Superhuman

Superhuman redefines email speed with sub-100ms response times for every action, keyboard shortcuts, and AI that writes, summarizes, and triages messages. Its $30/month cost includes mandatory one-on-one onboarding via a 30-minute video call—a controversial yet effective approach that yields a Net Promoter Score of 58, notably higher than the iPhone's 47. Users report saving over 4 hours weekly on email, which justifies the fee for founders, VCs, and executives who value time at more than $30/hour. Superhuman raised $633 million, outperforming #10 1Password's valuation by over $500 million, but its niche appeal limits broader adoption compared to cheaper tools on this list.