Inth

Developer-first privacy infrastructure automating cookie consent, compliance, and DSARs for modern web teams backed by YC.

London, GB

Founded

2025

Competitive Advantages

c15t delivers sub-100ms consent overhead by bundling consent logic directly into the application rather than injecting blocking scripts that degrade Core Web Vitals. This developer-first approach contrasts with legacy CMPs like OneTrust and Cookiebot that rely on external script injection.

The open-source Apache 2.0 license reduces vendor lock-in and makes c15t easier to adopt in commercial environments. Built-in i18n support, geo-location detection, and compliance coverage across GDPR, CCPA, LGPD, IAB TCF 2.3, and 15+ privacy-law jurisdictions provide out-of-the-box global readiness.

Source: inth.com

Memo

Christopher Burns is a second-time founder who previously co-founded Everfund, a modern donation platform for UK charities. After winding down Everfund, he spent time in San Francisco before returning to the UK to build Consent.io (now Inth) and author the open-source c15t consent framework.

Inth is backed by Y Combinator and headquartered in London. The company operates at the intersection of developer tooling and regulatory compliance, with a focus on delivering infrastructure that is genuinely good rather than merely checkbox-compliant.

Source: heavybit.com

Product Overview

c15t is a headless, composable consent engine built for modern web apps that runs entirely in your frontend or edge stack with no external scripts. It provides native SDKs for React, Next.js, Vue, and Svelte, with policy packs for region-specific behavior and a rebuilt backend v2 that is ~60% smaller than the previous bundle.

c15t has surpassed 2 million npm downloads and is used by developer tools companies, luxury hotel chains, and online supermarkets. The framework is licensed under Apache 2.0 and offers three deployment modes: cloud-connected, complete offline, and custom backend integration.

Source: ycombinator.com