Open-source Lemon Squeezy alternatives

Polar is an open-source billing platform aimed at AI startups and other software businesses that need to charge for tokens, agents and compute without building billing infrastructure themselves. It positions itself as the financial layer for intelligent software and acts as the merchant of record.

It supports many pricing models, including usage billing, subscriptions, seats, credits, trials and discounts, which can be combined. Metering can track tokens, API calls, agent runs, GPU seconds and storage at the level of individual events. Checkouts, real-time metrics and worldwide tax handling are included, and as merchant of record Polar takes on receipts, customer accounts, dunning, sales tax and VAT.

Polar is built with Python and FastAPI on the backend and Next.js, React and TypeScript on the frontend, in a Turborepo monorepo, and is licensed under Apache-2.0. An API and SDKs let you integrate it into docs, sites and services. Pricing is per transaction, and an application-based Startup Program is available for eligible startups.

Easy Digital Downloads (EDD) is a WordPress plugin for selling digital downloads. Its authors argue that the large WordPress e-commerce plugins have never handled digital goods well, so EDD concentrates on the features sellers actually need rather than every possible option, and aims to make selling downloads easy and complete.

Installed into an existing WordPress site, it adds a store for digital products with payment support, with Stripe among the topics listed by the repository. The codebase has build scripts that prepare installable packages, translations can be contributed in other languages, and the repository serves as a developer portal while customer support is handled through the vendor's support page.

EDD is written in PHP and released under the GPL-2.0 license. Because it runs inside WordPress, you host it with your own WordPress hosting. Documentation, extensions and support are provided on easydigitaldownloads.com, and contributors can raise issues or send pull requests on GitHub.