# 123 numbers counting vs Optical Flow Drone Navigation

The clearest difference is in-app purchases: 123 numbers counting at none against Optical Flow Drone Navigation's 1. 123 numbers counting also leads on iOS requirement (12.0 vs 16.6). Optical Flow Drone Navigation's advantage is update cadence (every 4 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Optical Flow Drone Navigation sells 1 one-off in-app purchase. 123 numbers counting asks for nothing beyond the download.

123 numbers counting ships an update every 3 months, Optical Flow Drone Navigation every 4 days. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | 123 numbers counting | Optical Flow Drone Navigation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Size | 82 MB | 8 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) | [EMIRHAN CELIK](https://appshunter.io/developer/1815124388) |

## What reviewers say

### 123 numbers counting

[App page](https://appshunter.io/ios/app/123-numbers-counting/id6477532234)

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

**In-app purchases:** none


### Optical Flow Drone Navigation

[App page](https://appshunter.io/ios/app/optical-flow-drone-navigation/id6746093813)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MAVLink Mode Unlock | $1.99 | one-time |


## Frequently asked questions

### Is 123 numbers counting free?

123 numbers counting is free to download, with no in-app purchases.

### Is Optical Flow Drone Navigation free?

Optical Flow Drone Navigation is free to download, with in-app purchases available.

### Do 123 numbers counting or Optical Flow Drone Navigation have ads?

Neither 123 numbers counting nor Optical Flow Drone Navigation shows ads.

### Which is updated more often, 123 numbers counting or Optical Flow Drone Navigation?

123 numbers counting ships an update every 3 months, and Optical Flow Drone Navigation every 4 days. Most recently, 123 numbers counting was updated on October 9, 2026 and Optical Flow Drone Navigation on October 1, 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.*