Home & Utilities Guides, Tools & Apps

Useful calculations and everyday device helpers.

Small utilities are most useful when they make their inputs and limits clear. A calculator should tell you the units it expects; a remote-control app should explain which devices and network setup it supports. Before depending on a result, try a simple example you can check independently. An estimate is useful when you know what has been left out.

Keep a distinction between a measurement and a calculation. Entering a photo’s pixel dimensions cannot reveal the exact size of a compressed JPEG, and typing a percentage cannot confirm the original price. Check permissions before connecting a utility to nearby devices or personal information. The tools here display their assumptions so you can decide whether the result fits the task in front of you.

Use the guides below for a specific task, then follow the related tools and apps when they fit your workflow. Each article links to its sources and separates a general explanation from instructions that depend on a particular app or device.

Common Problems

The app cannot access the expected device or data

Check its documented compatibility, connection, and permission requirements.

A result needs verification

Compare it with the original input or a suitable authoritative source. An app result does not automatically establish that a label, estimate, or record is correct.