Best Usage-Based Billing Software for Go

Schematic is a set of drop-in components that sit on top of Stripe for a complete purchasing experience. Launch, meter, and monitor features without ongoing code changes as your business grows. Instrument features and define policy for what your customers should have access to based on what they purchased. Add drop-in purchasing components beyond simple checkout such as upgrade/downgrade, customer portals, pricing tables, and usage meters. Define, enforce, and report usage-based metering in your product without changing a line of code. Connect to Stripe to keep your customers, products, and subscriptions in sync. Update plans, bundle & unbundle features, offer add-ons, support custom configuration, and handle exceptions. Manage exceptions with ease, grant seats, bump limits, and trial features. Complete account, billing, and usage context about each customer, all in one place. Schematic is committed to being reliable and lightning-fast.

​Flexprice is an open source, developer-first platform designed to simplify metering, pricing, and invoicing for SaaS and AI products. It enables teams to build usage-based, credit-based, or hybrid pricing models with full control. Flexprice's real-time usage metering allows you to define granular events, such as API calls, compute time, or custom actions, and track them reliably, even at scale. It supports prepaid and promotional credits, auto top-ups, and expiration rules, all configurable without extra logic. Its flexible pricing engine lets you define and iterate on seat-based, usage-based, or hybrid plans, override them per customer, and adapt pricing over time without additional engineering effort. With built-in feature management, you can define Boolean, metered, and config features per plan and customer, enforcing limits directly in your backend. Flexprice generates accurate invoices from real-time usage, subscriptions, or credits.