OneKit vs Ruler & Digital Caliper
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
OneKit
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OneKit Smart Toolbox is a smart measurement app transforms your phone into universal digital instrument. If you want to take quick measurements at your house, during work or when you are out this app has necessary tools in one friendly interface. No need for additional gadgets, just launch the app and start measuring right away. The ruler feature helps you to measure length and distance by directly pointing at the screen with very high accuracy. Great for quick verifications, school assignments or home improvement the ruler comes with both metric and imperial units. With the protractor tool angle measurements are swift and easy. All you have to do is position your gadget and it will give you accurate angle measurements within a few seconds. This instrument can be used by students, engineers, architects and anyone else who needs to measure angles or do construction work using an device. Noise meter keeps you updated with real sound level. It hardly matters if you're measuring the noise of the environment, sound exposure at the workplace or just taking a glance around this tool will give you decibel levels and turn your device into a convenient sound measuring gadget. The integrated metronome is a great help musicians and performers as it is tightly tuned to controlling tempos precisely. Input your BPM, select your rhythm and maintain the exact timing for your rehearsals. Speedometer feature can track your running speed in realtime with GPS technology. It's perfect for cycling, running or driving and it shows your speed clearly and accurately. The level tool can be used to check the alignment of the surfaces or the objects in the horizontal as well as vertical directions with great accuracy. Whenever you use it to hang pictures or even making different types of home improvements the digital level will keep everything in perfect balance. Terms and Privacy: Privacy Policy: https://sites.google.com/view/ipprivacy-policy/ Terms of Use: https://sites.google.com/view/iterms/
Ruler & Digital Caliper
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Measure small, flat objects on your iPhone with an edge ruler and two-jaw digital caliper. On supported iPhone models, start with an approximate device-based screen scale. For a physical check, align a ruler with a 20 mm reference on screen. Lifetime access requires a separate one-time purchase and adds repeated measurements and a session workspace: view a result, use it as a reference, and compare the next object. Results and references remain in the current session. TWO FOCUSED TOOLS ⢠Edge ruler with a movable origin and end marker ⢠Digital caliper with two independently adjustable jaws ⢠Magnified contact guide for placing markers at object edges ⢠Fine-adjust controls for small position changes ⢠Reset markers without resetting calibration FOUR UNIT FORMATS ⢠Millimeters ⢠Centimeters ⢠Decimal inches ⢠Fractional inches, rounded to the nearest 1/64 BUILT FOR REAL-WORLD ALIGNMENT Keep a small object flat against the usable screen edge, move the contact points to its edges, and read the result. Switch tools and units as you work. Use portrait or either landscape orientation, and lock orientation while aligning an object. PRIVATE BY DESIGN Measurement values and marker positions are calculated on your iPhone. There is no account, advertising, camera access, or measurement server. Limited privacy-conscious product analytics never include measurement values, marker positions, or calibration data. Calibration and preferences are stored locally. A PRACTICAL SCREEN TOOL Results depend on calibration, alignment, display settings, screen protectors or cases, and the object being measured. Recalibrate after changing iPhone or Display Zoom. For important measurements, compare the result with a known physical reference. Ruler & Digital Caliper is not a certified measuring instrument. Support: https://rulercaliper.app/support Privacy Policy: https://rulercaliper.app/privacy Terms of Use: https://rulercaliper.app/terms
Screenshots
Verdict
The clearest difference is update cadence: Ruler & Digital Caliper at every 4 days against OneKit's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. OneKit sells 3 in-app purchases, starting at $2.99 per 7 days and Ruler & Digital Caliper sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
OneKit ships an update every 3 weeks, Ruler & Digital Caliper every 4 days. The most recent releases landed on October 13, 2026 and October 31, 2026 respectively.
| Parameter | OneKit | Ruler & Digital Caliper |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 4 days ā better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad ā better | iPhone |
| Requires iOS | 18.6 | 17.0 ā better |
| Further details ā not scored | ||
| Size | 5 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Olekcii Ponomarenko | Yurii Koshkin |
In-app purchases
OneKit
- Weekly subscription$2.997 Days
- Monthly subscription$9.991 Month
- Yearly subscription$49.991 Year
Ruler & Digital Caliper
- Lifetime Access$9.99
Questions
Is OneKit free?
Is Ruler & Digital Caliper free?
Do OneKit or Ruler & Digital Caliper have ads?
Which is updated more often, OneKit or Ruler & Digital Caliper?
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