# DryFire Trigger Unit vs OnTrack

The clearest difference is rating: OnTrack at 3.3 against DryFire Trigger Unit's 2.0. OnTrack also leads on update cadence (every 4 weeks vs every 3 months) and ratings volume (57 vs 2). DryFire Trigger Unit's advantage is in-app purchases (none vs 2) and iOS requirement (8.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. OnTrack sells 2 in-app purchases, starting at $3.99 per month. DryFire Trigger Unit asks for nothing beyond the download.

OnTrack holds the better App Store score, 3.3 against 2.0. That said, the two scores are not equally well evidenced: OnTrack has 57 ratings behind it against 2, so its average is the more settled of the two.

DryFire Trigger Unit ships an update every 3 months, OnTrack every 4 weeks. The most recent releases landed on November 3, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | DryFire Trigger Unit | OnTrack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (2 ratings)](https://appshunter.io/ios/app/dryfire-trigger-unit/id1291827365/reviews) | **[3.3 (57 ratings)](https://appshunter.io/ios/app/ontrack-obd2-scanner/id6446315145/reviews)** |
| Number of ratings | 2 | **57** |
| Positive reviews | — | 37.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 16 MB | 22 MB |
| Requires iOS | **8.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Wordcraft International Limited](https://appshunter.io/developer/294338798) | [OnTrack Apps Limited](https://appshunter.io/developer/1647551624) |

## What reviewers say

### DryFire Trigger Unit

[App page](https://appshunter.io/ios/app/dryfire-trigger-unit/id1291827365)

This application allows users to program a universal gun assembly for various firing modes and sensitivity settings. It connects the gun assembly to a specific system, enabling laser firing based on vibration detection.

**Highlights:** Program universal gun assembly, Select firing modes (press, release, universal), Adjust sensitivity in universal mode, Laser firing based on vibration, Link gun assembly to DryFire system

**Features:** macOS Compatibility

**In-app purchases:** none


### OnTrack

[App page](https://appshunter.io/ios/app/ontrack-obd2-scanner/id6446315145)

This app provides real-time car performance data via OBD2 connection, with CarPlay integration for easy monitoring on your dashboard. Set custom alerts for critical temperature values to optimize your vehicle's performance on the track.

**Highlights:** Real-time OBD2 data monitoring, CarPlay integration, Customizable temperature alerts, Engine RPM, coolant temp, oil pressure display, User-friendly interface, Bluetooth OBD adapter required

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $3.99 | per month |
| Yearly - Best Value | $29.99 | per year |

**What reviewers like**

- 👍 Great CarPlay integration
- 💡 Useful for monitoring temps and info
- 🚀 Fast refresh rate
- 👍 Easy to read info at a glance
- 👍 Highly customizable

**What reviewers complain about**

- 🐛 Connection issues with various dongles
- 🐛 Lack of support/unresponsive developers
- 🐛 App crashes
- 🐛 Limited PIDs available
- 🐛 Boost pressure limit

**Reported bugs**

- Lost connections with Vgate Pro
- App crashes as soon as it connects to OBD2 reader since iOS 18
- Öltemperatur (Oil temperature) not read for VW/Audi vehicles
- Boost bar maxes at 1.5 bar / 22.3psi
- Not connecting to OBDLink CX

**Requested features**

- Add gauges instead of numbers for CarPlay
- Add more PIDs (e.g., exhaust gas temperature, transmission temp)
- Vehicle selector
- Support landscape mode
- Add custom PIDs for vehicle-specific measurements


## Frequently asked questions

### Is DryFire Trigger Unit free?

DryFire Trigger Unit is free to download, with no in-app purchases.

### Is OnTrack free?

OnTrack is free to download, with in-app purchases available.

### Which has better reviews, DryFire Trigger Unit or OnTrack?

OnTrack is rated higher. DryFire Trigger Unit averages 2.0 out of 5 from 2 ratings, while OnTrack averages 3.3 from 57 ratings.

### Do DryFire Trigger Unit or OnTrack have ads?

Neither DryFire Trigger Unit nor OnTrack shows ads.

### Which is updated more often, DryFire Trigger Unit or OnTrack?

DryFire Trigger Unit ships an update every 3 months, and OnTrack every 4 weeks. Most recently, DryFire Trigger Unit was updated on November 3, 2026 and OnTrack on November 13, 2026.

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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.*