A free BYOK AI chat app for iPhone. Bring your own API key from OpenAI, Anthropic Claude, Google Gemini, xAI Grok, DeepSeek, OpenRouter or any OpenAI-compatible API — no Ensor account, no Ensor server.
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Works with your own API key from
Ensor is a native iPhone app for managing and talking to your AI. Instead of starting from a blank chat and pasting the same prompt again and again, give each AI a name, a role, and a purpose. Your prompts become AI contacts you can return to anytime.
A focused, native interface designed around the way you already use your iPhone — simple, personal, and familiar.
Designed for AI on iPhone
Turn Prompts into AI Contacts.
Create dedicated AIs for writing, research, coding, translation, planning, or anything else. Each AI keeps its own personality, model, prompt, and conversations.
One Native Experience for All.
Connect directly to supported AI providers using your own API keys: OpenAI, Anthropic, Google Gemini, xAI, DeepSeek, OpenRouter, or any OpenAI-compatible endpoint. Add your key and Ensor loads the latest models from that provider.
Your Data Stays on Your iPhone. Connect Directly to Your AI Provider.
Your chats, prompts, settings, and usage history are stored on your iPhone. API keys are kept securely in Apple Keychain. When you send a message, it goes directly to the AI provider you selected. Ensor does not operate a server that receives your conversations.
Different Roles, One Chat.
Bring 2–5 AIs into the same conversation. Give each one a different role and let them respond together, in the order you choose.
Prompts, Usage, and Details — All in One Place.
Manage reusable prompts and personal instructions in one place. Set them once and use them across the AIs you choose. See the token usage each provider reports, per AI, day by day.
Ensor is a free BYOK (bring your own API key) AI chat app for iPhone. You add your own API key from OpenAI, Anthropic Claude, Google Gemini, xAI Grok, DeepSeek, OpenRouter or any OpenAI-compatible API, and each AI becomes a contact with its own name, avatar, model and system prompt.
Install Ensor from the App Store, open an AI contact, choose a provider and model, paste your API key, and send a message. The key is stored in the iPhone Keychain and requests go directly from your iPhone to that provider.
Yes. The app is free to download and use. You pay the AI provider directly for the API usage on your own key — Ensor does not charge a subscription and does not resell model access.
OpenAI, Anthropic (Claude), Google Gemini, xAI (Grok), DeepSeek, OpenRouter, and any custom OpenAI-compatible HTTPS endpoint.
No. There is no Ensor account and no Ensor cloud. Your chats, prompts, settings and usage history are stored on your iPhone.
No. Ensor does not operate a server that receives your conversations or keys. When you send a message, it goes directly from your iPhone to the AI provider you selected, which processes it under its own terms.
Yes. A group chat can hold 2 to 5 AI contacts. They reply in the order you set, each using its own model and key — useful for comparing GPT, Claude and Gemini on the same question.
Yes, for providers and models that accept them. OpenAI, Anthropic, Gemini and OpenRouter accept images and PDFs; xAI and custom OpenAI-compatible endpoints accept images; DeepSeek is text only.
Yes, on OpenAI, OpenRouter, Anthropic and Google Gemini, using each provider’s own web search tool. You can turn it off per AI contact. Providers may charge separately for search.
No. Ensor has no cloud sync. To move to a new iPhone, export your AI contacts and chats as JSON and import them on the new device. API keys are never exported, so you re-enter them.
Free · Requires iOS 17 or later · Bring your own API key
Download on theApp Store
