# OneKit vs Caliper

The clearest difference is in-app purchases: Caliper at none against OneKit's 3. Caliper also leads on update cadence (every 6 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. OneKit sells 3 in-app purchases, starting at $2.99 per 7 days. Caliper asks for nothing beyond the download.

OneKit ships an update every 3 weeks, Caliper every 6 days. The most recent releases landed on October 13, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | OneKit | Caliper |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Size | 5 MB | 2 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Olekcii Ponomarenko](https://appshunter.io/developer/1577090637) | [UFUK OZDEMIR](https://appshunter.io/developer/1885204934) |

## 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 |


### Caliper

[App page](https://appshunter.io/ios/app/caliper-level-ruler-and-angle/id6794116622)

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

**In-app purchases:** none


## Frequently asked questions

### Is OneKit free?

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

### Is Caliper free?

Caliper is free to download, with no in-app purchases.

### Do OneKit or Caliper have ads?

Neither OneKit nor Caliper shows ads.

### Which is updated more often, OneKit or Caliper?

OneKit ships an update every 3 weeks, and Caliper every 6 days. Most recently, OneKit was updated on October 13, 2026 and Caliper on October 25, 2026.

---

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