Guides and comparisons
What we learned building the apps, written out plainly. No sign-up, no newsletter — just the answer.
432 Hz vs 440 Hz: what concert pitch actually is
Why A4 is 440 Hz, where the 432 Hz claim comes from, what the evidence does and does not show, how big the difference really is in cents, and how to hear both for yourself with a tone generator.
Brown, pink and white noise: what the colours mean
What white, pink and brown noise actually are, how the spectrum differs, which one people pick for sleep, focus or tinnitus, why looping tracks get annoying, and how loud is too loud for a whole night.
Box breathing, step by step
The 4-4-4-4 box breathing pattern explained: the four counts, how long to practise, where the Navy SEAL story comes from, how it differs from 4-7-8 and coherent breathing, and when to stop.
4-7-8 breathing, step by step
The 4-7-8 breathing pattern explained: the counts, how many rounds, why the long exhale matters, how it compares with box breathing and coherent breathing, and when to stop.
How to tune a guitar with your phone
Standard tuning note by note, what cents mean, why you tune up to the note instead of down, and the most useful alternate tunings: Drop D, DADGAD, Open G, Open D and E flat.
Your Mac keeps going to sleep. Here is how to stop it
Why a Mac sleeps in the middle of a render, download or backup, what the Energy Saver settings actually control, and the three ways to keep it awake: System Settings, the caffeinate command and a menu bar app.
How to move photos from an Android phone to a Mac
Four ways to get photos and videos off an Android phone onto a Mac: USB cable, Wi-Fi, cloud sync and an SD card reader. What each one costs you in time, quality and privacy.
Keep a Mac awake: caffeinate, Amphetamine or Valpas?
Three ways to stop a Mac from sleeping during a render, upload or backup: the built-in caffeinate command, the Amphetamine app and Valpas. What each does with the lid closed, on battery, and when the job runs long.
Android File Transfer is gone. Here is what to use on a Mac instead
Google discontinued Android File Transfer for macOS in 2024. A plain comparison of Android File Transfer, Conduit, OpenMTP and MacDroid: connection, file size limits, previews, search, Wi-Fi and setup.