Get BounceBuster.
A real desktop app for macOS and Windows. Free up to 600 emails a month, no account required. Your lists are validated on this machine and nowhere else.
macOS
Big Sur 11+ · Apple Silicon & Intel
Windows
Windows 10 or later · x64 (runs on ARM64 via emulation)
Free tier: 600 emails / month, no account.
Need unlimited? Get Professional for $19 →Frequently asked questions
Does BounceBuster work offline?
BounceBuster runs locally on your machine. Format and syntax checks work fully offline. DNS and MX validation needs an internet connection to query mail servers in real time, but your email list itself never leaves your computer.
Is my data safe?
Yes. Your lists are processed 100% locally; nothing is uploaded to any server. No cloud, no API calls, no data sharing. Your lists stay on your drive, period.
What platforms are supported?
macOS (11 Big Sur or later, Apple Silicon & Intel) and Windows (10 or later, x64 and ARM64).
What file formats can I import?
CSV and Excel (.xlsx). BounceBuster auto-detects the email column and exports cleaned lists in the same format.
Is there a money-back guarantee?
Yes. If BounceBuster doesn't meet your needs, contact us within 30 days of purchase for a full refund, no questions asked.