# E vs Comp 2.0

The clearest difference is rating: E at 4.0 against Comp 2.0's 3.8. E also leads on ratings volume (22 vs 6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

E holds the better App Store score, 4.0 against 3.8. Both are backed by a comparable volume of ratings — 22 and 6 respectively.

E ships an update every 8 months, Comp 2.0 every 11 months. The most recent releases landed on August 29, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | E | Comp 2.0 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (22 ratings)](https://appshunter.io/ios/app/e-tuner-4/id1579096205/reviews)** | [3.8 (6 ratings)](https://appshunter.io/ios/app/comp-20/id6450721506/reviews) |
| Number of ratings | **22** | 6 |
| Positive reviews | 45.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 11 months |
| Monetization | Free | Free |
| Size | 50 MB | 139 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Edelbrock Corp](https://appshunter.io/developer/1579096297) | [Holley Performance Products](https://appshunter.io/developer/1175069390) |

## What reviewers say

### E

[App page](https://appshunter.io/ios/app/e-tuner-4/id1579096205)

This app connects wirelessly to an EFI system, allowing users to monitor engine data and adjust various settings like air-fuel ratios and ignition timing. It offers a setup wizard for initial calibration and advanced tuning options for performance optimization.

**Highlights:** Bluetooth ECU communication, Live tuning of ECU settings, Real-time engine and sensor data monitoring, Setup Wizard for base calibration, Advanced tuning functions, Diagnostic troubleshooting page, Vivid gauge displays

**Features:** macOS Compatibility

**In-app purchases:** none


### Comp 2.0

[App page](https://appshunter.io/ios/app/comp-20/id6450721506)

Enhance your 1998.5-2002 24V Cummins diesel engine's performance with on-the-fly adjustments. Fine-tune fueling, accelerator pedal response, and timing for significant power gains.

**Highlights:** On-the-fly adjustability via Bluetooth, Fine-tune low boost fueling, Adjust fuel delivery based on pedal position, Optimize timing for power curves, Gains of 40-150 HP and 150-380 TQ, Supports aftermarket injectors and turbos

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is E free?

E is free to download, with no in-app purchases.

### Is Comp 2.0 free?

Comp 2.0 is free to download, with no in-app purchases.

### Which has better reviews, E or Comp 2.0?

E is rated higher. E averages 4.0 out of 5 from 22 ratings, while Comp 2.0 averages 3.8 from 6 ratings.

### Do E or Comp 2.0 have ads?

Neither E nor Comp 2.0 shows ads.

### Which is updated more often, E or Comp 2.0?

E ships an update every 8 months, and Comp 2.0 every 11 months. Most recently, E was updated on August 29, 2026 and Comp 2.0 on September 11, 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.*