Comparison

Know Your Lemons vs 75 Day Challenge

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Know Your Lemons

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
Read full description

Don’t wait to find a breast problem before you learn about breast health! Earn your two lemons and become a Lemonista Confidence: Play games and follow guided lessons to learn how to do a breast self-exam. Intelligence: Complete the Tyrer-Cuzick risk assessment to learn about your personal risk and get a custom screening plan. Make it part of your health routine with monthly self-exam reminders, badges, tools to help you prepare for screening, and helpful guides on what to do if you find something. Created by the Know Your Lemons Foundation, winner of the 2025 Webby Award for Best Health, Wellness & Fitness app. As a charity, security and privacy are important to us. Data collection is to prevent losing information and to enable additional features. Your health data is securely stored, is not sold to third parties, and your account and its data can be deleted at any time.

About

75 Day Challenge

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
Read full description

I originally built this app for myself, as a fitness enthusiast looking to rebuild healthy habits. After experiencing its positive impact, I refined it to help others achieve the same transformation. In just 75 days, you’ll build better habits, push your limits, and develop the resilience to tackle any goal. WHY THE 75 SOFT? - Achieve Lasting Change: Transform your daily routine and watch how small, consistent actions lead to big, lasting results. - Stay Motivated Every Day: It’s not just about crossing off tasks; it’s about creating momentum. With each day, you’ll feel more motivated to keep going. - Create Healthier Habits: From fitness to mental wellness, you’ll develop routines that set you up for long-term success—without overwhelming yourself. - Visualize Your Progress: Seeing how far you’ve come will inspire you to keep pushing forward, even on tough days. - Share Your Wins: turn any completed day into a beautiful sticker, add your own photo, and post your progress straight to your story. - Life Happens? Forgiving Mode keeps your challenge alive even when a day isn't perfect — progress over perfection. - Smart Daily Reminders: one gentle nudge at the time you choose. It skips days you've already completed and stops when your challenge ends. - Home Screen Widgets (Premium): Track and update your challenge directly from your Home Screen with interactive widgets. - Customize Your Challenge (Premium): Edit challenge rules and add up to 4 custom rules to tailor the challenge to your goals and make it uniquely yours. - Flexibility for Your Life: Choose your start date or adjust it later if needed, making it easier to fit the challenge into your schedule. If you’ve heard of the 75 Hard, you know how intense and demanding it can be. The 75 Soft offers a more balanced approach to self-improvement, focusing on consistency and sustainable habits without the extreme pressure. It’s perfect for those who want to challenge themselves but also value flexibility and long-term success. WHAT’S POSSIBLE? - A healthier, more focused you—both physically and mentally. - The confidence that comes with discipline and consistency. - The ability to stick to your goals, even when life gets in the way. - A sense of accomplishment that fuels your next big challenge. TAKE CONTROL OF YOUR JOURNEY Whether you're looking to improve your fitness, sharpen your mindset, or simply stay committed to personal growth, the 75 Soft helps you create the life you want—one day at a time. Your journey starts here. Download now and become the best version of yourself. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Know Your Lemons4 screens
75 Day Challenge4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Know Your Lemons versus 75 Day Challenge: the parameters behind the verdict, then further details
ParameterKnow Your Lemons75 Day Challenge
PriceFreeFree
Rating4.8 (128 ratings) — better4.7 (412 ratings)
Positive reviews77.1% of reviews88.2% of reviews — better
Number of ratings128412 — better
Update frequencyFortnightly — betterEvery 3 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPod — betteriPhone
Requires iOS15.0 — better17.0
Further details — not scored
Size196 MB25 MB
Age rating4+4+
DeveloperKnow Your Lemons Foundation Inc.Inkolab

Customer experience

Know Your Lemons

All ratings128 ratings
Positive95.3%
Neutral2.3%
Negative2.3%
Written reviews48 reviews
Positive77.1%
Neutral4.2%
Negative18.8%

75 Day Challenge

All ratings405 ratings
Positive94.1%
Neutral1.5%
Negative4.4%
Written reviews144 reviews
Positive88.2%
Neutral2.8%
Negative9.0%

User reviews

Know Your Lemons

From 128 App Store ratings

What we love

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

Room to improve

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

75 Day Challenge

From 412 App Store ratings

What we love

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

Room to improve

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

Bugs and requests

Know Your Lemons

Reported bugs

9 issues
  • 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
Show 4 more
  • Main screen content overlaps on some devices
  • Incorrect website URL mentioned in video
  • Notifications not received
  • Login screen pop-up doesn't appear

Requested features

9 requests
  • 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
Show 4 more
  • More detailed risk assessment considering subtype and stage
  • Fix for risk assessment quiz restarting
  • Fix for data disappearing
  • Fix for login issues and re-entry problems

75 Day Challenge

Reported bugs

2 issues
  • App crashes when trying to start the challenge
  • Issues with the app on older iOS versions

Requested features

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

In-app purchases

None

Know Your Lemons

No in-app purchases

7 purchases

75 Day Challenge

Subscriptions5
  • Premium Access3 Days trial$3.997 Days
  • Premium Access3 Days trial$4.997 Days
  • Premium Access$14.991 Year
Show 2 more
  • Premium Access$19.991 Year
  • Premium Access$29.991 Year
One-time2
  • Unlock all features$4.99
  • Unlock all features$34.99

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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