Hmmsim vs Rail World!
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Hmmsim
Experience realistic train operations on a mobile platform. This simulator offers high-quality graphics and allows users to play PC-based add-ons, providing endless route possibilities.
- Realistic metro operation
- High-level graphics
- BVE Trainsim add-on support
- Infinite add-on customization
- Seoulmetro Line 2 route
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Hmmsim, the first Train Simulation game ever built in Korea, has been realized in mobile. Hmmsim features basic route based on Seoulmetro Line 2, realized in the highest level of graphic. Experience the metro operation. Also, for the first time in mobile Train Simulation game, Hmmsim can add BVE Trainsim Add-Ons. In Hmmsim, you can play BVE routes as the same which you used to do in your PC. This is the first mobile Train Simulator that you can infinitely add Add-Ons depending on your preference. See www.jeminie.net for details.
Rail World!
Experience Japanese railways from multiple perspectives. Drive trains as the engineer, observe them like a miniature diorama, or enjoy the scenery as a passenger. This game offers diverse ways to engage with a virtual train world.
- Drive trains as engineer
- Diorama view
- Passenger view
- Explore 20km routes
- Future route/vehicle additions
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Drive the train as a driver. Look at the train like a diorama. Look out the train window as a passenger. This is a game that can be enjoyed in many different ways. Currently, you can drive within a 20km area. More routes and vehicles will be added in the future. Look forward to it!
Screenshots
Verdict
The clearest difference is rating: Rail World! at 4.9 against Hmmsim's 3.8. Rail World! also leads on update cadence (fortnightly vs every 5 months) and review sentiment (90% vs 70%). Hmmsim's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support 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. Rail World! sells 1 one-off in-app purchase. Hmmsim asks for nothing beyond the download.
Rail World! holds the better App Store score, 4.9 against 3.8. That said, the two scores are not equally well evidenced: Hmmsim has 168 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 70% of Hmmsim's written reviews are positive against 90% of Rail World!'s.
Hmmsim ships an update every 5 months, Rail World! fortnightly. The most recent releases landed on September 24, 2026 and September 26, 2026 respectively.
| Parameter | Hmmsim | Rail World! |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (168 ratings) | 4.9 (11 ratings) — better |
| Positive reviews | 69.8% of reviews | 90.1% of reviews — better |
| Number of ratings | 168 — better | 11 |
| Update frequency | Every 5 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 7.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 211 MB | 529 MB |
| Age rating | 4+ | 4+ |
| Developer | Jemin Hwang | Katsuya Maezono |
Customer experience
Hmmsim
Rail World!
Bugs and requests
Hmmsim
Reported bugs
3 issues- Play button not working
- Incompatibility with older devices
- Incorrect speed limit warnings
Requested features
5 requests- More routes and lines
- Ability to select different trains
- Scoring system based on timetable
- In-app route/addon downloads
- Loop the track for longer gameplay
Rail World!
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Hmmsim
No in-app purchases
Rail World!
- 早朝、夕方シナリオ$2.99
Questions
Is Hmmsim free?
Is Rail World! free?
Which has better reviews, Hmmsim or Rail World!?
Do Hmmsim or Rail World! have ads?
Which is updated more often, Hmmsim or Rail World!?
Other comparisons
