Comparison

Discover Mars vs Space Telescope App

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

Head to head
About

Discover Mars

Explore stunning, high-definition images captured on Mars by NASA rovers. View the latest photos, zoom in for detail, and learn fascinating facts about the Red Planet's atmosphere, gravity, and temperature.

Highlights
  • View latest Mars rover images
  • Slideshow mode for full-screen viewing
  • Zoom into high-definition photos
  • Save images to your device
  • Explore Mars' atmosphere, gravity, and temperature
Features
Read full description

The Discover Mars app provides easy access to images taken on Mars by the NASA Mars rovers. - View the latest images taken on Mars by the Perseverance, Curiosity, Opportunity, and Spirit rovers. - Tapping on a photo launches it in slideshow mode to view the full high-definition image. You can double-tap to zoom into a photo or tap on the Share icon to save images directly onto your iPhone. - The Mars tab provides interesting visuals about Mars, such as its atmosphere, gravity, temperature, and much more. Designed by Spencer Everett Developed by Monte Thakkar

About

Space Telescope App

Explore the universe with real-time updates and stunning visuals from NASA's James Webb Space Telescope. Engage with expert insights, join community discussions, and test your knowledge with interactive quizzes. Discover distant galaxies and unlock the secrets of the early universe.

Highlights
  • Live mission updates
  • Breathtaking image gallery
  • Expert Q&A with astronomers
  • Community discussions
  • Interactive space quizzes
  • 3D solar system explorer
  • Exclusive wallpapers
Features
Read full description

Space Telescope is an astronomy app for people who actually go outside and look up. See what the James Webb Space Telescope is observing right now. Decide whether tonight is worth staying out for. Catch the next visible ISS pass over your own location, and follow the rocket launches coming up. WHAT WEBB IS LOOKING AT, RIGHT NOW Webb's current target, science category, proposal, instruments and scheduled times, refreshed every five minutes while the view is open. Tap through to the proposal or the full observation schedule. A REAL PLAN FOR METEOR NIGHT Most meteor apps hand you a peak date. This one tells you what you will actually see. Set your location and how dark your sky is, and get an honest meteors-per-hour range, the best viewing window, where to look, how much the Moon will wash out, and what 30, 60 or 90 minutes outside is likely to be worth. Two alerts that matter: a heads-up the evening before, and a nudge when your window opens. Cloud cover is not included, so check the weather before you commit. THE ISS, OVER YOUR HOUSE Live position, altitude, velocity and orbit, plus crew, expeditions, dockings and visiting vehicles. Seven days of passes for your location with quality, direction, peak elevation and duration - set a 10-minute alert or drop the pass straight into your calendar. LAUNCH DAY Upcoming launches with live countdowns, status, provider, rocket, pad, launch window and webcast link. One tap for a reminder 15 minutes before liftoff. GALLERIES WORTH SCROLLING Imagery and mission guides for James Webb, Hubble, Chandra, the Nancy Grace Roman Space Telescope, Artemis, Mars and the ISS. Follow Roman's countdown, instruments and journey to L2. Pinch to zoom, save, share, like and comment. Turn on alerts only for the galleries you care about. PICTURE OF THE DAY NASA's Astronomy Picture of the Day, image or video, with the full expert explanation and an optional daily alert. AND WHEN YOU WANT MORE - Tonight Sky: sunrise, sunset, Moon phase, illumination and twilight - Space Weather: Kp index, solar wind, aurora probability and active alerts - Cosmic Calendar: meteor showers, eclipses and other sky events - Exoplanets: discovery method and year, distance, orbit, mass, radius, temperature, host star and habitable-zone marker - Community astrophotography: post your own shots with gear and conditions - Space wallpapers for your phone - Quizzes, points, levels and global leaderboards - Ask an Astronomer, and live chat rooms in 10 languages - Full interface in English and Spanish PREMIUM Space Telescope is free, with ads. Premium removes every ad, unlocks the premium wallpaper collection and adds a gold avatar ring. Choose a monthly or annual subscription, or pay once for lifetime access, which also grants 1,000,000 points and Diamond level straight away. Subscriptions are charged to your Apple Account and renew automatically unless auto-renew is turned off at least 24 hours before the current period ends. Manage or cancel in your Apple Account settings. Whether you follow Webb every day, plan a Perseids or Geminids watch, photograph the night sky, teach astronomy, or just want to know when the ISS will cross overhead, Space Telescope keeps the useful details in one place. Space Telescope is an independent astronomy app and is not affiliated with or endorsed by NASA, ESA, STScI, SpaceX or any launch provider. Data and imagery are credited to their respective sources. Privacy policy: https://jameswebbtracker.com/privacy-policy Terms of use (Apple standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Discover Mars3 screens
Space Telescope App4 screens

Verdict

The call

The clearest difference is review sentiment: Discover Mars at 100% against Space Telescope App's 40%. Discover Mars also leads on rating (5.0 vs 4.0) and in-app purchases (none vs 4). Space Telescope App's advantage is update cadence (every 10 days vs monthly). On price, ratings volume 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. Space Telescope App sells 4 in-app purchases, starting at $4.99 per month. Discover Mars asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Discover Mars holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 11 and 30 respectively. Written reviews point the same way: 100% of Discover Mars's written reviews are positive against 40% of Space Telescope App's.

UpkeepUpdate frequency

Discover Mars ships an update monthly, Space Telescope App every 10 days. The most recent releases landed on October 15, 2026 and October 21, 2026 respectively.

Scorecard7 real differences · 3 level
Discover Mars versus Space Telescope App: the parameters behind the verdict, then further details
ParameterDiscover MarsSpace Telescope App
PriceFreeFree
Rating5.0 (11 ratings) — better4.0 (30 ratings)
Positive reviews100.0% of reviews — better40.0% of reviews
Number of ratings1130 — better
Update frequencyMonthlyEvery 10 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size8 MB104 MB
Age rating4+4+
DeveloperManthan B ThakkarKAKHA GIORGASHVILI

Customer experience

Discover Mars

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Space Telescope App

All ratings30 ratings
Positive73.3%
Neutral6.7%
Negative20.0%
Written reviews30 reviews
Positive40.0%
Neutral10.0%
Negative50.0%

In-app purchases

None

Discover Mars

No in-app purchases

4 purchases

Space Telescope App

Subscriptions2
  • Monthly Ad-Free Plan$4.991 Month
  • Ad-Free Annual Access$29.991 Year
One-time2
  • Premium$2.99
  • Buy 1M Points$99.99

Questions

Is Discover Mars free?
Discover Mars is free to download, with no in-app purchases.
Is Space Telescope App free?
Space Telescope App is free to download, with in-app purchases available.
Which has better reviews, Discover Mars or Space Telescope App?
Discover Mars is rated higher. Discover Mars averages 5.0 out of 5 from 11 ratings, while Space Telescope App averages 4.0 from 30 ratings.
Do Discover Mars or Space Telescope App have ads?
Space Telescope App shows ads; Discover Mars does not.
Which is updated more often, Discover Mars or Space Telescope App?
Discover Mars ships an update monthly, and Space Telescope App every 10 days. Most recently, Discover Mars was updated on October 15, 2026 and Space Telescope App on October 21, 2026.

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