Custom AI books, where the entire story and illustrations are custom

TAM TOP-DOWN

The global personalized storybooks for kids market was $1.42B in 2024 (Dataintelo). The broader children's publishing market at $10.2B narrows to a personalized-and-AI-custom slice by taking the personalized segment share directly, which the evidence already isolates at $1.42B. This is the honest ceiling: the entire addressable universe of buyers who already pay for a personalized children's book in any format, anywhere globally.

Personalized storybooks market (2024) = $1.42B TAM top-down

TAM BOTTOM-UP

Literacy enrollment aged 3-14 globally is 87% of roughly 1.1B children, yielding approximately 957M enrolled children. Parents aged 25-45 drive 72% of purchases. Assuming one AI custom book purchased per family per year as a gift, and 30% of families having more than one qualifying child, effective buyer units are approximately 957M times 0.3 (household penetration ceiling) = 287M potential orders. At $35 blended price (between digital $15 and print $45 midpoints), that yields a $10.1B gross ceiling, which is clearly the theoretical maximum.

957M children x 30% household rate x 20% willing-to-pay x $35/book = ~$2.0B TAM bottom-up

SAM FILTERS

North America and Europe represent 60% of the global children's publishing market (35% + 25%, per GlobalGrowthInsights). Lead countries: United States, United Kingdom, Germany. Within that 60%, apply 33% for digitally native, gift-motivated parents likely to discover and trust an AI book platform, reflecting early-adopter penetration consistent with Story Spark's 200,000 user base against total market size. Top-down SAM: $1.42B x 60% x 33% = $281M. Bottom-up SAM: $2.0B x 60% x 35% = $420M. Methods diverge by 1.5x, below the 2x threshold, but lowConfidence retained from TAM.

$1.42B x 60% geography x 33% digital-gift segment = $281M SAM top-down; $2.0B x 60% x 35% = $420M SAM bottom-up

SOM BUILD

Using conservative SAM of $280M. Year-one share of 0.5% reflects cold-start against Wonderbly, Story Spark, and Lullaby.ink, all already in market. Year-three share of 3% is achievable only with clear differentiation, such as multi-character or custom-world features. At $35 blended ASP (digital $15 to $25 plus print $30 to $60, weighted 60% digital), 240,000 cumulative book orders over three years generates $8.4M. Story Spark's 200,000 users as a comparable baseline supports this as a credible but not exceptional outcome.

$280M SAM x 3% year-3 share = $8.4M SOM; cross-check: 240,000 orders x $35 ASP = $8.4M