# Holyiot vs Contour Detection

The clearest difference is ads: Holyiot at none against Contour Detection's shown. Holyiot also leads on iOS requirement (12.0 vs 17.7.2). Contour Detection's advantage is update cadence (fortnightly vs every 24 months). On price, in-app purchases and device support there is nothing between them.

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

Holyiot ships an update every 24 months, Contour Detection fortnightly. The most recent releases landed on September 20, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Holyiot | Contour Detection |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 24 months | **Fortnightly** |
| Size | 16 MB | 36 MB |
| Requires iOS | **12.0** | 17.7.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Hong yi yun jia technology Co.,LTD](https://appshunter.io/developer/1188616341) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Holyiot

[App page](https://appshunter.io/ios/app/holyiot-dfu/id6445978221)

**Features:** macOS Compatibility

**In-app purchases:** none


### Contour Detection

[App page](https://appshunter.io/ios/app/contour-detection/id6511213082)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Holyiot free?

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

### Is Contour Detection free?

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

### Do Holyiot or Contour Detection have ads?

Contour Detection shows ads; Holyiot does not.

### Which is updated more often, Holyiot or Contour Detection?

Holyiot ships an update every 24 months, and Contour Detection fortnightly. Most recently, Holyiot was updated on September 20, 2026 and Contour Detection on October 15, 2026.

---

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