Zest vs Unbound
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
Read full descriptionHide full description
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.
Unbound
This app offers personalized health guidance by combining culture, science, and community. It provides grounding rituals and connects users with a supportive community to foster intentional living. Insights are derived from in-person assessments and reports by licensed clinicians.
- Personalized health guidance
- Grounding rituals
- Community support
- Clinician-prepared reports
- In-person assessments
Read full descriptionHide full description
Unbound makes health feel human again. By blending culture, science and community, you get personalised guidance, grounding rituals and a real community to help you live intentionally. Your insights are based on in-person assessments and reports prepared by licensed clinicians, giving you a clear and trusted foundation for your journey. ____________ Important Information Unbound provides access to medical reports written by licensed clinicians following in-person assessments. The app does not independently diagnose, prescribe or treat medical conditions and does not replace professional medical advice. Always consult your clinician before making health decisions. If you believe you are experiencing a medical emergency, contact emergency services immediately.
Screenshots
Verdict
Zest and Unbound are too close to call on the numbers: across 9 compared parameters — price, rating, ratings volume and update cadence among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
On the App Store both sit at effectively the same score — 5.0 for Zest against 5.0 for Unbound. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 10, 2026 and September 29, 2026 respectively.
| Parameter | Zest | Unbound |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 16 | 15.1 — better |
| Further details — not scored | ||
| Size | 23 MB | 94 MB |
| Age rating | 17+ | 17+ |
| Developer | Zest Longevity LTD | Unbound Living |
Customer experience
Zest
Unbound
In-app purchases
Zest
No in-app purchases
Unbound
No in-app purchases









