David Park was not a first-time founder when he started Jenni AI. He had been building things since his teens, including a clothing brand and a dating app that went nowhere. The writing tool that became Jenni began as an internal asset inside his marketing agency, then turned into SaaS for agencies, before it found its real audience. For roughly three years the product barely moved, holding around $2,000 in monthly recurring revenue while Park and his co-founder kept rebuilding it on top of GPT-2 and then GPT-3.

The turn came in 2022 when they stopped trying to serve everyone and pointed the product squarely at students, researchers, and academics who needed help drafting papers and handling citations. Early traction was unglamorous: cold emails to land the first handful of paying users, then niche student and academic Facebook groups, then trending conversations on Twitter. A viral Twitter thread about the tool is what broke it open, pushing MRR from about $2,000 to $10,000 in a single month.

Short-form video did the heavy lifting after that. The team leaned hard into TikTok, Reels, and YouTube Shorts with study-hack style content that fit naturally into student feeds, running multiple regional accounts to reach different algorithmic pockets and posting constantly. They paired this with small and mid-size influencers on retainers and a student ambassador affiliate program, then layered SEO content underneath for durable search traffic. By his own account it took 46 months to go from zero to $1M ARR with Jenni, the slow part being those early flat years rather than the climb after the pivot.

The later stretch was not a clean ramp either. Park has been candid that he was stuck in the $8M to $9M ARR range for more than a year before finally crossing $10M, a milestone he called the hardest one to hit. He also kept building through a thyroid cancer diagnosis during the fastest growth period. The company stayed bootstrapped throughout, later expanding into a multi-product setup, including a tool it acquired and another built from scratch, each crossing $1M ARR.

By late 2025 Park reported Jenni AI at $10M ARR with around 10 million users, and set the next target at $15M. The throughline of his public posts is patience under a flat line: the product spent years going almost nowhere before the right audience and the right distribution channel turned it into one of the larger bootstrapped AI writing businesses.