Enter your last run of sessions. This works out whether your hit rate is doing something luck wouldn't, and says so in plain words. Nothing is stored and nothing is sent anywhere. The numbers never leave this page.
If you check this after every session and stop as soon as the number finally looks good, you will cross the line by luck eventually. That isn't a signal. That's shopping for one.
Decide how many sessions you're running before you start, run all of them, then look once at the end. It is the least fun rule in practice work and the only one that makes the answer mean anything.
It tells you whether a run of hits is unusual for the pool size you were working with. That is all. It can't tell you why a run is unusual, and one good run is not a result. What settles it is a long record kept honestly, scored the same way every time, including the sessions you'd rather forget.
Maybe it's noise. Maybe it isn't. This is how you'd actually find out.
How to score a session without fooling yourself → A short field guide to keeping a record that will still mean something in six months.
This page answers the question once. Aperture answers it continuously, from your own logged sessions, and scores them for you so the judging isn't yours to fudge. Blind targets, a sealed impression, then the reveal. Everything stays on your phone.
Aperture is the practice journal this calculator came out of. Blind targets, a sealed impression, then the reveal, with the scoring done for you so it isn't yours to fudge. Leave an address and we'll send you the field guide to scoring a session honestly, plus the occasional note when we have something worth reading.