# JustFast vs Abstia

The clearest difference is rating: Abstia at 5.0 against JustFast's 4.5. Abstia also leads on iOS requirement (16.4 vs 18.0). JustFast's advantage is update cadence (fortnightly vs every 6 weeks). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Abstia holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

JustFast ships an update fortnightly, Abstia every 6 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | JustFast | Abstia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/justfast-timer/id6775042519/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/abstia/id6797053836/reviews)** |
| Number of ratings | 2 | 2 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 20 MB | 67 MB |
| Requires iOS | 18.0 | **16.4** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 17+ |
| Developer | [Vitalii Vyrodov](https://appshunter.io/developer/1588698342) | [Abstia, LLC](https://appshunter.io/developer/6797053838) |

## What reviewers say

### JustFast

[App page](https://appshunter.io/ios/app/justfast-timer/id6775042519)

This app offers a straightforward intermittent fasting timer. It focuses on tracking your fast with a clear, calm interface, providing insights into metabolic stages without gamification or pressure. It prioritizes privacy with on-device data storage and no accounts.

**Highlights:** One-tap start and stop, Live timer with accurate timekeeping, Metabolic milestone tracking, Plain-language explanations of milestones, Adjustable start/stop times, Ongoing notification for duration, Simple history of past fasts, 18 languages and dark design

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

**In-app purchases:** none


### Abstia

[App page](https://appshunter.io/ios/app/abstia/id6797053836)

This app provides a privacy-focused intermittent fasting tracker with real-time metabolic stage tracking and an AI coach. It helps users understand their body's physiological changes during fasting and offers personalized advice based on their history.

**Highlights:** Real-time metabolic stage tracking, Fasting timer and custom schedules, Personalized AI fasting coach, Biofeedback and health logging, Calendar heatmap and streaks, Widgets and Apple Watch support, Offline-first and private

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is JustFast free?

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

### Is Abstia free?

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

### Which has better reviews, JustFast or Abstia?

Abstia is rated higher. JustFast averages 4.5 out of 5 from 2 ratings, while Abstia averages 5.0 from 2 ratings.

### Do JustFast or Abstia have ads?

Neither JustFast nor Abstia shows ads.

### Which is updated more often, JustFast or Abstia?

JustFast ships an update fortnightly, and Abstia every 6 weeks. Most recently, JustFast was updated on November 5, 2026 and Abstia on October 31, 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.*