# Observo vs SitePREP®

The clearest difference is in-app purchases: Observo at none against SitePREP®'s 1. Observo also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (9.0 vs 14.0). On price, ads and device support there is nothing between them.

Both are free to download. SitePREP® sells 1 in-app purchase, starting at $349.99 per year. Observo asks for nothing beyond the download.

Observo ships an update every 3 weeks, SitePREP® every 2 months. The most recent releases landed on September 14, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | Observo | SitePREP® |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (8 ratings)](https://appshunter.io/ios/app/siteprep/id1489189125/reviews)** |
| Number of ratings | — | **8** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | — | Free with in-app purchases |
| Size | 174 MB | 45 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Unit Solutions AG](https://appshunter.io/developer/639539274) | [SitePrep LLC.](https://appshunter.io/developer/1468883144) |

## What reviewers say

### Observo

[App page](https://appshunter.io/ios/app/observo/id1017780435)

**In-app purchases:** none


### SitePREP®

[App page](https://appshunter.io/ios/app/siteprep/id1489189125)

Capture site data with photos and notes, automatically plotting them on a map. Generate and email detailed reports directly from your mobile device, saving time and increasing accuracy.

**Highlights:** Photo data collection, Note and observation capture, Automatic GPS location and direction, Photo plotting on satellite map, Report generation and emailing, Export to word processing applications

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SitePREP Annual Subscription | $349.99 | per year |


## Frequently asked questions

### Is Observo free?

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

### Is SitePREP® free?

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

### Do Observo or SitePREP® have ads?

Neither Observo nor SitePREP® shows ads.

### Which is updated more often, Observo or SitePREP®?

Observo ships an update every 3 weeks, and SitePREP® every 2 months. Most recently, Observo was updated on September 14, 2026 and SitePREP® on June 10, 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.*