# Eight Sleep vs Z2/4×4 Trainer

The clearest difference is update cadence: Eight Sleep at every 4 days against Z2/4×4 Trainer's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Eight Sleep sells 2 in-app purchases, starting at $18.99 per month and Z2/4×4 Trainer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Eight Sleep ships an update every 4 days, Z2/4×4 Trainer every 3 weeks. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Eight Sleep | Z2/4×4 Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (18K ratings)](https://appshunter.io/ios/app/eight-sleep/id1086913845/reviews)** | — |
| Number of ratings | **18K** | — |
| Positive reviews | 28.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 265 MB | 5 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Eight Sleep, Inc](https://appshunter.io/developer/1105586839) | [Chenfei Chu](https://appshunter.io/developer/6776864992) |

## What reviewers say

### Eight Sleep

[App page](https://appshunter.io/ios/app/eight-sleep/id1086913845)

This advanced sleep system intelligently adjusts temperature and elevation for personalized comfort. It tracks detailed sleep metrics, offering insights and recommendations to help you wake up refreshed. Supports up to two users with individual profiles and customizable wake-up features.

**Highlights:** Personalized temperature control, Intelligent sleep tracking, Autopilot for automatic adjustments, Sleep stage analysis, Customizable vibration alarm, Dual sleep profiles

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 8+ Pro (Monthly) | $18.99 | per month |
| 8+ Pro (Annual) | $179.99 | per year |

**What reviewers like**

- 🚀 Amazing sleep quality
- 🌡️ Effective temperature control
- 📊 Detailed sleep tracking
- 🤖 Helpful AI features
- 🏆 Great customer service

**What reviewers complain about**

- 🐛 Buggy app with frequent crashes
- 🔌 Requires constant internet connection
- 🕰️ Alarm and temperature controls not intuitive
- 🔄 Inconsistent sleep data and metrics
- 💰 Expensive with mandatory subscription

**Reported bugs**

- App freezes and loses connection to pod
- Alarms not working or turning off properly
- Temperature settings not saving or resetting
- Sleep data not syncing or displaying accurately
- Frequent app crashes and performance issues

**Requested features**

- Apple Watch app integration
- Offline temperature/alarm controls
- Customizable sleep tracking and insights
- Improved alarm snooze/dismiss functionality
- Nap mode and more sleep schedule flexibility


### Z2/4×4 Trainer

[App page](https://appshunter.io/ios/app/z244-trainer/id6776864990)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Z2/4×4 Pro (Lifetime) | $14.99 | one-time |


## Frequently asked questions

### Is Eight Sleep free?

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

### Is Z2/4×4 Trainer free?

Z2/4×4 Trainer is free to download, with in-app purchases available.

### Do Eight Sleep or Z2/4×4 Trainer have ads?

Neither Eight Sleep nor Z2/4×4 Trainer shows ads.

### Which is updated more often, Eight Sleep or Z2/4×4 Trainer?

Eight Sleep ships an update every 4 days, and Z2/4×4 Trainer every 3 weeks. Most recently, Eight Sleep was updated on November 11, 2026 and Z2/4×4 Trainer on November 10, 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.*