PDF Reader vs StampId
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Reader
Transform your smartphone into a powerful PDF scanner and editor. Easily convert images and documents to PDF, or convert PDFs to other formats. Protect your files with encryption and share them securely.
- Scan documents
- Convert images to PDF
- Convert PDF to other formats
- Crop image sizes
- Share documents
- Add watermark
- File encryption
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Turbo PDF: Scanner & Editor is a highly reliable scanner application that effectively transforms your smartphone into a robust PDF scanner. This application enables seamless conversion of photos and pictures into PDF format with a simple and convenient touch function. Features of the Turbo PDF: Scanner & Editor Scan your documents, crop image sizes. Convert images to PDF format. Convert pdf to other formats. Efficient and user-friendly scanning experience with a quick and convenient interface. Share documents via social media, add watermark. File encryption to protect your privacy. By using our app you can seamlessly convert photos and documents to PDF, or convert pdf to other file formats. Turbo PDF: Scanner & Editor is the premier PDF converter that makes working with scanned documents extremely easy. Privacy Policy: https://www.turbopdftool.com/privacyPolicy.html For any feedback or queries, please contact us at mailto:turbopdf@outlook.com
StampId
Instantly identify stamps with AI by taking a photo. Access historical details, market value estimates, and organize your collection digitally. Explore fascinating stamp histories and automatically save your discoveries.
- AI stamp identification
- Market value estimation
- Digital stamp albums
- Historical stamp facts
- Automatic scan history
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StampId - Your Smart Philately Companion Whether you're a seasoned collector or just found an old album in the attic, StampId is the app for you. Just snap a picture, and our AI instantly identifies your stamp, giving you historical details and a reference market value. Key Features: - AI Stamp Identifier: Forget heavy catalogs. Take a photo and instantly know your stamp's origin, year, and topic. - Estimated Value: Wondering what it's worth? Get a quick market value estimate (for reference only). - Digital Albums: Organize your collection into custom folders. Keep track of what you own, right in your pocket. - Stories Behind the Stamps: Dive into the fascinating history of world-famous stamps with our curated facts. - Smart History: Automatically saves your last 50 scans so you never lose track of a discovery. Disclaimer: Valuations are estimates for informational purposes only and do not constitute financial or investment advice. Terms of Use: https://golden-alder-dbb.notion.site/Terms-of-Use-95489c0c3aba46819a1bd2410587aaff Privacy Policy: https://golden-alder-dbb.notion.site/Privacy-Policy-30eae49e6e8a805a9c14e21e3e327204
Screenshots
Verdict
The clearest difference is review sentiment: StampId at 100% against PDF Reader's 56%. StampId also leads on ads (none vs shown) and rating (5.0 vs 4.7). PDF Reader's advantage is in-app purchases (none vs 2) and ratings volume (4.5K vs 2). On price, update cadence 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
Both are free to download. StampId sells 2 in-app purchases, starting at $4.99 per month. PDF Reader asks for nothing beyond the download.
StampId holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: PDF Reader has 4.5K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 56% of PDF Reader's written reviews are positive against 100% of StampId's.
PDF Reader ships an update weekly, StampId fortnightly. The most recent releases landed on October 25, 2026 and October 23, 2026 respectively.
| Parameter | PDF Reader | StampId |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (4.5K ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 55.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 4.5K — better | 2 |
| Update frequency | Weekly — better | Fortnightly |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Best chart rank | #155 — better | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 69 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | SPARK TECH LIMITED | Hangzhou Climbfyre Technology Co., Ltd. |
Customer experience
PDF Reader
StampId
Bugs and requests
PDF Reader
Reported bugs
3 issues- Login issues
- Compatibility problems with newer devices
- Frequent crashes and freezes
Requested features
3 requests- More customization options
- Improved privacy controls
- Better customer support
StampId
Not enough reviews yet to summarise bugs or requests.
In-app purchases
PDF Reader
No in-app purchases
StampId
- StampId Premium Monthly$4.991 Month
- StampId Premium Yearly$29.991 Year
