Check a subject line for length on phones, spam-trigger words, shouting and broken merge tags

After: what comes back

The first lines of a real run on that input. Nothing here is edited by hand.

Subject: "FREE gift for {{first_name}}!!! Act now - {{ discount"
53 characters, 9 word(s)

- [high] Unbalanced or malformed placeholder braces. The send would expose raw template code or fail. Fix: Fix the open and close markers so every opener has a closer.
- [medium] Spam-trigger wording: free, act now, discount. Filters weigh many signals, so one word rarely sinks a message, but several together do. Fix: Say the concrete thing instead of the sales phrase.
- [medium] Repeated or multiple exclamation or question marks. Fix: One mark at most.
- [medium] Placeholder {{first_name}} has no fallback. If the field is empty, the subscriber sees "Hi ," or a raw tag. Fix: Set a default such as {{first_name | default: "there"}} (syntax depends on your ESP), or write a subject that works without it.
- [low] 53 characters; fine on desktop, likely cut on phones after about 30 to 45 (estimate). Fix: Put the key words first.
- [low] All-caps word(s): FREE.
- [info] Placeholders found: {{first_name}}. Test with an empty value before sending.
... full output on the tool page