Indie and small-studio app developers—roughly 1.2 million subscription-capable publishers—regularly struggle to convert free or trial users into recurring customers and to iterate paywalls effectively; many report conversion rates below 5% and lack the analytics and experimentation tooling that larger teams use. The result is missed recurring revenue and an overreliance on advertising income that is weakening under ATT and cookie deprecation. You could build a focused developer tool combining a lightweight SDK, privacy-first event pipeline, no-code paywall and experiment builder, plus prebuilt billing integrations (Stripe, App Store, Play) and cohort LTV analytics driven by a Bayesian A/B engine. Positioning the product as a turnkey offering with a target ACV around $3,000 (or a freemium/revenue-share entry path) keeps acquisition friction low while promising measurable LTV uplift. This market looks attractive now because the subscription economy continues to expand and privacy-driven ad decline increases urgency for first-party monetization; using 1.2M publishers at a $3,000 ACV implies a serviceable market of about $3.6B. Lower costs for indie development, creator-funded micro-SaaS growth, and platform privacy changes (ATT, cookieless) create a clear timing window for a solution that converts users to subscriptions. To stand out, focus on developer UX, fast time-to-value through paywall templates and ROI dashboards that show projected revenue lift within 30 days, and strong privacy compliance as a core feature rather than an afterthought. Real challenges include the complexity of platform billing integrations, the cost of acquiring and supporting long-tail indie customers, and competing with mid-market experimentation/analytics vendors, but the narrow, revenue-first value proposition makes a defensible niche if execution is disciplined.