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Two tools, no email field
Both of these run entirely in your browser. Nothing you type is stored, sent to us, or traded for your result.
Arithmetic
Screen time calculator
Your daily average as days of the year, and as the hours between today and your exam date. Your numbers, worked out in your browser.
Open the calculatorSelf-checkIs my phone use a problem?
Ten questions from a published research scale, scored on your phone. A screening questionnaire, not a diagnosis — and it says so when it disagrees with you.
Take the self-checkMake the undo cost a walk.
Spark locks the apps you choose in one tap, and keeps the unlock on a key you leave in another room. Free app, one-time key, and calls always get through.