Planet Gravity vs Captain’s Log
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Planet Gravity
Engage in a physics-based game simulating asteroid flight and solar system creation. Complete missions to explore the universe and pass the time. Discover other titles for freeform universe building.
- Physics-based gameplay
- Asteroid simulation
- Solar system creation
- Level-based missions
- Universe exploration
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"Planet Gravity" is a physical base game. We simulate asteroids flying over space. And create the solar system step by step. On each level, we will have some missions for you to finished. The goal of this game is increase your interesting on universe and helping you to the pass the time. And if you want to create the universe on your own freely, we have two games suggested to you. Find "myDream Universe" or "Sandbox Planet" on Appstore.
Captain’s Log
This app transforms your device into a futuristic command center for space exploration fans. It offers tools for date conversion, 3D starship viewing, personal logging, and engaging quizzes, all within a sci-fi interface. Enjoy offline access and customization for an immersive experience.
- Stardate Converter with custom epochs
- 3D Starship Viewer with AR previews
- Captain & Crew Profile creation
- Personal Captain's Log with Markdown
- Memory Card Simulator challenges
- Dynamic Galactic Quiz
- Daily Mission Engine for habit tracking
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Captain's Log: Stardate is a Star Trek–inspired sci-fi command center for captain logs, stardate conversion, 3D starships, Academy simulations, Star Chart missions, space journals, memory games, quiz challenges, Dilithium rewards, Latinum unlocks, ranks, badges, and Starfleet-style roleplay. Search captain log, stardate app, Star Trek logbook, Starfleet bridge, space journal, sci-fi diary, starship game, Kobayashi Maru training, or galaxy logbook—your command console is ready. Turn your device into a futuristic captain's console. Record milestones as mission logs, convert calendar dates into stardates, explore detailed 3D starship models, run Academy command simulations, plot courses on the Star Chart, browse the scenario Archive, complete daily missions, play memory and quiz games, earn Dilithium and Latinum, unlock command ranks, and build your own Star Trek–inspired space diary. Made for Star Trek fans, sci-fi writers, RPG players, and space explorers. STARDATE CONVERTER Convert calendar dates into stardates with a clean galactic date tool. Ideal for Star Trek worldbuilding, RPG notes, fan logs, timelines, and sci-fi writing. CAPTAIN'S LOG & SPACE JOURNAL Write daily captain logs, mission notes, personal reflections, achievements, creative entries, and fictional expedition records. A starship-inspired interface makes your sci-fi diary feel like a real Starfleet command archive. ACADEMY COMMAND SIMULATIONS Train with Star Trek–inspired Academy scenarios—including Kobayashi Maru–style no-win tests, ethical crises, engineering emergencies, diplomacy, and tactical uncertainty. Brief, decide under pressure, debrief, explore the Star Chart and Archive, and fly your duty ship from the Fleet Hangar. 3D STARSHIP HANGAR & COLLECTION Explore 3D starships in a premium hangar. Rotate, zoom, inspect, and collect ships, sounds, and cosmetics. Unlock vessels with Dilithium or Latinum for Academy warp approaches—great for Star Trek fleets and starship fans. DAILY MISSIONS Complete daily space missions and command objectives. Build habits, return to your logbook, and collect rewards on a Starfleet-style duty roster. MEMORY GAME & GALACTIC QUIZ Train focus with a sci-fi memory card game and themed decks, then tackle astronomy and starship trivia. Earn badges and prove your Starfleet knowledge. DILITHIUM, LATINUM & RANKS Earn Dilithium and Latinum, unlock achievements, and rise through command ranks—a lightweight space RPG, habit tracker, and Star Trek captain simulator. WHY YOU'LL LOVE IT • Stardate converter for space timelines and creative logs • Captain's logbook for journaling and mission notes • Academy simulations, Star Chart, and scenario Archive • Kobayashi Maru and command-crisis training • 3D starships, Fleet Hangar, and collectible content • Daily missions for habits and motivation • Memory game and quiz for focus and trivia • Dilithium, Latinum, ranks, badges, and rewards • Premium UI inspired by Star Trek / Starfleet consoles • Offline-friendly journal for logging anywhere • Built for Star Trek fans, writers, RPG players, and space lovers USE IT YOUR WAY Log achievements as missions, turn any day into a stardate entry, run Academy simulations, plan voyages, play memory challenges, test sci-fi knowledge, explore starships, and earn rewards. PREMIUM COMMAND ACCESS Start free. Premium / Pro unlocks sealed Academy scenarios, customization, rewards, expanded starship content, and a richer Star Trek–inspired command experience. Optional in-app purchases may apply. BEGIN YOUR COMMAND Download Captain's Log: Stardate to convert stardates, write logs, run Academy simulations, explore 3D starships, play games, earn Dilithium, unlock ranks, and take the bridge. Live the Star Trek fantasy on your personal starship bridge every day—log, train, explore, and command. Bring Star Trek energy to every log and simulation. Privacy Policy: https://cevik10.github.io/privacy.html Terms of Use: https://cevik10.github.io/terms.html
Screenshots
Verdict
The clearest difference is review sentiment: Captain’s Log at 100% against Planet Gravity's 44%. Captain’s Log also leads on price (Free vs $11.00) and rating (5.0 vs 4.2). Planet Gravity's advantage is ratings volume (54 vs 2) and iOS requirement (15.6 vs 17.0). On in-app purchases 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
Captain’s Log is free to download; Planet Gravity costs $11.00 up front. Planet Gravity sells 1 one-off in-app purchase and Captain’s Log sells 6 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Captain’s Log holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Planet Gravity has 54 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 44% of Planet Gravity's written reviews are positive against 100% of Captain’s Log's.
Planet Gravity ships an update every 4 months, Captain’s Log monthly. Both last shipped on October 15, 2026.
| Parameter | Planet Gravity | Captain’s Log |
|---|---|---|
| Price | $11.00 | Free — better |
| Rating | 4.2 (54 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 44.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 54 — better | 2 |
| Update frequency | Every 4 months | Monthly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 108 MB | 117 MB |
| Age rating | 4+ | 4+ |
| Developer | Oscar Tsang | Hakan Cevik |
Customer experience
Planet Gravity
Captain’s Log
In-app purchases
Planet Gravity
- Golden Pass$2.99
Captain’s Log
- Monthly Premium$4.991 Month
- Yearly Premium7 Days trial$29.991 Year
- 80 Dilithium$0.99
- 500 Dilithium$2.99
- 1200 Dilithium$3.99
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- 2500 Dilithium$7.99









