Your estimate, live on your phone.
Enter what you took and when — Clearhead shows the recovery curve, detection windows, and a live countdown until the effects likely fade.
See when you clear
Enter what you took and when. Clearhead shows the effect timeline, your estimated blood level against the legal limit, and saliva & urine detection windows — not one meaningless number.
Track it live
Log a dose and watch a live countdown until the effects likely fade — across multiple doses at once, with a notification when each milestone passes.
Backed by published science
Every estimate cites the primary studies behind it. Clearhead is honest about its limits — and busts the myths (exercise, water) that other tools quietly repeat.
Free to download. Yours to keep private.
Try every feature live right after you install — 5 full estimates a month free, and all safety guidance is always free. Premium unlocks unlimited estimates, extra charts and live tracking.
Not a medical device · Not permission to drive · The safest choice is always none.