Developer builds offline Android AI app that runs entirely on-device without cloud

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A developer created Orb, an Android app that runs AI models locally on-device, eliminating the need for a cloud backend or internet connection after an initial one-time model download of 1–3 GB. The app supports chat, image and document processing, speech-to-text, and text-to-speech, all functioning without an account, subscription, or ads. Building Orb surfaced key challenges around large model downloads, which the developer treats as a critical onboarding step requiring clear communication about file size, storage, and Wi-Fi requirements. Hardware fragmentation on Android also posed difficulties, as performance varies widely across devices depending on GPU, NPU, or CPU availability. The developer positions Orb not as a ChatGPT replacement but as a privacy-focused tool for use cases where sending data to remote servers is undesirable or impossible.

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