# Mars-Clock — Timekeeping for Mars Missions

> Real-time NASA Mars mission data tracker for active rovers and landers. (iPhone/iPad app by SunlightAndTime.)

- Source: https://appshunter.io/ios/app/mars-clock/id1386514654 (this page in markdown: same URL + `.md`)
- Developer: [SunlightAndTime](https://appshunter.io/developer/531999172)
- Category: Utilities, Education
- Price: $0.99
- Rating: 3.50/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.3 · 33 MB
- Languages: American English
- Released: 2018-06-12
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/mars-clock/id1386514654/reviews.md

## What is Mars?

Mars-Clock displays accurate, real-time NASA Mars mission data making it a fun, informative, useful, and educational tool.

Currently active NASA Mars missions include: Curiosity Rover, InSight Lander, and Perseverance Rover.

The Mars 2020 Mission, Perseverance Rover, landed on Mars on February 18, 2021.

Information for each Mars Mission is displayed in a simple, easy-to-read format.
Features include:

-Mission Sol: Elapsed time of each mission in Sols (analogous to an Earth day)
-LMST: Local Mean Solar Time (used for mission time)
-Sunrise/sunset times for each mission
-LTST: Local True Solar Time. The time, used in some science applications, that is derived from solar noon. 
-MTC: Coordinated Mars Time — Analogous to Universal Coordinated Time (UTC) on Earth
-Earth-Mars distance: Real-time readout in miles or kilometers 
-Radio signal delay (one way between Earth and Mars. Real-time readout in minutes of signal delay


Mars-Clock has a simple, easy-to-navigate display:
-Tap the info button for a “Quick User Guide” (tap mission name on Apple Watch)
-Swipe left/right (Long press mission time on Apple Watch) in the large mission box to page through the active missions
-Tap “Earth-Mars Distance” to toggle between units of miles and kilometers
-Earth-Mars Distance display is blue when the distance is decreasing, and red when the distance in increasing

## Key features

- Mission Sol tracking
- Local Mean Solar Time (LMST)
- Sunrise/sunset times
- Coordinated Mars Time (MTC)
- Earth-Mars distance
- Radio signal delay

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/mars-clock/id1386514654/reviews.md

### 5/5 — Great

*2021-02-21*

In app swipe the mission box to move to the next one. Love the app and thanks for keeping it up to date.

### 2/5 — Can’t switch between mission clocks

*2021-02-18*

Please make it possible to switch between mission clocks in app as well. It does not state this for the app, only for iWatch it appears.

Otherwise grateful for the attempt to make this app possible.

**Developer response:** Sorry you are having trouble with the app. Switching between mission displays is different for the iPhone and the Apple Watch. On the phone you swipe left/right in the box at the top of the screen. On the watch you do a long press on the mission time. Click on the"I" button next to the app title at the top of the phone for additional information. I apologize for any confusion using the app.

## Frequently asked questions about Mars

### What is Mars-Clock?

Mars-Clock is a paid utility app that displays real-time data from active NASA Mars missions. It provides information such as mission sols, local solar time, and the distance between Earth and Mars.

### What active Mars missions does Mars-Clock track?

Mars-Clock currently tracks data for the Curiosity Rover, InSight Lander, and Perseverance Rover missions on Mars.

### What kind of time data does Mars-Clock provide?

Mars-Clock provides Mission Sol (elapsed time in Sols), Local Mean Solar Time (LMST), Local True Solar Time (LTST), and Coordinated Mars Time (MTC), analogous to UTC on Earth.

### How does Mars-Clock display Earth-Mars distance?

The app shows the real-time distance between Earth and Mars in miles or kilometers. The display color indicates whether the distance is increasing (red) or decreasing (blue).

### What devices does Mars-Clock support?

Mars-Clock is supported on Apple Watch, iPhone, and iPod devices.

### How often is Mars-Clock updated?

The latest version of Mars-Clock is 1.6, which was last updated on September 30, 2021. This suggests a relatively infrequent update cycle.

### What is the user rating for Mars-Clock?

Mars-Clock has a rating of 3.5 stars based on 2 user ratings, indicating mixed user sentiment.

### Does Mars-Clock have ads?

No, Mars-Clock does not contain advertisements. It is a paid application with no in-app purchases or ads.

## Version history (last 5 releases)

### 1.6 — 2021-09-30

Version 1.6

- Update for iOS 15 and WatchOS 8

### 1.5 — 2021-02-22

Version 1.5

- Perseverance Mission Time (Sol) was synchronized to NASA mission data
- Added explanations for Mars time terminology used in the app
- Fixed a few minor bug and formatting errors

### 1.4 — 2021-02-12

- Perseverance Rover "Countdown to Landing" time has been updated using NASA's revised landing time.
- Fixed a couple of minor bugs.

### 1.3 — 2020-10-28

-updates for iOS 14.
-added a countdown timer for the en route Perservance Rover scheduled to land on Mars in February 2021. Double tap the Perseverance Mission Clock Time to toggle between the countdown timer and the Mission Clock Time. After landing, the display will automatically revert to Local Mars Mission Clock Time only.

### 1.2 — 2020-05-16

-Opportunity Rover mission has ended and was removed from the app. Last communication from rover was June 10, 2018. Final attempt to restore communication was February 13, 2019.

-Mission data for the NASA Mars Mission 2020, Perseverance Rover, currently in pre-launch status, has been added to the app. The launch window is July 17 to August 5, 2020 with a scheduled Mars landing on February 18, 2021.

-App updated for iOS 13 and watchOS 6.

## Apps similar to Mars

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [heatapp!](https://appshunter.io/ios/app/heatapp/id892778632) | — | Free | Utilities |
| [Note Widget](https://appshunter.io/ios/app/note-widget/id885133036) | 4.4 (31) | $0.99 | Utilities |
| [JEDA Live 職達](https://appshunter.io/ios/app/jeda-live/id1476523220) | — | Free | Utilities |
| [MyConcordNH](https://appshunter.io/ios/app/myconcordnh/id1546622018) | 4.8 (14) | Free | Utilities |
| [++Calc - Time Calculator](https://appshunter.io/ios/app/plus-plus-calc-time-calculator/id6478706000) | — | Free | Utilities |
| [Lost Calc](https://appshunter.io/ios/app/lost-calc/id1514949517) | 5.0 (1) | Free | Utilities |

## More apps by SunlightAndTime

- [The-Timer](https://appshunter.io/ios/app/the-timer/id1563305814)

All apps by SunlightAndTime: https://appshunter.io/developer/531999172

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*