What are some alternatives?
When comparing ListClean and DataValidation, you can also consider the following products
clearout.io - The easiest and real-time email verification and validation tool.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
DeBounce - Email Validation, Email Checker, Data Enrichment and Appending Tool. Using DeBounce remove invalid, disposable, spam-trap, syntax and deactivated emails.
Email Verifier - Email verifier app lets you verify email.
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
Bounceless - Bounceless.io offers a tool to clean, validate and verify email list.