Predicted vs. confirmed ovulation

Ovulation prediction tools (like LH tests) tell you ovulation is probably coming in the next day or so. They look forward.

Confirmation is retrospective. A sustained rise in basal body temperature of about 0.3–0.5°C tells you ovulation has already happened. The temperature shift is the textbook confirmation.

This app confirms ovulation only after it sees that biphasic temperature shift and/or a recorded LH peak — and it labels confirmed signals as higher-trust than any prediction.