Don't Die vs Zest
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Don't Die
This app fosters a supportive community for sharing health journeys and achievements. It helps users improve their longevity score through habit mastery, local event connections, and friendly competition. Integrate wearables for automatic score calculation and progress tracking.
- Share health achievements with community
- Connect with local communities and events
- Improve health habits and Don't Die Score
- Compete with friends and family on scores
- Measure progress with wearable integration
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- SHARE: Share your health, achievements, knowledge, workouts, and more with a friendly and encouraging community. - EXPLORE: Connect with local Don’t Die communities and events near you. - LEVEL UP: Master health habits by constantly improving your Don’t Die Score. - COMPETE: See how your Don’t Die Score compares with your friends, family, and Bryan Johnson. - MEASURE: Connect your wearable to automatically calculate your daily Don’t Die Score, and track your progress over time towards longevity best practices.
Zest
Discover your body's internal age and receive personalized insights to slow your aging rate. This app uses at-home tests and machine learning to analyze health metrics like cardiovascular fitness and cognitive function, providing tailored recommendations for improvement.
- Measure Functional Age
- At-home health testing
- Personalized health insights
- Machine learning analysis
- Tailored recommendations
- Track aging metrics
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Ever wondered how old your body actually is on the INSIDE? Discover your Functional Age with Zest. For the first time in history, we have the tools to address aging at its core, and the science to help you to slow your rate of aging. A big part of this is tracking your body’s age on the inside and working to improve your metrics – which is where Zest comes in. Our app and simple at-home test dive deeply into your health, measuring everything from cardiovascular fitness, metabolic health, cognitive function and hormonal health. We use cutting-edge machine learning technology to analyze this data and give you an incredibly accurate measure of your Functional Age (your body’s age on the inside) which you can track and improve over time. Unlike chronological age, which simply counts years, functional age takes a holistic approach and looks at all of your body systems. How it works: 1. Unbox your at-home test: A simple finger prick and a few quick questions to get started. 2. Mail it back: We'll analyze your blood and digital biomarkers to reveal your Functional Age. 3. Results in-App: Dive into personalized insights about your body's performance. 4. Optimize your health: Get tailored recommendations to keep improving your functional age over time. Zest was built by a team of medical doctors, longevity scientists and researchers, and backed up by 100+ clinical trials. We are constantly updating and evaluating our recommendations to ensure we are consistent with the latest research. Are you ready to feel younger for longer? Let's redefine aging together. This product is not intended for diagnostic or treatment purposes and does not constitute healthcare advice. It is designed for healthy individuals to better understand their bodies and avoid future diseases. If you are concerned about any of your results in this app please contact your healthcare provider.
Screenshots
Verdict
The clearest difference is ratings volume: Don't Die at 680 against Zest's 1. Don't Die also leads on update cadence (weekly vs every 3 weeks). Zest's advantage is monetization model (free vs ad-supported). On price, rating, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Zest holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Don't Die has 680 ratings behind it against 1, so its average is the more settled of the two.
Don't Die ships an update weekly, Zest every 3 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.
| Parameter | Don't Die | Zest |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (680 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 70.1% of reviews | — |
| Number of ratings | 680 — better | 1 |
| Update frequency | Weekly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 16 |
| Further details — not scored | ||
| Size | 53 MB | 23 MB |
| Age rating | 17+ | 17+ |
| Developer | Blueprint Bryan Johnson | Zest Longevity LTD |
Customer experience
Don't Die
Zest
Bugs and requests
Don't Die
Reported bugs
3 issues- Difficulty verifying phone number
- Issues with updating fitness levels and leaderboard
- Compatibility problems on smaller devices
Requested features
3 requests- Option to use the app without linking personal data
- Improved stability and performance
- Enhanced leaderboard and fitness tracking features
Zest
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Don't Die
No in-app purchases
Zest
No in-app purchases
