AlsoAsked
4/5
Strong public usage proof from registered-user, search, and result counters plus recognizable customer logos.
The homepage showed 115,262 registered users, 10,266,677 user searches, 312,207,549 results, and logos including Tripadvisor, Lego, Deloitte, Gymshark, Nerdwallet, Oracle, Indeed, Ikea, Riverside, and KPMG.
ProRankTracker
4/5
The official feature page states that more than 60,000 SEOs, SEMs, and website owners trust PRT; no larger independently verified customer count was used.
The worldwide-recognition section says PRT is trusted by over 60,000 SEOs, SEMs, and website owners: https://proranktracker.com/features