# Simply Fast vs zZz

The clearest difference is review sentiment: Simply Fast at 100% against zZz's 0%. Simply Fast also leads on rating (4.5 vs 2.9) and in-app purchases (none vs 1). zZz's advantage is price (Free vs $0.99) and update cadence (every 4 days vs every 2 months). On ads and device support there is nothing between them.

zZz is free to download; Simply Fast costs $0.99 up front. zZz sells 1 one-off in-app purchase. Simply Fast asks for nothing beyond the download.

Simply Fast holds the better App Store score, 4.5 against 2.9. That said, the two scores are not equally well evidenced: zZz has 11 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of Simply Fast's written reviews are positive against 0% of zZz's.

Simply Fast ships an update every 2 months, zZz every 4 days. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Simply Fast | zZz |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/simply-fast/id1463942932/reviews)** | [2.9 (11 ratings)](https://appshunter.io/ios/app/zzz-sleep-tracker-widget/id1586436109/reviews) |
| Number of ratings | 2 | **11** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 6 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mpathy Tech](https://appshunter.io/developer/1463942931) | [Florian Schweizer](https://appshunter.io/developer/1142213239) |

## What reviewers say

### Simply Fast

[App page](https://appshunter.io/ios/app/simply-fast/id1463942932)

This minimalist app helps you achieve time-restricted fasting goals with a simple, intuitive interface. Configure fasting start times and durations, and receive timely notifications for your fasting and eating windows. No account or sign-in is required.

**Highlights:** Simple and easy-to-use design, Customizable fasting start times, Adjustable fasting durations (12-23 hours), Fasting and eating window notifications, No sign-in or account required, Privacy-focused, no data collection

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

**In-app purchases:** none


### zZz

[App page](https://appshunter.io/ios/app/zzz-sleep-tracker-widget/id1586436109)

Easily log your sleep with a single tap using home or lock screen widgets. Track time in bed, awake time, and actual sleep duration, syncing data with Apple Health for insightful analysis.

**Highlights:** One-tap sleep logging, Home and lock screen widgets, Tracks time in bed, awake, and sleep, Syncs with Apple Health, Siri and Shortcuts integration

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Tier | $0.99 | one-time |


## Frequently asked questions

### Is Simply Fast free?

Simply Fast costs $0.99, with no in-app purchases.

### Is zZz free?

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

### Which has better reviews, Simply Fast or zZz?

Simply Fast is rated higher. Simply Fast averages 4.5 out of 5 from 2 ratings, while zZz averages 2.9 from 11 ratings.

### Do Simply Fast or zZz have ads?

Neither Simply Fast nor zZz shows ads.

### Which is updated more often, Simply Fast or zZz?

Simply Fast ships an update every 2 months, and zZz every 4 days. Most recently, Simply Fast was updated on October 9, 2026 and zZz 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.*