Privacy Policy

MANTIS · Last updated: March 2026

Overview

MANTIS is a personal health and wellness tracking application developed by Noubyte. Your privacy is fundamental to how we built MANTIS. The app is designed with a local-first architecture — your data stays on your devices.

Data we collect

MANTIS collects the following types of data, all of which remain on your device or in your personal iCloud account:

• Health & fitness data — read from Apple Health with your explicit permission, including heart rate, HRV, sleep, workouts, steps, respiratory rate, and related metrics.
• Self-reported data — symptom logs, mood ratings, custom routines, and journal entries you create within the app.
• Nutrition data — meal logs and macronutrient data you enter or import.
• Profile information — your name and date of birth, used to personalise the experience.

How data is stored

All data is stored locally on your device. If you have iCloud enabled, your data syncs privately to your personal iCloud account via Apple's CloudKit. We do not operate servers that store your data. We cannot access, view, or retrieve your health information.

Third-party services

MANTIS uses two public nutrition databases for food lookups — the USDA FoodData Central API and Open Food Facts. When you search for a food, your search query is sent to these services. No personal or health data is included in these requests. No analytics, advertising, or tracking SDKs are included in the app.

Apple Health

You can modify Health permissions at any time in Settings → Health → Data Access & Devices → MANTIS. The app also writes workout data back to Apple Health when you complete a workout.

Scientific sources & methods

MANTIS is a wellness tool, not a medical device. Its estimates and suggestions are based on published research and public data sources. The same list is available inside the app under Settings → Sources & Methods, with a link next to the calculations it explains. Sources are provided for transparency and education, not as medical advice.

• Baseline metabolic rate — Mifflin MD, St Jeor ST, et al. Am J Clin Nutr. 1990;51(2):241–247. source
• Calorie target for a weight goal (~7,700 kcal/kg) — Hall KD. Int J Obes. 2008;32(3):573–576. source
• Protein target (1.6–2.2 g/kg) — Morton RW, et al. Br J Sports Med. 2018;52(6):376–384. source
• Maximum heart rate & zones — Tanaka H, Monahan KD, Seals DR. J Am Coll Cardiol. 2001;37(1):153–156. source
• Calories burned from heart rate — Keytel LR, et al. J Sports Sci. 2005;23(3):289–297. source
• Vigorous intermittent lifestyle activity (VILPA) — Stamatakis E, et al. Nat Med. 2022;28(12):2521–2529. source
• Sleep pressure & recovery timing — Borbély AA. Hum Neurobiol. 1982;1(3):195–204. source
• Chronotype — Roenneberg T, Wirz-Justice A, Merrow M. J Biol Rhythms. 2003;18(1):80–90. source
• Heart rate variability — Shaffer F, Ginsberg JP. Front Public Health. 2017;5:258. source
• Caffeine clearance (~5 h half-life) — EFSA. EFSA Journal. 2015;13(5):4102. source
• Supplement information — NIH Office of Dietary Supplements fact sheets. source
• Food & nutrition data — USDA FoodData Central (source) and Open Food Facts (source).

Data deletion

You can delete all MANTIS data at any time from Settings → Erase MANTIS database. Apple Health data is not affected.

Contact

If you have questions, contact us at noubyte@absan.de.