Interactive tools that compute the same reference numbers this blog's articles derive by hand — for your exact schedule, not just the twelve precomputed cases.
Compute correlation-aware alpha-spending boundaries for any interim look schedule — OBF-type, Pocock-type, or a moderate power-family style — instead of reading them off a static table.
Enter any mix of guardrail metrics — rate, revenue, or count, each with its own baseline and margin — and get the β/(G+1)-corrected power and the sample size the whole suite needs.