content · Shipped — running in production

Email newsletter engine

Weekly newsletter drafted from your week's content + community signals. You approve + send.

What it does

Each Friday, pulls your week's published content (blog posts, social posts, podcast appearances, newsletter mentions of you) + community signals (top-voted Reddit threads in your niche, top discussions on HackerNews, top comments on competitor LinkedIn posts) and drafts a newsletter in your voice. Subject line A/B variants. Plain-text + HTML versions. Drops in your ESP (Substack, Beehiiv, ConvertKit, Mailchimp, Resend) as a draft for you to approve and send.

Inputs

Brand voice document. ESP credentials. Content sources to pull from.

Outputs

Weekly newsletter draft in your ESP. Subject line variants. Suggested send time.

Cost per run

~$8 per newsletter drafted.

Models used

Claude Opus for the body. GPT-4o for subject lines (subject line A/B testing benefits from model diversity).

Best for

Founders who want to publish a newsletter but can't find time. B2B brands with weekly cadence ambitions.

Not for

Brands without enough weekly content to fill a newsletter — use a biweekly or monthly variant instead.

Common questions

Will it write in my voice if I'm not a frequent writer?

If you have at least 5K words of existing public writing, yes. Less than that, the voice will lean toward 'B2B-blog-default' until you write more.