# SDF vs REDDO

The clearest difference is update cadence: REDDO at fortnightly against SDF's every 4 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.

SDF ships an update every 4 months, REDDO fortnightly. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | SDF | REDDO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Size | 42 MB | 16 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Colegio de Escribanos de la Ciudad de Buenos Aires](https://appshunter.io/developer/1185879051) | [Orbesoftware](https://appshunter.io/developer/1845113548) |

## What reviewers say

### SDF

[App page](https://appshunter.io/ios/app/sdf/id6747388469)

**In-app purchases:** none


### REDDO

[App page](https://appshunter.io/ios/app/reddo/id6754045412)

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

**In-app purchases:** none


## Frequently asked questions

### Is SDF free?

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

### Is REDDO free?

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

### Do SDF or REDDO have ads?

Neither SDF nor REDDO shows ads.

### Which is updated more often, SDF or REDDO?

SDF ships an update every 4 months, and REDDO fortnightly. Most recently, SDF was updated on October 1, 2026 and REDDO on October 5, 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.*