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OpenCat - AI Chat, Agent, MCP
Bring AI into every part of your workflow: chat, writing, translation, and search.
· Multiple model options — local models, API Key, Cloud subscription, Apple Intelligence
· MCP — supports MCP and tool calls
· Web search — available on OpenCat Cloud and select providers
· System-wide translation — select text in any app for instant AI translation
· Content rendering — supports LaTeX formulas, Markdown, and code highlighting
· Cross-platform — natively built for Mac, iPhone, and iPad
· Data privacy — stored locally, synced across devices via iCloud
[Pro Features]
· AI Keyboard — invoke AI right in the text field of any app to polish or reply in one step
· OpenCat Cloud subscription provides access to all major models
[A Variety of Models]
· OpenCat Cloud — fast access to leading models
· Local models — one-tap download of open-source models for offline use, accelerated by Apple silicon
· BYOK — use your own API Key, including Coding Plan
· System models — supports Apple Foundation Models
[OpenCat Cloud — Ready to Use, No Setup]
· No sign-up, zero configuration, all major models supported
· 50+ models — ChatGPT, Claude, Gemini, Grok, DeepSeek, GLM, MiniMax, Kimi, Qwen, Doubao, and more, all in one place
· Online search supported
[System-Level AI Translation]
Set OpenCat as your default translation app to translate selected text directly in Safari, Mail, Notes, and any other app. Powered by large language models, translations are natural and fluent — far superior to traditional translation engines.
[Local Models, Offline Inference]
· One-tap download — popular open-source models like Llama, Qwen, and Gemma
· Apple silicon acceleration — built on Apple's official MLX framework, fully leveraging GPU performance for fast, energy-efficient inference
· Fully offline — works without internet, conversation data never leaves your device
[Use Your Own API Key]
· 25+ providers supported — OpenAI, Claude, Gemini, DeepSeek, Kimi, Qwen, Doubao, ERNIE, and more
[Contact Us]
Email: support@dreamoon.ai
Terms of Use
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy & Third-party AI Service Privacy Policy
https://opencat.app/privacy
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Developer & User Discourse
Heudjejsuxhdndbxhd • Jun 16, 2026
★ 1
Every model returns does not support streaming now
Asland D • Jun 9, 2026
I emailed the developer suggesting they add a model reasoning effort levels setting, and he quickly implemented this optimization. Now I feel like I can't find a better custom AI assistant than this app！
iZealots • Mar 15, 2026
越做越差，Azure TTS功能至今没有解决。
失望至极！！！
失望至极！！！
风为卿扬 • Mar 13, 2026
ai对话几次后，回答会混乱，回答的是之前的代码
大猫熊熊 • Mar 2, 2026
新版本如何让模型进行联网搜索？
maven_23 • Jan 28, 2026
Please add Vietnamese to the translation section.
Max 🎲 • Jan 23, 2026
希望增加修改历史记录的功能，至少可以最后一次的对话内容。有时候模型输出不是希望的格式，目前只能一直删除一直生成直到命中，如果能修改会很方便。
Darcyjm • Jan 5, 2026
My Gemini API is only used for some translation work, and shortly after using OpenCAT, it prompted that the limit had been exceeded.
2smile^ • Dec 9, 2025
直接一个垃圾，越来越垃圾
爱opencat • Dec 4, 2025
一直在用，非常好用。更新模型也很及时。不过因为用的多，积累了很多对话内容。希望增加导出的功能，便于搜索特定内容。
Kswalker75 • Nov 2, 2025
I self host my own AI server and this app works great, you just point it to your domain/IP of your server and that’s it. I use cloud based models on my server so most are extremely fast!!
CDigby • Sep 16, 2025
After the most recent uodate, as of this review, using your local LLM with this app is impossible. No model outside the cloud platform is selectable in anyway. I can validate the providers source but I can’t then select those models. Very disappointing as I just got used to using this app.
sunflower7318784 • Aug 20, 2025
我觉得app现在输入法的主意很棒，但有点自我设限了，觉得只是一个聊天客户端的边缘功能。但我觉得如果正儿八经加入输入法功能，将是王炸
Eyue123 • Aug 11, 2025
什么时候可以支持智谱API自定义模型？现在没法用最新的GLM4.5
magnus919 • Jul 23, 2025
I run my own AI models and I was looking for an app to use across my Apple devices that would give me a ChatGPT-like experience with my own AI. The interface for this app is *almost there*.
But there are other things that look like maybe they were started awhile ago but never completed? Examples:
* MCP Servers - stdio and sse are presented in the interface. But stdio isn’t supported on Apple devices (so why even present the option in the interface?) and sse is a deprecated protocol. Streaming MCP is the way to go now but it’s not supported in this app. So technically, yes, there’s MCP. But outside of a few edge cases you can’t really use it.
* Search - There’s a search button in the chat interface but options are greyed out and written in a language I can’t read. There’s no way to configure this. So it’s another interface option that looks like maybe it was started but never finished.
We really need some tools *like* this and I really encourage the developer to see this through. Polish it up. There’s potential for greatness here, but it’s still unrealized.
But there are other things that look like maybe they were started awhile ago but never completed? Examples:
* MCP Servers - stdio and sse are presented in the interface. But stdio isn’t supported on Apple devices (so why even present the option in the interface?) and sse is a deprecated protocol. Streaming MCP is the way to go now but it’s not supported in this app. So technically, yes, there’s MCP. But outside of a few edge cases you can’t really use it.
* Search - There’s a search button in the chat interface but options are greyed out and written in a language I can’t read. There’s no way to configure this. So it’s another interface option that looks like maybe it was started but never finished.
We really need some tools *like* this and I really encourage the developer to see this through. Polish it up. There’s potential for greatness here, but it’s still unrealized.
Akar33 • Jul 9, 2025
This is a fantastic piece of software that allows you to use your own API keys (or optionally, use their cloud service). It is efficient, works well and syncs with the mobile app.
The only drawback is that it doesn’t let you upload arbitrary files for context like the regular ChatGPT or Claude apps do. I will like the developer to add support for it.
The only drawback is that it doesn’t let you upload arbitrary files for context like the regular ChatGPT or Claude apps do. I will like the developer to add support for it.
zz2118 • Jun 28, 2025
不能自定义服务器url，2.0之后输入框文本一长就卡顿、光标飘移
m00n7k • May 25, 2025
前期圈钱 不能自定义URL 吃香难看
App ReviewOr • Apr 15, 2025
I have been using this application since its launch. It was my goto when using the sea of developer API keys I was testing in my own projects. Sadly, the app is missing several key features with several others which I consider half baked. There is no documentation, no ability to save or export (you have to copy each side of the chat one by one), the prompt library is hardly functional, offers a subscription that’s over ridden by the presence of an API key… all in all I find myself reaching for anything but OpenCat..
stevierein • Feb 27, 2025
While the documentation states that API key access is available with the Pro plan, there's no visible option in the user interface to add an API key. Instead, the system only offers cloud membership as the solution.