Free Email Marketing Tools
Eight free utilities we built for marketers, plus the partner tools Carlos personally uses to run BestSends. Every tool is free; no signup required unless noted.
Built by BestSends
Free, no-signup tools that complement your email marketing platform.
Email Verification
Validate single addresses and full lists. Catch typos, role accounts, and disposable domains before you send.
Open toolSubject Line Tester
Score any subject line for length, spam triggers, emoji weight, and predicted open rate. Free, no signup.
Open toolEmail ROI Calculator
Forecast revenue from your list size, send frequency, average order value, and conversion rate.
Open toolSend-Time Predictor
Estimate the best send window for your audience based on timezone mix and industry benchmarks.
Open toolGDPR Consent Checker
Audit your signup form against GDPR + CAN-SPAM consent requirements in 60 seconds.
Open toolESP Migration Estimator
Estimate hours, cost, and risk to migrate from your current ESP to a new one based on list size and automation depth.
Open toolDeliverability Quick-Check
Paste a sending domain and get an instant SPF, DKIM, DMARC, and BIMI status report.
Open toolSpam Score Predictor
Paste your subject + preview text and get a 0–10 spam likelihood score using the same heuristics as SpamAssassin.
Partner tools we recommend
Third-party software we have tested and pay for. Affiliate disclosure →
List Cleaner — Bouncer
The list-cleaning service we recommend after testing 6 alternatives. Catches 99%+ of invalid addresses with zero false positives in our tests.
Try it free Affiliate linkInbox Triage — SaneBox
AI inbox triage that hides low-priority email so you can focus on what matters. Carlos uses this daily.
Try it free Affiliate linkFree Sending Domain — Resend
Best free transactional sending tier we tested (3,000 emails/mo). No credit card required.
Open tool