# Friendly Check In vs SDF

The clearest difference is update cadence: Friendly Check In at every 2 days against SDF's every 4 months. SDF's advantage is iOS requirement (15.1 vs 17.6). 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.

Friendly Check In ships an update every 2 days, SDF every 4 months. Both last shipped on October 1, 2026.

## The numbers

| Metric | Friendly Check In | SDF |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 months |
| Size | 15 MB | 42 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Friendly Systems Group LLP](https://appshunter.io/developer/1781091487) | [Colegio de Escribanos de la Ciudad de Buenos Aires](https://appshunter.io/developer/1185879051) |

## What reviewers say

### Friendly Check In

[App page](https://appshunter.io/ios/app/friendly-check-in/id6743733698)

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

**In-app purchases:** none


### SDF

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

**In-app purchases:** none


## Frequently asked questions

### Is Friendly Check In free?

Friendly Check In is free to download, with no in-app purchases.

### Is SDF free?

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

### Do Friendly Check In or SDF have ads?

Neither Friendly Check In nor SDF shows ads.

### Which is updated more often, Friendly Check In or SDF?

Friendly Check In ships an update every 2 days, and SDF every 4 months. Most recently, Friendly Check In was updated on October 1, 2026 and SDF on October 1, 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.*