Comparison

NASA SpaceTime vs NAPA

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

NAPA

Explore the night sky with this astronomy and planetarium app. Identify stars, constellations, and planets by pointing your device at the sky. Plan future observations by adjusting the time and date.

Highlights
  • Point and observe celestial objects
  • Star map functionality
  • Time adjustment for observation planning
  • Simulate planet positions
  • Locate specific celestial objects
  • Real images of deep sky objects
Features
Read full description

NAPA - Star Map NARIT Astronomy & Planetarium Application, or “NAPA” is an astronomy and planetarium app that will help guide you to the night sky. Identify those dots in the sky. Learn about stars, constellations, planets, and other deep sky objects by simply pointing your phone at the sky. Adjust the time and NAPA can be used as a star map to help plan your future observation. Familiarize yourself and learn more about the patterns that make up the night sky. Select and use NAPA to locate deep sky objects that you can locate with a binocular or small telescope. NAPA is made by professional and amateur astronomers, along with public outreach professionals with the aim to help bridge the gap, making astronomy accessible to everyone. This app is made free to use with the aim to assist schoolteachers and public outreach personnels with their engagement with the public. Unlock the pro version (coming soon) to access the full potential of this app. Turn your phone into powerful tools that can help you with your observation and stargazing events with features that will assist in your astronomical needs. NAPA features: • Point and observe: Display the celestial objects in the position of the sky that your smart device is pointing at. • Point and drag the screen to turn this app into a star map. • Adjust the time to plan your observations at any given date and time. • Simulate the positions of planets that you can see at any time. • Select constellations, planets, or deep sky objects of interest and locate its position in the sky. • Real images of deep sky objects

Screenshots

NASA SpaceTime3 screens
NAPA4 screens

Verdict

The call

The clearest difference is rating: NASA SpaceTime at 5.0 against NAPA's 4.5. NASA SpaceTime also leads on review sentiment (100% vs 75%) and update cadence (every 4 weeks vs every 2 months). NAPA's advantage is iOS requirement (12.0 vs 14.0). On price, ratings volume, ads and in-app purchases 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 4.5. Both are backed by a comparable volume of ratings — 7 and 4 respectively. Written reviews point the same way: 100% of NASA SpaceTime's written reviews are positive against 75% of NAPA's.

UpkeepUpdate frequency

NASA SpaceTime ships an update every 4 weeks, NAPA every 2 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

Scorecard5 real differences · 5 level
NASA SpaceTime versus NAPA: the parameters behind the verdict, then further details
ParameterNASA SpaceTimeNAPA
PriceFreeFree
Rating5.0 (7 ratings) — better4.5 (4 ratings)
Positive reviews100.0% of reviews — better75.0% of reviews
Number of ratings7 — better4
Update frequencyEvery 4 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod, Mac, Apple Watch — betteriPhone, iPad, iPod
Requires iOS14.012.0 — better
Further details — not scored
Size38 MB287 MB
Age rating4+4+
DeveloperJet Propulsion LaboratoryNational Astronomical Research Institute of Thailand (Public Organization)

Customer experience

NASA SpaceTime

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

NAPA

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive75.0%
Neutral25.0%
Negative0.0%

In-app purchases

None

NASA SpaceTime

No in-app purchases

None

NAPA

No in-app purchases

Questions

Is NASA SpaceTime free?
NASA SpaceTime is free to download, with no in-app purchases.
Is NAPA free?
NAPA is free to download, with no in-app purchases.
Which has better reviews, NASA SpaceTime or NAPA?
NASA SpaceTime is rated higher. NASA SpaceTime averages 5.0 out of 5 from 7 ratings, while NAPA averages 4.5 from 4 ratings.
Do NASA SpaceTime or NAPA have ads?
Neither NASA SpaceTime nor NAPA shows ads.
Which is updated more often, NASA SpaceTime or NAPA?
NASA SpaceTime ships an update every 4 weeks, and NAPA every 2 months. Most recently, NASA SpaceTime was updated on November 3, 2026 and NAPA on November 4, 2026.

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