Mars Watch vs DiecastDB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Mars Watch
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.
- Mars Coordinated Time calculations
- Latest weather reports from Curiosity rover
- Images of Mars research probes
- Information on research projects
- Probe location time calculations
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Planning your next trip to Mars and need help keeping time? Need up to date weather reports for the Red Planet? Need to know coordinates for space junk on Mars so you can salvage it for scrap? Mars Watch has all of this information and slightly more in a mildly interesting but ultimately pointless app. Marvel for literally seconds at the myriad ways research missions to Mars have failed. Ponder for mere milliseconds over wether you have enough warm clothes to survive the significantly sub-zero temperature highs. Speculate about why the developer feels this is a valuable use of his time. Features --------- * Accurate time calculations for Mars Coordinated Time (sort of like GMT for Mars) * Most recent wether reports from the weather station on the Curiosity rover * Images of Mars research probes * Information on past and present research projects * Accurate time calculations for each probe's location Reviews for Mars Watch ------------------------ "I’m not terribly smart" ***** "Not very useful" ***** "I can’t understand why this app is receiving such high ratings!" * "Does what it's supposed to." ***** "Didn’t think I’d need it" ***** "it's not annoying" ****
DiecastDB
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.
- 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
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Search and manage your Diecast collection on the move. Thousands of Hot Wheels, Matchbox, MiniGT and many other brands already added to a fast growing database. All database models are first researched and verified before being added to the database, ensuring you have access to the highest quality data. If your model is not in our database, you can add your own and when we have been able to add it to our database, it will sync with your model and populate any missing information. Track what models you have, how much you paid and what you have sold them for. See average model values and view other members collections. Mark models in your collection for Trade or For Sale and keep track of them at all times. Add your own photos and document condition and storage details for each item. Add models to your Wish Lists with one click and keep track of the models you would like to add to your collection.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Mars Watch | DiecastDB |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (85 ratings) — better | 2.2 (11 ratings) |
| Positive reviews | 82.2% of reviews — better | 57.1% of reviews |
| Number of ratings | 85 — better | 11 |
| Update frequency | Every 6 weeks — better | Every 16 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 19 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthew Flint | Redline Diecasts Limited |
Customer experience
Mars Watch
DiecastDB
Bugs and requests
Mars Watch
Reported bugs
5 issues- 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
7 requests- Add Perseverance Rover
- Make an Apple Watch app
- Add Darian calendar
- Info on next close approach/opposition
- Add AM/PM or 12-hour format
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- Wide view of the planet
- Add Mars2020 (Perseverance)
DiecastDB
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mars Watch
No in-app purchases
DiecastDB
No in-app purchases






