Most flow tools show you a firehose. This one reads all 12,000 US stocks overnight and keeps the few worth trading, ranked with a clear level on each, before the open.
Free, no signup: yesterday's top options flow, a congress trades feed, dealer gamma and a page for every big ticker.
Paid: $20/month with a 7-day free trial. It adds the nightly ranking and a trade plan on each idea.