# Vessel vs JustFast

The clearest difference is in-app purchases: JustFast at none against Vessel's 3. Vessel's advantage is update cadence (every 4 days vs fortnightly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Vessel sells 3 in-app purchases, starting at $2.99 per month. JustFast asks for nothing beyond the download.

Vessel ships an update every 4 days, JustFast fortnightly. The most recent releases landed on October 18, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Vessel | JustFast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/justfast-timer/id6775042519/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Fortnightly |
| Monetization | — | Free |
| Size | 5 MB | 20 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [DUMITRU BUMBU](https://appshunter.io/developer/1868107712) | [Vitalii Vyrodov](https://appshunter.io/developer/1588698342) |

## What reviewers say

### Vessel

[App page](https://appshunter.io/ios/app/vessel-water-tracker/id6762180973)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Annual (25% Off) | $14.99 | per year |
| Annual | $19.99 | per year |


### 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


## Frequently asked questions

### Is Vessel free?

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

### Is JustFast free?

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

### Do Vessel or JustFast have ads?

Neither Vessel nor JustFast shows ads.

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

Vessel ships an update every 4 days, and JustFast fortnightly. Most recently, Vessel was updated on October 18, 2026 and JustFast on October 14, 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.*