Free Tools
Tools that ship faster.
Free, fast, no signup. Built for email senders who want answers in seconds, not signups.
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Subject Line Generator
Generate 20+ proven subject line variations from a topic - free, no signup.
Open tool FreeSpam Checker
Paste your subject + body. We flag the spam triggers that hurt your inbox rate.
Open tool FreeHTML Email Preview
Paste your HTML email and preview it instantly in a sandboxed frame.
Open tool FreeSend-Time Calculator
Find the best send time for your audience across timezones.
Open tool NEWEmail Header Analyzer
Paste raw email headers to identify SPF, DKIM, DMARC, routing delays and authentication issues.
Open tool