What Zero Longevity Science does

Zero Longevity Science is a San Francisco-based consumer health technology company operating the Zero mobile app, the leading intermittent fasting tracker with over 20 million downloads and a 4.8 App Store rating. Founded in 2017 as Big Sky Health by Mike Maser and rebranded in April 2022 under CEO Tom Conrad, the company has expanded beyond a single-purpose fasting timer into a broader metabolic health platform. The app combines a real-time fasting timer supporting protocols such as 16:8, 20:4, and 36-hour fasts with AI-powered meal tracking via photo or text input, a daily Protein Score, hydration monitoring, and personalized insights derived from behavioral patterns. The product integrates with Apple Health, Oura, Fitbit, Biosense, Google Fit, and Apple Watch, aggregating data from the major consumer health wearable ecosystems. Content is medically reviewed by Chief Medical Officer Dr. Naomi Parrella, a board-certified physician in Family and Obesity Medicine and Chief of Lifestyle Medicine at Rush University.

The company operates a freemium business model with free core fasting tracking and a paid Zero Plus annual subscription tier offering advanced features including Fasting Zones, custom fasting plans, expert content, and personalized coaching. Customer acquisition is primarily product-led through app stores, supplemented by a 40% commission affiliate program, content marketing via the company blog, webinars featuring the medical team, and earned media in publications including Men's Health, Fortune, Fast Company, Women's Health, and Good Housekeeping. The user base is entirely direct-to-consumer individual subscribers with no enterprise contracts disclosed, and the company has raised approximately $12.2 million across disclosed funding rounds from Greycroft, Trinity Ventures, and True Ventures.

Headcount is reported at 11-50 employees with headquarters at 3739 Balboa St in San Francisco. The company remains privately held with ownership concentrated among founders and early venture investors. Strategic priorities in 2026 include the major product relaunch of Zero Plus, expansion of AI-driven nutrition features, Android platform improvements, and continued global consumer reach through app store distribution.

Name

Zero Longevity Science

Legal name

Zero Longevity Science, Inc.

Website

https://zerolongevity.com

Company type

Private

Founded year

2017

Operating status

Operating

Headcount range

11–50 employees

Short description

Zero Longevity Science operates the Zero mobile app, a leading intermittent fasting tracker with 20M+ downloads that has expanded into a broader metabolic health platform featuring AI-powered meal tracking, a daily Protein Score, and hydration monitoring for individual consumers seeking sustainable weight management.

Ownership category

akta.pro rank

Product category

Consumer Health & Wellness Apps

NAICS

Diet and Weight Reducing Centers (812191), Hobby, Toy, and Game Retailers (459120)

SIC

Electromedical & Electrotherapeutic Apparatus (3845)

akta.pro primary industry

Consumer Health Wearables & Fitness Trackers (Wellness Monitoring) (HLAHACAJ)

Keywords

• Intermittent fasting app
• Nutrition tracking software
• Metabolic health platform
• Protein intake scoring
• Wearable health integration

Headquarters

HQ city

San Francisco

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2C

Offering type

Software

Cost components

Technology or R&D, Personnel, Marketing or Sales, Operations, Others

Revenue model

1. Zero Plus Premium Subscription: Premium subscription tier offering advanced features including fasting zones, custom fasting plans, expert content, and personalized coaching. The app operates on a freemium model with free basic features and paid premium features.
2. Affiliate Commission: 40% commission on every new Zero Plus subscriber referred through the affiliate program, paid on a net-30 schedule.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels6 records

Core offering

Zero Longevity Science sells the Zero mobile app, a consumer fasting and nutrition tracker that lets users start and monitor intermittent fasts in real time (16:8, 20:4, 36-hour protocols), log meals via AI photo or text, and receive a daily Protein Score and hydration tracking. A premium annual subscription called Zero Plus unlocks advanced features including Fasting Zones, custom fasting plans, expert-led content, and personalized coaching. The app is offered free with the subscription tier and is distributed globally through the Apple App Store, Google Play, and an affiliate partner program.

Product overview

Zero Longevity Science offers a unified mobile app platform centered on the Zero intermittent fasting tracker, which has expanded beyond pure fasting to encompass comprehensive metabolic health management. The core product is the Zero app, a free fasting tracker with real-time timer, multiple fasting protocols (16:8, 20:4, 36-hour), and pattern-based insights. The premium tier, Zero Plus, adds Fasting Zones tracking, custom plans, and expert coaching. Supporting features include AI-powered meal photo tracking (Protein Score), hydration monitoring, and educational content via the Zero Blog. The app integrates with major health wearables including Apple Health, Oura Ring, Fitbit, Biosense, and Google Fit for comprehensive health data synchronization. Available on iOS and Android with Apple Watch companion functionality.

