Free Cold Email Tools
Ten browser-based tools for B2B cold email — built to fix copy, lift deliverability, and prove ROI. No signup, no limits, no data sent anywhere.
Write & score
Lift open and reply rates by sharpening your copy.
Email Copy Analyzer
Score cold email body across 6 dimensions — personalization, structure, CTA, tone, length, value prop.
OpenSubject Line Tester
Score subject lines for length, spam words, power words, emoji, and readability.
OpenSpam Words Checker
Paste your email — see spam triggers, ALL CAPS, and punctuation issues highlighted with a risk score.
OpenEmail Template Builder
Pick one of four proven frameworks, fill in your details, and copy a ready-to-send template.
OpenInfrastructure & deliverability
Get your emails into the inbox, not the spam folder.
Email Authentication Checker
Check SPF, DKIM, DMARC and MX records for any domain. Powered by Google DNS — no API key.
OpenEmail Warmup Calculator
Generate a custom warmup schedule based on domain age, provider, and sending history.
OpenLead List Validator
Paste emails — get syntax checks, role-based detection, disposable domain flags, and a status report.
OpenPlan & measure
Set up timing, signatures, and prove ROI.
Send Time Optimizer
Find the best time to send cold emails based on timezone, industry, and recipient role.
OpenSignature Generator
Create a clean HTML email signature for Gmail, Outlook, and Apple Mail in under a minute.
OpenROI Calculator
Model your cold email campaign from sends to closed deals. Estimate revenue, profit, and ROI.
OpenBuilt for B2B Cold Email — Not Email Marketing
Cold email is a different motion than newsletters or promotions. These tools encode what works for outbound to people who haven't asked to hear from you.
Browser-based, private
Every tool runs entirely in your browser. Your email text, domain lookups, and lists never leave your device.
Opinionated benchmarks
Scoring is calibrated for B2B cold outreach — not generic email marketing. The defaults reflect what actually moves reply rates.
No signup, no limits
Free forever. Use them daily. We built them because we use them ourselves — for our own clients' campaigns.
A Sensible Order to Run Them In
For a new cold email campaign, work top to bottom.
1. Authenticate
Run the Auth Checker first. Fix SPF / DKIM / DMARC before sending a single email.
2. Warm up
Get a custom warmup schedule from the Warmup Calculator. Follow it without skipping.
3. Validate the list
Clean your prospect list with the Lead List Validator. Remove invalid and disposable addresses.
4. Build the template
Pick a framework with the Template Builder. Customize for your offer.
5. Test the subject
Score with the Subject Line Tester. Aim for 80+ before sending.
6. Score the body
Run the Copy Analyzer on the email body. Aim for B grade or higher.
7. Spam check
Run the final copy through the Spam Checker. Aim for Low Risk (under 20).
8. Schedule & measure
Use the Send Time Optimizer to pick the slot, then track results with the ROI Calculator.
Want us to run cold email for you?
We built these tools because we use them — for B2B teams running outbound at scale. Get a free audit on your current setup.