Privacy Policy
Fastology (“Fastology,” “we,” “us,” or “our”) provides a fasting and wellness app for iPhone, iPad, Apple Watch, and related Apple surfaces. This Privacy Policy explains how we collect, use, disclose, and protect information when you use the Fastology app, related support features, and our connected cloud services (together, the “Services”).
This Privacy Policy is intended to describe the Fastology app and its related app services.
Fastology is a wellness product. It is not a medical service, and this Privacy Policy should be read together with our Terms of Use and in-app disclosures.
1. Information We Collect
We collect the information below to operate the app, sync your data across devices, personalize your experience, provide support, and improve the product.
A. Account and authentication information
Depending on how you use Fastology, we may collect:
a Fastology account identifier
an anonymous session identifier when you use the app before linking an account
your Apple Sign In information, such as the name and email address Apple shares with us if you choose to sign in with Apple
account state information, such as whether your session is anonymous or linked to Sign in with Apple
We do not offer email-and-password signups.
B. Profile, onboarding, and plan information
If you complete onboarding or update your preferences, we may collect information such as:
your name
goals and fasting experience
current weight and target weight
meal timing preferences
fasting routine and scheduling preferences
selected plan information
notification choices and related onboarding preferences
C. Fasting, schedule, and weight data
If you use the core tracking features, we may collect:
fasting logs, including start time, target end time, actual end time, eating-window timing, protocol, duration targets, and completion status
fast-related notes
mood check-ins you choose to record in connection with a fast
water tracking you choose to record
scheduled fasting settings, per-day schedules, overrides, and pause settings
weight log entries you choose to enter manually
Fastology does not currently use HealthKit to read or write your health data.
D. Ask and feedback content
If you use research or support features, we may collect:
questions you submit to Fastology Ask
answers returned to you and related source metadata
thumbs-up or thumbs-down feedback on Ask responses
optional written feedback you submit about Ask responses
support or product feedback you send through the app
an optional reply email address if you provide one
E. Device, app, and diagnostics information
We may collect technical information needed to operate and secure the Services, such as:
app version and build number
iOS, iPadOS, watchOS, or other Apple platform version
device model
installation identifier
sync metadata such as device identifier and last-updated timestamps
notification settings or permission status as needed to show reminder controls and notification state in the app
F. Product analytics
If analytics are enabled for the app environment, we collect limited behavioral product analytics to help us understand feature usage and product flow performance.
Based on the current analytics schema and filtering rules, these analytics are intended to focus on product and behavior signals such as screen views, onboarding progression, fast start and end events, scheduling actions, reminder interactions, app version, build channel, and high-level account state.
Our analytics documentation and event-filtering rules are intended to exclude certain categories of data from analytics payloads, including:
body metrics such as weight, BMI, height, or target weight
onboarding safety responses and similar health- or condition-related details
mood values
free-form notes
feedback text
Ask question and answer text
This analytics section describes product analytics payloads only. It does not mean those categories are never processed elsewhere in Fastology, such as in syncing, support, or Ask features you choose to use.
2. How We Use Information
We use the information we collect to:
provide the Fastology app and its core fasting, scheduling, insights, and support features
create and maintain anonymous or linked accounts
sync your data across devices through our backend services
personalize fasting plans, reminders, settings, and educational experiences
apply safety gates, warnings, and eligibility logic
provide Ask answers and related feedback features
troubleshoot errors, maintain security, and prevent misuse
measure feature usage and improve product quality
respond to support requests, bug reports, and feature requests
comply with legal obligations and protect our rights and users
We do not use your information for third-party advertising or cross-context behavioral advertising.
We may also create and use aggregated or de-identified information for product improvement, analytics, research, and operational purposes where permitted by applicable law.
3. How We Share Information
We do not sell your personal information.
We do not share your information with third parties for their own advertising purposes.
We may disclose information in the following limited situations:
A. Service providers
We use service providers to host and operate the Services. Based on the current app architecture, these may include providers that support:
authentication and cloud data storage
backend functions and sync
product analytics
These providers may process information on our behalf only to provide services to Fastology and subject to contractual and technical controls.
B. Apple platform services
If you use Sign in with Apple, TestFlight, or Apple platform features such as notifications, Apple may process information under its own terms and privacy practices.
C. Legal and safety reasons
We may disclose information if required by law or if we reasonably believe disclosure is necessary to:
comply with legal process
respond to lawful requests from public authorities
protect the rights, property, or safety of Fastology, our users, or others
investigate fraud, abuse, or security incidents
D. Business transfers
If Fastology is involved in a merger, acquisition, financing, reorganization, bankruptcy, or sale of assets, information may be transferred as part of that transaction, subject to applicable law.
4. Analytics and Tracking
Fastology uses limited product analytics to understand app performance and user flows.
Fastology currently uses PostHog for limited product analytics on US-hosted infrastructure.
We do not use the app to serve targeted ads.
We do not use app data for cross-context behavioral advertising.
We do not intentionally send health-adjacent body metrics, safety-screening answers, mood values, or free-form personal content to third-party analytics tools.
If our analytics practices materially change, we will update this Privacy Policy and any required App Store privacy disclosures before those changes apply.
5. Data Retention
We retain information for as long as reasonably necessary to provide the Services, maintain your account, support syncing, comply with legal obligations, resolve disputes, and enforce our agreements.
Retention periods may vary depending on the type of data:
account, profile, fasting, schedule, Ask, and weight data may be retained while your account or anonymous session remains active and for a reasonable period afterward
support and feedback submissions may be retained to respond to you and improve the product
limited technical logs may be retained for security, debugging, and reliability purposes
We may also retain information as reasonably necessary to comply with legal obligations, resolve disputes, enforce our agreements, and maintain appropriate backup, audit, and business records.
6. Your Choices and Rights
Depending on where you live, you may have rights to access, correct, delete, or receive a copy of certain information, or to object to or limit certain processing.
You may also be able to:
edit profile and fasting information in the app
delete certain logged data in the app
disable notifications in iOS settings
use the in-app account deletion flow for linked and anonymous accounts
contact us to request access, correction, or deletion
To submit a privacy request, contact us at hello@fastology.app.
We may need to verify your identity before acting on a request.
Deleting your account or data may not remove all information immediately from backups or archived systems, but we will handle retained information in accordance with applicable law.
7. Children
Fastology is not directed to children under 18, and we do not knowingly collect personal information from children under 18.
If you believe a child under 18 has provided us with personal information, contact us at hello@fastology.app so we can review and take appropriate action.
8. Security
We use reasonable administrative, technical, and organizational safeguards designed to protect information against unauthorized access, loss, misuse, alteration, or disclosure.
No method of transmission over the Internet or method of electronic storage is completely secure, so we cannot guarantee absolute security.
9. International Processing
We and our service providers may process information in countries other than the one where you live. Those countries may have different data protection laws than your home jurisdiction.
10. Changes to This Policy
We may update this Privacy Policy from time to time. If we make material changes, we will update the “Updated” date above and take other steps as required by applicable law.
11. Contact Us
If you have questions about this Privacy Policy or our privacy practices, contact us at:
hello@fastology.app