Readr

Readr is a native Apple reading app for DRM-free EPUBs, PDFs, and Markdown that addresses a common but underserved reading behavior: asking questions mid-page without leaving the book. Its signature feature answers questions in the margin using the whole book as context, with citations back to passages. It also supports highlights and notes that compile into an article, on-device text-to-speech with reading-position sync, and bring-your-own AI using OpenAI, Anthropic, OpenRouter, ChatGPT, or local Ollama. The product is free, MIT-licensed, and explicitly private: no Readr account, no telemetry, no server between the user and their AI provider. The positioning is unusually clear, but the business model is not stated. This looks like a polished open-source/indie product, not yet an obvious revenue-generating business.