Claude API Key on iPhone — Free BYOK Chat App

Anthropic in Ensor at a glance

API	Anthropic Messages API (https://api.anthropic.com)
Web search	Anthropic web search tool
Image input	Yes
PDF input	Yes
Streaming	Yes
Models	Ensor loads the Claude models available to your key, or you can type any Claude model ID.

How to set up Anthropic on iPhone

Create an API key in Anthropic Console.
Open Ensor, go to Contacts and tap an AI’s avatar, or create a new AI.
Set Provider to Anthropic and paste your key into API Key.
Choose a model. Ensor loads the Claude models available to your key, or you can type any Claude model ID.
Tap Test Connection, save, and start chatting.

Good to know

Anthropic API usage is billed by Anthropic and is separate from a Claude.ai Pro or Max plan.
Images and PDFs are sent in Claude’s native format.
Requests go directly from your iPhone to Anthropic. There is no Ensor server in between.

Use Claude alongside other models

Every AI contact in Ensor has its own provider and key, so you can keep Claude next to other models and even put them in the same group chat. Other providers:

Frequently asked questions

Can I use the Claude API on iPhone?

Yes. Add your Anthropic API key to an AI contact in Ensor, choose a Claude model, and start chatting. Ensor calls the Anthropic Messages API directly from your iPhone.

Is Ensor free to use with Claude?

Yes. Ensor is free. Your Anthropic account bills you for the API usage on your key.

Where is my Anthropic API key stored?

In the iPhone Keychain, set to this device only. It is never stored in the app database, never exported and never sent anywhere except the provider’s API.

Use your Anthropic API key on iPhone