# Eight Sleep vs Source Performance

The clearest difference is review sentiment: Source Performance at 100% against Eight Sleep's 28%. Source Performance also leads on in-app purchases (none vs 4) and rating (5.0 vs 4.8). Eight Sleep's advantage is update cadence (every 4 days vs every 2 months) and ratings volume (17K vs 9). On price and ads there is nothing between them.

Both are free to download. Eight Sleep sells 4 in-app purchases, starting at $10.00 per month. Source Performance asks for nothing beyond the download.

Source Performance holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Eight Sleep has 17K ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 28% of Eight Sleep's written reviews are positive against 100% of Source Performance's.

Eight Sleep ships an update every 4 days, Source Performance every 2 months. The most recent releases landed on September 29, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Eight Sleep | Source Performance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (17K ratings)](https://appshunter.io/ios/app/eight-sleep/id1086913845/reviews) | **[5.0 (9 ratings)](https://appshunter.io/ios/app/source-performance/id6590602459/reviews)** |
| Number of ratings | **17K** | 9 |
| Positive reviews | 27.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 245 MB | 180 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Eight Sleep, Inc](https://appshunter.io/developer/1105586839) | [Source Performance LLC](https://appshunter.io/developer/1760047672) |

## What reviewers say

### Eight Sleep

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

This intelligent sleep system actively manages your sleep environment by adjusting temperature and elevation. It tracks detailed sleep metrics and provides personalized insights to help you wake up feeling refreshed. The system supports individual sleep profiles for multiple users.

**Highlights:** Personalized temperature control, Automatic elevation adjustments, Sleep stage tracking, Heart rate and HRV monitoring, Snoring detection, Gentle wake-up alarms, Dual sleep profiles

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 8+ Standard (Monthly) | $10.00 | per month |
| 8+ Pro (Monthly) | $18.99 | per month |
| 8+ Standard (Annual) | $96.00 | per year |
| 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


### Source Performance

[App page](https://appshunter.io/ios/app/source-performance/id6590602459)

This app provides personalized workout programs and tracks your fitness journey. Monitor workouts, nutrition, habits, and measurements with coach support. Achieve your health goals with guided exercises and progress tracking.

**Highlights:** Access and track training plans, Follow exercise and workout videos, Track meals and food choices, Monitor daily habits, Set and track health goals, Message your coach in real-time, Track body measurements and progress photos

**Features:** Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Eight Sleep free?

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

### Is Source Performance free?

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

### Which has better reviews, Eight Sleep or Source Performance?

Source Performance is rated higher. Eight Sleep averages 4.8 out of 5 from 17K ratings, while Source Performance averages 5.0 from 9 ratings.

### Do Eight Sleep or Source Performance have ads?

Neither Eight Sleep nor Source Performance shows ads.

### Which is updated more often, Eight Sleep or Source Performance?

Eight Sleep ships an update every 4 days, and Source Performance every 2 months. Most recently, Eight Sleep was updated on September 29, 2026 and Source Performance on September 18, 2026.

---

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