OpenCat - AI Chat, Agent, MCP

Name: OpenCat - AI Chat, Agent, MCP
Rating: 4.6 (839 reviews)
Author: Early Moon, LLC

By: Early Moon, LLC App

Privacy-First Multi-Model AI

Overview

Version:

26.8.0

Last updated: 2026-08-07

Features & Capabilities

OpenCat AI is a privacy-first, multi-model AI assistant that brings AI into every workflow: chat, writing, translation, and search. It supports multiple model options (local models, API Key, Cloud subscription, and Apple Intelligence), MCP and tool calls, web search on OpenCat Cloud, system-wide translation, and rich content rendering (LaTeX, Markdown, and code highlighting). It’s cross‑platform for Mac, iPhone, and iPad, with data stored locally and synced across devices via iCloud.

Pro features unlock deeper integration: an AI Keyboard to polish or reply inside any app, access to all major models through OpenCat Cloud, BYOK with your own API Key (25+ providers), and support for system models and Apple Foundation Models. Local models run offline with Apple silicon acceleration, ensuring private, on‑device inference with no sign‑in and zero configuration for many setups.

User Growth & Download Statistics

App AI GenAI Privacy & Security Developer Tools Open Source Content

By:

Early Moon, LLC

Rating:

4.60

(839) 2 new ratings

Version:

26.8.0 Last updated: 2026-08-07

Version code:

889336501

Creation date:

2023-03-03

Compatible devices:

Size:

98.68MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-08-09

Compare stats and ranking:

Ranking

# 58,969 ▼ 44

Other rankings

#4 in openai chat keyword 53

#7 in agent keyword 62 ▲ 2

#27 in autocomplete keyword 13 ▲ 19

#32 in quillbot keyword 42 ▼ 8

#36 in openai keyword 56 ▼ 1

Upgrade to see more rankings

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Early Moon, LLC

Apple Apps Store

https://apps.apple.com/us/app/opencat-ai-chat-agent-mcp/id6445999201

Website:

https://opencat.app

User Reviews

Users praise OpenCat for cross‑device sync, flexible backends (own API keys or cloud), and support for self‑hosted LLMs with a clean UI. However, repeated issues include inability to customize the server URL, flaky local model support after updates, poor export/copy options and limited documentation, plus UI lag and incomplete features (MCP, search). Overall sentiment is mixed: strong feature set but significant stability and usability drawbacks.

Pros

Cross‑device history sync: Chat histories can be continued across iOS and macOS devices.
Flexible backend: use your own API keys or the cloud service.
Self‑hosted/local LLM support: can point the app to your own server for faster, private runs.
Wide model coverage with a clean, efficient UI.

Cons

Inability to customize the server URL is repeatedly cited as a major limitation.
Local/self-hosted model support is inconsistent or disabled after updates; only cloud models selectable in some versions.
No export/save options for conversations and poor copy/export workflow; lack of documentation.
UI performance issues: lag when long inputs, chat window shakes with long outputs, occasional unresponsiveness and sync problems.
Incomplete feature set: MCP support/streaming and search options are not fully implemented or configurable; some features appear unfinished.

Recent reviews

Every model returns does not support streaming now

by He*****, 2026-06-16

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！