App Lock vs 100 Dev Mistakes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
App Lock
This app offers robust privacy and protection features for your device. Secure your applications with password or face unlock, prevent unwanted installations and deletions, and block in-app purchases. Customize restriction modes for different activities to manage screen time effectively.
- Password protection for apps
- Prevent app installation
- Prevent app deletion
- Block in-app purchases
- Customizable restriction modes
- Face unlock support
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Regardless of whether you're willing or not, electronic devices have become indispensable tools for children amidst the pandemic. At-home parenting has become reliant on electronic products, as they serve as productivity enhancers, but that doesn't mean parents can completely let go. To address this, we've introduced a powerful application aimed at providing comprehensive app protection and privacy management features. This application includes the following features: Password Protection: Users can set password protection for restricted applications, ensuring only authorized users can access them. Prevent Installation: This feature prevents the installation of new applications from the app store, effectively controlling the number and type of applications on the device. Prevent Deletion: Prevents accidental deletion of applications, particularly those containing important data like chat records, ensuring data security. In-App Purchase Blocking: Blocks in-app payments to prevent users from incurring additional costs unintentionally. Multiple Mode Switching and App Restriction Grouping: Users can customize app restriction modes for different scenarios such as learning, socializing, and gaming, and can also add custom groups to control screen time more flexibly. Set Application Password: Users can set a separate password for this application to protect its settings and features from unauthorized access. Face Unlock: In addition to passwords, users can use face unlock to quickly unlock applications, enhancing convenience and security. Subscription Services: Payment: Payments are deducted through the user's iTunes account immediately upon purchase confirmation, offering various subscription modes for users to choose from. Renewal: Apple iTunes accounts will be charged 24 hours before expiration, with the subscription period extending by 1 cycle upon successful payment. Cancel Subscription Renewal: To cancel subscription renewal, manually disable auto-renewal in Settings/Apple ID at least 24 hours before the current subscription expires.
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 ads: 100 Dev Mistakes at none against App Lock's shown. App Lock's advantage is update cadence (weekly vs every 4 months) and iOS requirement (16.0 vs 26.0). On price, 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. App Lock sells 1 in-app purchase, starting at $2.99 per month and 100 Dev Mistakes sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
App Lock ships an update weekly, 100 Dev Mistakes every 4 months. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.
| Parameter | App Lock | 100 Dev Mistakes |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (5 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Weekly — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 53 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | 小玲 黄 | hyunho lee |
In-app purchases
App Lock
- Pro3 Days trial$2.991 Month
100 Dev Mistakes
- 1달 구독$2.991 Month
- 1년 구독$14.991 Year
- 평생 구매$19.99









