Email Subject Line Tester

What you get

Score any subject line for length, spam words and curiosity before you hit send.

Highlights

• Instant score out of 100
• Flags common spam trigger words
• Checks length, caps and curiosity
• Works offline

Format & delivery

Delivered as a HTML app. Open it in any modern browser — no install, no account, no server. It works offline, and the file is yours to keep.

Immediately after your Lightning payment settles, the download link appears at checkout. No account, no email, no waiting for a message.

How buying works

Pay from any Lightning-enabled Bitcoin wallet. The checkout creates an invoice for the fixed USD price and unlocks the file when the payment settles. An on-chain fallback is available. If you do not have Bitcoin yet, the no-card guide explains the shortest route.

Category: Marketing Social · Product ID: subject-line-tester