# ODEL guides

- [How to keep a blood pressure log on iPhone and bring it to your doctor](https://www.odel.dev/blog/keep-a-blood-pressure-log-on-iphone.md): A simple routine for recording blood pressure, pulse, blood sugar and weight on iPhone, and turning the readings into a PDF or CSV report for your appointment.
- [How to record with the front and back camera at the same time on iPhone](https://www.odel.dev/blog/record-front-and-back-camera-at-the-same-time-on-iphone.md): Record a video with both iPhone cameras in one take: choose a layout, set quality and lenses, change the layout after shooting, and export vertical and horizontal versions.
- [How to study with the Pomodoro technique on iPhone](https://www.odel.dev/blog/study-with-the-pomodoro-technique-on-iphone.md): Set up Pomodoro study sessions on iPhone: session length, breaks, a task list, background alerts and when to switch to an open-ended flow timer.