Pay

Judgement

What it is

Integration

What it does

A Rails engine for payments and subscriptions across Stripe, Paddle, Braintree and Lemon Squeezy, with webhooks and receipts.

Adopt it when

You are building a Rails SaaS and want one billing API that can switch payment providers.

Watch out

Provider-specific features still leak through the shared API.

Ready for

Production-ready

Runs as

Library

Built with

Ruby and Rails

How established

Established: started 9 years ago, latest release v12.3.0.

What the license allows

You can build it into a product you sell, as long as you keep its copyright notice.

Judged on 2026-11-03 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: Pay → Ruby → GCC → LLVM project → runs on a microchip

How compilers were built, back to punched paper tape

Open-source alternatives to Pay

1. 1
   Cashier-stripe laravel

   Laravel Cashier provides an expressive, fluent interface to Stripe's subscription billing services.

   Integration Production-ready You are building a Laravel SaaS and charging through Stripe.

   ★ 2.5k MIT PHP Active, pushed 13 days ago
2. 2
   Dj-stripe dj-stripe

   dj-stripe automatically syncs your Stripe Data to your local database as pre-implemented Django Models allowing you to use the Django ORM, in your code, to work with the data making it easier and faster.

   Integration Production-ready You run a Django app on Stripe and want to query billing data with the ORM.

   ★ 1.8k MIT Python Active, pushed today
3. 3
   PayKit getpaykit

   Build Stripe billing without the glue code. Products in code, webhooks handled, billing state in your app.

   Integration Experimental You are building a TypeScript SaaS on Stripe and want less hand-written billing glue.

   ★ 1.1k MIT TypeScript Active, pushed 36 days ago
4. 4
   BillingSDK dodopayments

   Modern Billing & Monetization UI Components Library

   Building block Usable You are building billing pages in React and Tailwind and want ready components.

   ★ 511 GPL-3.0 TypeScript Active, pushed 8 days ago
5. 5
   Cashier Paddle laravel

   Cashier Paddle provides an expressive, fluent interface to Paddle's subscription billing services.

   Integration Production-ready Your Laravel app sells through Paddle as merchant of record.

   ★ 269 MIT PHP Active, pushed 19 days ago
6. 6
   Usage_credits rameerez

   💳✨ Add usage-based credits to your Rails app

   Building block Usable Your Rails app charges per use, for example per AI generation, and you want credits rather than metered invoices.

   ★ 168 MIT Ruby Active, pushed 8 days ago
7. 7
   Laravel Subscriptions laravelcm

   Laravel Subscriptions is a flexible plans and subscription management system for Laravel.

   Building block Usable You need plan and feature-limit logic in Laravel and handle payments separately.

   ★ 245 MIT PHP Slowing, pushed 7 months ago

Commercial subscription billing libraries

1. 1
   RevenueCat RevenueCat

   The world’s best apps use RevenueCat to power in-app purchases, manage customer data, and grow revenue across iOS, Android, and the web.

   Building block Production-ready A mobile app sells subscriptions and you do not want to build receipt validation and entitlement logic yourself.

   Commercial