# EcoWatt vs AirBuilding

The clearest difference is in-app purchases: EcoWatt at none against AirBuilding's 1. EcoWatt also leads on iOS requirement (13.0 vs 16.6). AirBuilding's advantage is update cadence (fortnightly vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. AirBuilding sells 1 in-app purchase, starting at $24.99 per month. EcoWatt asks for nothing beyond the download.

EcoWatt ships an update every 2 months, AirBuilding fortnightly. Both last shipped on October 17, 2026.

## The numbers

| Metric | EcoWatt | AirBuilding |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Size | 26 MB | 17 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RTE Reseau de transport d'electricite](https://appshunter.io/developer/424593996) | [Aurelien Ribon](https://appshunter.io/developer/1737509079) |

## What reviewers say

### EcoWatt

[App page](https://appshunter.io/ios/app/ecowatt-rte/id1645566499)

**Features:** macOS Compatibility

**In-app purchases:** none


### AirBuilding

[App page](https://appshunter.io/ios/app/airbuilding-analytics/id6755592591)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 site | $24.99 | per month |


## Frequently asked questions

### Is EcoWatt free?

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

### Is AirBuilding free?

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

### Do EcoWatt or AirBuilding have ads?

Neither EcoWatt nor AirBuilding shows ads.

### Which is updated more often, EcoWatt or AirBuilding?

EcoWatt ships an update every 2 months, and AirBuilding fortnightly. Most recently, EcoWatt was updated on October 17, 2026 and AirBuilding on October 17, 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.*