💡 AI Subject Lines, Rewriting And Inbox Score

Three AI helpers sit right inside the broadcast composer, where you need them: subject line ideas, writing and rewriting, and an inbox score.

They run on your own AI key from Claude or OpenAI, and when you have trained your voice in Train Your AI, the writing and subject lines follow your style. You always see the result before anything is saved or sent.

Where to find it:

Emails, then Broadcasts, then + New Broadcast (or Edit on a draft). On the Start here step, Generate variants sits under the Subject line, and Write with AI and Score sit in the row above the email body.

These features need an AI key. Add one in AI Setup, then AI Studio (see Connecting Claude Or OpenAI).

Subject lines and preheaders:

1. Write the email body first. The AI reads it, so the ideas match what you actually wrote.
2. If you already have a subject in mind, type it. The AI treats it as your intended angle and includes sharper versions of it.
3. Press Generate variants.
4. Ten suggestions appear under the subject. Each shows the angle it takes (curiosity, benefit, urgency, social proof, question, story, contrarian, list or news) and a matching preview text underneath.
5. Click a suggestion to put it in the Subject line. Its preview text fills Preview text (preheader) too, but only when that box is empty, so a preheader you wrote yourself is never replaced.

The AI is asked to keep each subject under 60 characters, to avoid spam-style phrases, and to stick to what is in your email, never inventing offers or numbers. It also looks at your past broadcasts with the best open rates, for style only.

Write with AI:

Write with AI opens a dialog. When the body already has text, it asks What should it do?:

• Rewrite my current draft: type your Instructions, such as "shorter, lead with the frost warning, end with the planner link", and pick a Tone.
• Write a new email (replaces draft): describe what the email is about, then pick a Tone and a Length.

The Tone choices are Conversational, Direct & punchy, Warm & friendly, Professional, Storytelling and Urgent. Length is Short (about 100 to 150 words), Medium (about 200 to 350) or Long (about 450 to 650).

Press Generate. The new text goes straight into the editor, so read it, change anything that does not sound like you, and check the preview. A rewrite keeps your merge codes and links.

Writing a new email from a brief:

With an empty body, the dialog goes straight to "What is this email about?". A good brief names the topic, the reader, the one thing you want them to do, and any facts the email must include. The AI writes one central idea, opens with a hook, uses {{first_name}} sparingly and ends with a single call to action.

Inbox score:

Score checks the subject and body together and shows a card under the buttons with a score out of 100 and a rating: Excellent (85 or more), Good (70 or more), At risk (50 or more) or High risk.

Underneath is a plain list of things worth fixing. The built-in checks look for:

• a subject longer than 70 characters,
• words in capitals, or more than one exclamation mark, in the subject,
• spam-style phrases in the subject, such as "act now" or "buy now",
• a very short body (under 50 words) or a very long one (over 800),
• more than 15 links, or lots of images with little text.

With an AI key set up, the AI also reads the email for spam-filter risks and adds its own points, each starting with "AI:". Press Dismiss to close the card. Fix what makes sense, press Score again, and the card updates.

A real example:

Anna writes the Leafwise "Frost prep" email about protecting six crops before the first frost.

1. She types a working subject, "Frost tonight", and presses Generate variants.
2. Among the ten ideas she picks a question angle, "Will your kale survive tonight?", and its preview text "Six crops to cover before dark" fills the empty preheader.
3. She presses Write with AI, keeps Rewrite my current draft, types "Shorter. Put the six crops in a list. Direct & punchy" and presses Generate.
4. She reads it, puts back one sentence she liked, and presses Score. The card shows Good with one point about the subject, which she fixes before sending.

Tips:

• The suggestions are a starting point. Pick the angle you like and make the words your own.
• Train Your AI with three or four of your best emails, so the writing sounds like you from the first draft.
• Score every promotional email. It takes a second and catches the obvious things.
• After sending, compare open rates on the report to learn which angles your readers like (see The Broadcast Report: Opens, Clicks, Sales And People).