DeltaBook vs Paralango
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DeltaBook
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DeltaBook is a subscription-based learning app that provides unlimited access to all courses after subscribing. The app includes structured courses with chapters and lessons. Lessons contain high-quality videos and interactive quizzes. Users can also attempt challenge quizzes to test their knowledge and earn achievement badges for their progress. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Paralango
Learn languages by interacting with your environment. Take photos of objects, and the app will label them in your chosen language. Access detailed word cards with pronunciation and examples, and save vocabulary for future study.
- Photo analysis for object identification
- Object labeling in selected languages
- Word cards with pronunciation and examples
- Save scenes and words for review
- Switch between learning languages
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Paralango helps you learn languages from the world around you. Take a photo or choose one from your library. Paralango identifies common objects and labels them in your selected learning language. Tap a label to open a word card with pronunciation, definitions, and examples. Save useful scenes and words on your device for later review. Key features: - Analyze a photo from the camera or photo library - Switch between supported learning languages - Explore object labels, scene descriptions, word cards, pronunciation, and examples - Save scenes and favorite words in My World Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is iOS requirement: DeltaBook at 13.0 against Paralango's 17.0. On price, update cadence, ads and in-app purchases 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. DeltaBook sells 1 in-app purchase, starting at $11.99 per month and Paralango sells 2 in-app purchases, starting at $2.00 per month. Whichever you choose, the download price is not the number that matters.
DeltaBook ships an update weekly, Paralango every 6 days. The most recent releases landed on November 5, 2026 and October 24, 2026 respectively.
| Parameter | DeltaBook | Paralango |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Weekly | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 57 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Adam Weaver | 慧 张 |
In-app purchases
DeltaBook
- Monthly Premium Access3 Days trial$11.991 Month
Paralango
- Premium Monthly$2.001 Month
- Premium Annual$20.001 Year
