Subject line checker
Score length, personalization, spam-trigger language, question usage, and urgency with immediate feedback.
Check a subject line →Free email toolsFree email tools
Free email tools
for safer sending.
Check your copy, your domain authentication, your warm-up plan, and your bounce rate before you send. Every tool is free and needs no signup.
Five quick pre-send checks
Use each result as an editing prompt; inbox placement still depends on your sender reputation and list quality.
Spam word checker
Paste an email body to highlight known trigger phrases and see a low, medium, and high-severity count.
Scan email copy →SPF, DKIM & DMARC checker
Look up a domain's email authentication records and get plain-English fixes for anything missing or weak.
Check a domain →Email warmup calculator
See the day-by-day ramp to your target volume and how many mailboxes you need to hit it.
Plan a warm-up →Bounce rate calculator
Work out hard, soft, and total bounce rate and see how close you are to the thresholds that hurt sending.
Check a bounce rate →Useful before the sequence
Copy checks help you edit. InboxJoy handles the next operational steps.
Start with a clear idea
Use the subject checker to remove avoidable friction before building the rest of the message.
Scan the full body
Use the spam-word checker to find loaded phrases and decide whether each one is necessary in context.
Move into InboxJoy
Connect Gmail or Outlook, add the copy to a sequence, and control sending by mailbox.
Ready to turn the copy into a sequence?
Choose Monthly to try InboxJoy for seven days.
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