI models
- Customizable AI client
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Chat with private, local AI models, connect to every open source AI, or your own locally-hosted private LLMs. Apollo is your own customizable client for accessing language models from all around the web. Local model support (powered by LEAP, a Liquid AI product): run smaller LLMs privately and securely on-device. OpenRouter support: bring an OpenRouter API key to chat with every model on the web. Just sign in by creating an account over at OpenRouter and paste it in to Apollo to access nearly every model, from open source models like Meta Llama 3, to closed source models like OpenAI’s ChatGPT-4. Custom Backend support: want ChatGPT at home? Run an LLM on your computer with tools like LM Studio or Ollama and connect to it with Apollo to host your own private ChatGPT-like mobile app for your family.
Screenshots
Verdict
The clearest difference is price: Liquid Apollo at Free against MathKey's $4.99. Liquid Apollo also leads on rating (4.5 vs 3.9) and review sentiment (68% vs 48%). MathKey's advantage is iOS requirement (14.0 vs 18.0). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Liquid Apollo is free to download; MathKey costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Liquid Apollo holds the better App Store score, 4.5 against 3.9. Both are backed by a comparable volume of ratings — 339 and 680 respectively. Written reviews point the same way: 48% of MathKey's written reviews are positive against 68% of Liquid Apollo's.
MathKey ships an update every 2 weeks, Liquid Apollo every 8 days. Both last shipped on November 12, 2026.
| Parameter | MathKey | Liquid Apollo |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 3.9 (339 ratings) | 4.5 (680 ratings) — better |
| Positive reviews | 47.8% of reviews | 67.8% of reviews — better |
| Number of ratings | 339 | 680 — better |
| Update frequency | Every 2 weeks | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 14.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 18 MB | 158 MB |
| Age rating | +4 | 12+ |
| Developer | Nicolas Dalbard | Liquid AI, Inc. |
Customer experience
MathKey
Liquid Apollo
User reviews
MathKey
From 339 App Store ratingsWhat we love
- 🚀 Typing equations is much easier
- 👍 Excellent for students and researchers
- 💡 Useful remote keyboard feature
- 🚀 Handwriting recognition is good
- 👍 Generates LaTeX and images well
Room to improve
- 🐛 Inconsistent recognition of symbols and subscripts
- 🐛 Requires internet connection, doesn't work offline
- 🐛 Generates incorrect LaTeX in some cases
- 🐛 Doesn't work well with complex equations
- 🐛 Incompatible with some apps like PowerPoint
Liquid Apollo
From 680 App Store ratingsWhat we love
- 🚀 Great app
- 🚀 Works well with OpenRouter
- 🚀 Excellent for running local models
- 🚀 Convenient one-time purchase
- 🚀 Clean and intuitive UI
Room to improve
- 🐛 Crashes frequently
- 🐛 Glitches when editing messages
- 🐛 Inconsistent message formatting
- 🐛 Slow performance with larger conversations
- 🔒 Unable to disable app transport security
Bugs and requests
MathKey
Reported bugs
5 issues- Keeps asking to check internet connection even with good connection
- Crashes when used with iPad Pro keyboard cover
- Doesn't work on iPhone, only iPad
- Doesn't recognize cursive writing well
- Generates incorrect output for some equations
Requested features
5 requests- Add shortcut or button to quickly type $$ or \mk
- Allow editing of generated LaTeX code
- Provide larger preview of handwritten equations
- Add support for matrices and other advanced math notation
- Integrate with computational engines like Wolfram Alpha
Liquid Apollo
Reported bugs
6 issues- Unable to download Liquid Models
- Deleted locally installed models
- OpenRouter support crashes the app
- Voice list doesn't load all available voices
- Backspace lag leading to unintended text deletion
Show 1 moreShow fewer
- Inconsistent behavior when using code blocks
Requested features
10 requests- Add support for more open-source models (e.g. Gemma 3)
- Implement image generation and upload functionality
- Allow scheduling of asynchronous tasks
- Integrate with Hugging Face model repository
- Provide built-in prompt library
Show 5 moreShow fewer
- Add MCP (Multimodal Conversation Protocol) support
- Enable direct OpenAI API integration
- Improve voice chat functionality
- Add option to delete all chat history
- Implement search and filtering for chat history
In-app purchases
MathKey
No in-app purchases
Liquid Apollo
No in-app purchases
Questions
Is MathKey free?
Is Liquid Apollo free?
Which has better reviews, MathKey or Liquid Apollo?
Do MathKey or Liquid Apollo have ads?
Which is updated more often, MathKey or Liquid Apollo?
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