# Compagnon Pro vs Voltage

The clearest difference is in-app purchases: Compagnon Pro at none against Voltage's 5. Compagnon Pro also leads on device support (3 vs 1) and iOS requirement (15.6 vs 18.2). On price, update cadence and ads there is nothing between them.

Both are free to download. Voltage sells 5 one-off in-app purchases. Compagnon Pro asks for nothing beyond the download.

Compagnon Pro ships an update weekly, Voltage every 5 days. The most recent releases landed on October 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Compagnon Pro | Voltage |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (8 ratings)](https://appshunter.io/ios/app/voltage-volt-ampera-bolt-obd/id6774315064/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | — | Free |
| Size | 46 MB | 54 MB |
| Requires iOS | **15.6** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ideeri](https://appshunter.io/developer/1797747838) | [Oleksandr Radchenko](https://appshunter.io/developer/6774315066) |

## What reviewers say

### Compagnon Pro

[App page](https://appshunter.io/ios/app/compagnon-pro/id6742320059)

**In-app purchases:** none


### Voltage

[App page](https://appshunter.io/ios/app/voltage-volt-ampera-bolt-obd/id6774315064)

This app provides comprehensive diagnostic and control features for specific GM electric and hybrid vehicles. It allows users to monitor various vehicle parameters, perform deep diagnostics, and even control certain functions remotely via an OBD2 adapter.

**Highlights:** Deep DTC scanning, Live parameter monitoring, Real-time battery analysis, HV Unlock function, Remote start and climate control, Charge management and scheduling, Module reset and clearing

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ELR / Volt Design activation | $4.99 | one-time |
| ELR / Volt Design activation | $9.99 | one-time |
| Traffic Signs Activation (discount) | $9.99 | one-time |
| Traffic Signs Activation | $19.99 | one-time |
| Premium upgrade | $24.99 | one-time |


## Frequently asked questions

### Is Compagnon Pro free?

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

### Is Voltage free?

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

### Do Compagnon Pro or Voltage have ads?

Neither Compagnon Pro nor Voltage shows ads.

### Which is updated more often, Compagnon Pro or Voltage?

Compagnon Pro ships an update weekly, and Voltage every 5 days. Most recently, Compagnon Pro was updated on October 1, 2026 and Voltage on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*