Best Open-source Subscription Billing & Payments tools

Autumn

Plug‑and‑play billing layer for any pricing model

Meteroid

Cloud-native pricing and billing infrastructure for product-led SaaS

Flexprice

Usage-based metering and billing infrastructure for developers

Polar

Turn your software into a revenue stream effortlessly.

Hyperswitch

Composable open-source payments infrastructure built in Rust

OpenMeter

Real-time usage metering and billing for AI and DevOps

Kill Bill

Open-source subscription billing and payments platform for SaaS

Lotus

Flexible pricing engine for SaaS, usage‑based and custom plans

Formance

Modular developer platform for complex financial transaction flows

Laravel Soulbscription

Subscription and feature consumption management for Laravel applications

Lago

Open-source metering and usage-based billing API for SaaS

BillaBear

Self-hostable subscription billing system integrated with Stripe