Sundown · last updated 10 August 2026
By downloading or using Sundown you agree to these terms and to Apple's Licensed Application End User License Agreement, which applies to this app in full.
Sundown estimates how much caffeine is in your body using published serving amounts and standard pharmacokinetics, and tells you when a drink would still be with you at bedtime. Caffeine content varies with bean, grind, brand and preparation, and people clear caffeine at very different rates, so every figure in the app is an estimate.
Sundown is information, not medical advice. It does not diagnose, treat or prevent anything. Do not use it to make decisions about medication. If you are pregnant, have a heart condition, or have any concern about caffeine, talk to a clinician.
Purchases are handled by Apple, so refunds are requested from Apple at reportaproblem.apple.com. We cannot issue refunds ourselves.
Your caffeine log is yours and stays on your device. We claim no rights over it.
Sundown is provided "as is", without warranty. To the extent permitted by law we are not liable for any loss arising from use of the app or reliance on its estimates.