Flux vs Rolling Your Own

TL;DR

Building your own auth, billing, feature flags, and observability gives you total control — and costs you months of engineering time that could go toward your actual product. Flux gives you 90% of that control with 1% of the effort.

The Real Cost of DIY

The last row is the killer. Even after you build each piece, you spend forever maintaining the glue code that connects auth to billing to flags to rate limiting.

When DIY Makes Sense

We’ll be honest: DIY is the right choice when:

• Your auth/billing/flags requirements are truly unique and can’t be abstracted
• You have a dedicated platform team with bandwidth to build and maintain
• Compliance requirements mandate you own every line of code
• You’re building a platform yourself (we’re not for platforms-as-a-service)

When Flux Makes Sense

Flux is the right choice when:

• You’d rather spend engineering time on your product, not your plumbing
• You need enterprise features (SSO, SCIM, audit logs) but don’t have 6 months to build them
• You’re tired of stitching together 5-10 tools and maintaining glue code
• You want everything to work together out of the box

The Integration Tax

The most underestimated cost of DIY isn’t building each piece — it’s making them work together. “Can this user on this plan use this feature at this rate?” requires your auth, billing, flags, and rate limiter to all agree. With separate tools, that’s your problem. With Flux, it’s one function call.