---
title: "Holley Terminator X - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "UNLOCK THE NEXT LEVEL OF TUNING CONTROL FOR YOUR VEHICLE with the Holley Terminator X EFI mobile app — the ultimate companion for performance tuning right from your iPhone or iPad.  Take control of yo"
---

# Holley Terminator X — United States
> Bluetooth App for Terminator X

![Holley Terminator X App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/05/c0/bb/05c0bb13-975f-f80b-b569-882526e066df/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png)

**Developer:** [Holley Performance Products](https://apptail.io/developer/holley-performance-products-hQzb)
**Category:** Utilities
**Rating:** 4.4/5 (5 ratings)
**Price:** Free
**Bundle ID:** com.holley.efi.terminatorx
**Store:** Apple App Store
**Country:** United States
**Version:** 1.0.11 (released 2026-10-07)
**Original Release:** 2025-06-25
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6736920316)
**AppTail Page:** [https://apptail.io/app/holley-terminator-x-UeHw/united-states](https://apptail.io/app/holley-terminator-x-UeHw/united-states)

## Holley Terminator X Description
UNLOCK THE NEXT LEVEL OF TUNING CONTROL FOR YOUR VEHICLE with the Holley Terminator X EFI mobile app — the ultimate companion for performance tuning right from your iPhone or iPad.

Take control of your engine’s performance with 250+ CUSTOMIZABLE PARAMETERS FOR PRECISE TUNING. Designed for enthusiasts and professionals alike, the Holley Terminator X EFI app lets you FINE TUNE ENGINE PARAMETERS FOR MAXIMUM PERFORMANCE — all from the convenience of your mobile device.

Key Features:

· Six pre-defined real-time monitoring screens for instant access to vital engine data

· Intuitive setup wizard helps you easily create a powerful base tune in minutes

· View real-time gauges on screen at a glance – no laptop required

· Effortlessly create, manage, and share your tuning files with others

· Record and share datalogs to review your performance anytime, anywhere

· Simple, step-by-step Throttle Position Sensor (TPS) setup for accurate control

Built specifically for use with Holley’s Terminator X EFI systems, this app gives you advanced tuning capabilities in a streamlined, mobile-friendly interface.

Perfect for racers, tuners, and performance enthusiasts — take your tuning to the next level and keep your engine dialed in with Holley.

App Requires the Holley Bluetooth Module to connect to the Terminator X ECU.

## Holley Terminator X Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/24/cb/ae/24cbaefb-9f39-1f51-c61c-a78302fb4f39/app_store_images_termx_phoneApple_3.jpg/1290x2796.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/31/4a/53/314a531e-b7c0-708b-809f-93df51baa638/app_store_images_termx_phoneApple_5.jpg/1290x2796.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/a0/19/e1/a019e1f9-8e7c-b10c-2f14-3ee102e397c8/app_store_images_termx_phoneApple_8.jpg/1290x2796.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/49/38/d1/4938d1f2-9ae3-eba9-8e7a-ded7954459c1/app_store_images_termx_phoneApple_4.jpg/1290x2796.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/b7/79/63/b7796382-06a0-b299-52b3-245e6dd4eaad/app_store_images_termx_phoneApple_7.jpg/1290x2796.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/00/4e/4a/004e4a65-7a18-789b-ca87-d870b2badf85/app_store_images_termx_phoneApple_2.jpg/1290x2796.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/83/56/2e/83562ed7-2d13-3259-4850-abb6d5184cb9/app_store_images_termx_phoneApple_6.jpg/1290x2796.png)
- [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/f5/c5/82/f5c5822f-7cdc-725e-08e5-9b0403207f16/app_store_images_termx_phoneApple_9.jpg/1290x2796.png)
- [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/fc/8b/f6/fc8bf678-5c15-e3d7-b704-82211361346d/app_store_images_termx_phoneApple_1.jpg/1290x2796.png)

## Holley Terminator X Rating Breakdown in United States
- 5 stars: 2 (40%)
- 4 stars: 3 (60%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)

## Holley Terminator X Reviews in United States

### ****- "Great app but should support car play"
The feature set available is great and vey useful. But if this could be a CarPlay app it would get 5stars
-- Smaggard79, 2025-07-18

### ****- "Good but limited"
So, first, when you install the module and turn on your car, it makes you dump the existing tune—so, if you’ve spent a bunch of time on the PC tweaking the settings, I/Os, or anything, that all goes away.  

With my install (Factory Five Cobra w/ G2 Coyote) I have a check engine light wired for output 2, and my fan set at output 4–they were working with my old map. 

Unfortunately, it’s only letting me set the fan output but not letting me set the CEL output. So, I’m sure I’ll be spending some quality time with tech support.  

I also have the Terminator driving my tach, which isn’t working now. So, I’ll need to figure that out too.  

I’m sure there’s ways to make all this work, and with a brand new app, you expect some room for improvement.  

I would love to see the app modified to download the existing map to continue working from. For everyone with an existing functioning tune, it’s crazy to force the deletion of it just to use this module.  

Aside from this gripe, it’s a really cool setup and using an iPad to tune/program is so much more convenient than using the tiny wired touchscreen that you have to use the stylus with.  

Once we see some app updates, I expect it will get better.
-- Mbbuff, 2025-06-30

[View all Holley Terminator X reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)




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## Holley Terminator X Available In
- [United States](https://apptail.io/app/holley-terminator-x-UeHw/united-states)
- [Canada](https://apptail.io/app/holley-terminator-x-UeHw/canada)

---

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