docViewer vs privateSLM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
docViewer
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"docViewer" is a “all in one” program to display any type of document, images, audio files and video files. With "docViewer" you can store an infinite number of documents in your portable device and you can visualize / share / print them whenever you want, also in offline mode. Compatible documents: - iWork documents (Pages, Numbers, Keynote) - Microsoft Office documents (Office ‘97 and newer) - Rich Text Format (RTF) documents - PDF files - Text files (TXT) documents - Comma-separated value (csv) files - Images - Audio files (normal playback or with HiFi) - Video files (normal play, with external televisions, with video projectors) - Zip files (view contents) Archive (Flash Drive feature): - Local archive of documents: you can save all the documents that you want in the internal memory of the device, take them with you and view them offline (no internet connection is required) Typical usage: - import documents (e.g. email attachments, pdf, doc, pages, etc...) - save them to the device's memory (internal storage - once imported, an internet connection is not required to work on the document) - view them - edit them (add freehand text, text written with the keyboard, drawings, highlight, underline, delete, color, review, correct, etc...) - search for words in the document - save the modified document to files - print - share or forward by email Rename documents: - Tap and hold your finger on the document file name for 1.5 seconds to rename the document Documents Sharing: - "ITunes File Sharing" - "Open In" - "Importing documents”: from email attachments, from Safari, from other installed applications, from Dropbox, iCloud Drive, AirDrop, etc... - "Exporting documents”: with other applications installed, Dropbox, iCloud Drive, AirDrop, etc... - "Publishing documents”: on Facebook and Twitter - "Sending documents”: with an email, iMessage, WhatsApp, etc… - Copy / Paste Document print: - AirPrint - Export to PDF file format (zoom with two fingers the print preview and share the generated PDF using the share button) Document visualization: - Viewing documents in full screen (Portrait, Landscape) - Zoom (pinching the screen with two fingers) - Pan (by dragging a finger across the screen) - Zoom IN/OUT automatically (double tap) - Horizontal swipe (quickly) to move from one document / song / video / photo to another one Vocal reading of documents: - Using Siri Dictionary: - Definition of terms highlighted in the document by using the multilingual dictionary Application Type: - UNIVERSAL APP (you pay only once and you can run on all your devices)
privateSLM
This AI chat application runs entirely on your device, ensuring complete privacy with no cloud reliance or data leaving your phone. It offers smart engine integration and robust chat management features for seamless, offline use.
- 100% on-device AI processing
- No account, cloud, or data sharing
- Automatic fastest engine selection
- Offline and airplane mode compatible
- Full chat history management
- Voice input and output
- Customizable system prompts
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privateSLM — private AI that runs on your device. Free. Chat with an AI that never sends a word to the cloud. privateSLM runs language models directly on your iPhone, iPad and Mac — no account, no server, no internet needed. On devices with Apple Intelligence it answers on the first tap, with nothing to download. On any other device, pick a free model and you are chatting in a minute. ASK YOUR DOCUMENTS — OFFLINE Attach a PDF, a Word file or a photo of a page and ask about it: • "Summarize this contract" • "What is the notice period?" • "Explain this letter in simple terms" The file is read on your device — scanned pages too, with on-device text recognition — and is never uploaded. Long documents work as well: privateSLM finds the passages that answer your question, or reads the whole document part by part for a summary. FREE, WITH NO CATCH • Chat with Apple Intelligence or free general models (Llama, Qwen, Gemma, Phi) • Documents: PDF, Word, text files and scans • Voice in and voice out • Chat history, Siri and Shortcuts, a Home Screen widget • No ads. No account. No tracking. EXPERT MODEL PACKS — PAY ONCE Want a specialist? Add a pack with a one-time purchase. No subscription, ever. • Tech Pack — coding, SQL, math and security models • Business Pack — law, finance and translation models • Health Pack — medical and mental-health models • All Packs — everything above, and every pack added later Purchases work with Family Sharing. Bought privateSLM when it was a paid app? Every pack is already yours, automatically. 100% PRIVATE Everything runs on-device. No sign-up, no analytics, no ads. Your chats and documents are stored only on your device. It works in airplane mode. BUILT TO ACTUALLY USE • Matched to your device — privateSLM checks your device's memory, on-device, and shows the models that will run well. • Resumable downloads that survive a dropped connection. • Speak your question, hear the answer. • Stop, copy or regenerate any reply. • Translate the chat into your language, on-device (iOS 18 and later). • Tune the system prompt and sampling. • Siri and Shortcuts: Ask, Summarize, Rephrase, Translate. PERFECT FOR • Contracts, letters and reports you would rather not upload anywhere • Flights and travel with no connection • When another AI's credits have run out • Anyone who wants answers that never leave the device Runs on-device with llama.cpp and Apple Intelligence. Note: Apple Intelligence requires a supported device and iOS 26 or later; on other devices the first answer needs a model download. The Medical, Legal and Finance models are AI assistants for general information only — not professional medical, legal or financial advice. Larger 7B expert models run best on recent devices with 8 GB or more of memory.
Screenshots
Verdict
The clearest difference is price: privateSLM at Free against docViewer's $0.99. privateSLM also leads on update cadence (every 8 days vs every 38 months). docViewer's advantage is iOS requirement (14.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
privateSLM is free to download; docViewer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
docViewer ships an update every 38 months, privateSLM every 8 days. The most recent releases landed on October 9, 2026 and October 20, 2026 respectively.
| Parameter | docViewer | privateSLM |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 38 months | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Gianluca Natalini | Vasily Lukin |
In-app purchases
docViewer
No in-app purchases
privateSLM
No in-app purchases









