Side by side
| Ensor | ChatGPT app | |
|---|---|---|
| How you pay | Free app. You pay each provider for the API usage on your own key. | Free tier with limits, plus paid ChatGPT plans. |
| Models | OpenAI, Claude, Gemini, Grok, DeepSeek, OpenRouter and any OpenAI-compatible API. | OpenAI models. |
| Account | No Ensor account. You only need an API key from the provider you use. | An OpenAI account. |
| Where chats live | On your iPhone. No Ensor cloud. | In your OpenAI account, synced across devices. |
| Several AIs in one chat | Yes — 2 to 5 AI contacts, each with its own model and key. | No — OpenAI models only. |
| Custom assistants | Every AI is a contact with its own name, avatar, model, key and system prompt. | Custom instructions, GPTs and Projects. |
| Platforms | iPhone (iOS 17 or later). | iPhone, Android, web and desktop. |
Official app details summarized as of publication; check OpenAI’s site for current plans and features.
Choose Ensor if
- You want to pay per API usage instead of a ChatGPT plan.
- You want models from several companies — OpenAI, Claude, Gemini, Grok, DeepSeek, OpenRouter — in one app.
- You want each assistant saved as its own AI contact, with its own prompt and model.
- You want several AIs answering in the same chat.
- You want no account and chats that stay on your iPhone.
Choose the ChatGPT app if
- You want voice conversations, cloud chat history and the same chats on every device.
- You prefer one flat monthly plan to pay-per-use API billing.
- You only need OpenAI models.
Use both
You can keep the official app and add Ensor for API access. API billing is separate from ChatGPT plans, so a OpenAI API key works in Ensor whether or not you subscribe. Learnhow to use your own API key on iPhone.