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By signing in you agree to our Privacy Policy and Terms of Service.

Before you continue

PenSplit™ needs your consent to store and process the following data.

* Required. Your health data is stored on EU servers (Germany) and never sold to third parties. You can request deletion at any time by emailing privacy@pensplit.com.

Privacy Policy

PenSplit™ — Privacy Policy
Last updated: May 2026. Operator: [Your Company Name], registered in Poland.

1. Data we collect

When you create an account, we collect:

  • Email address (optional — used only for login and notifications)
  • Authentication credentials (Passkey public key — no passwords stored)
  • Injection records: medication name, dose, date/time, injection site, notes
  • Weight entries: date and weight value
  • App settings and preferences

2. Legal basis (GDPR)

  • Health data (injections, weight): Art. 9(2)(a) GDPR — your explicit consent
  • Account data: Art. 6(1)(b) — contract performance
  • Email communications: Art. 6(1)(a) — consent

3. Data storage

All data is stored on secure servers located in Germany (Hetzner Online GmbH, EU). Data is encrypted in transit (TLS 1.3) and at rest. We do not transfer data outside the EU.

4. Your rights

  • Right of access — request a copy of your data
  • Right to rectification — correct inaccurate data
  • Right to erasure ("right to be forgotten") — delete your account and all data
  • Right to data portability — export your data as JSON
  • Right to withdraw consent — at any time, without affecting prior processing

5. Data sharing

We never sell your data. We use the following processors:

  • Hetzner Online GmbH (hosting, Germany)
  • Resend Inc. (email delivery — receives only your email address)
  • Stripe Inc. (payments — receives only payment data, not health data)

6. Retention

We retain your data for as long as your account exists. After account deletion, data is permanently removed within 30 days.

7. Contact

For privacy requests: privacy@pensplit.com


PenSplit™ — Polityka Prywatności
Ostatnia aktualizacja: maj 2026. Operator: [Nazwa firmy], zarejestrowana w Polsce.

1. Zbierane dane

Przy założeniu konta zbieramy:

  • Adres email (opcjonalny — wyłącznie do logowania i powiadomień)
  • Dane uwierzytelniające (klucz publiczny Passkey — bez haseł)
  • Rejestry zastrzyków: lek, dawka, data/godzina, miejsce iniekcji, notatki
  • Wpisy wagi: data i wartość
  • Ustawienia aplikacji

2. Podstawa prawna (RODO)

  • Dane zdrowotne: Art. 9 ust. 2 lit. a) RODO — wyraźna zgoda
  • Dane konta: Art. 6 ust. 1 lit. b) — wykonanie umowy
  • Komunikacja email: Art. 6 ust. 1 lit. a) — zgoda

3. Przechowywanie danych

Dane przechowywane są na serwerach w Niemczech (Hetzner Online GmbH, UE). Transmisja szyfrowana TLS 1.3. Dane nie są przekazywane poza UE.

4. Twoje prawa

  • Prawo dostępu, sprostowania, usunięcia, przenoszenia danych
  • Prawo do cofnięcia zgody w dowolnym momencie
  • Prawo wniesienia skargi do PUODO (Urząd Ochrony Danych Osobowych)

5. Kontakt

W sprawach prywatności: privacy@pensplit.com

Terms of Service

PenSplit™ — Terms of Service
Effective: May 2026

1. Service description

PenSplit™ is a calculation aid for GLP-1 medication dosing. It is not a medical device and does not constitute medical advice.

2. Medical disclaimer

Always follow your prescriber's instructions. Never adjust your dose without consulting a qualified healthcare professional. The developers accept no liability for dosing errors or adverse outcomes. Use entirely at your own risk.

3. Account

You are responsible for maintaining the security of your account. You must be at least 18 years old to create an account.

4. Intellectual property

PenSplit™ is a trademark of KOSIK.UK. All rights reserved. Mounjaro®, Ozempic®, Wegovy® are trademarks of their respective owners.

5. Termination

You may delete your account at any time. We may suspend accounts that violate these terms.

6. Governing law

These terms are governed by Polish law. Disputes shall be resolved in Polish courts.


PenSplit™ — Regulamin
Obowiązuje od: maj 2026

1. Opis usługi

PenSplit™ jest narzędziem obliczeniowym do dawkowania leków GLP-1. Nie jest urządzeniem medycznym ani poradą medyczną.

2. Zastrzeżenie medyczne

Zawsze stosuj się do zaleceń lekarza prowadzącego. Nigdy nie zmieniaj dawki bez konsultacji z lekarzem. Twórcy nie ponoszą odpowiedzialności za błędy dawkowania. Korzystasz wyłącznie na własne ryzyko.

3. Konto

Musisz mieć ukończone 18 lat. Jesteś odpowiedzialny za bezpieczeństwo swojego konta.

4. Prawo właściwe

Regulamin podlega prawu polskiemu. Spory rozstrzyga sąd właściwy dla siedziby operatora.

How many clicks?

Select your pen, then enter the dose you want to inject.

Step 1 — Which pen?
Pen strength (shown on your box):
Step 2 — What dose do you want to inject?
Enter your desired dose in milligrams:
mg

Click Counter

Tap once per click, or use the microphone to detect clicks automatically.

0
of ?
🎉 Done! Put the cap back on.
MICROPHONE — HOLD PEN NEAR PHONE
Ready
Sensitivity 6

Place phone on a flat surface. Slowly turn the pen dial nearby. Each click is detected automatically.

History

Track injections and weight. Sign in to sync across devices.

Log Injection
Injection Log
Weight Log
Export / Import

Export your data to transfer between devices. Apple Health integration coming in the native iOS app.

Settings

Your defaults. Used for suggestions and countdown.

Your Defaults
days

Settings are saved locally. The app will suggest the opposite side of your last injection and show a countdown to your next dose.

About PenSplit™
Project concept
Marcelina Podniestrzańska
Developed by
Jakub Rene KosikKOSIK.UK
Copyright
© 2026 KOSIK.UK
Version
v1.2 · 2026

⚠ Medical Disclaimer

Use Offline on iPhone
1
Open in Safari (not Chrome)
2
Tap the Share ⎋ button at the bottom
3
Tap "Add to Home Screen"
4
Tap "Add" — PenSplit™ appears on your home screen
Works fully offline after first load!

Formula Reference
Mounjaro® clicks = (desired ÷ pen strength) × 60
Volume = desired ÷ concentration (mg/mL)
U-100 units = volume × 100
U-40 units = volume × 40

Privacy & Data

CookiesNone
StorageDevice only
ServersNone

📱 Native App — Coming Soon

Coming Soon
App Store
Coming Soon
Google Play

Trademark & IP