# Hmmsim Legacy vs Red Flag Sim

The clearest difference is in-app purchases: Hmmsim Legacy at none against Red Flag Sim's 3. Red Flag Sim's advantage is update cadence (every 3 days vs fortnightly) and review sentiment (87% vs 77%). On rating, ratings volume, ads and device support there is nothing between them.

Hmmsim Legacy costs $1.99 and Red Flag Sim $0.99 up front. Red Flag Sim sells 3 one-off in-app purchases. Hmmsim Legacy asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.5 for Hmmsim Legacy against 4.6 for Red Flag Sim. Both are backed by a comparable volume of ratings — 109 and 83 respectively. Written reviews are what separate them: 77% of Hmmsim Legacy's written reviews are positive against 87% of Red Flag Sim's.

Hmmsim Legacy ships an update fortnightly, Red Flag Sim every 3 days. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Hmmsim Legacy | Red Flag Sim |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| Rating | [4.5 (109 ratings)](https://appshunter.io/ios/app/hmmsim-legacy/id1000884506/reviews) | **[4.6 (83 ratings)](https://appshunter.io/ios/app/red-flag-sim/id6740720825/reviews)** |
| Number of ratings | **109** | 83 |
| Positive reviews | 76.6% of reviews | **87.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | #137 | **#17** |
| Size | 359 MB | 1.4 GB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Jemin Hwang](https://appshunter.io/developer/863234167) | [畅 刘](https://appshunter.io/developer/383381901) |

## What reviewers say

### Hmmsim Legacy

[App page](https://appshunter.io/ios/app/hmmsim-legacy/id1000884506)

**Currently charting:** #137 Top Paid · Racing (US App Store)

Experience realistic train simulation with advanced graphics and new features. Drive on detailed subway routes and operate trains with dynamic elements. Expand your gameplay by adding custom content from PC simulators.

**Highlights:** Advanced graphics, New map and outer view, Dynamic trains, Scoring mode, BVE Add-On operation upgrade, Seoul Subway Line 2 & 7 routes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🎨 Excellent graphics and visual detail
- 🚂 Realistic train simulation mechanics
- 📱 Works well on mobile devices
- 🎮 Engaging gameplay experience
- 🔧 Supports BVE add-ons and route conversion

**What reviewers complain about**

- 😤 Extremely difficult add-on installation process
- 📦 Limited default routes (only 2 included)
- 👥 No passenger simulation
- 🚪 Missing platform screen doors
- 🪟 No interior cabin view

**Reported bugs**

- Cannot download MTA routes on iPhone
- Routes fail to appear after app restart on iOS
- Add-ons not loading properly on iOS devices
- Transparency issues in converted BVE routes
- Ground clipping through tracks on some routes

**Requested features**

- Add more Seoul subway lines (Lines 1, 3, 4, 5, 6, 8, 9)
- Implement passenger boarding/alighting simulation
- Add interior cabin view with controls
- Include platform screen doors
- Add express service routes


### Red Flag Sim

[App page](https://appshunter.io/ios/app/red-flag-sim/id6740720825)

**Currently charting:** #17 Top Paid · Racing, #104 Top Paid · Simulation (US App Store)

Experience a deep military aviation simulator on mobile, featuring realistic flight physics, complex avionics, and engaging combat. Learn to operate fighter jets, manage energy, and employ weapons through training missions or create your own scenarios.

**Highlights:** Realistic flight dynamics, In-depth F-15C simulation, Complex radar and avionics, Training and quick missions, Tactical mission editor, Evolving independent project

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 200 Fox Token | $1.99 | one-time |
| 450 Fox Token | $3.99 | one-time |
| 1000 Fox Token | $7.99 | one-time |


## Frequently asked questions

### Is Hmmsim Legacy free?

Hmmsim Legacy costs $1.99, with no in-app purchases.

### Is Red Flag Sim free?

Red Flag Sim costs $0.99, and also offers in-app purchases.

### Which has better reviews, Hmmsim Legacy or Red Flag Sim?

Red Flag Sim is rated higher. Hmmsim Legacy averages 4.5 out of 5 from 109 ratings, while Red Flag Sim averages 4.6 from 83 ratings.

### Do Hmmsim Legacy or Red Flag Sim have ads?

Neither Hmmsim Legacy nor Red Flag Sim shows ads.

### Which is updated more often, Hmmsim Legacy or Red Flag Sim?

Hmmsim Legacy ships an update fortnightly, and Red Flag Sim every 3 days. Most recently, Hmmsim Legacy was updated on October 26, 2026 and Red Flag Sim on October 28, 2026.

### Which is more popular, Hmmsim Legacy or Red Flag Sim?

Hmmsim Legacy currently peaks at #137 in the App Store charts, and Red Flag Sim at #17. Chart position reflects recent download velocity rather than total install base.

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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.*