UniBee

Runs subscription plans, usage metering, coupons and invoices across several payment gateways for SaaS firms.

unibee.dev · Free plan

Visit unibee.dev ↗would rather buy than build

Details

What it does: Invoicing and billing, Payments and checkout
Who it’s for: Software companies
Pricing: Free plan
Works on: Web, API
Extras: Open source, Can self-host
Tags: subscription billing, usage metering, recurring payments, entitlements

Kill Bill
Open source platform for running subscription and usage billing plus payment routing on your own servers.
Invoicing and billing · Software companies
Kelviq
Acts as merchant of record for software companies, handling subscriptions, usage billing, feature limits and global sales tax.
Since 2026
Pay as you go · Invoicing and billing · Software companies
Coinhop
Phone app that collects recurring client payments on a weekly or monthly schedule and sends reminder invoices, for teachers and freelancers.
Pay as you go · Invoicing and billing · Freelancers
Autumn
Adds usage limits, credits, plans and spend controls on top of Stripe so AI startups can change pricing without rebuilding billing.
Free plan · Payments and checkout · Developers