Comparison

Galaxy Map vs Terra

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Galaxy Map

Explore the Milky Way and Andromeda galaxies in an interactive 3D map. Discover nebulae, supernovae, and planets, with stunning visuals based on NASA data. Ideal for education and space enthusiasts.

Highlights
  • Interactive 3D galaxy map
  • Explore nebulae and supernovae
  • Fly through planetary atmospheres
  • Land on planets
  • Based on NASA data
  • Available in 100+ languages
Features
Read full description

The galaxy map is an interactive map of the Milky Way galaxy, Andromeda and their satellite galaxies. Explore the Orion Arm's nebulae and supernovae from the comfort of your spaceship. Fly through the atmosphere of Mars and many other planets and you can even land on them. Discover the galaxy in a stunning three dimensional map based on NASA's artistic impression of the Milky Way galactic structure. Photos are taken by NASA spacecraft and ground based telescopes like Hubble Space Telescope, Chandra X-Ray, Herschel Space Observatory and the Spitzer Space Telescope. This interactive 3D map is excellent for teachers to use for instruction, and it is a great astronomy resource for students to explore the Milky Way galaxy and space as they learn more about the universe we live in. Available in over 100 languages! You can also From the outskirts of the galaxy, in the Norma-Outer spiral arm to the galactic center's supermassive black hole Sagittarius A*, discover a galaxy full of amazing facts. Notable structures included: the Pillars of Creation, Helix Nebula, the Engraved Hourglass Nebula, the Pleiades, the Orion Arm (where the solar system and the Earth are located) with its Orion belt. Check out neighboring dwarf galaxies such as Sagittarius and the Canis Major Overdensity, stellar streams as well as internal galactic components such as a variety of nebulae, star clusters or supernovae. Explore space and get a little closer to our wonderful universe with this awesome astronomy app! The Galaxy Map requires internet access to retrieve information from the wiki.

About

Terra

Explore a 3D model of the NASA Terra satellite, its equipment, and data products. Learn about its functions, instruments, and Earth observation capabilities through interactive simulations and visualizations.

Highlights
  • Interactive 3D satellite model
  • Detailed instrument information
  • Simulated satellite flybys
  • MODIS instrument visualization
  • ASTER data product display
  • Earth observation data
Features
Read full description

Global design of the NASA Terra satellite, represented along with its equipment and some data products. The application allows the user to interact with a 3D model of the NASA Terra satellite in order to learn the way it works, the payload and equipment present in the system, and the kind of data the satellite obtains to perform detailed observations of the Earth. Very useful to introduce in satellite development and EOS missions. The application is composed of the following interactive sections: * Flyby: Simulation of the overpass of the satellite. Time, distance and size proportions are completely real. The scene does not show the real position of the satellite. Actually, it will appear in a different and random part of the globe every time the scene is loaded. * Terra: 3D visualization of the satellite, where each instrument can be selected to get complete information about it. * MODIS: Simple 3D visualization of the Terra MODIS instrument, where every component has been identified. * Products: Visualization of processed data acquired by the Terra ASTER instrument. The area belongs to Monfragüe National Park (Spain), and it can be observed using different band combinations, which allow to highlight certain characteristics. The scene also presents a simulation of an user login procedure to download the original satellite products. NOTE: This is NOT an official NASA application. All the information has been collected from official publications. CREDITS: The original Terra mission is currently being developed by NASA. This institution owns the rights over the official and original design of the satellite, payload and data product types. The 3D adaptation of the satellite has been performed using official NASA sources and belongs to Himalaya Computing. The Milky Way background was generated by ESO.

Screenshots

Galaxy Map4 screens
Terra4 screens

Verdict

The call

The clearest difference is in-app purchases: Terra at none against Galaxy Map's 13. Terra also leads on ads (none vs shown) and rating (5.0 vs 4.6). Galaxy Map's advantage is ratings volume (609 vs 1) and update cadence (monthly vs every 3 months). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Galaxy Map sells 13 one-off in-app purchases. Terra asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Terra holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Galaxy Map has 609 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 80% of Galaxy Map's written reviews are positive against 100% of Terra's.

UpkeepUpdate frequency

Galaxy Map ships an update monthly, Terra every 3 months. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

Scorecard8 real differences · 2 level
Galaxy Map versus Terra: the parameters behind the verdict, then further details
ParameterGalaxy MapTerra
PriceFreeFree
Rating4.6 (609 ratings)5.0 (1 ratings) — better
Positive reviews79.8% of reviews100.0% of reviews — better
Number of ratings609 — better1
Update frequencyMonthly — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.08.0 — better
Further details — not scored
Size632 MB160 MB
Age rating4+4+
DeveloperAndrei NistorescuHimalaya Computing

Customer experience

Galaxy Map

All ratings609 ratings
Positive91.1%
Neutral3.9%
Negative4.9%
Written reviews104 reviews
Positive79.8%
Neutral6.7%
Negative13.5%

Terra

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Galaxy Map

Reported bugs

9 issues
  • App crashes on startup
  • Explore button shows nothing
  • Pinch-to-zoom doesn't work
  • App won't load on iPad
  • Text displays as boxes in language settings
Show 4 more
  • Mars moon orbital speed incorrect
  • App kicks users out during exploration
  • Loading issues and incomplete functionality
  • Inconsistent performance across platforms

Requested features

18 requests
  • Search button to find galaxies and objects
  • More diverse and realistic black hole designs
  • AR feature to identify stars/planets in real sky
  • More free content and objects
  • Exoplanet additions (TRAPPIST-1e, J1407B)
Show 13 more
  • Ability to click on stars within galaxies for details
  • Generated planets around stars
  • Sandbox/creation mode for user-generated content
  • Animation for Milky Way and Andromeda
  • More galaxy variety in the app
  • Coordinates filter for objects
  • Space-Engine style gameplay
  • Flying through galaxies feature
  • More female character customization options
  • VIP version option
  • Brown dwarfs addition
  • Photosphere viewing mode
  • More detailed star information

Terra

Not enough reviews yet to summarise bugs or requests.

In-app purchases

13 purchases

Galaxy Map

One-time13
  • Buy ship - Alien Destroyer$0.99
  • Buy ship - Alien fighter$0.99
  • Remove ads$1.99
Show 10 more
  • Buy ship - Alien Destroyer$1.99
  • Buy ship - Alien fighter$1.99
  • 3D Visualization Pack$1.99
  • Buy ship - Dragon Frigate$1.99
  • Essentials bundle - SALE$2.99
  • Remove ads$3.99
  • 3D Visualization Pack$3.99
  • Ultimate bundle - SALE$4.99
  • Essentials bundle$4.99
  • Ultimate bundle$8.99
None

Terra

No in-app purchases

Questions

Is Galaxy Map free?
Galaxy Map is free to download, with in-app purchases available.
Is Terra free?
Terra is free to download, with no in-app purchases.
Which has better reviews, Galaxy Map or Terra?
Terra is rated higher. Galaxy Map averages 4.6 out of 5 from 609 ratings, while Terra averages 5.0 from 1 ratings.
Do Galaxy Map or Terra have ads?
Galaxy Map shows ads; Terra does not.
Which is updated more often, Galaxy Map or Terra?
Galaxy Map ships an update monthly, and Terra every 3 months. Most recently, Galaxy Map was updated on October 16, 2026 and Terra on October 7, 2026.

Other comparisons