EsterAI

Personal AI Assistant

EsterAI is a personal AI assistant that keeps your conversations private and on your device. Connect your own AI provider account and start chatting — no EsterAI account, no sign-up, and nothing shared with us.

• Chat with a state-of-the-art AI model using your own API key • Generate images from a text prompt with your OpenAI key • Ask questions about documents you attach — PDF, Word and more — to summarize, extract and explain • Speak instead of type with on-device voice input, and have replies read back to you • Turn requests into action: create reminders and calendar events, build shopping lists, and set up simple daily routines • Study smarter with flashcards and multiple-choice practice generated from your own material • Keep private notes and let the assistant remember helpful context to personalize its answers

PRIVATE BY DESIGN • Your chats are stored encrypted on your device • Your API key is kept in the iOS Keychain and never leaves your device except to reach the AI provider you chose • No analytics, no tracking, no ads, and nothing sold to third parties

BRING YOUR OWN AI KEY EsterAI works with the AI provider you choose — OpenAI, Anthropic (Claude) or Google (Gemini). Add your key in Settings and you’re ready. Image generation uses your OpenAI key. Usage of your chosen provider is billed by that provider under its own terms; EsterAI does not charge for AI usage.

EsterAI is a focused, private personal tool. It does not require an account and does not collect your data.