CRock vs 100 Dev Mistakes
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
CRock
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Still hitting the 'Stop' button and falling back asleep? Itβs time to break that habit. With CRock, the only way to silence your alarm is to physically shake your phone and shatter the stone inside. The noise wonβt stop until the rock is completely crushed! Key Features - Intensity Sensing: A gentle nudge won't work. You have to shake it with power to break the stone. - Dynamic Shatter Effects: Experience the satisfaction of realistic debris and powder animations. - Lock Screen Widgets: Access your alarm and track your progress instantly from your lock screen. Perfect For: - People who reflexively turn off alarms and go back to sleep. - Heavy sleepers who need a physical mission to wake up their brain. Your day starts when the stone breaks. Are you ready to CRock?
100 Dev Mistakes
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Know the mistakes before you make them. 100 Dev Mistakes is a growth checklist that covers the 100 mistakes junior developers make most, so you can grow faster and stop repeating the same errors. The mistakes are organized into 10 categories: coding habits, debugging and problem solving, version control and collaboration, design and architecture, testing and quality, learning and growth, communication, infrastructure and deployment, security and privacy, and performance and optimization. Each one is explained in three parts: what happens, what to do, and what you learn from it. Check off the mistakes you have experienced, then answer the reflection questions for each one. With 400 questions in total, the reflection journal turns a quick read into real understanding. You can follow your progress by category and overall across all 100 mistakes, and bookmark anything you want to revisit. Your data syncs through iCloud (CloudKit) across iPhone, iPad, and Mac, so you can pick up wherever you left off. The app collects no personal information, and there are no analytics and no ads. Try the first 30 mistakes (3 categories) for free. Upgrade to PRO to unlock all 100. PRO is available as a monthly or yearly subscription, with the yearly plan saving up to 50% compared to monthly, or as a one-time lifetime purchase. Monthly and yearly subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. You can manage or cancel your subscription anytime in your Apple ID settings. Don't wait to learn it the hard way. Know the mistakes early, learn from them, and grow faster as a developer. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://m1zz.github.io/JuniorDevMistakes/en/privacy.html
Screenshots
Verdict
The clearest difference is in-app purchases: CRock at none against 100 Dev Mistakes's 3. CRock also leads on iOS requirement (17.6 vs 26.0). On price, update cadence, ads and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. 100 Dev Mistakes sells 3 in-app purchases, starting at $2.99 per month. CRock asks for nothing beyond the download.
CRock ships an update every 3 months, 100 Dev Mistakes every 2 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.
| Parameter | CRock | 100 Dev Mistakes |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 2 months β better |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Devices | iPhone | iPhone, iPad β better |
| Requires iOS | 17.6 β better | 26.0 |
| Further details β not scored | ||
| Size | 187 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | hyunheum na | hyunho lee |
In-app purchases
CRock
No in-app purchases
100 Dev Mistakes
- 1λ¬ κ΅¬λ $2.991 Month
- 1λ ꡬλ $14.991 Year
- νμ ꡬ맀$19.99









