aRacer X Tune vs K Magic
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
aRacer X Tune
This app allows for advanced engine tuning and analysis for specific ECU series. It offers features like fuel and ignition timing adjustments, automatic correction, and traction control. Paid upgrades unlock more powerful functions for a customized experience.
- Fuel and ignition timing adjustment
- Automatic adjustment functions
- Traction control system (TCS)
- Power response adjustment
- Guided idle speed setting
- Backfire/Idle lope control
- New analysis tools
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X Tune APP is aRacer puts the experience in participating of global competitions in the past, providing for new generation ECU for engine adjustment. It is suitable for RC Super X and RC Mini X series ECUs with more user-friendly interface, more convenient to use, and is suitable for holiday track days and daily use. It uses WiFi transmission to complete the adjustment and analysis of the relevant data in a more stable and faster way! In addition, you can also pay to turn on the built-in ECU functions according to the needs of the use, so it is the fun of playing in the engine tuning can be extended infinitely!! X Tune has more powerful built-in functions including (depending on different sales countries and regions, related functions need to be paid to turn on): # More powerful adjustment functions: 1. 20x17 (RPM x TPS%) fuel adjustment 2. 20x9 (RPM x TPS%) ignition timing adjustment (paid to upgrade can enable switching of 3 ignition timing MAP) 3. 20x9 (RPM x TPS%) target air-fuel ratio setting (paid to upgrade can enable switching of 3 target air-fuel ratio MAP) # More powerful AT automatic adjustment function and more accurate & fast actual A/F data feedback through AF2 / AF1: 1. Correct the fuel value% & A/F value in time and record it in the 20x17 fuel MAP 2. The corrected result can be used as a base fuel MAP # New features: 1. TCS tracking functions: # The stock is not equipped with TCS, and it can be easily work in rainy and slippery conditions after starting # The stock is equipped with TCS, can provide 3 levels adjustable 2. 3 levels of fuel correction in stock narrowband O2 sensor Adjustable injection phase 3. Response Button for power response adjustment. After the upgrade, you can switch 3 target air-fuel & ignition timing MAPs in time 4. Guided idle speed setting 5. Guided quick shift triggered pressure setting 6. New style Backfire / Idle lope control 7. New analysis tools # Notes: 1. X Tune is only suitable for safe and closed road track, and don’t allow to be used in public road!! 2. After paying to turn on the ECU functions, no refund can be made, because the function has been turned-on in the ECU! Before paying, you can use the trial function to confirm the applicability! 3. The adjustment function may damage the engine, please find a qualified professional technician to adjust it and it is not suitable for general users! Any adjustment causes engine damage and dangerous accidents, the company cannot provide any compensation! About the details, please refer to: https://www.aracer-speedtek.com/product_d.php?lang=tw&tb=1&id=1770
K Magic
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K Magic is a tool used through a mobile app to adjust KOSO's motorcycle turn signals. It connects via Bluetooth and is used to adjust the turn signal flashing frequency, interval, flashing sound effects, and volume. By connecting to the device's network, you can also upload custom sound files to use as flashing sound effects.
Screenshots
Verdict
The clearest difference is in-app purchases: aRacer X Tune at none against K Magic's 4. aRacer X Tune also leads on update cadence (fortnightly vs monthly). On price, ads, 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. K Magic sells 4 one-off in-app purchases. aRacer X Tune asks for nothing beyond the download.
aRacer X Tune ships an update fortnightly, K Magic monthly. The most recent releases landed on October 21, 2026 and October 30, 2026 respectively.
| Parameter | aRacer X Tune | K Magic |
|---|---|---|
| Price | Free | Free |
| Rating | 2.9 (17 ratings) — better | — |
| Positive reviews | 19.0% of reviews | — |
| Number of ratings | 17 — better | — |
| Update frequency | Fortnightly — better | Monthly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 120 MB | 111 MB |
| Age rating | 4+ | 4+ |
| Developer | ARACER SPEEDTEK INC. | Tong Yah Electronic Technology Co., Ltd. |
In-app purchases
aRacer X Tune
No in-app purchases
K Magic
- 30 KOSO COINS$0.99
- 60 KOSO COINS$1.99
- 120 KOSO COINS$3.99
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- 240 KOSO COINS$6.99









