OtterPad is a cross-platform academic literature reading and management tool with integrated AI workflows, helping researchers efficiently read, understand, and manage papers.
- 📖 Immersive PDF reading with customizable themes and typography
- 🤖 AI-powered full-text Q&A grounded in extracted text and figures
- 🌐 Document-level paragraph translation preserving formulas and code blocks
- 🔍 Multi-source literature search and metadata resolution
- 📊 Intelligent figure/table extraction and standalone viewing
| Immersive Reading | AI Full-Text Q&A |
|---|---|
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- Immersive Reading — Customizable theme colors, font sizes, highlighting and annotations
- Paragraph-Level Translation — 8 concurrent workers translating paragraph by paragraph, automatically protecting formulas / code / citation numbers
- Figure Extraction — Accurately identifies figures and tables in PDFs for standalone viewing and copying
- Full-Text Q&A — AI answers any question about the document, grounded in extracted full text and figures
- Multi-Model Support — OpenAI / Anthropic / Google / compatible APIs, switch freely
- Smart Summary — AI-generated key takeaways from papers
- Multi-Source Search — Search via DOI / PubMed / Crossref / Semantic Scholar and more
- AI Rename — Intelligent file naming based on metadata
- Collections & Tags — Custom categorization and tagging system
- Zotero Sync — Two-way sync with your Zotero library
- Cloud Backup — S3 / WebDAV cloud backup and restore
- Auto Backup — Configurable scheduled automatic backups
Download the APK for your architecture from Releases:
arm64-v8a— Most modern Android devicesarmeabi-v7a— Older 32-bit devicesx86_64— Emulators / ChromeOS
Desktop and iOS builds are planned but not yet available.
- Framework — Flutter 3.x + Dart 3.x
- State Management — Riverpod
- Routing — GoRouter
- Storage — Hive (local) + Flutter Secure Storage (credentials)
- Networking — Dio + HTTP/2
- Design Language — Material Design 3
OtterPad stands on the shoulders of these excellent open-source projects:
- PiliPlus — Third-party BiliBili client built with Flutter
- PDFMathTranslate — AI-powered PDF translation preserving full layout (EMNLP 2025)
- FlClash — Multi-platform proxy client based on ClashMeta
- Kelivo — Multi-platform LLM chat client built with Flutter
This project is licensed under GPL-3.0.