Comparison

Vernier Caliper Micrometer vs Kaliper

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

Head to head
About

Vernier Caliper Micrometer

This utility app transforms your iPhone or iPad into a precise measuring tool for short lengths. It supports both inch and centimeter units, features calibration, and offers a user-friendly interface.

Highlights
  • Measures short lengths
  • Supports inches and centimeters
  • Unit switching
  • Calibration feature
  • Easy to use interface
  • Attractive UI
Features
Read full description

This app turns your iPhone into a vernier caliper. Features: + Designed for measuring short length + Support both inch and centimeter + Unit switch + Calibration + Easy to use + Good-looking UI

About

Kaliper

Measure key cuts accurately using your device's camera. This utility helps decode keys when a physical caliper is unavailable or difficult to read. Offers predefined systems and custom measurement options for various lock types.

Highlights
  • Measure key cuts with device camera
  • Predefined lock systems
  • Custom key measurement input
  • Ad-free upgrade option
  • Supports various lock brands
Features
Read full description

Out-of-the-shop and out-of-the-van key gauge utility. Have a key you need to decode but no caliper or key gauge nearby? Not 100% confident on your eyesight to read the cuts? Then use your iDevice to measure the key with Kaliper. Kaliper is free to download with a purchase option for upgrading. It is recommended to get accustomed to the app prior to purchasing as with any tool, this app has a learning curve and with practice comes perfection. The free version comes with two predefined systems: Arrow .014" and Schlage .015" (5 pin only). The full version comes with eight predefined systems: Arrow .014" (5/6 pin), Best A2, A3, A4 (6/7 pin), Kwikset .023" (standard/titan), Sargent .020" (5/6 pin), Schlage .015" (5/6 pin), and Yale .019" (5/6 pin). In addition to custom key measurements and of course no ads. Instructions: On the main page begin by selecting your iDevice from the choices on the left, then select either a predefined system or custom. Do not use full screen on iPads. 

Predefined: 

Lay your device on a flat surface and place your key on top of the silhouette, using the top shoulder (or bottom tip for best systems) as the primary focus for alignment. If aligned properly each of the cut markers will sit directly above each corresponding cut. If necessary, use the zoom control at the bottom for a better fit. Once the key is aligned, tap on the first down arrow in the upper right hand corner to lower the cut marker. Each tap represents a deeper cut with the depth displayed directly above the arrow. Keep tapping until the marker outlines the cut. If the marker starts to disappear behind the key use the up arrow to raise the marker. Do this for the remaining cuts to finish measuring your key. Custom: The measuring process remains the same as the predefined systems, but as the markers are customizable some measurements need to be supplied before proceeding: Bow to First Cut: The distance from the center of the first cut to the top shoulder. Cut to Cut: The distance between the center of each cut. Shallowest Depth: The distance from the bottom of the blade to the center of the lowest cut in the system (i.e. Zero or One). Depth Increment: The distance between subsequent cuts. These measurements are typically found on pinning kits, however the system you are inputting may be found on the Charts page. From this chart simply tap on the system and all the measurements will be automatically applied. If inputting manually, type the measurements into the 4 boxes and tap Apply. The markers will adjust accordingly and you can begin measuring the key using the shoulder and blade for alignment. If the system uses a One as the shallowest cut, tap on 0 - 9 to reflect a 1 thru 10 cut system. Tap again to switch back. Compatibility (sorted by screen size): iPhone SE2, SE3, 12 mini, 13 mini, 11 Pro, 11, 12, 12 Pro, 13, 13 Pro, 14, 14 Pro, 15, 15 Pro, 16, 16e, 17e, 16 Pro, 17, 17 Pro, Air, 11 Pro Max, 12 Pro Max, 13 Pro Max, 14 Plus, 14 Pro Max, 15 Plus, 15 Pro Max, 16 Plus, 16 Pro Max, 17 Pro Max Found a bug? Something not working? Have a suggestion? Feel free to contact me via email: farren@phoxlocks.com

Screenshots

Vernier Caliper Micrometer3 screens
Kaliper4 screens

Verdict

The call

The clearest difference is rating: Kaliper at 4.6 against Vernier Caliper Micrometer's 4.1. Kaliper also leads on update cadence (every 8 months vs every 20 months). Vernier Caliper Micrometer's advantage is ads (none vs shown) and iOS requirement (9.0 vs 14.0). On price, review sentiment, ratings volume and in-app purchases 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. Vernier Caliper Micrometer sells 1 one-off in-app purchase and Kaliper sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Kaliper holds the better App Store score, 4.6 against 4.1. Both are backed by a comparable volume of ratings — 22 and 8 respectively. Written reviews split almost evenly too, at 50% and 50% positive.

UpkeepUpdate frequency

Vernier Caliper Micrometer ships an update every 20 months, Kaliper every 8 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
Vernier Caliper Micrometer versus Kaliper: the parameters behind the verdict, then further details
ParameterVernier Caliper MicrometerKaliper
PriceFreeFree
Rating4.1 (22 ratings)4.6 (8 ratings) — better
Positive reviews50.0% of reviews50.0% of reviews
Number of ratings22 — better8
Update frequencyEvery 20 monthsEvery 8 months — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS9.0 — better14.0
Further details — not scored
Size24 MB4 MB
Age rating4+4+
Developer齐 陈Farren Domenici

Customer experience

Vernier Caliper Micrometer

All ratings22 ratings
Positive86.4%
Neutral0.0%
Negative13.6%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Kaliper

All ratings8 ratings
Positive87.5%
Neutral12.5%
Negative0.0%
Written reviews6 reviews
Positive50.0%
Neutral33.3%
Negative16.7%

In-app purchases

1 purchases

Vernier Caliper Micrometer

One-time1
  • Remove Ads$0.99
1 purchases

Kaliper

One-time1
  • Kaliper Full Version$1.99

Questions

Is Vernier Caliper Micrometer free?
Vernier Caliper Micrometer is free to download, with in-app purchases available.
Is Kaliper free?
Kaliper is free to download, with in-app purchases available.
Which has better reviews, Vernier Caliper Micrometer or Kaliper?
Kaliper is rated higher. Vernier Caliper Micrometer averages 4.1 out of 5 from 22 ratings, while Kaliper averages 4.6 from 8 ratings.
Do Vernier Caliper Micrometer or Kaliper have ads?
Kaliper shows ads; Vernier Caliper Micrometer does not.
Which is updated more often, Vernier Caliper Micrometer or Kaliper?
Vernier Caliper Micrometer ships an update every 20 months, and Kaliper every 8 months. Most recently, Vernier Caliper Micrometer was updated on November 2, 2026 and Kaliper on November 3, 2026.

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