DLR COMETS vs B777Q
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DLR COMETS
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.
- Interactive comet model
- Mission highlights and photographs
- Historical background on comets
- Rosetta mission science
- Philae lander touchdown details
- Personal stories from the mission
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The European Rosetta mission arrived at Comet 67P/Churyumov-Gerasimenko in August 2014 after a 10-year journey through space. Three months later, the Philae robotic lander touched down on the comet – the first probe to do so in the history of humankind. It was a fantastic scientific adventure and an exceptional spaceflight project. The German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) takes you on a journey to the origins of the Solar System with this exhibition app “DLR COMETS - The Rosetta mission: Journey to the origin of the Solar System”. The centrepiece of the exhibition is a model of comet 67P/Churymov-Gerasimenko based on data from Rosetta’s OSIRIS camera system, surrounded by backlit photographs of the comet and mission highlights. Additionally to the historical and technical background on comets as important building blocks of the Solar System, the Rosetta mission and its scientific achievements to date, the exhibition includes film-clips highlighting the personal stories of the men and women that made Rosetta a reality and the deep emotions evoked by involvement in the mission.
B777Q
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Prepare for your Boeing 777 type rating with B777Q, a study app for testing your knowledge of the B777. I built B777Q while preparing for my own type rating exam. It's meant for training only and is not affiliated with or endorsed by Boeing or any airline. Always use your official documentation as reference. WHAT'S INSIDE • 500+ multiple-choice questions, each with its FCOM reference • Limitations quiz • Memory items • Maneuvers • Searchable abbreviations list • Built-in question bank that also works without internet STUDY YOUR WAY • See your score as you go • Swipe between questions and review earlier answers • Report a question straight from the app Try the first subjects for free. Unlock everything with a subscription. SUBSCRIPTION • B777Q Full Access: 1 year, $5.99 (auto-renewing) • Payment is charged to your Apple Account when you confirm the purchase. • The subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. • You can manage your subscription or turn off auto-renewal in your Apple Account settings at any time after purchase. Cancellation takes effect at the end of the current period. Privacy Policy: https://appstimize.nl/privacy-policy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
DLR COMETS ships an update every 3 weeks, B777Q monthly. The most recent releases landed on November 2, 2026 and October 24, 2026 respectively.
| Parameter | DLR COMETS | B777Q |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 8.1 — better | 16.6 |
| Further details — not scored | ||
| Size | 416 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | DLR German Aerospace Center e.V. | Appstimize |
In-app purchases
DLR COMETS
No in-app purchases
B777Q
- Pro$3.991 Year









