metering
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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.
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.
Anh-Tho Chuong
Anh-Tho Chuong is the co-founder and CEO of Lago, the open-source billing and invoicing platform trusted by companies like Mistral AI, Groq, PayPal, and Synthesia. Born in Réunion to a Vietnamese father who fled the war, she built her career through McKinsey consulting, a formative run as VP Growth (employee #1) at Qonto, and a pivot inside Y Combinator that turned a failed data-tools idea into one of Europe's fastest-growing developer infrastructure plays. Lago has raised $44M in total funding, amassed 9,000+ GitHub stars, and is reshaping how SaaS companies handle complex pricing without handing control to Stripe.