Dayhack: Biohacking Journal
Food, sleep, training, urges
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
A biohacking journal without calorie counting: food, sleep, training and urges in one place. Your seven-day review is free.
Dayhack is a biohacking journal: a food diary without calories, a sleep journal and a workout log in one app. Write down what you eat, how you trained, how you slept and the urges you held, then see what you actually did this week and choose your next step. In English, French, Spanish, German, Italian and Portuguese.
FOOD DIARY WITHOUT CALORIES
Log meals with foods, quantities, portions and how you feel. Dayhack does not estimate calories and does not give you a health score. If you prefer mindful or intuitive eating to counting, your meal history simply shows your own entries.
SLEEP JOURNAL AND MORNING ENERGY
Record bedtime, wake time, sleep quality and energy. The sleep diary uses the times and feelings you enter. It does not measure sleep stages.
WORKOUT LOG
Prepare strength or cardio sessions and record exercises, sets, reps, loads and durations. An unfinished workout stays at the top of Today. Look back at your training history before the next session.
URGE AND CRAVING TRACKER
Choose what you want more control over, such as screen time, nicotine, alcohol or gambling. Note your triggers, pick an alternative and reflect on what helped. A pause or a lapse does not erase earlier progress.
FOUR TABS, ONE ROUTINE
Today, Meals, Training and Recovery, where sleep and urges sit side by side. Focus and reflection tools sit alongside them, and reminders are optional.
YOUR WEEK IN REVIEW
The free seven-day review brings together meal entries, completed workouts, best recorded sets, sleep and craving ratings. Dayhack Plus unlocks 30-day, 90-day and 365-day reviews and a readable text export. Choose a monthly or yearly subscription, or a one-time lifetime purchase. Subscriptions renew automatically until you cancel in your store account settings, at least 24 hours before renewal. Core features and standard data export stay free.
YOUR DATA
Your journal entries are stored on your device. No account and no sign-up. You choose what to export or share.
IMPORTANT
Dayhack is not a medical device and does not diagnose, treat, cure or prevent any condition. It does not treat addiction or provide withdrawal protocols. Stopping alcohol or sedatives suddenly can be dangerous, so seek medical advice before changing your use. For health concerns, talk to a healthcare professional.
Terms of Use: https://victorlaybats.com/apps/elyro/terms/
Privacy Policy: https://victorlaybats.com/apps/elyro/privacy/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Takehold is now Dayhack: the same app with a new name. A biohacking journal for food without calories, sleep, training and urges. Plus comes monthly, yearly or for life, and the yearly plan now starts with a 7-day free trial. Six languages.
The developer, Victor Laybats, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Victor Laybats
- Size
- 55.3 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- French
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Alcohol, Tobacco, Drug Use or References
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Takehold Plus yearly $29.99
- Takehold Plus monthly $4.99
- Takehold Plus $59.99
- Copyright
- © 2026 Victor Laybats