# GEM Client vs Opti Clinometer

The clearest difference is update cadence: Opti Clinometer at every 2 days against GEM Client's every 6 weeks. GEM Client's advantage is device support (4 vs 1) and iOS requirement (9.0 vs 17.0). 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.

GEM Client ships an update every 6 weeks, Opti Clinometer every 2 days. The most recent releases landed on September 17, 2026 and August 21, 2026 respectively.

## The numbers

| Metric | GEM Client | Opti Clinometer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Size | 30 MB | 2 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [GENASYS](https://appshunter.io/developer/521628704) | [Burak Kizilobek](https://appshunter.io/developer/6788531231) |

## What reviewers say

### GEM Client

[App page](https://appshunter.io/ios/app/gem-client/id1545409967)

**Features:** macOS Compatibility

**In-app purchases:** none


### Opti Clinometer

[App page](https://appshunter.io/ios/app/opti-clinometer/id6788531229)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GEM Client free?

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

### Is Opti Clinometer free?

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

### Do GEM Client or Opti Clinometer have ads?

Neither GEM Client nor Opti Clinometer shows ads.

### Which is updated more often, GEM Client or Opti Clinometer?

GEM Client ships an update every 6 weeks, and Opti Clinometer every 2 days. Most recently, GEM Client was updated on September 17, 2026 and Opti Clinometer on August 21, 2026.

---

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