Last updated: August 21, 2026
OneFast is an intermittent fasting, wellness, nutrition and health-tracking application.
This Privacy Policy explains what information OneFast accesses, collects, processes, stores and shares, including health and fitness data.
OneFast processes health and wellness information in order to provide its fasting, weight, hydration, nutrition and health-tracking features.
Depending on the features you choose to use, this information may include:
body weight and weight history;
target weight;
height;
age;
fasting start and end times;
fasting duration, type, status and history;
fasting goals and preferences;
water intake and hydration goals;
meal plans;
calorie targets and nutrition preferences;
health and fitness information accessed through Health Connect, when authorized by the user.
OneFast does not require all of this information to be provided in order to use every feature of the application. The data processed depends on the features selected by the user.
Health and fitness information may be obtained in two ways.
Users may manually provide information such as:
weight;
target weight;
height;
age;
fasting information;
fasting goals;
water intake;
hydration goals;
meal and nutrition preferences.
Fasting information can also be generated from actions performed within the application, such as starting or ending a fasting session.
If the user chooses to connect OneFast to Android Health Connect and grants the requested permissions, OneFast may read:
step count;
sleep information;
heart rate;
active calories burned;
body weight.
Access to Health Connect data is optional and subject to the permissions explicitly granted by the user.
Users can revoke OneFast's Health Connect permissions through Android or Health Connect settings.
OneFast does not use Google Fit.
Health and wellness information is used to provide features requested by the user, including:
tracking fasting sessions;
displaying fasting history and progress;
tracking weight and weight goals;
displaying weight history;
tracking hydration;
providing fasting statistics and estimates;
displaying Health Connect information;
providing personalized fasting information;
generating meal plans when requested;
providing AI-assisted coaching when requested.
OneFast may also calculate information locally, such as fasting statistics, estimated calories burned or other progress indicators.
These calculations are intended for informational and wellness purposes.
Most OneFast information is stored locally on the user's device.
This includes information such as:
fasting history;
weight history;
hydration information;
meal plans;
AI coach conversation history;
fasting preferences;
age and height;
target weight;
other application preferences.
OneFast does not currently operate a OneFast backend server for storing this health information.
Health Connect information such as steps, sleep, heart rate and active calories is accessed when authorized and is not stored by OneFast in its local health database as a permanent history.
OneFast includes optional artificial intelligence features, including an AI coach and AI-assisted meal plan generation.
When the user chooses to use these features, certain information may be transmitted securely to OpenAI in order to generate the requested response.
When the AI Coach is used, information sent for processing may include:
messages entered by the user;
current weight;
weight progress information;
fasting status;
fasting schedule and timing information;
fasting history or statistics relevant to the coaching context;
fasting goals or related information.
This information is transmitted only as necessary to provide the AI coaching functionality requested by the user.
When AI-assisted meal plan generation is used, information sent for processing may include:
calorie targets;
nutrition goals;
dietary preferences;
cuisine preferences;
budget preferences;
number of days requested;
other parameters entered for meal plan generation.
OneFast does not sell health information to OpenAI or any other third party.
The transmission to OpenAI occurs for the purpose of providing the AI functionality requested by the user.
OneFast accesses Health Connect data only after the user explicitly grants the relevant permissions.
Depending on the permissions granted, OneFast may access:
steps;
sleep sessions;
heart rate;
active calories burned;
body weight.
Health Connect information is used to display health and wellness information within OneFast and enhance the user's personal tracking experience.
Health Connect data is not sold or used for advertising.
OneFast does not use Health Connect data for targeted advertising, advertising profiling or sale to data brokers.
Health Connect access can be revoked by the user at any time through the device's Health Connect or Android permission settings.
OneFast may process additional information necessary for specific features.
An optional email address may be stored locally on the user's device as part of the profile.
OneFast does not currently require users to create an online account.
For Ramadan-related functionality, the user may provide location information such as city and country, or location coordinates when applicable, to obtain prayer and fasting schedule information.
This information may be transmitted to the external service used to obtain the requested schedule.
OneFast may use the following external services for specific functions:
Used to provide optional AI coaching and AI-assisted meal plan generation.
Health, fasting, weight or nutrition-related information may be transmitted to OpenAI when necessary to provide these features, as described above.
Used, with the user's permission, to access selected health and fitness information.
Used to retrieve prayer and Ramadan schedule information. Location information required for the requested schedule may be transmitted to this service.
Used to process purchases and subscriptions through Google Play.
OneFast does not use advertising SDKs.
OneFast does not currently use third-party analytics or advertising services.
OneFast does not sell users' personal or health information.
Information is shared with third-party service providers only when necessary to provide a feature requested by the user.
This may include:
OpenAI for AI Coach and AI-generated meal plan functionality;
Health Connect for authorized health data access;
Aladhan for Ramadan and prayer schedule functionality;
Google Play for subscription and purchase processing.
The categories and purposes of data shared depend on the features actually used by the user.
OneFast does not use health information for advertising.
The application does not currently contain an advertising SDK and does not sell health or personal information for advertising or marketing purposes.
OneFast uses reasonable technical measures designed to protect information processed by the application.
Network communications with external services use secure encrypted connections where supported.
Most personal and health information is stored locally on the user's device, except when information must be transmitted to an external service to provide a feature explicitly requested by the user, as described in this Privacy Policy.
Most OneFast data is stored locally on the user's device.
Users can delete certain information directly from the application where a deletion function is available, including certain AI Coach history and meal plan information.
Users can remove locally stored OneFast data by clearing the application's storage/data through Android settings or by uninstalling OneFast.
Health Connect permissions can be revoked through Android or Health Connect settings.
Because OneFast does not currently require an online account and does not maintain a OneFast backend account database, there is no mandatory online OneFast account that must be deleted.
For questions concerning deletion or privacy, users may contact us using the email address below.
OneFast does not currently use Google Drive to store or synchronize health or personal data.
If cloud backup or Google Drive synchronization is introduced in a future version, this Privacy Policy will be updated to explain what information is transferred, how it is stored and how users can control or delete it.
OneFast is intended for general wellness and informational purposes.
OneFast is not a medical device and does not provide medical diagnosis, treatment or professional medical advice.
Health, fasting, nutrition and other information provided by OneFast should not be considered a substitute for advice from a qualified healthcare professional.
This Privacy Policy may be updated when OneFast features, data practices, third-party services or applicable requirements change.
The latest revision date will be displayed at the top of this page.
For questions regarding this Privacy Policy, health data processing or data deletion, contact:
kameltalbi.tn@gmail.com