# Holyiot vs Contour Detection

The clearest difference is ads: Holyiot at none against Contour Detection's shown. Holyiot also leads on iOS requirement (10.0 vs 17.7.2). Contour Detection's advantage is update cadence (fortnightly vs every 3 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 3 months, Contour Detection fortnightly. The most recent releases landed on October 3, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Holyiot | Contour Detection |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Fortnightly** |
| Size | 28 MB | 36 MB |
| Requires iOS | **10.0** | 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-sensor/id6449424647)

**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 3 months, and Contour Detection fortnightly. Most recently, Holyiot was updated on October 3, 2026 and Contour Detection on September 30, 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.*