# DLR COMETS vs B777Q

The clearest difference is in-app purchases: DLR COMETS at none against B777Q's 1. DLR COMETS also leads on iOS requirement (8.1 vs 16.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. B777Q sells 1 in-app purchase, starting at $3.99 per year. DLR COMETS asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 8, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | DLR COMETS | B777Q |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 416 MB | 22 MB |
| Requires iOS | **8.1** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DLR German Aerospace Center e.V.](https://appshunter.io/developer/418202933) | [Appstimize](https://appshunter.io/developer/1555117144) |

## What reviewers say

### DLR COMETS

[App page](https://appshunter.io/ios/app/dlr-comets/id1363156480)

Explore the Rosetta mission to Comet 67P/Churyumov-Gerasimenko through an interactive exhibition. Discover the science behind comets and the historic Philae lander touchdown. Relive this exceptional spaceflight adventure with multimedia content.

**Highlights:** Interactive comet model, Mission highlights and photographs, Historical background on comets, Rosetta mission science, Philae lander touchdown details, Personal stories from the mission

**Features:** macOS Compatibility

**In-app purchases:** none


### B777Q

[App page](https://appshunter.io/ios/app/b777q/id6474092521)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $3.99 | per year |


## Frequently asked questions

### Is DLR COMETS free?

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

### Is B777Q free?

B777Q is free to download, with in-app purchases available.

### Do DLR COMETS or B777Q have ads?

Neither DLR COMETS nor B777Q shows ads.

### Which is updated more often, DLR COMETS or B777Q?

DLR COMETS ships an update every 3 weeks, and B777Q every 3 weeks. Most recently, DLR COMETS was updated on September 8, 2026 and B777Q on September 23, 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.*