Kaliper vs Centrios
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Measure key cuts with device camera
- Predefined lock systems
- Custom key measurement input
- Ad-free upgrade option
- Supports various lock brands
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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
Centrios
Manage business access remotely with a smart lock system. Control locks, grant temporary access to staff and visitors, and monitor activity logs. Ideal for businesses needing secure and flexible entry management.
- Unlock and lock doors remotely
- Grant access to staff and visitors
- Create and edit access schedules
- View activity and access history
- Manage multiple locations
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Centrios is a smart access platform designed specifically for small and growing businesses just like yours. With our intuitive and easy-to-use app, you can connect your Centrios smart locks and smart readers to your business in the matter of seconds. With the Centrios app, you can: Unlock and lock your locks with the touch of your mobile phone. Grant access to staff and visitors to multiple devices. Create and edit access schedules. View recent activities including access history, low battery reports, and more. View system details including subscription level and user capacities. Manage and access multiple locations with a single sign on. Get started today!
Screenshots
Verdict
Kaliper and Centrios both sit at 4.6 stars, but that hides the real split: 90% of Centrios's written reviews are positive against 50% of Kaliper's. Centrios also leads on in-app purchases (none vs 1) and update cadence (every 6 weeks vs every 8 months). Kaliper's advantage is iOS requirement (14.0 vs 16.0). On price, rating, ratings volume and ads 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. Kaliper sells 1 one-off in-app purchase. Centrios asks for nothing beyond the download.
Kaliper holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 8 and 14 respectively. Written reviews complicate that: 50% of Kaliper's written reviews are positive against 90% of Centrios's, so the app with the better star average is not the one people write more warmly about.
Kaliper ships an update every 8 months, Centrios every 6 weeks. The most recent releases landed on September 23, 2026 and October 6, 2026 respectively.
| Parameter | Kaliper | Centrios |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (8 ratings) — better | 4.4 (14 ratings) |
| Positive reviews | 50.0% of reviews | 90.5% of reviews — better |
| Number of ratings | 8 | 14 — better |
| Update frequency | Every 8 months | Every 6 weeks — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 4 MB | 371 MB |
| Age rating | 4+ | 4+ |
| Developer | Farren Domenici | Assa Abloy Of Canada Ltd |
Customer experience
Kaliper
Centrios
In-app purchases
Kaliper
- Kaliper Full Version$1.99
Centrios
No in-app purchases
Questions
Is Kaliper free?
Is Centrios free?
Which has better reviews, Kaliper or Centrios?
Do Kaliper or Centrios have ads?
Which is updated more often, Kaliper or Centrios?
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