# 3K Pro vs Lens thickness calculator

The clearest difference is update cadence: 3K Pro at fortnightly against Lens thickness calculator's every 2 months. 3K Pro also leads on device support (3 vs 1) and iOS requirement (13.0 vs 18.6). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

3K Pro ships an update fortnightly, Lens thickness calculator every 2 months. The most recent releases landed on October 27, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 3K Pro | Lens thickness calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Size | 62 MB | 39 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Omar ElMesiry](https://appshunter.io/developer/1759414005) | [Andrii Parkhomov](https://appshunter.io/developer/1858407504) |

## What reviewers say

### 3K Pro

[App page](https://appshunter.io/ios/app/3k-pro/id6587550249)

**Features:** macOS Compatibility

**In-app purchases:** none


### Lens thickness calculator

[App page](https://appshunter.io/ios/app/lens-thickness-calculator/id6757977779)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 3K Pro free?

3K Pro is free to download, with no in-app purchases.

### Is Lens thickness calculator free?

Lens thickness calculator is free to download, with no in-app purchases.

### Do 3K Pro or Lens thickness calculator have ads?

Neither 3K Pro nor Lens thickness calculator shows ads.

### Which is updated more often, 3K Pro or Lens thickness calculator?

3K Pro ships an update fortnightly, and Lens thickness calculator every 2 months. Most recently, 3K Pro was updated on October 27, 2026 and Lens thickness calculator 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.*