# Mars Watch vs DiecastDB

The clearest difference is rating: Mars Watch at 4.5 against DiecastDB's 2.2. Mars Watch also leads on ads (none vs shown) and update cadence (every 6 weeks vs every 16 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Mars Watch holds the better App Store score, 4.5 against 2.2. That said, the two scores are not equally well evidenced: Mars Watch has 85 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 82% of Mars Watch's written reviews are positive against 57% of DiecastDB's.

Mars Watch ships an update every 6 weeks, DiecastDB every 16 months. The most recent releases landed on September 28, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Mars Watch | DiecastDB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (85 ratings)](https://appshunter.io/ios/app/mars-watch/id1221014167/reviews)** | [2.2 (11 ratings)](https://appshunter.io/ios/app/diecastdb/id1644711318/reviews) |
| Number of ratings | **85** | 11 |
| Positive reviews | **82.2% of reviews** | 57.1% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 16 months |
| Monetization | **Free** | Ad-supported |
| Size | 19 MB | 15 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Matthew Flint](https://appshunter.io/developer/675292607) | [Redline Diecasts Limited](https://appshunter.io/developer/1644711320) |

## What reviewers say

### Mars Watch

[App page](https://appshunter.io/ios/app/mars-watch/id1221014167)

This app provides current time and weather data for Mars, including information on research probes and projects. It offers time calculations for Mars Coordinated Time and probe locations, along with weather reports from the Curiosity rover.

**Highlights:** Mars Coordinated Time calculations, Latest weather reports from Curiosity rover, Images of Mars research probes, Information on research projects, Probe location time calculations

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Informative and educational
- 🚀 Great for space enthusiasts
- ✨ Stunning photos and visuals
- 🧭 Accurate Mars timekeeping
- ☀️ Local Martian weather updates

**What reviewers complain about**

- ⏳ Outdated information (Insight Lander)
- 🐛 Weather data not updated
- 🐛 Watch complication freezes
- 🐛 App gets stuck in settings/credits
- 🤷‍♂️ Some find it pointless

**Reported bugs**

- Insight Lander information is outdated
- Mars weather hasn't been updated in over 30 days
- Apple Watch complication freezes and doesn't update
- Cannot get out of credits/settings mode
- Watch complication doesn't update time or temperature

**Requested features**

- Add Perseverance Rover
- Make an Apple Watch app
- Add Darian calendar
- Info on next close approach/opposition
- Add AM/PM or 12-hour format


### DiecastDB

[App page](https://appshunter.io/ios/app/diecastdb/id1644711318)

Manage your diecast car collection with this app. Track owned, sold, and desired models, record purchase and sale prices, and view average values. Add your own photos and details for each item, and contribute missing models to the growing database.

**Highlights:** Manage diecast collections, Track owned, sold, and wish list models, Record purchase and sale prices, View average model values, Add custom photos and details, Contribute to a growing database

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mars Watch free?

Mars Watch is free to download, with no in-app purchases.

### Is DiecastDB free?

DiecastDB is free to download, with no in-app purchases.

### Which has better reviews, Mars Watch or DiecastDB?

Mars Watch is rated higher. Mars Watch averages 4.5 out of 5 from 85 ratings, while DiecastDB averages 2.2 from 11 ratings.

### Do Mars Watch or DiecastDB have ads?

DiecastDB shows ads; Mars Watch does not.

### Which is updated more often, Mars Watch or DiecastDB?

Mars Watch ships an update every 6 weeks, and DiecastDB every 16 months. Most recently, Mars Watch was updated on September 28, 2026 and DiecastDB on October 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*