# ECS Revision vs Copernicus Sentinel

The clearest difference is review sentiment: ECS Revision at 67% against Copernicus Sentinel's 14%. Copernicus Sentinel's advantage is price (Free vs $4.99) and update cadence (every 2 months vs every 6 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Copernicus Sentinel is free to download; ECS Revision costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ECS Revision ships an update every 6 months, Copernicus Sentinel every 2 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | ECS Revision | Copernicus Sentinel |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.4 (19 ratings)](https://appshunter.io/ios/app/copernicus-sentinel/id1036738151/reviews)** |
| Number of ratings | — | **19** |
| Positive reviews | **66.7% of reviews** | 14.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 4 MB | 56 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [James Kelly](https://appshunter.io/developer/825582894) | [ESA - European Space Agency](https://appshunter.io/developer/429660009) |

## What reviewers say

### ECS Revision

[App page](https://appshunter.io/ios/app/ecs-revision/id934536011)

Prepare for your ECS site card exam with over 400 up-to-date Health and Safety questions. This app offers unlimited test retakes and an AI tutor to assist your studies, allowing you to configure test length and time limits.

**Highlights:** Over 400 Health and Safety questions, Unlimited revision test retakes, AI Tutor for study assistance, Configure number of questions per test, Set time limits for tests, Review wrong answers and see correct answers, Feedback on practice test scores

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

**In-app purchases:** none


### Copernicus Sentinel

[App page](https://appshunter.io/ios/app/copernicus-sentinel/id1036738151)

Explore and track Earth observation satellites in real-time. Discover satellite details, view 3D models, and receive notifications for overhead passes. Stay updated on the latest news and products from this space observation program.

**Highlights:** Real-time satellite tracking, Detailed 3D satellite models, Overhead pass notifications, Latest news and product updates, Historical data transmission visualization, Interactive 3D globe exploration

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

**In-app purchases:** none


## Frequently asked questions

### Is ECS Revision free?

ECS Revision costs $4.99, with no in-app purchases.

### Is Copernicus Sentinel free?

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

### Do ECS Revision or Copernicus Sentinel have ads?

Neither ECS Revision nor Copernicus Sentinel shows ads.

### Which is updated more often, ECS Revision or Copernicus Sentinel?

ECS Revision ships an update every 6 months, and Copernicus Sentinel every 2 months. Most recently, ECS Revision was updated on October 24, 2026 and Copernicus Sentinel on October 24, 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.*