# E vs ZERO CARBON TH

The clearest difference is update cadence: ZERO CARBON TH at every 3 weeks against E's every 2 months. On price, ads, 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.

E ships an update every 2 months, ZERO CARBON TH every 3 weeks. The most recent releases landed on July 19, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | E | ZERO CARBON TH |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 1 MB | 49 MB |
| Requires iOS | 13.0 | **12** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [DOH (Thailand)](https://appshunter.io/developer/1501306583) | [Thailand Greenhouse Gas Management Organization](https://appshunter.io/developer/938564036) |

## What reviewers say

### E

[App page](https://appshunter.io/ios/app/e-manifest/id1597909927)

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

**In-app purchases:** none


### ZERO CARBON TH

[App page](https://appshunter.io/ios/app/zero-carbon-th/id6468645997)

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

**In-app purchases:** none


## Frequently asked questions

### Is E free?

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

### Is ZERO CARBON TH free?

ZERO CARBON TH is free to download, with no in-app purchases.

### Do E or ZERO CARBON TH have ads?

Neither E nor ZERO CARBON TH shows ads.

### Which is updated more often, E or ZERO CARBON TH?

E ships an update every 2 months, and ZERO CARBON TH every 3 weeks. Most recently, E was updated on July 19, 2026 and ZERO CARBON TH on September 23, 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.*