# Zengine Energy Compass vs TrueZone

The clearest difference is in-app purchases: Zengine Energy Compass at none against TrueZone's 2. TrueZone's advantage is update cadence (every 3 weeks vs every 9 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. TrueZone sells 2 one-off in-app purchases. Zengine Energy Compass asks for nothing beyond the download.

Zengine Energy Compass ships an update every 9 months, TrueZone every 3 weeks. The most recent releases landed on October 16, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Zengine Energy Compass | TrueZone |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 31 MB | 72 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Manfred Kuegel](https://appshunter.io/developer/1520736594) | [Driftline ehf.](https://appshunter.io/developer/1574232641) |

## What reviewers say

### Zengine Energy Compass

[App page](https://appshunter.io/ios/app/zengine-energy-compass/id1555210196)

Understand your body's stress and energy responses by tracking your autonomous nervous system. Identify habits that drain or boost your vitality to improve sleep and overall well-being. Requires a compatible heart rate sensor for detailed analysis.

**Highlights:** Autonomous nervous system analysis, Stress and energy level tracking, Habit impact identification, Sleep improvement insights, Requires Polar heart rate sensor

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

**In-app purchases:** none


### TrueZone

[App page](https://appshunter.io/ios/app/truezone/id1574232639)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Heart rate analysis | $5.99 | one-time |
| 10 fitness tests | $49.99 | one-time |


## Frequently asked questions

### Is Zengine Energy Compass free?

Zengine Energy Compass is free to download, with no in-app purchases.

### Is TrueZone free?

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

### Do Zengine Energy Compass or TrueZone have ads?

Neither Zengine Energy Compass nor TrueZone shows ads.

### Which is updated more often, Zengine Energy Compass or TrueZone?

Zengine Energy Compass ships an update every 9 months, and TrueZone every 3 weeks. Most recently, Zengine Energy Compass was updated on October 16, 2026 and TrueZone on October 6, 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.*