Castor - Private AI Chat
Castor - Private AI Chat Summary
Castor - Private AI Chat is a free Android app in Productivity by 140 BIG Developer Team. Released in Jan 2026 (9 months ago). It has about 81+ installs Based on AppGoblin estimates, it reaches roughly 8.00 monthly active users . Store last updated Aug 1, 2026
Recent activity: 2.00 installs this week (4.00 over 4 weeks) showing steady growth View trends →
Castor - Private AI Chat SDKs Summary
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App Description
Private AI chat with local models, Gemini, OpenAI, voice, and vision.
Castor is a privacy-first AI chat application for Android.
**Key Features:**
* **On-device AI:** Run supported local models directly on your device with llama.cpp or LiteRT-LM.
* **Gemma support:** Use Gemma 4 E2B through the LiteRT-LM runtime with secure model delivery.
* **Multi-provider chat:** Switch between local AI, Google Gemini, and OpenAI depending on your task.
* **Vision support:** Attach images and chat about visual content with supported VLM models.
* **Voice tools:** Use Android speech recognition and text-to-speech where available.
* **Prompt templates:** Save and reuse your favorite instructions for repeated workflows.
* **Chat history:** Conversations are stored on your device so you can return to them later.
**About local models:**
* Some models require a first-time download. Wi-Fi is recommended.
* OpenCL acceleration is available on supported Adreno GPU devices.
* Local execution keeps eligible prompts and responses on your device.
Castor gives you a clean AI workspace that can move between private on-device inference and powerful cloud models.