Ken AI logo

Cold email copy tools

8 free tools that read a cold email the way a spam filter and a busy buyer do. Paste an email and see the risky words, the subject line score and the lines that read as AI. No signup.

SubjectQuick question about Northwind's outbound
Sample email, the checks below ran on it
Subject line first, then the body. Nothing is sent: every check runs in your browser.
Sample email, checked6 checks on one emailOpen a row for the full result
Cold email grader
6 checks to improve: spam words, formatting, links.
34/100
Spam words
2 never, 2 high, 2 medium. Over the budget.
6words
AI detector
6 AI tells. Reads mixed.
58human
Subject line
Ready to send. Generic subject.
82/100
Compliance
To a US recipient: way to opt out, postal address, claims you can back up. Not legal advice.
3to fix
Spintax
No spins. Add some to send different versions.
0spins
Grade
5 tools
Score and fix
Write
3 tools
Variants and lines

Grade

5 tools. Paste an email, get a verdict and the exact lines to change.
Cold email grader
Paste a cold email and get a score out of 100, the reason behind every lost point and a rewrite. Roast mode if you can take it.
Spam word checker
Highlights the words in your cold email that trip spam filters, by how risky they are, with a plainer word for each.
AI content detector
Shows how human your email, post or article reads, with every AI tell highlighted and a plainer line for each. It reads the text, never who wrote it.
Subject line tester
Scores your cold email subject line, shows it in Gmail and Outlook on desktop and phone, and suggests up to five better ones.
Cold email compliance checker
Checks your cold email against CAN-SPAM, GDPR, PECR and CASL and tells you what to add for each. Not legal advice.

Write

3 tools. Spin variants, personalize the first line and give your AI agent Ken's playbook.
Spintax generator
Write, check and expand spintax for your cold email, convert it between sending tools and preview random variants.
AI personalization
See the cold email Ken's AI would write to you: a personalized subject line, first line and PS in under a minute.
Cold email skills
Ken's cold email playbook as 10 free, open-source Agent Skills for Claude Code, Codex or any AI agent.
Ken writes and checks every email before it sends.
Human-built frameworks, AI personalization from real signals and a spam check on every line. Start free with 1,000 credits, no card.
Start free - 1,000 credits, no card

What the copy lab checks

Most cold email that fails was readable, polite and long. It just sounded like every other email in the inbox. The copy lab reads an email for the things that cost replies: spam triggers, AI tells, a subject line that gets cut off and a missing opt-out.

Check before you send

The cold email grader scores the whole email from 0 to 100 and shows the lines to change. The spam word checker highlights risky words by how much they hurt, with a plainer word for each. The AI content detector marks the lines that read as AI. The subject line tester shows how the line looks in Gmail and Outlook on a phone. The compliance checker covers CAN-SPAM, GDPR, PECR and CASL.

Write more versions

The spintax generator turns one email into many versions and checks the syntax your sending tool expects. The AI personalization demo shows a first line built from a prospect's real public signals, not a merge tag.

Questions

Is my email stored?
No. The rule checks run in your browser. The AI checks run only when you ask: they send the text to a model to score it and keep nothing. If you email yourself a report, Ken sends it and keeps your address with a short note of the result, not the report or your email.
Which models do the AI checks use?
In the checkers, scores and yes or no checks run on Jev, an evaluation model, and rewrites and alternatives run on DeepSeek V4.1 Flash. Both count against a small monthly budget per tool, so a tool can pause until the next month if it gets very busy.
Does a good score mean my email lands in the inbox?
No. Copy is one part. Your domain setup and sending volume matter as much. Run the domain health check on the domain you send from as well.

Other suites

67 free tools in 6 suites.
Deliverability
30 tools. Check a domain, test a mailbox, size the inbox fleet.
Prospecting
5 tools. From a website to an ICP, a market count and a checked list.
CSV tools
14 tools. Clean, combine and prepare a list in your browser.
Planner
10 tools. Calculators that open on a worked example.
All 67 free tools