Try the tool
Runs in this page. Your inputs are not uploaded or saved. Dates use your browser’s time zone.
Your result
State who made the checks, when they happened, and what remains. The tool produces your written note, not an authenticated app receipt.
A worked example
Sam recorded the Front door and Windows checks at Home at 8:46 AM. A separate Still to check section lists an outstanding Back window.
Be specific about unfinished work
Do not imply the whole place was checked if an item remains. Avoid adding access codes or other private instructions to a note that could be forwarded.
Keep the next check on your iPhone
Create the items manually in Is It Locked?. This browser draft does not transfer into the app. Check the items yourself, then record them.
Get the app freeiOS 27 or later. One place and one list are free.
The app records what you checked. It does not lock doors, switch off appliances, or verify their physical state.
Sources and review notes
Calculation conventions and boundary cases are documented above. The tool runs locally and is tested against arithmetic and calendar examples.