Project Planet Space vs CosmoMerge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Project Planet Space
Explore our solar system with an interactive map. Discover planetary gravity, temperatures, and atmospheric data. Calculate your weight on other worlds and learn fascinating space facts.
- Interactive solar system map
- Personalized weight and age calculations
- Detailed planetary data widgets
- Multi-language support
- Metric/Imperial unit switching
- Cosmic museum aesthetic
- Real astronomical data integration
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Project Planet - an interactive map of our solar system How much would you weigh on Jupiter? Why does a day on Mercury last longer than its year? Project Planet turns space facts into a fingertip-sized journey. Scroll through all nine planets (Pluto included), feel each world's pull on your own body, and explore the numbers astronomers have spent decades collecting. Highlights - Sticky scroll across the system: from Mercury to Pluto, each planet stays centred long enough for you to take it in. - You, on every world: enter your weight and age once and watch them recalculated by each planet's gravity and orbital period. - Five rich widgets per planet: surface temperature with reference markers (Antarctica, freezing, boiling), atmospheric pressure with composition chart, travel times from Earth from walking up to the speed of light, gravitational force with everyday objects (phone, backpack, car), and an interactive pressure simulator with phase changes for water, oxygen, CO2, hydrogen, nitrogen and mercury (Antoine equation under the hood). - Six languages: Czech, English, German, Slovak, Spanish and French, auto-detected from your device. - Metric or imperial: switch instantly; weights, temperatures and distances follow your preference. - Crafted to feel like a small cosmic museum: dark cosmic theme, hand-tuned typography, subtle scroll choreography, and a right rail that lets you jump to any planet. - Built on real data: gravitational accelerations, orbital periods, NASA mean temperatures, atmospheric compositions and substance phase transitions. Requires an internet connection. The app runs as a continuously updated webview and uses native iOS capabilities such as haptic feedback to add a tactile dimension to your interstellar journey.
CosmoMerge
Explore astronomy, geography, and history by merging tiles. Unlock knowledge and discover new entries in your atlas with each level you achieve. Enjoy a puzzle experience that educates and entertains.
- Merge tiles to unlock knowledge
- Explore Solar System, Geography, and History
- Atlas with descriptive entries
- Undo and Revive gameplay options
- Ad-free experience with purchase
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CosmoMerge — Explore Space & Civilization Through Puzzle Astronomy, geography, and history. Merge tiles, unlock knowledge. 【Gameplay】 Swipe to merge identical tiles and climb from the lowest to the highest level. Each milestone unlocks an entry in the atlas with brief descriptions. 【Topics】 • Solar System: From Neptune to the Sun — discover planets and our star • Geography: Islands, mountains, rivers — explore Earth’s landscapes • History: Chinese dynasties from Xia to Qing — trace the flow of time 【Features】 • Undo: Take back a move when you slip • Revive: Get another chance when the game ends • Ad-free: One-time purchase to remove all non-item ads For puzzle lovers and curious minds.
Screenshots
Verdict
The clearest difference is in-app purchases: Project Planet Space at none against CosmoMerge's 1. CosmoMerge's advantage is update cadence (every 2 days vs every 25 months). On price, rating, ratings volume and ads 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. CosmoMerge sells 1 one-off in-app purchase. Project Planet Space asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Project Planet Space against 5.0 for CosmoMerge. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Project Planet Space ships an update every 25 months, CosmoMerge every 2 days. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.
| Parameter | Project Planet Space | CosmoMerge |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 25 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 2 MB | 84 MB |
| Age rating | 4+ | 4+ |
| Developer | Miroslav Hanzelka | Qingdao Chuyan Technology Co., Ltd |
In-app purchases
Project Planet Space
No in-app purchases
CosmoMerge
- Remove Ads$1.99
Questions
Is Project Planet Space free?
Is CosmoMerge free?
Which has better reviews, Project Planet Space or CosmoMerge?
Do Project Planet Space or CosmoMerge have ads?
Which is updated more often, Project Planet Space or CosmoMerge?
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