Overview
This policy explains what information Calister collects, how it is used, and the choices you have. Calister is a personal nutrition and calorie tracking app, and protecting the data you trust us with is core to how we build it.
Information we collect
Account details (such as your email address); profile information you provide (name, gender, height, weight, and goals); nutrition data you log (meals, portions, macros, water, and activity); optional photos of food or barcodes you submit for recognition; optional voice recordings used to transcribe what you say into text; and, if you choose to connect Apple Health on an iPhone, the steps, calories, workouts and body weight it holds, or Health Connect on Android, the steps and body weight it holds. We also collect basic technical data needed to keep the app stable and to send reminders at the right time: device type, app crash diagnostics, your device’s time zone and language, and your reminder settings.
How we use your information
We use your data to power meal logging, nutrition scoring, streaks, progress tracking and calorie goal suggestions; to sync your data across your devices; to send the reminders and notifications you can turn off in Settings (meal reminders, the weekly recap and weigh-in reminders, and a few messages if you stop logging for a while); to provide customer support when you contact us; and to diagnose and fix crashes or errors. We do not use your personal data for purposes unrelated to operating and improving Calister.
Third-party services
We rely on trusted providers to run the app: Supabase hosts our database, authentication, and file storage; RevenueCat manages subscriptions and purchases; OpenRouter passes food photos, meal descriptions and chat messages to the AI model providers it works with, to recognise food and estimate nutrition; Speechmatics transcribes voice recordings into text; Resend delivers account emails; Firebase delivers push notifications; Sentry helps us detect and fix crashes; and PostHog helps us understand how the app is used so we can improve it. Apple Health, if you connect it, is accessed directly on your device under Apple’s own privacy controls: Calister reads steps, calories, workouts and body weight, and writes the food energy, macros, saturated fat, sugar, fiber and sodium, water and weigh-ins you log. Data read from Apple Health stays on your device unless you choose to log it (for example, a weight from your smart scale); it is used only to provide these features, never for advertising or marketing, and is never sold. You can change these permissions at any time in the Health app. Health Connect on Android, if you connect it, also works directly on your device: Calister reads steps and body weight, and writes the food energy, macros, saturated fat, sugar, fiber and sodium, water and weigh-ins you log. Data read from Health Connect stays on your device unless you choose to log it, is used only to provide these features, is never used for advertising or marketing, and is never sold or transferred to third parties. Calister's use of information received from Health Connect adheres to the Health Connect Permissions policy, including its Limited Use requirements. You can change or withdraw these permissions at any time in Health Connect, or by removing the fitness tracker in Calister's settings. These providers only receive the data needed to perform their function, and we do not sell your personal data to anyone.
AI processing
To recognise food and estimate its nutrition, Calister uses third-party artificial intelligence services. When you log food with a photo, your voice or a written description, write in the chat, or when the app prepares an analysis of your meals or your week, the photos, voice recordings, food descriptions and chat messages you share — together with the diary and profile details an answer needs (for example your recent meals and goals) — are sent to language models through OpenRouter, and voice recordings are sent to Speechmatics to be transcribed. We send this data only so that you get an answer; we do not sell it and do not use it for advertising. AI estimates can be wrong, so check anything important. By using these features you agree to this processing. If you do not want this data sent, do not use photo, voice or description logging or the chat: food can also be added through the catalogue search, by barcode, or by entering the values yourself.
Data retention and deletion
We keep your data for as long as your account is active so the app can work as intended. If you use Calister without creating an account (as a guest) and do not open it for 60 days, the guest account and its data are deleted automatically. You can permanently delete your account and all associated data at any time from Settings > Delete account, or by emailing us. Deletion is immediate and cannot be undone.
Your rights
You can access, correct, export, or delete your data at any time. Settings > Export my diary creates a CSV file of the food, water, activity and weigh-ins you have logged and hands it to your phone’s share sheet — Calister does not send the file anywhere; where it goes is up to you. Most other changes can be made directly in the app under Settings; for anything else, contact us and we will assist you.
Security
Your data is encrypted in transit, and database access is restricted so that you can only read and write your own records. We continually work to keep these protections up to date.
Children’s privacy
Calister is not directed at children under 16, and we do not knowingly collect personal information from children. If you believe a child has provided us with personal data, please contact us so we can remove it.
Changes to this policy
We may update this policy from time to time to reflect changes to the app or applicable law. Continued use of the app after an update constitutes acceptance of the revised policy.
Contact us
Questions about this policy or your data? Email us at aliksui.ua@gmail.com.