Letterfork

Letterfork converts a single newsletter into seven platform-specific posts for LinkedIn, X, Bluesky, Substack Notes, Threads, Instagram, and Reddit while maintaining the creator's original voice. Built by an independent developer known as Super, who created it to solve their own problem of spending excessive time reformatting newsletters, it trains on 5 to 10 past newsletters to extract a writer's style, and supports Substack, Beehiiv, and Ghost newsletter platforms as sources. Letterfork applies platform-specific formatting, such as LinkedIn hooks, X thread pacing, and Instagram caption length, and produces editable plain-text output with manual control before posting, with no auto-publishing so users retain full control over what goes live. The MVP recently launched, with the founder actively seeking user feedback through email and social media channels. Pricing is freemium: the product offers 3 free rewrites with no credit card required, with paid tiers available on its pricing page.