# CSI Spaces vs UnderText

The clearest difference is in-app purchases: CSI Spaces at none against UnderText's 2. CSI Spaces also leads on iOS requirement (17.0 vs 26.0). UnderText's advantage is update cadence (weekly vs every 8 months). On price, ads and device support there is nothing between them.

Both are free to download. UnderText sells 2 in-app purchases, starting at $2.99 per month. CSI Spaces asks for nothing beyond the download.

CSI Spaces ships an update every 8 months, UnderText weekly. The most recent releases landed on October 19, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CSI Spaces | UnderText |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Size | 28 MB | 5 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Centre for Social Innovation](https://appshunter.io/developer/1526945793) | [Xuan Tuan Nguyen](https://appshunter.io/developer/1851803746) |

## What reviewers say

### CSI Spaces

[App page](https://appshunter.io/ios/app/csi-spaces/id1528930586)

**Features:** macOS Compatibility

**In-app purchases:** none


### UnderText

[App page](https://appshunter.io/ios/app/undertext/id6755081094)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UnderText Premium (monthly) | $2.99 | per month |
| UnderText Premium (Yearly) | $23.99 | per year |


## Frequently asked questions

### Is CSI Spaces free?

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

### Is UnderText free?

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

### Do CSI Spaces or UnderText have ads?

Neither CSI Spaces nor UnderText shows ads.

### Which is updated more often, CSI Spaces or UnderText?

CSI Spaces ships an update every 8 months, and UnderText weekly. Most recently, CSI Spaces was updated on October 19, 2026 and UnderText on October 11, 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.*