Flow Smart v2 vs USim OS
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
Flow Smart v2
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Max Racing Exhaust Flow-Smart Version 2 exhaust valve control application. Max Racing Exhaust App is the best way to engage and experience life in motion. Empower yourself with real-time instrument updates & control your car exhaust sound on your smartphone. Easy to use with connectivity to Max Racing Exhaust valve system. *This application only supports Max Racing Exhaust 3 modes exhaust valve controller with OBDII module plugged in the car. Features: ā¢ Race Mode. ā¢ Eco Mode. ā¢ Auto Mode. ā¢ Speed meter real-time data. ā¢ Rpm real-time data. ā¢ Water oil temperature data. ā¢ Intake temperature data.
USim OS
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About USim OS App, Our company focuses on providing cloud products, IoT cards, and other IoT value-added products for the IoT market.
Screenshots
Verdict
The clearest difference is update cadence: USim OS at weekly against Flow Smart v2's monthly. Flow Smart v2's advantage is iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Flow Smart v2 ships an update monthly, USim OS weekly. The most recent releases landed on September 29, 2026 and October 3, 2026 respectively.
| Parameter | Flow Smart v2 | USim OS |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | Weekly ā better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 11.0 ā better | 13.0 |
| Further details ā not scored | ||
| Size | 40 MB | 77 MB |
| Age rating | 4+ | 4+ |
| Developer | Kwang Teck Lim | Ruiyu Chen |
In-app purchases
Flow Smart v2
No in-app purchases
USim OS
No in-app purchases
