You've sent dozens of emails. Some crushed it. Some got ignored. This prompt pulls your top performers, spots the patterns, and hands you five new subject lines built on what already works for your specific audience.
Most founders treat email subject lines like a guessing game. They write something that sounds good, hit send, and move on. The open rate comes in and the cycle repeats with no real learning happening.
The problem is not that the data does not exist. Your Kit account has everything you need. Pulling it, organizing it, and reading the patterns used to take hours and a spreadsheet. With Claude connected to your Kit account through Cowork mode, that analysis takes about 30 seconds.
You paste one prompt, and Claude reads your broadcast history, ranks your top performers, compares your best and worst subject lines side by side, and generates five new subject lines tailored to your actual patterns. Not generic best practices. Yours.
In Cowork mode, open your plugin settings and find the Kit connector. Authorize it with your Kit API key if you have not connected it yet. Once connected, Claude can read your full broadcast history directly. To verify, type "How many broadcasts have I sent in the last 90 days?" into a new Claude conversation. If Claude returns a number, you are ready.
Open a new Claude conversation in Cowork mode and paste the prompt below exactly as written.
Pull my top 15 broadcasts ranked by open rate over the last 90 days. Compare the subject lines from my five highest-performing emails against my five lowest. What patterns separate the ones that performed from the ones that did not? Write five new subject lines for me based on what you find in the winners.
Claude will return a ranked list of your broadcasts and a comparison of what your top five subject lines share in terms of length, format, tone, and curiosity gaps, alongside how the bottom five differ. Read this section slowly. The characteristics Claude calls out are the ones to build your next subject lines around.
Copy them into a running subject line document or paste them directly into your Kit drafts. Use them for your next five broadcasts and note how they perform against your historical average.
Set a calendar reminder for 90 days from today, or ask Claude to add it as a scheduled Cowork task so it runs automatically and drops results into your inbox. This analysis compounds the more data your account holds.
You now have a data-backed read on what makes your audience open your emails, five new subject lines ready to test, and a quarterly system that gets more accurate as your list grows.
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