CorePath 9 vs DeltaBook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CorePath 9
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CorePath 9 is a study studio built around Guided Paths (Subject → Topic → Session). Each session presents one focused task—reorder steps, spot an incorrect line, match terms, check units, or write a short justification—followed by an explanation of why the answer works and why a common alternative fails. Every session requires a saved PathNote (versioned v1/v2/…), and incorrect attempts create MistakeCards that shape Revision Mode focus sets and Studio Runs.
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/
Screenshots
Verdict
The clearest difference is in-app purchases: CorePath 9 at none against DeltaBook's 1. On price, update cadence, 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
Both are free to download. DeltaBook sells 1 in-app purchase, starting at $11.99 per month. CorePath 9 asks for nothing beyond the download.
CorePath 9 ships an update every 9 days, DeltaBook weekly. The most recent releases landed on October 1, 2026 and October 17, 2026 respectively.
| Parameter | CorePath 9 | DeltaBook |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 28 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Nhat Huy Dang Huu | Adam Weaver |
In-app purchases
CorePath 9
No in-app purchases
DeltaBook
- Monthly Premium Access3 Days trial$11.991 Month
