Zest vs FeRRUM Athletic Co.
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
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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.
FeRRUM Athletic Co.
Manage your fitness club membership with ease. Reserve spots in classes, sign up for gym events, and update your account details, including payment information and profile pictures.
- Class reservations
- Gym event sign-ups
- Account management
- Profile picture updates
- Payment information management
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For members of FeRRUM Athletic Co. to reserve their place in a class, sign up for gym events, and general account management like updating headshots and credit card on file.
Screenshots
Verdict
The clearest difference is ads: Zest at none against FeRRUM Athletic Co.'s shown. Zest also leads on monetization model (free vs ad-supported). FeRRUM Athletic Co.'s advantage is ratings volume (3 vs 1). On price, rating, update cadence 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.
On the App Store both sit at effectively the same score — 5.0 for Zest against 5.0 for FeRRUM Athletic Co.. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
Zest ships an update every 3 weeks, FeRRUM Athletic Co. fortnightly. The most recent releases landed on September 8, 2026 and June 11, 2026 respectively.
| Parameter | Zest | FeRRUM Athletic Co. |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (3 ratings) |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 3 weeks | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 16 | 15 — better |
| Further details — not scored | ||
| Size | 23 MB | 95 MB |
| Age rating | 17+ | 4+ |
| Developer | Zest Longevity LTD | Element 26 Fitness, LLC |
Customer experience
Zest
FeRRUM Athletic Co.
In-app purchases
Zest
No in-app purchases
FeRRUM Athletic Co.
No in-app purchases
Questions
Is Zest free?
Is FeRRUM Athletic Co. free?
Which has better reviews, Zest or FeRRUM Athletic Co.?
Do Zest or FeRRUM Athletic Co. have ads?
Which is updated more often, Zest or FeRRUM Athletic Co.?
Other comparisons
