# AtomicWeight vs SheFast

The clearest difference is in-app purchases: AtomicWeight at none against SheFast's 3. SheFast's advantage is iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. SheFast sells 3 in-app purchases, starting at $3.99 per 7 days. AtomicWeight asks for nothing beyond the download.

AtomicWeight ships an update fortnightly, SheFast every 4 weeks. The most recent releases landed on September 14, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | AtomicWeight | SheFast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/shefast-cycle-fasting-tracker/id6763439355/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 weeks |
| Monetization | — | Subscription |
| Size | 2 MB | 37 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Tomas Antunes](https://appshunter.io/developer/1801729350) | [Omnivera LLC](https://appshunter.io/developer/1895315592) |

## What reviewers say

### AtomicWeight

[App page](https://appshunter.io/ios/app/atomicweight/id6743163643)

**In-app purchases:** none


### SheFast

[App page](https://appshunter.io/ios/app/shefast-cycle-fasting-tracker/id6763439355)

This app offers cycle-synced fasting plans that adapt to your body's natural phases. It provides personalized fasting windows, gentle reminders, and progress tracking to support your wellness journey without demanding perfection.

**Highlights:** Cycle-aware fasting plans, Personalized fasting windows, Rest days to protect streaks, Guided daily wellness course, Fasting history and progress insights, Water and protein tracking, Gentle reminders

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $3.99 | per 7 days |
| SheFast Premium Monthly | $14.99 | per month |
| Yearly Access | $64.99 | per year |


## Frequently asked questions

### Is AtomicWeight free?

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

### Is SheFast free?

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

### Do AtomicWeight or SheFast have ads?

Neither AtomicWeight nor SheFast shows ads.

### Which is updated more often, AtomicWeight or SheFast?

AtomicWeight ships an update fortnightly, and SheFast every 4 weeks. Most recently, AtomicWeight was updated on September 14, 2026 and SheFast on September 17, 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.*