# Zero vs Experiment with Light

Zero and Experiment with Light both sit at 4.8 stars, but that hides the real split: 100% of Experiment with Light's written reviews are positive against 32% of Zero's. Experiment with Light also leads on in-app purchases (none vs 17) and iOS requirement (9.0 vs 17.0). Zero's advantage is ratings volume (445K vs 4) and chart position (#121 vs unranked). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Zero sells 10 in-app purchases, starting at $9.99 per month. Experiment with Light asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Zero against 4.8 for Experiment with Light. That said, the two scores are not equally well evidenced: Zero has 445K ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 32% of Zero's written reviews are positive against 100% of Experiment with Light's.

Zero ships an update every 2 weeks, Experiment with Light every 3 weeks. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Zero | Experiment with Light |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (445K ratings)](https://appshunter.io/ios/app/zero-fasting-and-food-tracker/id1168348542/reviews)** | [4.8 (4 ratings)](https://appshunter.io/ios/app/experiment-with-light/id1543380863/reviews) |
| Number of ratings | **445K** | 4 |
| Positive reviews | 32.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Freemium | **Free** |
| Best chart rank | **#121** | — |
| Size | 195 MB | 267 MB |
| Requires iOS | 17.0 | **9.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Zero Longevity Science, Inc.](https://appshunter.io/developer/1397458636) | [Alain Foussat](https://appshunter.io/developer/1543380865) |

## What reviewers say

### Zero

[App page](https://appshunter.io/ios/app/zero-fasting-and-food-tracker/id1168348542)

**Currently charting:** #121 Top Grossing · Health & Fitness (US App Store)

This app tracks intermittent fasting and nutrition to help users achieve real body composition changes. It integrates fasting, protein intake, meals, hydration, and habits for a holistic approach to weight loss and metabolic health.

**Highlights:** Intermittent fasting timers and streaks, Smart meal logging with photo recognition, Personalized daily protein target tracking, Integrated fasting and protein tracking, Water and habit tracking, Science-based insights on fasting and nutrition

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zero Plus Subscription | $9.99 | per month |
| Zero Plus Subscription | $9.99 | per month |
| Zero Plus Subscription | $39.99 | per year |
| Zero Plus Subscription | $49.99 | per year |
| Zero Plus Subscription | $69.99 | per year |
| Zero Plus Subscription | $69.99 | per year |
| Zero Plus Subscription | $69.99 | per year |
| Zero Plus Subscription | $69.99 | per year |
| Zero Plus Subscription | $89.99 | per year |
| Zero Plus Subscription | $89.99 | per year |

**What reviewers like**

- 🚀 Easy to use
- 📊 Helpful tracking and data
- 💡 Informative learning resources
- 🔍 Detailed fasting information
- 🤝 Sense of community

**What reviewers complain about**

- 💰 Expensive premium subscription
- 🔒 Forced account creation
- 🙄 Intrusive ads and upsells
- 🤔 Inconsistent or confusing UI changes
- 🐛 Syncing and login issues

**Reported bugs**

- Password reset problems
- Inaccurate fasting time tracking
- Inability to exit trial without subscribing

**Requested features**

- Custom fasting periods longer than 24 hours
- Ability to edit fasting type and duration
- Integration with more health/fitness apps
- Water intake tracking
- Personalized fasting recommendations


### Experiment with Light

[App page](https://appshunter.io/ios/app/experiment-with-light/id1543380863)

Access Quaker "Experiment with Light" meditation recordings and scripts. Choose from four versions with male or female voice options, or read the full script. This app works offline once installed.

**Highlights:** Meditation recordings, Full scripts, Multiple versions, Male/female voice options, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Zero free?

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

### Is Experiment with Light free?

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

### Which has better reviews, Zero or Experiment with Light?

Zero is rated higher. Zero averages 4.8 out of 5 from 445K ratings, while Experiment with Light averages 4.8 from 4 ratings.

### Do Zero or Experiment with Light have ads?

Neither Zero nor Experiment with Light shows ads.

### Which is updated more often, Zero or Experiment with Light?

Zero ships an update every 2 weeks, and Experiment with Light every 3 weeks. Most recently, Zero was updated on October 27, 2026 and Experiment with Light on October 24, 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.*