# VOID vs FastFlow

The clearest difference is in-app purchases: VOID at none against FastFlow's 2. VOID also leads on ads (none vs shown). FastFlow's advantage is update cadence (every 5 days vs every 2 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. FastFlow sells 2 in-app purchases, starting at $0.99 per month. VOID asks for nothing beyond the download.

VOID ships an update every 2 weeks, FastFlow every 5 days. The most recent releases landed on September 3, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | VOID | FastFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/void-intermittent-fasting/id6756490807/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | Free | — |
| Size | 50 MB | 11 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [河南雀科信息科技有限公司](https://appshunter.io/developer/1439539185) | [浩铭 顾](https://appshunter.io/developer/1873844063) |

## What reviewers say

### VOID

[App page](https://appshunter.io/ios/app/void-intermittent-fasting/id6756490807)

This AI-powered coach visualizes your fasting progress, from blood sugar depletion to fat burning. Log meals instantly with photo recognition or voice commands, and receive personalized nutrition and exercise advice. Gamified motivation and smart hydration tracking help build healthy habits.

**Highlights:** AI-powered nutrition coaching, Visualized fasting progress, AI meal logging via photo/voice, Deep Apple Watch integration, Personalized nutrition advice, Gamified motivation and rewards, Smart hydration tracking

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

**In-app purchases:** none


### FastFlow

[App page](https://appshunter.io/ios/app/fastflow-fasting-timer/id6760942083)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastFlow Pro Monthly | $0.99 | per month |
| FastFlow Pro Yearly | $9.99 | per year |


## Frequently asked questions

### Is VOID free?

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

### Is FastFlow free?

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

### Do VOID or FastFlow have ads?

FastFlow shows ads; VOID does not.

### Which is updated more often, VOID or FastFlow?

VOID ships an update every 2 weeks, and FastFlow every 5 days. Most recently, VOID was updated on September 3, 2026 and FastFlow on September 16, 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.*