Why we built open source

When we started Flexprice, we didn’t want to create just another billing SaaS. We knew the problem wasn’t just about invoicing; it was about giving companies the flexibility to monetize however they want. Billing isn’t just finance—it’s core to growth, pricing strategy, and user experience.

That’s why we built Flexprice: an open, programmable, and developer-first approach to metering and billing.

Open Architecture

Traditional billing platforms claim to be the source of financial truth, but they’re walled gardens. They dictate how you integrate, how you structure pricing, and in some cases, even who you process payments with (Stripe Billing, anyone?). This lack of flexibility forces companies into brittle setups that don’t scale with their evolving needs.

Billing sits at the core of every B2B company, and no two companies have the same tech stack. Whether you use Stripe, Razorpay, Paddle, or an internal ledger, you should have the freedom to define how billing fits into your workflow—not the other way around.

That’s why Flexprice is open-source. You can integrate it with your existing tools, extend it as needed, and avoid vendor lock-in. We’re making monetization infrastructure as composable as modern software should be.

Developers First

Billing has always been an engineering nightmare. It’s high-stakes, high-complexity, and deeply intertwined with finance, yet most tools are built for accountants—not engineers.

Think about it: Every other critical system—authentication, analytics, payments—has developer-friendly options. Why not billing?

Flexprice is built API-first, designed for developers. Want usage-based billing? Dynamic metering? Hybrid pricing? You can configure it however you need. No more battling closed dashboards or hacking together billing logic with spreadsheets.

Plus, we’re fully transparent. Found a bug? Report it on GitHub. Need a new feature? Contribute or request it. Got feedback? Join our Slack. We’re building this in the open, with and for developers.

Fair Pricing

Most billing SaaS companies operate like rent-seeking middlemen—taking a percentage of your hard-earned revenue. The idea that a billing provider deserves a cut of your business just for processing invoices is ridiculous.

At our previous companies, we built in-house billing systems just to avoid these predatory fees. But maintaining them was a massive drain on engineering resources.

Flexprice is different. It’s open-source and forever free to self-host. For teams that don’t want to manage infrastructure, we’ll offer a cloud version at a fair price—without charging a percentage of revenue.

Composability

Pricing isn’t one-size-fits-all anymore. The era of flat subscriptions is long gone. Companies are shifting to hybrid models—subscriptions mixed with usage-based billing, credits, feature gating, and custom add-ons.

The problem? Existing billing tools force you into rigid structures that can’t accommodate these nuances.

With Flexprice, you can model pricing exactly how you want. Whether you’re metering GPU usage, API calls, seats, or custom business metrics, Flexprice makes it easy to define and iterate on pricing logic—without rebuilding everything from scratch.

Any company should be able to deploy a billing system like Snowflake, Algolia, or Segment 100x faster—without hiring a dedicated billing team.

Participative Approach

Billing is full of edge cases. Prorations, upgrades, downgrades, refunds, multi-region tax handling—the list goes on. These aren’t just theoretical problems; they’re the everyday nightmares engineers deal with.

Most closed-source SaaS companies won’t prioritize fixing these because they aren’t ‘big enough’ problems. But if you’re in the trenches, you know they pile up fast.

That’s why we’re creating a shared knowledge hub for billing and pricing. No more scouring Stack Overflow and Reddit for half-baked solutions. We’re bringing together the community to solve these challenges openly and collaboratively.

Built for Growth Teams, Not Just Finance Teams

Billing isn’t just a finance function—it’s a growth function. Pricing experimentation, feature packaging, and monetization strategy are crucial for scaling SaaS businesses.

Yet, most billing tools treat pricing as static. Flexprice makes it dynamic. Need to A/B test pricing? Offer usage-based trials? Dynamically bundle features? We make it possible without engineering bottlenecks.

Monetization shouldn’t be an afterthought—it should be a lever for growth. Flexprice is built to help SaaS and AI companies move fast, experiment boldly, and scale effortlessly.

Flexprice is more than just billing infrastructure—it’s a way to take control of your monetization strategy. If you’re tired of rigid, expensive billing systems, try Flexprice. Open-source, flexible, and built for modern SaaS growth.