Mars Book vs ReactorN
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Mars Book
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The Mars Book is an app that is dedicated for observing Mars which will make close approach in summer 2020. Mars will come close to Earth from September 2020 through October 2020. Closest approach will take place on October 6, 2020. Mars Book is a highly useful Mars observing app which will indicate the location of Mars visible in the sky. It shows you why Mars Close Approach will take place, and it is explained readily using animated illustrations and star charts at a viewpoint from outer Space. Mars Close Approaches taking place 23 times from the year 2003 through 2050 will be displayed and apparent retrograde motion of Mars will be displayed. Enjoy Mars Close Approach this summer with the Mars Book app!
ReactorN
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Reactor N is a free way for students and the nuclear-curious to explore the U.S. nuclear industry โ built to help with your studies, coursework, and thesis. WHAT YOU CAN DO โ ALL FREE โข Browse all 94 U.S. nuclear reactors in one place โ status, location, and key facts โข Explore the energy-vs-AI-datacenter demand story reshaping the grid (the convergence layer) โข Follow live regulatory activity (NRC + Federal Register) โข Check energy market data (EIA) โข Ask the AI copilot questions about the U.S. nuclear fleet โข Prep for the reactor operator certification exam โ flashcards, quizzes, and progress tracking BUILT FOR STUDENTS Whether you study nuclear engineering, energy, policy, or finance, Reactor N gives you real industry data instead of a textbook โ useful for class projects, presentations, thesis research, and studying for the reactor operator (RO/SRO) licensing exam. Data is drawn from public sources (NRC, EIA, U.S. Federal Register) so you can trace and cite it. EVERYTHING IS FREE No account required. No subscription. No paywall. Nothing is sold in, through, or in connection with the app. Open the app and explore. ABOUT Reactor N is an independent product from OpenAgent. It aggregates publicly available information for educational and informational purposes only, and is not affiliated with or endorsed by the U.S. Nuclear Regulatory Commission, the U.S. Energy Information Administration, or any utility or reactor operator. All trademarks belong to their respective owners. Privacy Policy: https://openagent-legal.vercel.app/reactorn/privacy
Screenshots
Verdict
The clearest difference is iOS requirement: Mars Book at 9.0 against ReactorN's 17.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Mars Book | ReactorN |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 13 months | โ |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod โ better | iPhone, iPad |
| Requires iOS | 9.0 โ better | 17.0 |
| Further details โ not scored | ||
| Size | 14 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Vixen Co.,Ltd. | TYH DANIEL MC LEAN |
In-app purchases
Mars Book
No in-app purchases
ReactorN
No in-app purchases









