Comparison

Lingo by Abbott vs Zest

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

Head to head
About

Lingo by Abbott

This system tracks your glucose 24/7 to provide real-time insights into your body's response to food and activities. It helps you understand your metabolism, learn personalized eating habits, and monitor progress towards your health goals.

Highlights
  • Real-time glucose tracking
  • Personalized food insights
  • Metabolism understanding
  • Habit building challenges
  • Daily glucose exposure score
  • Food and activity logging
  • Progress reporting
Read full description

What, when, and how you eat has a big impact on your body. It’s all connected. And it’s influenced by your personal glucose patterns. See for yourself in real time, with Lingo — a science-backed system designed to power healthy habit change.  Glucose is a powerful signal reflecting your body’s unique response to food. The Lingo Biosensor and App tracks your glucose 24/7, translating the data into insights you can use to optimize your nutrition, build new habits, and improve your metabolic health.     Know your body in a new way.  Rooted in decades of research and made by Abbott — a global leader in continuous glucose monitoring (CGM) technology‡ — the Lingo Biosensor streams glucose data directly to your phone, so you can see the impact of what, when, and how you eat.   The Lingo app offers personal insights about which foods work for your body. Armed with data and insights, you can make diet and lifestyle choices that support your health goals.     Fad diets don’t work. Science does.  - UNDERSTAND YOUR METABOLISM: See your personal glucose response to different foods and activities.  - LEARN NEW WAYS OF EATING: Discover which foods work for you and what to prioritize. Every person is different. Insights from Lingo help you know your body in a new way.  - SEE YOUR PROGRESS: See the impact of your new habits add up over time. Lingo provides daily, weekly, and monthly snapshots to keep you on track.  A closer look at the features and benefits:  - Glucose graph — See your glucose graph update throughout the day based on continuous readings from your biosensor.   - Lingo Count — This is your glucose exposure translated into one dynamic daily number. It’s simple. It’s actionable. It’s your target to stay within each day.  - Food & activity logging — Log meals in seconds by taking or uploading a photo, or search from a large food database. Every meal you log now includes a nutrition breakdown — like protein, carbs, and fat — alongside your glucose data. Sync with Apple Health® to auto-log activity and see your glucose data†† in Apple Health.  - Personal insights — Weekly progress reports come with personal recommendations based on the meals and activity you log and how they impact your glucose.  - Put your habits to the test — Test new habits with science-backed challenges. Find what fits your lifestyle and start to build your healthiest routines.  - Export glucose data — Download your glucose data to easily share it with your healthcare provider. ‡ Data on file, Abbott Diabetes Care, Inc. Based on the number of users worldwide for the FreeStyle Libre portfolio compared to the number of users for other leading personal use sensor-based glucose monitoring systems. †† Lingo does not measure or send blood glucose data to any health apps. Lingo sends glucose data measured via interstitial fluid to health apps. The Lingo Glucose System is for users 18 years and older not on insulin. It is NOT intended for diagnosis of diseases, including diabetes. Individual responses may vary.
© 2026 Abbott. All rights reserved. The biosensor shape and appearance, Lingo, and related brand marks are marks and/or designs of the Abbott group of companies in various territories. Other marks are the property of their respective owners.
The product images are representative only.

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.

Screenshots

Lingo by Abbott4 screens
Zest4 screens

Verdict

The call

The clearest difference is rating: Zest at 5.0 against Lingo by Abbott's 4.5. Zest also leads on update cadence (every 3 weeks vs every 2 months). Lingo by Abbott's advantage is ratings volume (8.5K vs 1) and chart position (#156 vs unranked). On price, ads, in-app purchases and monetization model 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

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

Zest holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Lingo by Abbott has 8.5K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Lingo by Abbott ships an update every 2 months, Zest every 3 weeks. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 7 level
Lingo by Abbott versus Zest: the parameters behind the verdict, then further details
ParameterLingo by AbbottZest
PriceFreeFree
Rating4.5 (8.5K ratings)5.0 (1 ratings) — better
Positive reviews44.2% of reviews—
Number of ratings8.5K — better1
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
Best chart rank#156 — better—
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.1 — better16
Further details — not scored
Size191 MB23 MB
Age rating17+17+
DeveloperAbbottZest Longevity LTD

Customer experience

Lingo by Abbott

All ratings8,399 ratings
Positive86.4%
Neutral5.9%
Negative7.8%
Written reviews1,622 reviews
Positive44.2%
Neutral17.1%
Negative38.7%

Zest

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

Bugs and requests

Lingo by Abbott

Reported bugs

4 issues
  • Sensor connectivity issues
  • Inaccurate glucose readings
  • Data sync problems and data loss
  • Inconsistent app performance after updates

Requested features

5 requests
  • Apple Health integration
  • Apple Watch app and complications
  • More detailed data analysis and visualization
  • Customizable glucose level alerts
  • Improved food logging and tracking

Zest

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Lingo by Abbott

No in-app purchases

None

Zest

No in-app purchases

Questions

Is Lingo by Abbott free?
Lingo by Abbott is free to download, with no in-app purchases.
Is Zest free?
Zest is free to download, with no in-app purchases.
Which has better reviews, Lingo by Abbott or Zest?
Zest is rated higher. Lingo by Abbott averages 4.5 out of 5 from 8.5K ratings, while Zest averages 5.0 from 1 ratings.
Do Lingo by Abbott or Zest have ads?
Neither Lingo by Abbott nor Zest shows ads.
Which is updated more often, Lingo by Abbott or Zest?
Lingo by Abbott ships an update every 2 months, and Zest every 3 weeks. Most recently, Lingo by Abbott was updated on November 7, 2026 and Zest on October 30, 2026.

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