Comparison

Zest vs Unbound

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

Head to head
About

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.

Highlights
  • Measure Functional Age
  • At-home health testing
  • Personalized health insights
  • Machine learning analysis
  • Tailored recommendations
  • Track aging metrics
Read 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.

About

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.

Highlights
  • Personalized health guidance
  • Grounding rituals
  • Community support
  • Clinician-prepared reports
  • In-person assessments
Read 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

Zest4 screens
Unbound4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 10, 2026 and September 29, 2026 respectively.

ScorecardNo meaningful differences
Zest versus Unbound: the parameters behind the verdict, then further details
ParameterZestUnbound
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Number of ratings11
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS1615.1 — better
Further details — not scored
Size23 MB94 MB
Age rating17+17+
DeveloperZest Longevity LTDUnbound Living

Customer experience

Zest

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Unbound

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Zest

No in-app purchases

None

Unbound

No in-app purchases

Questions

Is Zest free?
Zest is free to download, with no in-app purchases.
Is Unbound free?
Unbound is free to download, with no in-app purchases.
Which has better reviews, Zest or Unbound?
Zest and Unbound are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Zest or Unbound have ads?
Neither Zest nor Unbound shows ads.
Which is updated more often, Zest or Unbound?
Zest ships an update every 3 weeks, and Unbound every 3 weeks. Most recently, Zest was updated on October 10, 2026 and Unbound on September 29, 2026.

Other comparisons