Lumen

Lumen is an offline Android photo gallery app that finds pictures by description, reads image text, and groups faces.

Lumen is a private smart gallery application designed for Android devices. It searches photos and videos using text descriptions, extracts text from images and videos, and groups recognized faces into people. The application operates locally on the phone's GPU or processor using models like SigLIP 2, CLIP, PP-OCRv6, YuNet, and SFace. It indexes libraries overnight or while charging to maintain privacy. Lumen also provides metadata details, offline video subtitles, and encrypted hidden storage. It requires Android 11 or higher and is distributed as an open-source project under the Apache 2.0 license.

Lumen at a glance

Best for: Software engineer, Designer
Runs on: Android
Pricing: Free and open source
Released: October 2026
Category: AI productivity tool
Website: lumen-photos.app

Key features

Smart photo search by description
Live text selection in photos and videos
Face grouping for people identification
Offline video subtitle generation
Encrypted hidden photo storage
Exif details and map locations
Overnight background indexing

Use it for

Finding pictures by typing descriptions
Copying text from screenshots and receipts
Organizing and naming people in photos
Generating offline subtitles for videos

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