# Safety Observer 3.0 vs SignPrep

The clearest difference is in-app purchases: Safety Observer 3.0 at none against SignPrep's 3. Safety Observer 3.0 also leads on iOS requirement (16.4 vs 26.0). SignPrep's advantage is update cadence (every 4 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. SignPrep sells 3 one-off in-app purchases. Safety Observer 3.0 asks for nothing beyond the download.

Safety Observer 3.0 ships an update monthly, SignPrep every 4 days. The most recent releases landed on September 25, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Safety Observer 3.0 | SignPrep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 37 MB | 45 MB |
| Requires iOS | **16.4** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [The National Research Centre for the Working Environment](https://appshunter.io/developer/1456795250) | [Daniel Yong (Singapore)](https://appshunter.io/developer/1887392234) |

## What reviewers say

### Safety Observer 3.0

[App page](https://appshunter.io/ios/app/safety-observer-30/id1671123027)

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

**In-app purchases:** none


### SignPrep

[App page](https://appshunter.io/ios/app/signprep/id6761029767)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $1.99 | one-time |
| Kind Tip | $4.99 | one-time |
| Generous Tip | $9.99 | one-time |


## Frequently asked questions

### Is Safety Observer 3.0 free?

Safety Observer 3.0 is free to download, with no in-app purchases.

### Is SignPrep free?

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

### Do Safety Observer 3.0 or SignPrep have ads?

Neither Safety Observer 3.0 nor SignPrep shows ads.

### Which is updated more often, Safety Observer 3.0 or SignPrep?

Safety Observer 3.0 ships an update monthly, and SignPrep every 4 days. Most recently, Safety Observer 3.0 was updated on September 25, 2026 and SignPrep on November 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.*