# Wattage Conversion vs Collie

The clearest difference is in-app purchases: Collie at none against Wattage Conversion's 1. Collie also leads on iOS requirement (13.4 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Wattage Conversion sells 1 one-off in-app purchase. Collie asks for nothing beyond the download.

Wattage Conversion ships an update monthly, Collie every 5 weeks. The most recent releases landed on November 8, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Wattage Conversion | Collie |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/collie/id6553976595/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | — | Free |
| Size | 37 MB | 43 MB |
| Requires iOS | 15.6 | **13.4** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [akira ohmachi](https://appshunter.io/developer/1338624340) | [ThingX Technologies Limited](https://appshunter.io/developer/1758023148) |

## What reviewers say

### Wattage Conversion

[App page](https://appshunter.io/ios/app/wattage-conversion/id6473688997)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Collie

[App page](https://appshunter.io/ios/app/collie/id6553976595)

Receive instant fall detection alerts and remotely monitor connected devices. View historical event logs and manage multiple devices with custom names and locations. Protect privacy with local AI processing and thermal imaging data.

**Highlights:** Instant fall detection alerts, Remote device status monitoring, Historical event logs, Multi-device management, Privacy-focused thermal imaging, Local AI processing

**In-app purchases:** none


## Frequently asked questions

### Is Wattage Conversion free?

Wattage Conversion is free to download, with in-app purchases available.

### Is Collie free?

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

### Do Wattage Conversion or Collie have ads?

Neither Wattage Conversion nor Collie shows ads.

### Which is updated more often, Wattage Conversion or Collie?

Wattage Conversion ships an update monthly, and Collie every 5 weeks. Most recently, Wattage Conversion was updated on November 8, 2026 and Collie on November 4, 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.*