SharkToothID vs Digital Stamp Decoder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SharkToothID
Easily identify shark teeth, scallops, and other fossils found along the Carolinas and Florida coasts. This app covers the most common specimens you're likely to discover.
- Identify shark teeth
- Identify Pecten and other fossils
- Covers Carolinas and Florida coasts
- Focuses on common fossils
- Easy to use interface
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A visual guide for identifying fossil shark teeth and other fossils found along the East Coast, including the Carolinas, Georgia, and Florida. Explore detailed fossil photographs, along with images and descriptions of the extinct animals they came from. More than just shark teeth—identify fossils from fish, rays, alligators, horses, and many other prehistoric animals.
Digital Stamp Decoder
Reveal hidden images on USPS postage stamps using advanced Scrambled Indicia® technology. Originally designed for anti-counterfeiting, this app offers stamp collectors a unique way to authenticate and appreciate their collection. Explore the innovative world of philately with this modern collector's tool.
- Reveal hidden stamp images
- Utilizes Scrambled Indicia® technology
- Authenticates USPS postage stamps
- Aids stamp collectors and philatelists
- Showcase stamp collection
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Uncover hidden images in USPS postage stamps with the Digital Stamp Decoder! Originally developed by GSSC in partnership with USPS to protect against counterfeiting, this app brings the innovative Scrambled Indicia® technology to your smartphone. Now, you can reveal the hidden designs in the popular Shuttle Stamp, a must-have for stamp collectors and philatelists. Download the app, showcase your collection, and enjoy a unique, modern twist on stamp authentication. Don't miss out on this innovative collector's tool!
Screenshots
Verdict
The clearest difference is price: SharkToothID at Free against Digital Stamp Decoder's $2.99. SharkToothID also leads on ratings volume (19 vs 2). Digital Stamp Decoder's advantage is rating (5.0 vs 4.3) and iOS requirement (15.6 vs 18.6). On update cadence, 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
SharkToothID is free to download; Digital Stamp Decoder costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Digital Stamp Decoder holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: SharkToothID has 19 ratings behind it against 2, so its average is the more settled of the two.
SharkToothID ships an update every 7 months, Digital Stamp Decoder every 5 months. The most recent releases landed on September 24, 2026 and June 1, 2026 respectively.
| Parameter | SharkToothID | Digital Stamp Decoder |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.3 (19 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 19 — better | 2 |
| Update frequency | Every 7 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 164 MB | 205 MB |
| Age rating | 9+ | 4+ |
| Developer | Steven Sharpe | Graphic Security Systems Corp. |
Customer experience
SharkToothID
Digital Stamp Decoder
In-app purchases
SharkToothID
No in-app purchases
Digital Stamp Decoder
No in-app purchases
Questions
Is SharkToothID free?
Is Digital Stamp Decoder free?
Which has better reviews, SharkToothID or Digital Stamp Decoder?
Do SharkToothID or Digital Stamp Decoder have ads?
Which is updated more often, SharkToothID or Digital Stamp Decoder?
Other comparisons
