Open Source Android OCR Apps

OSS Document Scanner is a free, open-source mobile application designed for scanning, organizing, and exporting physical documents. It transforms smartphone camera images into digital documents using automatic edge detection and perspective correction. Users can adjust scanned pages through cropping, rotation, and image enhancement filters. Its integrated optical character recognition extracts searchable text from scanned documents. The software supports multipage PDFs with optional OCR text layers. Documents can be organized into folders and shared or exported as needed. Optional synchronization and backup capabilities help users maintain their collections across devices. Available for Android and iOS, OSS Document Scanner processes documents locally and includes no advertising or tracking.

Screen Translator is a free, open-source Android application that translates on-screen text and video dialogue without requiring root access. It is designed for games, visual novels, manga, and other applications containing foreign-language content. Its floating controls capture screen content and display translations directly over the original text. Users can choose between local and cloud-based OCR engines, including ML Kit and PaddleOCR. Translation options include online services, large language models, and downloadable offline models. The application supports automatic screen translation, selected text regions, gesture shortcuts, and configurable translation presets. Video translation generates bilingual subtitles from recognized audio on supported Android devices. Additional tools include text-to-speech, terminology dictionaries, saved translations, and batch image processing.

RME: Private PDF Scanner is a free, open-source Android scanner built around privacy, local processing and document ownership. Scan documents, import PDFs and images, recognize text on-device, search your library and create searchable PDFs without uploading documents to an RME server. Key features: • Multi-page scanning • Multilingual on-device OCR • OCR review and correction • Full-text document search • Searchable PDFs • Merge, split and extract PDF pages • Share-Safe copies with blackout redaction and watermarks • Fit PDFs to upload-size limits • Two-sided ID/card copy • Folders, backup/restore and app lock Privacy by design: • No account required • No ads or tracking • No RME cloud backend • No INTERNET or ACCESS_NETWORK_STATE permission requested by the app Licensed under Apache 2.0. Available on Google Play and GitHub.

OCR Manga Reader is a free and open source Android app that allows you to quickly OCR and lookup Japanese words in real-time. It does not have ads or telemetry/spyware and does not require an Internet connection. Supports both EDICT and EPWING dictionaries. Requires Android 4.0 (Ice Cream Sandwich) or higher. See http://ocrmangareaderforandroid.sourceforge.net/ for details.

bitfarm-Archiv is a powerful Document Management (DMS), Enterprise Content Management (ECM) and Knowledge Management System (KMS) with Workflow Components. Help us! As we live in the internet age, the best thing, you can help, is to write a short statement about your scenario and your use of the DMS, along with your experiences and put it on your own website or in a blog or forum. It would help us best, if you can also add a hyperlink to our site http://www.bitfarm-archiv.com. By this you help the software to gain a better presence in the web which helps distribute it. This, however, will allow us to acquire more enterprise customers which gives us more resources, e.g. for further development of the GPL version.

LynxSight mobile is an android application that serves as OCR assistant. Application scans pictures taken by camera for text and reads it to user. LynxSight mobile is designed for use by visually impaired people. It contains voice assistant, voice commands and simple UI to make using easier.

Mitzuli is an open source translator app for Android featuring a full offline mode, voice input (ASR), camera input (OCR), voice output (TTS), and more!

PlayTranslate is an open-source Android application for real-time screen translation and language learning. It translates text from games, visual novels, manga, and other applications without interrupting the experience. Users can translate captured screens with one tap or enable automatic translation as dialogue changes. The application recognizes 26 source languages and supports translation into 59 languages. Offline OCR, dictionary lookups, and optional translation models enable usage without internet access. A floating lens provides word definitions, while furigana and pinyin overlays assist with reading. Integration with AnkiDroid and Yomitan helps users build vocabulary through interactive learning. It also supports text-to-speech, camera translation, customizable hotkeys, and dual-screen devices.

TNN, a high-performance, lightweight neural network inference framework open sourced by Tencent Youtu Lab. It also has many outstanding advantages such as cross-platform, high performance, model compression, and code tailoring. The TNN framework further strengthens the support and performance optimization of mobile devices on the basis of the original Rapidnet and ncnn frameworks. At the same time, it refers to the high performance and good scalability characteristics of the industry's mainstream open source frameworks, and expands the support for X86 and NV GPUs. On the mobile phone, TNN has been used by many applications such as mobile QQ, weishi, and Pitu. As a basic acceleration framework for Tencent Cloud AI, TNN has provided acceleration support for the implementation of many businesses. Everyone is welcome to participate in the collaborative construction to promote the further improvement of the TNN inference framework.

nunn is a collection of ML algorithms and related examples written in modern C++17.