ZeroBounce VS NumValidate

NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.

Antideo - Email, IP address and phone number validation API service

Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI

Numverify - Global phone number validation and lookup API

DeBounce - Email Validation, Email Checker, Data Enrichment and Appending Tool. Using DeBounce remove invalid, disposable, spam-trap, syntax and deactivated emails.

RealValidito - Phone Validator | Free Phone Number Validation & Phone Number Lookup Service | Realvalidito