# SparkFast vs FastFlex Fasting Tracker

The clearest difference is update cadence: SparkFast at every 4 days against FastFlex Fasting Tracker's every 3 weeks. SparkFast also leads on device support (4 vs 2). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. SparkFast sells 6 in-app purchases, starting at $6.99 per month and FastFlex Fasting Tracker sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

SparkFast ships an update every 4 days, FastFlex Fasting Tracker every 3 weeks. The most recent releases landed on September 17, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | SparkFast | FastFlex Fasting Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fastflex-fasting-tracker/id6756032313/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | — | Freemium |
| Size | 95 MB | 44 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SparkFast Technologies LLC](https://appshunter.io/developer/1852736867) | [Orkhan Hasanbeck](https://appshunter.io/developer/1858104196) |

## What reviewers say

### SparkFast

[App page](https://appshunter.io/ios/app/sparkfast/id6755233574)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SparkFast Monthly | $6.99 | per month |
| SparkFast Annual | $48.00 | per year |
| SparkFast Annual | $51.00 | per year |
| SparkFast Annual | $54.00 | per year |
| SparkFast Annual | $57.00 | per year |
| SparkFast Yearly | $64.99 | per year |


### FastFlex Fasting Tracker

[App page](https://appshunter.io/ios/app/fastflex-fasting-tracker/id6756032313)

This app helps you visualize your intermittent fasting progress with a unique visual tracker. It offers various fasting schedules, comprehensive tracking tools, and motivational milestones to keep you engaged. Designed for both beginners and experienced fasters, it focuses on privacy and a clean, intuitive interface.

**Highlights:** Visual progress tracking, Multiple fasting schedules, Customizable fasting durations, Fasting timer with milestones, Journal for insights, Weight tracking, Color-coded history

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastFlex Premium Monthly | $0.99 | per month |
| FastFlex Premium Annual | $9.99 | per year |


## Frequently asked questions

### Is SparkFast free?

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

### Is FastFlex Fasting Tracker free?

FastFlex Fasting Tracker is free to download, with in-app purchases available.

### Do SparkFast or FastFlex Fasting Tracker have ads?

Neither SparkFast nor FastFlex Fasting Tracker shows ads.

### Which is updated more often, SparkFast or FastFlex Fasting Tracker?

SparkFast ships an update every 4 days, and FastFlex Fasting Tracker every 3 weeks. Most recently, SparkFast was updated on September 17, 2026 and FastFlex Fasting Tracker on June 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*