esper – Offline & Private AI

关于这款应用

esper – Offline & Private AI is a personal AI chat application designed for privacy and flexibility on iOS. It allows users to download and run open-source language models like Qwen, Gemma, and DeepSeek directly on their device, ensuring conversations remain offline and untracked. The app supports a “Bring Your Own Key” (BYOK) model, enabling access to premium providers such as ChatGPT, Claude, and Gemini through user-supplied API keys. Key capabilities include multimodal input for images and PDFs, local Retrieval-Augmented Generation (RAG) for organizing private document collections, and native web search integration. Additional features include branching conversations, custom GPT creation, mid-conversation model swapping, and iCloud sync for Pro subscribers. The app also offers local image generation via Stable Diffusion and voice synthesis options in its paid tier, all while maintaining a strict no-analytics policy.