# Know Your Lemons vs 75 Day Challenge

The clearest difference is in-app purchases: Know Your Lemons at none against 75 Day Challenge's 7. Know Your Lemons also leads on iOS requirement (15.0 vs 17.0). 75 Day Challenge's advantage is review sentiment (88% vs 77%) and ratings volume (412 vs 128). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. 75 Day Challenge sells 7 in-app purchases, starting at $3.99 per 7 days. Know Your Lemons asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Know Your Lemons against 4.7 for 75 Day Challenge. Both are backed by a comparable volume of ratings — 128 and 412 respectively. Written reviews are what separate them: 77% of Know Your Lemons's written reviews are positive against 88% of 75 Day Challenge's.

Know Your Lemons ships an update fortnightly, 75 Day Challenge every 3 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Know Your Lemons | 75 Day Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (128 ratings)](https://appshunter.io/ios/app/know-your-lemons/id1420212829/reviews)** | [4.7 (412 ratings)](https://appshunter.io/ios/app/75-day-challenge-soft-edition/id6670955917/reviews) |
| Number of ratings | 128 | **412** |
| Positive reviews | 77.1% of reviews | **88.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | **Free** | Freemium |
| Size | 196 MB | 25 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Know Your Lemons Foundation Inc.](https://appshunter.io/developer/1420212828) | [Inkolab](https://appshunter.io/developer/1726749975) |

## What reviewers say

### Know Your Lemons

[App page](https://appshunter.io/ios/app/know-your-lemons/id1420212829)

This app empowers users to take control of their breast health. It offers personalized risk assessment, monthly self-exam reminders, and educational tools to understand symptoms and prepare for screenings. Track your cycle and learn how to perform self-exams with confidence.

**Highlights:** Monthly self-exam reminders, Personalized risk calculation, Screening plan creation, Audio self-exam guides, Menstrual cycle tracking, Learn 12 breast cancer symptoms

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use and navigate
- 💡 Informative and educational content
- 🚀 Helpful reminders for self-exams
- 🎨 Beautiful and engaging design
- ✅ Clear explanations of symptoms

**What reviewers complain about**

- 🐛 Reminder notifications often inaccurate
- 🐛 Risk assessment quiz bugs/restarts
- 🐛 Data loss issues
- 🐛 Login problems/inability to re-enter
- 🐛 Outdated recurrence statistics

**Reported bugs**

- Reminder notifications are consistently wrong (early or not sent)
- Risk assessment quiz restarts mid-quiz
- User data disappears after a period
- Unable to log back into the app after initial use
- Age selection in screening quiz is limited and buggy

**Requested features**

- Adjustable reminder timings for varying cycle lengths
- Reminders to stay on Lock Screen/icon badge
- More inclusive language for transgender individuals
- Inclusion of UK/global location data
- Update recurrence statistics with current data


### 75 Day Challenge

[App page](https://appshunter.io/ios/app/75-day-challenge-soft-edition/id6670955917)

This app guides users through a 75-day program to build healthy habits and develop resilience. It focuses on consistency and sustainable change for both physical and mental wellness, offering a balanced approach to self-improvement.

**Highlights:** Build lasting healthy habits, Stay motivated daily, Visualize progress, Home screen widgets (Premium), Customize challenge rules (Premium), Flexible scheduling

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $3.99 | per 7 days |
| Premium Access | $4.99 | per 7 days |
| Premium Access | $14.99 | per year |
| Premium Access | $19.99 | per year |
| Premium Access | $29.99 | per year |
| Unlock all features | $4.99 | one-time |
| Unlock all features | $34.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Simple and straightforward
- 💡 Helpful for 75 Soft challenge
- 🤩 Motivating and keeps you on track
- 🌟 Cute and aesthetically pleasing design

**What reviewers complain about**

- 🔍 Limited customization options
- 🚫 Premium version doesn't offer much value
- 🐛 Occasional app crashes

**Reported bugs**

- App crashes when trying to start the challenge
- Issues with the app on older iOS versions

**Requested features**

- Add ability to track additional daily goals
- Implement calendar view to see progress
- Allow recording of specific water intake amounts


## Frequently asked questions

### Is Know Your Lemons free?

Know Your Lemons is free to download, with no in-app purchases.

### Is 75 Day Challenge free?

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

### Which has better reviews, Know Your Lemons or 75 Day Challenge?

Know Your Lemons is rated higher. Know Your Lemons averages 4.8 out of 5 from 128 ratings, while 75 Day Challenge averages 4.7 from 412 ratings.

### Do Know Your Lemons or 75 Day Challenge have ads?

Neither Know Your Lemons nor 75 Day Challenge shows ads.

### Which is updated more often, Know Your Lemons or 75 Day Challenge?

Know Your Lemons ships an update fortnightly, and 75 Day Challenge every 3 weeks. Most recently, Know Your Lemons was updated on October 25, 2026 and 75 Day Challenge 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.*