Best Open-source Subscription Billing & Payments tools

Polar

Turn your software into a revenue stream effortlessly.

Flexprice

Usage-based metering and billing infrastructure for developers

OpenMeter

Real-time usage metering and billing for AI and DevOps

Hyperswitch

Composable open-source payments infrastructure built in Rust

Meteroid

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

Lago

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

Autumn

Plug‑and‑play billing layer for any pricing model

Lotus

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

Formance

Modular developer platform for complex financial transaction flows

Kill Bill

Open-source subscription billing and payments platform for SaaS

BillaBear

Self-hostable subscription billing system integrated with Stripe

Laravel Soulbscription

Subscription and feature consumption management for Laravel applications