# OneKit vs Ruler & Digital Caliper

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.

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.

## The numbers

| Metric | OneKit | Ruler & Digital Caliper |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 5 MB | 6 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Olekcii Ponomarenko](https://appshunter.io/developer/1577090637) | [Yurii Koshkin](https://appshunter.io/developer/1873601061) |

## What reviewers say

### OneKit

[App page](https://appshunter.io/ios/app/onekit-smart-digital-toolbox/id6757952765)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly subscription | $2.99 | per 7 days |
| Monthly subscription | $9.99 | per month |
| Yearly subscription | $49.99 | per year |


### Ruler & Digital Caliper

[App page](https://appshunter.io/ios/app/ruler-and-digital-caliper/id6806950163)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $9.99 | one-time |


## Frequently asked questions

### Is OneKit free?

OneKit is free to download, with in-app purchases available.

### Is Ruler & Digital Caliper free?

Ruler & Digital Caliper is free to download, with in-app purchases available.

### Do OneKit or Ruler & Digital Caliper have ads?

Neither OneKit nor Ruler & Digital Caliper shows ads.

### Which is updated more often, OneKit or Ruler & Digital Caliper?

OneKit ships an update every 3 weeks, and Ruler & Digital Caliper every 4 days. Most recently, OneKit was updated on October 13, 2026 and Ruler & Digital Caliper on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*