The State of Homegrown Authentication Report: 2025 highlights the growing trend of developers building and maintaining their own authentication solutions, driven by a desire for greater control, security, or flexibility. The report finds that at least 50% of self-hosted authentication teams prefer downloadable software over cloud-only solutions, reflecting concerns about data residency and security risks associated with multi-tenant SaaS models. The industry has grown quickly between 2015 and 2020, but most reports ignore the DIY authentication teams, leaving them without insights into how others are tackling the same challenges. The report paints a clear picture of these teams, including their tech stacks, people dedicated to the task, and experiences with passkeys and security breaches. It underscores the need for solutions that offer both flexibility and security, and suggests that self-hosted authentication remains a popular choice due to its control it provides.