Comparison

CRock vs 100 Dev Mistakes

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

CRock

Features
Read full description

Still hitting the 'Stop' button and falling back asleep? It’s 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 won’t 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?

About

100 Dev Mistakes

Features
Read full description

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

CRock4 screens
100 Dev Mistakes4 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences Β· 4 level
CRock versus 100 Dev Mistakes: the parameters behind the verdict, then further details
ParameterCRock100 Dev Mistakes
PriceFreeFree
Update frequencyEvery 3 monthsEvery 2 months β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhoneiPhone, iPad β€” better
Requires iOS17.6 β€” better26.0
Further details β€” not scored
Size187 MB13 MB
Age rating4+4+
Developerhyunheum nahyunho lee

In-app purchases

None

CRock

No in-app purchases

3 purchases

100 Dev Mistakes

Subscriptions2
  • 1달 ꡬ독$2.991 Month
  • 1λ…„ ꡬ독$14.991 Year
One-time1
  • 평생 ꡬ맀$19.99

Questions

Is CRock free?
CRock is free to download, with no in-app purchases.
Is 100 Dev Mistakes free?
100 Dev Mistakes is free to download, with in-app purchases available.
Do CRock or 100 Dev Mistakes have ads?
Neither CRock nor 100 Dev Mistakes shows ads.
Which is updated more often, CRock or 100 Dev Mistakes?
CRock ships an update every 3 months, and 100 Dev Mistakes every 2 months. Most recently, CRock was updated on October 30, 2026 and 100 Dev Mistakes on October 31, 2026.

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