Comparison

NASA SpaceTime vs ISS Tracker

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

Head to head
About

NASA SpaceTime

Track the current time on Mars for NASA's Perseverance and Curiosity rovers. View mission event schedules and operational meetings. Supports Siri integration for quick time queries.

Highlights
  • Mars time display
  • Earth time display
  • Rover mission schedules
  • Operational meeting views
  • Siri integration
Read full description

Display Mars and Earth time for the NASA Perseverance and Curiosity Mars rovers. View the schedule of events and operational meetings in support of these missions.  Ask Siri: "What Sol is it on Mars?"

About

ISS Tracker

Monitor the International Space Station's live position and vital telemetry data in real-time. Track its orbit, altitude, velocity, and internal environmental systems. Ideal for space enthusiasts and students interested in space exploration.

Highlights
  • Real-time ISS position tracking
  • Interactive world map
  • Altitude and velocity data
  • Comprehensive telemetry monitoring
  • Environmental and power system data
  • Dark mode support
Features
Read full description

Find out when the International Space Station flies over you and exactly where to look. On a good night it’s brighter than any star. YOUR NEXT PASS, IN PLAIN WORDS “Tonight at 8:05 PM. Look west, low.” Each pass also says how long it’s visible and how bright it is, and has a round sky chart that shows its path, from where it appears to where it fades. See 14 days of passes, and the cloud forecast for the next ones. ALERTS FOR GOOD PASSES Get a heads-up a few hours before a good pass, and an alert 5 minutes before it starts. A good pass climbs at least 30° above the horizon, or is bright and long. If two weeks have none, you get alerts for the best low passes instead. You can turn on alerts for every visible pass in the app’s settings. A Live Activity counts down on your Lock Screen and in the Dynamic Island. FIND IT IN THE SKY Hold your phone up and follow the pointer to the station. Saw a bright, moving light? Ask “Was that the ISS?” and get a straight answer. No telescope needed. WHERE IS THE ISS RIGHT NOW? See it on a 3D globe, with the day and night sides of Earth, or on a live map with the ground track of its orbit. You can add Tiangong, China’s space station, and get its passes too. WHO’S UP THERE See the crew on board, and the next launches, dockings and spacewalks. ALWAYS ONE GLANCE AWAY Widgets show your next pass on the Home Screen and Lock Screen. A Control Center button opens the sky pointer. PRIVATE AND SIMPLE No account needed. Every pass is worked out on your phone, and your exact location is never sent to us. Apple Weather and Apple Maps use it for the cloud forecast and the place name. For iPhone and iPad.

Screenshots

NASA SpaceTime3 screens
ISS Tracker4 screens

Verdict

The call

The clearest difference is update cadence: ISS Tracker at weekly against NASA SpaceTime's every 4 weeks. NASA SpaceTime's advantage is rating (5.0 vs 4.7) and device support (5 vs 2). On price, review sentiment, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

NASA SpaceTime holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 7 and 19 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

NASA SpaceTime ships an update every 4 weeks, ISS Tracker weekly. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
NASA SpaceTime versus ISS Tracker: the parameters behind the verdict, then further details
ParameterNASA SpaceTimeISS Tracker
PriceFreeFree
Rating5.0 (7 ratings) — better4.7 (19 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings719 — better
Update frequencyEvery 4 weeksWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod, Mac, Apple Watch — betteriPhone, iPad
Requires iOS14.0 — better26.0
Further details — not scored
Size38 MB15 MB
Age rating4+4+
DeveloperJet Propulsion LaboratoryLucent Enterprises Ltd.

Customer experience

NASA SpaceTime

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

ISS Tracker

All ratings17 ratings
Positive94.1%
Neutral0.0%
Negative5.9%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

NASA SpaceTime

No in-app purchases

None

ISS Tracker

No in-app purchases

Questions

Is NASA SpaceTime free?
NASA SpaceTime is free to download, with no in-app purchases.
Is ISS Tracker free?
ISS Tracker is free to download, with no in-app purchases.
Which has better reviews, NASA SpaceTime or ISS Tracker?
NASA SpaceTime is rated higher. NASA SpaceTime averages 5.0 out of 5 from 7 ratings, while ISS Tracker averages 4.7 from 19 ratings.
Do NASA SpaceTime or ISS Tracker have ads?
Neither NASA SpaceTime nor ISS Tracker shows ads.
Which is updated more often, NASA SpaceTime or ISS Tracker?
NASA SpaceTime ships an update every 4 weeks, and ISS Tracker weekly. Most recently, NASA SpaceTime was updated on October 20, 2026 and ISS Tracker on October 24, 2026.

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