How often the #1 for you changes
Every Monday the engine is replayed for every saved decision. When a different product takes #1 in that decision's Fit rank, that is drift. The percentages below show — anonymized, aggregated — how often each category's answer has shifted in the last 30 days.
A category with high drift (say, 20%+) is volatile — fees, licenses, or product positioning are moving fast enough that yesterday's winner often isn't today's. A category with low drift is stable: the right answer is durable.
If you saved a decision and its #1 for you has changed, the drift watcher has already sent an email. If you haven't saved one, the next time you take the quiz the answer reflects the current state — not whatever was true at the last review.