Free toolsSmall tools.
Small tools.
Useful head starts.
Plan a campaign, sharpen a message, or make sense of a rate. These browser-based tools are open to everyone, without an account.
Useful on their own.
Better with your judgment.
Email rate calculators
Understand replies, bounces, and clicks
Subject line workshop
Make a clearer first impression
Email signature builder
A clean, copyable sign-off
Email copy review
Check clarity before you send
DNS record builder
Draft SPF and DMARC records
SPF lookup
Read the published sender policy
DMARC lookup
Inspect a domain’s published policy
DKIM lookup
Find a selector’s public key or alias
CNAME lookup
Read a host’s current alias
SSL checker
Inspect HTTPS certificate and TLS details
Blacklist checker
Review named public IPv4 blocklists
DKIM generator
Create signing keys locally, for free
Campaign planner
Turn an idea into a brief you can keep
Bring your own context.
Tell us what you are working on. Let’s find a useful next step.