Hexclave

Hexclave is a self-hostable, open-source platform that bundles the core infrastructure most products need to manage users: authentication, payments, email, and analytics. Instead of stitching together four separate services, you get a single cohesive system where each piece is modular enough to use independently or together.

It's built for product teams that want ownership over their user data without managing a sprawl of third-party vendors. Because it's open source and backed by Y Combinator, it sits in a space between fully managed SaaS tools and roll-your-own solutions.

The core building blocks cover:

• Auth – user sign-up, login, and session management built in, so you're not wiring up a separate identity provider
• Payments – billing and subscription logic as part of the same platform rather than a disconnected integration
• Emails – transactional and product emails handled natively, keeping user communication tied to user data
• Analytics – signals and usage tracking without shipping data off to a third-party analytics service

The "hexclave" name references hexagonal grid packing, the tightest possible arrangement of any shape. That geometry is the design philosophy: modules that fit together without wasted space or overlap.

For teams building SaaS products or any user-facing application, Hexclave reduces the number of vendors you depend on while keeping the flexibility to swap or extend individual pieces. Self-hosting means your user data stays on your infrastructure.