# Habit Tracker 90 Day Challenge vs PrepFlex

Habit Tracker 90 Day Challenge and PrepFlex both sit at 5.0 stars, but that hides the real split: 100% of PrepFlex's written reviews are positive against 50% of Habit Tracker 90 Day Challenge's. PrepFlex also leads on in-app purchases (none vs 3) and ads (none vs shown). Habit Tracker 90 Day Challenge's advantage is update cadence (every 3 weeks vs every 10 months). On price, rating and ratings volume there is nothing between them.

Both are free to download. Habit Tracker 90 Day Challenge sells 3 in-app purchases, starting at $4.99 per 7 days. PrepFlex asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Habit Tracker 90 Day Challenge against 5.0 for PrepFlex. Both are backed by a comparable volume of ratings — 6 and 5 respectively. Written reviews are what separate them: 50% of Habit Tracker 90 Day Challenge's written reviews are positive against 100% of PrepFlex's.

Habit Tracker 90 Day Challenge ships an update every 3 weeks, PrepFlex every 10 months. The most recent releases landed on October 22, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Habit Tracker 90 Day Challenge | PrepFlex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (6 ratings)](https://appshunter.io/ios/app/habit-tracker-90-day-challenge/id6504715172/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/prepflex-study-optimizer/id6754576477/reviews) |
| Number of ratings | **6** | 5 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 10 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 21 MB | 25 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [NBApps](https://appshunter.io/developer/1443534730) | [Rajat Aggarwal](https://appshunter.io/developer/1849009713) |

## What reviewers say

### Habit Tracker 90 Day Challenge

[App page](https://appshunter.io/ios/app/habit-tracker-90-day-challenge/id6504715172)

Build positive habits with a tool that lets you create custom tracking, visualize progress over 90 days with heatmaps and graphs, and share your journey. Ideal for anyone looking to improve their daily routines.

**Highlights:** Custom habit creation, Numeric progress entries, 90-day progress visualization, Heatmaps and line graphs, Shareable progress reports, User-friendly interface

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Week | $4.99 | per 7 days |
| One Year | $14.99 | per year |
| Lifetime | $9.99 | one-time |


### PrepFlex

[App page](https://appshunter.io/ios/app/prepflex-study-optimizer/id6754576477)

This app creates personalized study plans from your available time and topics. It helps students organize last-minute study sessions into effective, time-balanced schedules tailored to their needs. The app focuses on efficiency with no sign-ins or distractions.

**Highlights:** Create personalized study plans, Tailored to available time, Add and weight study topics, Set confidence levels for topics, Local data storage for privacy, Distraction-free study environment

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

**In-app purchases:** none


## Frequently asked questions

### Is Habit Tracker 90 Day Challenge free?

Habit Tracker 90 Day Challenge is free to download, with in-app purchases available.

### Is PrepFlex free?

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

### Which has better reviews, Habit Tracker 90 Day Challenge or PrepFlex?

Habit Tracker 90 Day Challenge and PrepFlex are both rated 5.0 out of 5 on the App Store, from 6 and 5 ratings respectively.

### Do Habit Tracker 90 Day Challenge or PrepFlex have ads?

Habit Tracker 90 Day Challenge shows ads; PrepFlex does not.

### Which is updated more often, Habit Tracker 90 Day Challenge or PrepFlex?

Habit Tracker 90 Day Challenge ships an update every 3 weeks, and PrepFlex every 10 months. Most recently, Habit Tracker 90 Day Challenge was updated on October 22, 2026 and PrepFlex on October 18, 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.*