FPVBuilder is a project in active development since 2025. Its thesis: most "online drone builders" you find on Google are static catalogs with unmaintained compatibility tables. We build deterministic rules in code, grounded in real technical documentation, open, documented and tested against real-world builds.
The FPV community (r/fpv, Discord, forums) is hostile to "AI-powered" apps because most are slop: ChatGPT spitting generic recommendations without understanding that a 1S whoop motor can't take a 6S battery. FPVBuilder is explicitly anti-slop: the rules are deterministic code grounded in real technical documentation (Oscar Liang, ExpressLRS docs, ArduPilot wiki) and verified build patterns — not an LLM guessing specs on the fly. They're publicly documented at /en/docs/rules and open to correction: if you spot an error, report it. The chatbot exists but only calls validated tools — never recommends made-up IDs.
The 50+ compatibility rules are documented publicly at /en/docs/rules. Each rule includes its technical rationale, covered cases and an example build that triggers warning/error. This is the moat: nobody clones 50+ rules + 5,700 verified products + cross-store matcher in an afternoon.
Affiliates. We earn commission when someone buys a part through an outbound link. You pay the same price as buying direct. Commission does NOT affect which store we recommend — the comparator always shows the lowest real in-stock price. If BetaFPV (10% commission) and AliExpress (5%) have the same product, we show the cheaper one first, not the higher-commission one.
Short: complete missing spec normalizers (BEC current, wire gauge), improve AliExpress matcher, open public API for stores wanting to integrate. Medium: mobile app, export to Betaflight CLI configs, sim integration (Liftoff, Velocidrone). Long: support agent that helps debug builds that don't fly.