# GreenData vs Citeck ECOS

The clearest difference is update cadence: GreenData at every 3 weeks against Citeck ECOS's every 13 months. Citeck ECOS's advantage is iOS requirement (12.4 vs 14.0). 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.

GreenData ships an update every 3 weeks, Citeck ECOS every 13 months. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | GreenData | Citeck ECOS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 13 months |
| Size | 215 MB | 10 MB |
| Requires iOS | 14.0 | **12.4** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GreenData](https://appshunter.io/developer/1047549512) | [Citeck LLC](https://appshunter.io/developer/1473148859) |

## What reviewers say

### GreenData

[App page](https://appshunter.io/ios/app/greendata/id1467346474)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Citeck ECOS

[App page](https://appshunter.io/ios/app/citeck-ecos/id1473148860)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GreenData free?

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

### Is Citeck ECOS free?

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

### Do GreenData or Citeck ECOS have ads?

Neither GreenData nor Citeck ECOS shows ads.

### Which is updated more often, GreenData or Citeck ECOS?

GreenData ships an update every 3 weeks, and Citeck ECOS every 13 months. Most recently, GreenData was updated on October 2, 2026 and Citeck ECOS on October 10, 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.*