How Hardware Startups Use FreeRTOS to Avoid Buying an OS

In episode 37 of Hardware Startups with Fexingo, Lucas and Luna dive into a surprising cost trap that kills young hardware companies: paying for a real-time operating system before you need one. Lucas walks through the case of a smart-lock startup that saved $240,000 in licensing fees by switching to FreeRTOS — an open-source kernel that handles task scheduling, memory management, and interrupt handling for free. They discuss the real tradeoffs: FreeRTOS gives you a minimal scheduler but no device drivers, no file system, and no security stack out of the box. Luna pushes back on whether the savings justify the engineering time needed to build those missing pieces. Lucas cites a 2025 survey from Embedded.com showing that 68 percent of hardware startups using FreeRTOS eventually migrate to a commercial RTOS at Series A. The episode also covers the hidden cost of debugging without a vendor support line, and the one rule Lucas has for founders: never sign a term license until you've proven you need a full POSIX-compliant OS. A practical, numbers-driven episode for any founder staring at a BOM and wondering where the money went. #FreeRTOS #RealTimeOperatingSystem #HardwareStartups #EmbeddedSystems #SmartLock #OpenSource #FirmwareCosts #RTOS #POSIX #SeriesA #Bootstrapping #ProductDevelopment #LicensingFees #Business #Technology #FexingoBusiness #BusinessPodcast #Hardware Keep every episode free: buymeacoffee.com/fexingo