Comparison

Ring Sizer vs Caliper

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

Head to head
About

Ring Sizer

Accurately determine your ring size using your phone's screen or a built-in ruler. Supports multiple international sizing standards and allows saving measurements for future use. Ideal for online shoppers and jewelers.

Highlights
  • Measure ring size via diameter or circumference
  • Supports US, UK, EU/ISO, AU, JP, CN, RU sizes
  • Built-in screen ruler for finger measurement
  • Save measurements for multiple users
  • Ad-free experience
Features
Read full description

Sizerly is a simple and precise tool for finding the right ring size using your phone. Whether you already have a ring to measure or need to find your finger size directly, Sizerly offers an intuitive way to get reliable sizing results in seconds. Just place a ring on your screen and adjust the sizing circle, or use the built-in ruler to measure your finger diameter. Sizerly supports all major international sizing standards, so you can shop confidently online or in-store. Key Features: - Measure ring size using diameter or circumference - Includes major size systems: US, UK, EU/ISO, AU, JP, CN, RU - Built-in screen ruler for measuring fingers - Save measurements for future use or multiple users Sizerly is ideal for online shoppers, gift buyers, and jewelers. It’s accurate, easy to use, and designed without ads for a smooth experience. Privacy Policy: https://di-apps-dev.web.app/privacy.html Terms of Use: https://di-apps-dev.web.app/terms.html

About

Caliper

Features
Read full description

Caliper is a pocket precision toolbox — the measuring tools you reach for around the house, in one clean app. FOUR INSTRUMENTS • Bubble Level — 1-axis and surface. A real glycerin vial that turns true at 0.0°. • Ruler — an on-screen scale in mm, cm, or inches. • Angle Finder — a protractor and a tilt clinometer, with roof pitch and grade. • Sound — a quick decibel check of the room. GUIDED JOBS Do not just read a number — get the job done. Hang a Picture, Level a Shelf, Roof Pitch, Level Furniture: each walks you through it and saves the result. A MEASUREMENT LOG Keep every reading and group them into projects — the kitchen shelf, the living-room frames. PRECISION Calibrate the level and ruler with a fine tilt offset, and feel a firm haptic tick the moment a reading is true. HONEST BY DESIGN No ads. No tracking. No accounts. Everything is measured on your device and stays there — Caliper collects no data. The four instruments are free, and the log keeps your most recent 25 readings. Caliper Pro unlocks every guided Job, the unlimited log with projects, and precision calibration. Note: readings depend on your device sensors and are intended for everyday use, not certified measurement. Caliper Pro is an auto-renewing subscription, offered monthly or yearly with a 7-day free trial. Payment is charged to your Apple Account at confirmation of purchase. It renews automatically unless cancelled at least 24 hours before the current period ends; manage or cancel in Settings > Apple Account > Subscriptions. Terms of Use: https://theknack2020-sketch.github.io/caliper/terms-of-use.html Privacy Policy: https://theknack2020-sketch.github.io/caliper/privacy-policy.html

Screenshots

Ring Sizer4 screens
Caliper4 screens

Verdict

The call

The clearest difference is in-app purchases: Caliper at none against Ring Sizer's 2. 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Ring Sizer sells 2 in-app purchases, starting at $3.99 per 7 days. Caliper asks for nothing beyond the download.

UpkeepUpdate frequency

Ring Sizer ships an update every 2 weeks, Caliper every 6 days. The most recent releases landed on October 2, 2026 and October 13, 2026 respectively.

Scorecard1 real difference · 8 level
Ring Sizer versus Caliper: the parameters behind the verdict, then further details
ParameterRing SizerCaliper
PriceFreeFree
Rating3.3 (3 ratings) — better—
Number of ratings3 — better—
Update frequencyEvery 2 weeksEvery 6 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone
Requires iOS16.0 — better17.0
Further details — not scored
Size10 MB2 MB
Age rating4+4+
DeveloperDziyana DashynevichUFUK OZDEMIR

In-app purchases

2 purchases

Ring Sizer

Subscriptions2
  • Weekly Premium$3.997 Days
  • Annual Premium$19.991 Year
None

Caliper

No in-app purchases

Questions

Is Ring Sizer free?
Ring Sizer is free to download, with in-app purchases available.
Is Caliper free?
Caliper is free to download, with no in-app purchases.
Do Ring Sizer or Caliper have ads?
Neither Ring Sizer nor Caliper shows ads.
Which is updated more often, Ring Sizer or Caliper?
Ring Sizer ships an update every 2 weeks, and Caliper every 6 days. Most recently, Ring Sizer was updated on October 2, 2026 and Caliper on October 13, 2026.

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