ai-billing
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The Billing Engine Behind Your Netflix Habit Just Taught Itself to Think
For 24 years Aria Systems has quietly answered one boring, load-bearing question for the world's biggest companies: how do you charge millions of customers correctly, every month, without the whole thing falling over?
Lago
Lago is an open-source billing and metering platform that lets companies build usage-based, subscription, and hybrid pricing models without building a homegrown billing stack from scratch. Founded in 2021 by two early Qonto employees, it offers a free, self-hostable core plus managed cloud tiers, and is used by companies such as Mistral AI, PayPal, Groq and Synthesia to meter events and issue invoices at scale.
Tabs
Tabs is an AI-native revenue platform that automates the contract-to-cash cycle for B2B finance and accounting teams. Its AI agents read messy customer contracts, generate and send invoices, chase collections, reconcile payments, and handle revenue recognition - turning manual back-office work into software. Founded in 2023 in New York by operators from Latch, Tabs serves 200+ customers including Cursor and Statsig, and raised a $55M Series B led by Lightspeed in September 2025, bringing total funding past $91M.
Orb
Orb is a modern billing platform that helps software and AI companies turn raw product usage into revenue. Instead of being built around rigid subscriptions and contracts, Orb starts by ingesting real usage events and lets teams define any pricing logic on top - usage-based, seat-based, token-based, or hybrid. Founded by former Asana engineers who were tired of pricing changes taking months, Orb powers billing for companies like Vercel, Replit, Pinecone, and Perplexity.