# ScaleFlow vs 75 Hard Challenge Day Tracker

The clearest difference is device support: ScaleFlow at 3 against 75 Hard Challenge Day Tracker's 1. ScaleFlow also leads on iOS requirement (15.0 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. ScaleFlow sells 1 one-off in-app purchase and 75 Hard Challenge Day Tracker sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ScaleFlow ships an update every 3 days, 75 Hard Challenge Day Tracker every 5 days. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ScaleFlow | 75 Hard Challenge Day Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/75-hard-challenge-day-tracker/id6788652357/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 5 days |
| Monetization | — | Subscription |
| Size | 15 MB | 71 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tornike Svanidze](https://appshunter.io/developer/1889493474) | [Ngoc Truong](https://appshunter.io/developer/1837686613) |

## What reviewers say

### ScaleFlow

[App page](https://appshunter.io/ios/app/scaleflow/id6761417592)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ScaleFlow Pro | $4.99 | one-time |


### 75 Hard Challenge Day Tracker

[App page](https://appshunter.io/ios/app/75-hard-challenge-day-tracker/id6788652357)

This app helps you track your progress through customizable 75-day challenges, offering options from strict rules to flexible plans. Monitor daily tasks, water intake, and visualize your transformation with a photo timeline. Stay motivated with streaks and reminders.

**Highlights:** Customizable challenge rules (75 Hard, 75 Soft, Custom), Daily task checklist, Water intake tracking, Progress photo timeline, Streak calendar, Home Screen widget, Daily reminders

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro | $9.99 | per month |
| Yearly Pro | $29.99 | per year |
| Yearly Pro | $29.99 | per year |


## Frequently asked questions

### Is ScaleFlow free?

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

### Is 75 Hard Challenge Day Tracker free?

75 Hard Challenge Day Tracker is free to download, with in-app purchases available.

### Do ScaleFlow or 75 Hard Challenge Day Tracker have ads?

Neither ScaleFlow nor 75 Hard Challenge Day Tracker shows ads.

### Which is updated more often, ScaleFlow or 75 Hard Challenge Day Tracker?

ScaleFlow ships an update every 3 days, and 75 Hard Challenge Day Tracker every 5 days. Most recently, ScaleFlow was updated on October 10, 2026 and 75 Hard Challenge Day Tracker on October 24, 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.*