# Know Your Lemons vs Runfa.st

The clearest difference is in-app purchases: Know Your Lemons at none against Runfa.st's 2. Know Your Lemons also leads on iOS requirement (15.0 vs 26.0). Runfa.st's advantage is update cadence (every 2 days vs fortnightly). On price, ads and device support there is nothing between them.

Both are free to download. Runfa.st sells 2 in-app purchases, starting at $4.99 per 7 days. Know Your Lemons asks for nothing beyond the download.

Know Your Lemons ships an update fortnightly, Runfa.st every 2 days. The most recent releases landed on October 14, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Know Your Lemons | Runfa.st |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (125 ratings)](https://appshunter.io/ios/app/know-your-lemons/id1420212829/reviews)** | — |
| Number of ratings | **125** | — |
| Positive reviews | 77.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | Free | — |
| Size | 196 MB | 20 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [Know Your Lemons Foundation Inc.](https://appshunter.io/developer/1420212828) | [Jan Zarcky](https://appshunter.io/developer/1876516490) |

## 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- 🐛 Outdated recurrence statistics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


### Runfa.st

[App page](https://appshunter.io/ios/app/runfast/id6759449924)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Runfast Weekly Subscription | $4.99 | per 7 days |
| Runfast Monthly Subscription | $9.99 | per month |


## Frequently asked questions

### Is Know Your Lemons free?

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

### Is Runfa.st free?

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

### Do Know Your Lemons or Runfa.st have ads?

Neither Know Your Lemons nor Runfa.st shows ads.

### Which is updated more often, Know Your Lemons or Runfa.st?

Know Your Lemons ships an update fortnightly, and Runfa.st every 2 days. Most recently, Know Your Lemons was updated on October 14, 2026 and Runfa.st on September 30, 2026.

---

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