How to use
Pick a tool from the list above. Each page explains how to use it and how the results are worked out.
Frequently asked questions
Are the tools free?
Yes. All tools are free to use, with no account required. Ads help support the site, and Google Analytics measures site traffic.
Can I use these on my phone?
Yes. Open any tool in your phone's browser. There's no app to install.
Where should I start?
Choose a tool from the list. Each page has instructions and explains how its results are calculated.