LocalRAG! vs ChatPDF: Free Alternative with 25 Formats Including PDF & EPUB
If you’re looking for a way to chat with PDFs using AI, it helps to compare both the supported files and the data flow. This page explains LocalRAG!’s mobile, on-device workflow alongside ChatPDF so you can choose the workflow that fits your documents.
On-device privacyWhat is ChatPDF?
ChatPDF is a document-question-answering service. Its supported formats, availability, pricing, and data-handling terms can change, so review its current documentation when evaluating it for a particular workflow.
What is LocalRAG!?
LocalRAG! is a native mobile app for iPhone, iPad, and Android. It extracts, indexes, and searches original files on the device.
When you ask a question, LocalRAG! retrieves relevant passages locally. With Local AI selected, document content, questions, and answers remain on-device and the workflow can run offline. With Claude selected, the app sends your question and retrieved excerpts to the API; the original file is not uploaded.
LocalRAG! supports 25 formats across documents, images, audio, and video, including PDF, EPUB, Office files, scanned PDFs with OCR, and images via on-device OCR.
Why does privacy matter for document AI?
A useful document-AI privacy question is what stays on your device and what is sent to an AI provider. LocalRAG! keeps the original file, extraction, index, and retrieval on-device.
Choose Local AI when you want answer generation to stay on-device as well. Choose Claude when you want a cloud model: the app sends the question and the retrieved excerpts needed for the answer, not the original file. Review the Privacy Policy for the separate anonymous usage statistics the app sends.
Feature-by-feature comparison
| Feature | LocalRAG! | ChatPDF | Note |
|---|---|---|---|
| On-device processing | ✅ | — | Your files never leave your phone |
| PDF support | ✅ | ✅ | |
| Works fully offline | ✅ | — | Local LLM needs no internet; ChatPDF runs in the cloud |
| EPUB support | ✅ | ✅ | Both supported |
| DOCX / XLSX / PPTX / TXT / MD / CSV | ✅ | ✅ | LocalRAG!: 25 formats total |
| Scanned PDF (OCR) | ✅ | — | Built-in OCR engine |
| Source citations | ✅ | ✅ | Both provide page references |
| Native mobile app | ✅ | ✅ | Both offer iOS & Android apps |
| Bring Your Own Key | ✅ | — | Use your own API key |
| Image support (OCR) | ✅ | — | JPG, PNG, HEIC, WebP with on-device OCR |
| Sub-collections | ✅ | — | Nested folders up to 3 levels |
| Free tier | ✅ | ✅ | LocalRAG!: 5 Q/day, ChatPDF: limited |
4 reasons to switch from ChatPDF to LocalRAG!
Original files stay on-device
LocalRAG! extracts, indexes, and retrieves original files on your iPhone, iPad, or Android device. In Claude mode, only the question and retrieved excerpts are sent to the API.
Local AI can answer offline
With Local AI selected, document content, questions, and answers remain on-device. This supports an offline document-Q&A workflow after the local model is available on the device.
On-device OCR & 25 formats
LocalRAG! supports 25 formats across documents, images, audio, and video. Scanned PDFs and images can use on-device OCR.
Bring Your Own API Key
Power users can connect their own Claude API key for unlimited usage. This gives you full control over costs and removes any dependency on LocalRAG!’s servers for AI responses.
Who should switch to LocalRAG!?
- Lawyers and legal professionals — reviewing contracts and case files that must remain confidential
- Researchers and academics — working with unpublished papers and proprietary data
- Business professionals — handling internal reports, financial documents, and strategic plans
- Students — studying from textbooks, lecture notes, and research papers on the go
- Anyone concerned about privacy — who doesn’t want their personal documents on someone else’s server
Verdict
LocalRAG! is a fit when you want original-file handling, extraction, indexing, and retrieval on a mobile device; optional Local AI for offline answers; or Claude with retrieved excerpts rather than the original file. Compare current service terms and supported formats before choosing a workflow for sensitive documents.
FAQ
What is the main difference between LocalRAG! and ChatPDF?
LocalRAG! extracts, indexes, and retrieves original files on-device. With Local AI selected, answer generation is also on-device and can work offline. With Claude selected, the app sends the question and retrieved excerpts to the API, not the original file. LocalRAG! supports 25 formats across documents, images, audio, and video.
Is LocalRAG! free to use?
Yes. LocalRAG! offers a free tier with 5 questions per day — no account or credit card required. Paid plans start at $4.99/month for 30 questions/day. You can also bring your own Anthropic API key for unlimited access to all models.
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The information in this article is based on publicly available information at the time of writing. If you find any inaccuracies, please let us know. [email protected]
Try LocalRAG! Free
Free tier with 5 questions per day. No account required.