Differentiator

Problem solved

Functional benefit

Products and services

• Zero App (Intermittent Fasting Tracker) Free mobile intermittent fasting tracker for individual consumers. Provides a one-tap fasting timer with real-time progress tracking, multiple fasting protocols (16:8, 20:4, 36-hour), metabolic-zone indicators, pattern-based personalized insights, hydration tracking, and AI-powered meal logging via photo or text. Available on iOS, Android, and Apple Watch; integrates with Apple Health, Oura, Fitbit, Biosense, and Google Fit.
• Zero Plus Premium Subscription Annual premium subscription add-on for individual consumers using the Zero app. Unlocks Fasting Zones (anabolic and catabolic state tracking), custom fasting plans, expert-led content, personalized fasting coaching, and an improved Android experience.
• Zero AI Meal Tracking Standalone feature within the Zero app: computer-vision meal tracking that lets users snap a photo or type a description of a meal and receive an automatic breakdown of protein, carbs, calories, and fat, with personalized guidance toward daily protein goals.
• Protein Score Standalone feature within the Zero app: a daily Protein Score (0–100) that balances calorie needs with optimal protein intake and updates as meals are logged, giving users a single clear metric to dial in protein without overeating.
• Hydration Tracking Standalone feature within the Zero app: personalized daily water-intake goals with simple visual tap-based tracking to support fasting and appetite control.
• Zero Apple Watch App Standalone companion app for individual consumers: enables starting and ending fasts, viewing the fasting timer, and logging hydration directly from an Apple Watch without needing to access the phone.

Quantifiable outcome

• Users have lost millions of pounds collectively through the Zero app
• +3 more outcomes

Named customers7 records

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration6 records

AI capability6 records

Feature5 records

Partnerships

Six partnerships are on record, tiered core.

• Apple HealthcoreTechnology or IntegrationIntegration allowing users to sync health data including resting heart rate, HRV, mindful minutes, steps, activity, active energy burned, caloric intake, glucose, weight, body fat percentage, VO2 max, and sleep data from Apple Health ecosystem.
• OuracoreTechnology or IntegrationIntegration with Oura ring for syncing health metrics including sleep data, readiness scores, and activity information to provide comprehensive metabolic health tracking.
• FitbitcoreTechnology or IntegrationIntegration with Fitbit devices for syncing activity, sleep, heart rate, and other health metrics to support fasting and nutrition tracking.
• Google FitcoreTechnology or IntegrationIntegration with Google Fit platform for syncing health and activity data across Android devices.
• BiosensecoreTechnology or IntegrationIntegration with Biosense devices for tracking metabolic health metrics including breath acetone for ketone monitoring.
• Apple WatchcoreTechnology or IntegrationCompanion Apple Watch app allowing users to track fasting progress, view timer, and log hydration directly from their wrist without needing to pull out their phone.

Scale indicators7 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Noom: Subscription-based weight-loss and behavior-change app targeting the same health-conscious consumer segment with personalized coaching, food logging, and habit formation — directly overlapping with Zero's value proposition.
• Lose It!: Calorie counting and weight loss app with a premium tier and barcode/photo food logging, serving users seeking sustainable weight management — overlapping significantly with Zero's meal and weight-loss features.
• MyFitnessPal: Mass-market nutrition and calorie tracking app with a premium tier; one of the most-downloaded health apps globally and a direct competitor in food/meal logging and nutrition guidance.
• LifeSum: European-headquartered health and nutrition app combining meal tracking, fasting, and personalized plans under a freemium subscription model targeting the same consumer wellness segment.
• BetterMe: Subscription health and wellness app offering personalized weight-loss, fasting, and workout plans to a similar consumer audience, with heavy paid social acquisition.
• Cronometer: Detailed nutrition tracking app focused on micronutrients and macros with a premium subscription, serving a similar health-conscious user base interested in metabolic optimization.

Broad incumbents

• Fitbit (Google): Connected fitness platform with its own app, premium subscription, and integrated wearable hardware — overlapping with Zero in activity, sleep, and nutrition tracking while bundling first-party device data.
• WW (Weight Watchers): Long-established weight-management program with a digital subscription app and coaching community — overlapping with Zero's weight-loss value proposition from a broader, brand-led position.

Others

• Oura: Smart ring hardware maker with a subscription app for sleep, readiness, and metabolic insights; a current Zero integration partner that could become a competitor if it expands into nutrition or fasting guidance.

Emerging players

• Whoop: Subscription wearable and coaching platform focused on recovery, strain, and sleep; targets the same health-optimization consumer with deeper biometric insights and its own proprietary hardware.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat6 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/zerolongevity
• YouTubeyoutube.com/c/zerolongevity
• Facebookfacebook.com/zerolongevity
• LinkedInlinkedin.com/company/zerolongevity
• Instagraminstagram.com/zerolongevity

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds4 records

Investors3 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Zero Longevity Science