# Construction Log vs RSA21.app

The clearest difference is in-app purchases: RSA21.app at none against Construction Log's 9. RSA21.app also leads on update cadence (weekly vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Construction Log sells 9 in-app purchases, starting at $5.99 per month. RSA21.app asks for nothing beyond the download.

Construction Log ships an update every 3 months, RSA21.app weekly. The most recent releases landed on October 25, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Construction Log | RSA21.app |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Size | 41 MB | 29 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TOBIAS ROSSMANN](https://appshunter.io/developer/1765097850) | [KMS Gruppe](https://appshunter.io/developer/6810972514) |

## What reviewers say

### Construction Log

[App page](https://appshunter.io/ios/app/construction-log-pro-doku/id6754005836)

**Features:** Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Doku (Premium) - Monthly | $5.99 | per month |
| Company Pro Monatlich | $34.99 | per month |
| Pro Doku (Premium) – Annual | $44.99 | per year |
| Company Ultimate Monatilch | $69.99 | per month |
| Company Unlimited Monatlich | $99.99 | per month |
| Company Pro Jährlich | $299.99 | per year |
| Company Ultimate Jährlich | $599.99 | per year |
| Company Unlimited Jährlich | $899.99 | per year |
| Pro Doku (Premium) - Lifetime | $89.99 | one-time |


### RSA21.app

[App page](https://appshunter.io/ios/app/rsa21app/id6810972512)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Construction Log free?

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

### Is RSA21.app free?

RSA21.app is free to download, with no in-app purchases.

### Do Construction Log or RSA21.app have ads?

Neither Construction Log nor RSA21.app shows ads.

### Which is updated more often, Construction Log or RSA21.app?

Construction Log ships an update every 3 months, and RSA21.app weekly. Most recently, Construction Log was updated on October 25, 2026 and RSA21.app on October 26, 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.*