Fossil ID vs DuoNinja
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fossil ID
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Point your camera at a fossil or choose a photo—get an identification in seconds. Fossil ID runs entirely on your device. Your photos never leave your phone. No account required to try. WHAT YOU GET • Instant identification with confidence score • Short guide: era, distribution, features, collectibility • World map showing where each fossil is found • Save results to your favorites • Works offline after install GREAT FOR • Rock and fossil collectors • Learners and educators • Outdoor explorers and families Supported fossil types include ammonites, trilobites, petrified wood, shark teeth, coral, crinoids, fish fossils, and more. Free to try—unlock unlimited identifications with Premium. Terms of Use：https://superficial-restaurant-956.notion.site/Terms-of-Use-318f52245d5580b58947db95300d7a24?source=copy_link Privacy Policy：https://superficial-restaurant-956.notion.site/Privacy-Policy-318f52245d5580e084f5d8a223e27f05?source=copy_link
DuoNinja
Master new languages through comprehensible input and build vocabulary with interactive lessons. Enhance reading and listening fluency with authentic content like news and books. Utilize AI-powered tools and dictionaries to quickly look up words and fill knowledge gaps.
- Comprehensible input for language mastery
- Vocabulary building lessons
- Reading and listening fluency practice
- News, texts, and book content
- Flashcards for knowledge gaps
- AI-powered word lookup
- Dictionary integration
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Use comprehensible input to master any language. Build up your base vocabulary with lessons. Then focus on reading & listening fluency through news, texts and books. Use flashcards and lessons to fill the gaps. Look up any word with AI or with dictionaries. Terms of Use: https://www.duoninja.com/terms Privacy Policy: https://www.duoninja.com/privacy
Screenshots
Verdict
The clearest difference is iOS requirement: DuoNinja at 15.0 against Fossil ID's 26.2. On price, 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
Both are free to download. Fossil ID sells 1 in-app purchase, starting at $1.99 per month and DuoNinja sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.
| Parameter | Fossil ID | DuoNinja |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | — | Every 3 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.2 | 15.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 13 MB |
| Age rating | 4+ | 12+ |
| Developer | 剑炜 陈 | Mink OÜ |
In-app purchases
Fossil ID
- Monthly Pro$1.991 Month
DuoNinja
- Premium Monthly$7.991 Month
- Premium Yearly$47.901 Year
