# Spec Go Green vs One Union

The clearest difference is update cadence: One Union at every 4 days against Spec Go Green's every 3 weeks. Spec Go Green's advantage is iOS requirement (10.0 vs 15.6). 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.

Spec Go Green ships an update every 3 weeks, One Union every 4 days. The most recent releases landed on November 6, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Spec Go Green | One Union |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 174 MB | 49 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [4Orange](https://appshunter.io/developer/1368961571) | [Thai Cong Tran](https://appshunter.io/developer/1734079715) |

## What reviewers say

### Spec Go Green

[App page](https://appshunter.io/ios/app/spec-go-green/id1434794674)

**Features:** macOS Compatibility

**In-app purchases:** none


### One Union

[App page](https://appshunter.io/ios/app/one-union/id6738283505)

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

**In-app purchases:** none


## Frequently asked questions

### Is Spec Go Green free?

Spec Go Green is free to download, with no in-app purchases.

### Is One Union free?

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

### Do Spec Go Green or One Union have ads?

Neither Spec Go Green nor One Union shows ads.

### Which is updated more often, Spec Go Green or One Union?

Spec Go Green ships an update every 3 weeks, and One Union every 4 days. Most recently, Spec Go Green was updated on November 6, 2026 and One Union on November 8, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*