Comparison

QuietScan vs ReadOS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

QuietScan

Features
Read full description

QuietScan turns paper documents into clean PDFs. No ads, no watermarks, no sign-in. Everything stays on your device. Scanned images, generated PDFs, and OCR text are saved locally — never uploaded. KEY FEATURES • Four scan modes: Document, Whiteboard, Photo, Business Card • On-device OCR (Japanese + English) using Apples Vision framework • Searchable PDFs you can search inside the Files app • Business card to one-tap save to Contacts • QR code reader • Add pages to existing PDFs • Read recognized text aloud • AirPrint, save pages to Photos, share via Files app • App Lock with Face ID / passcode • Sort and filter your document list, search by filename or OCR text PRIVACY BY DEFAULT • No ads • No watermarks • No account or sign-in • No analytics, no telemetry • OCR runs locally; nothing is sent to a server • PDFs live in the QuietScan folder visible in the Files app QuietScan is built for people who scan paper for work — receipts, contracts, business cards, whiteboard notes — and dont want a scanner app pushing subscriptions and ads at them. Made for iOS 17 and later.

About

ReadOS

This app is an AI-powered workspace for iPad that helps you read, research, and create. It connects your source materials and project context, allowing you to move seamlessly from understanding to creation. Features include AI summarization, knowledge mapping, and document analysis.

Highlights
  • AI-powered research agent
  • Contextual reading and note-taking
  • Knowledge mapping and visualization
  • Document, spreadsheet, and presentation creation
  • Web browsing and data analysis
  • Audio and video transcription
  • Multi-step task automation
Features
Read full description

ReadOS is an all-in-one, desktop-class AI agent workspace for iPad, built around the place serious work often begins: reading. Open a PDF, collect research, inspect evidence, create a report, analyze data, build office files, and continue the task without rebuilding context across separate apps. ReadOS keeps source materials, reading position, selections, files, and project context connected so you can move from understanding to creating. READ WITH CONTEXT • Open PDFs, EPUBs, Markdown, images, local audio and video files, and common office files. • Navigate document structure and page references when the source provides them. • Annotate PDFs, take notes, organize tabs, and export annotated documents. • Build knowledge maps and visual explanations connected to source material. RESEARCH WITH READEX Readex is the AI agent inside ReadOS. When you choose to share content with it, Readex can work with the current document, selected passages, attachments, webpage context, and files in your workspace. Use Readex to: • Summarize and compare source material. • Develop study guides, research plans, and structured notes. • Trace an answer back to relevant pages and context. • Work across multiple files while keeping the research question visible. CREATE, AUTOMATE, AND DELIVER With ReadOS Pro, Readex can help: • Create and edit documents, spreadsheets, and presentations. • Analyze data with Python and JavaScript. • Build charts, tables, interactive visualizations, and knowledge maps. • Browse the web, inspect pages, collect relevant context, and carry out browser tasks. • Transcribe and analyze local audio and video files, extract useful frames, and continue from a playback position. • Carry out multi-step and long-running tasks across available files and tools, with progress you can review and stop. FREE AND PRO ReadOS Free includes library management, local file opening and playback, PDF annotation, notes, navigation, tabs, workspaces, and annotated-PDF export. ReadOS Pro unlocks Readex and advanced AI-assisted work, including browser automation, creation and editing tools, code and data analysis, document and media understanding, and multi-step or long-running tasks. ReadOS Pro is available through Apple In-App Purchase as an auto-renewing annual subscription or a one-time lifetime purchase. ReadOS Pro also requires a supported AI provider account or compatible API connection. Provider subscriptions, usage quotas, and model or API fees are separate and are not included with ReadOS Pro. Availability and results can vary by source format, selected provider or model, network access, and permissions. Start with what you are reading. Keep the context. Build what comes next. TERMS OF USE ReadOS uses Apple's Standard Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

QuietScan4 screens
ReadOS3 screens

Verdict

The call

The clearest difference is in-app purchases: QuietScan at none against ReadOS's 2. QuietScan also leads on iOS requirement (17.0 vs 26.0). On price, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ReadOS sells 2 in-app purchases, starting at $19.99 per year. QuietScan asks for nothing beyond the download.

Scorecard2 real differences · 8 level
QuietScan versus ReadOS: the parameters behind the verdict, then further details
ParameterQuietScanReadOS
PriceFreeFree
Rating—5.0 (8 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—8 — better
Update frequency—Monthly
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better26.0
Further details — not scored
Size14 MB993 MB
Age rating4+17+
DeveloperKeisuke Ueda秀芳 王

In-app purchases

None

QuietScan

No in-app purchases

2 purchases

ReadOS

Subscriptions1
  • ReadOS Pro Annual7 Days trial$19.991 Year
One-time1
  • ReadOS Pro Lifetime$69.99

Questions

Is QuietScan free?
QuietScan is free to download, with no in-app purchases.
Is ReadOS free?
ReadOS is free to download, with in-app purchases available.
Do QuietScan or ReadOS have ads?
Neither QuietScan nor ReadOS shows ads.

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