How AppSumo wrote email copy that earned $9,564 in 24 hours

Executive overview

Most promotional emails describe a product. This one sold an identity. AppSumo's campaign for Kernist, a font subscription service, targeted a hyper-specific audience — "font fanboys" — and wrote copy that made them feel seen.

The lesson: great sales copy ignores everyone except the buyer who's on the fence. It doesn't inform; it convinces.

Speak directly to the fence-sitter, not the crowd.

What made the Kernist email work

• Opened by naming the audience precisely — "font fanboys" — so non-buyers self-selected out immediately
• Used playful, over-the-top language to signal personality and build rapport
• Named a real problem designers have: recognising good design but not knowing why it works
• Framed the product as the solution to that specific frustration
• Created urgency with a countdown and scarcity ("the deal ends, no exceptions")
• Added a bonus (four months of back-catalogue fonts) as a final nudge for fence-sitters

The three buyer types framework

• Definite buyers — will purchase regardless of copy; don't optimise for them
• Non-buyers — will never buy; don't waste words on them
• Fence-sitters — the target; copy exists to move this group
• Good copy acts like a waiter recommending a dish: personal, confident, specific
• Humour was a bonus, not the goal — the goal was always to sell