Comparison

MagicLockBox vs Ring Sizer

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

Head to head
About

MagicLockBox

Features
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It is an application for "Magic Lock Box" that enables you to operate the smart key of i car with iPhone. With this app, you can now use your iPhone to perform operations similar to those of a car's smart key, and you no longer have to carry your smart key with you. Of course, it is possible to register multiple smart keys.

About

Ring Sizer

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RingSizer: Find Your Perfect Ring Size Instantly! With our ringfitter tool finding the right ring size has never been easier! With RingSizer, you can quickly measure your finger and convert ring sizes across different countries in just a few taps. Whether you're shopping for yourself or buying a gift, our app ensures you get the perfect fit every time. Features: Accurate Ring Measurement: Easily measure your ring size using your phone and get precise results. Country Size Conversion: Instantly convert ring sizes between US, UK, EU, Japan, and more! Simple & Intuitive: Designed for ease of use, making it ideal for anyone looking to buy rings online or in stores. Works Offline: No internet? No problem! Use RingSizer anywhere, anytime. Why Choose RingSizer? Avoid costly returns and resizing fees. Perfect for buying rings for yourself or loved ones across the globe. Download RingSizer - Your Ring size! now and make sure every ring fits just right! A premium subscription is required to unlock all the features of the app. The subscription payments will be charged to the App Store account upon purchase confirmation. Subscriptions automatically renew and will be charged unless auto-renewal is turned off at least 24 hours before the end of the free trial period. Any unused portion of the free trial period will be forfeited upon purchasing a premium subscription during the free trial. The renewal cost depends on the chosen subscription plan. Term Of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

MagicLockBox2 screens
Ring Sizer4 screens

Verdict

The call

The clearest difference is in-app purchases: MagicLockBox at none against Ring Sizer's 6. MagicLockBox also leads on device support (4 vs 2). Ring Sizer's advantage is update cadence (every 4 days vs every 2 months) and iOS requirement (13.4 vs 15.6). On price and ads there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Ring Sizer sells 6 in-app purchases, starting at $2.99 per 7 days. MagicLockBox asks for nothing beyond the download.

UpkeepUpdate frequency

MagicLockBox ships an update every 2 months, Ring Sizer every 4 days. The most recent releases landed on September 24, 2026 and September 14, 2026 respectively.

Scorecard4 real differences ยท 2 level
MagicLockBox versus Ring Sizer: the parameters behind the verdict, then further details
ParameterMagicLockBoxRing Sizer
PriceFreeFree
Update frequencyEvery 2 monthsEvery 4 days โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPad, iPod, Apple Watch โ€” betteriPhone, iPod
Requires iOS15.613.4 โ€” better
Further details โ€” not scored
Size3 MB46 MB
Age rating4+4+
DeveloperSYSTEM DESIGN CORPFabrizio Beccaceci

In-app purchases

None

MagicLockBox

No in-app purchases

6 purchases

Ring Sizer

Subscriptions4
  • Ring Sizer Pro3 Days trial$2.997 Days
  • Ring Sizer Pro$5.991 Month
  • Ring Sizer Pro$6.991 Month
Show 1 more
  • Ring Sizer Pro$29.991 Year
One-time2
  • RingSizer Lifetime$14.99
  • RingSizer Lifetime$39.99

Questions

Is MagicLockBox free?
MagicLockBox is free to download, with no in-app purchases.
Is Ring Sizer free?
Ring Sizer is free to download, with in-app purchases available.
Do MagicLockBox or Ring Sizer have ads?
Neither MagicLockBox nor Ring Sizer shows ads.
Which is updated more often, MagicLockBox or Ring Sizer?
MagicLockBox ships an update every 2 months, and Ring Sizer every 4 days. Most recently, MagicLockBox was updated on September 24, 2026 and Ring Sizer on September 14, 2026.

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