Open Source OneTrust Alternatives
A curated collection of the 2 best open source alternatives to OneTrust.
The best open source alternative to OneTrust is c15t. If that doesn't suit you, we've compiled a ranked list of other open source OneTrust alternatives to help you find a suitable replacement. Other interesting open source alternative to OneTrust is OpenPolicy.
OneTrust alternatives are mainly Compliance & Risk Management. Browse these if you want a narrower list of alternatives or looking for a specific functionality of OneTrust.
c15t is a developer-first consent management platform for JavaScript, React, and Next.js teams who want cookie banners inside their own stack.
Cookie banners usually arrive as a third-party snippet you cannot inspect, style, or version alongside the rest of your application. c15t moves consent management back into the codebase, giving JavaScript, React, and Next.js teams prebuilt banners, consent dialogs, and preference centers, plus headless APIs when the design calls for something custom.
The project ships as a set of npm packages: a framework-agnostic core, React and Next.js bindings with server component and SSR support, translations, a CLI for configuration and database migrations, and a self-hostable backend that stores durable consent records, policy state, and audit logs. A separate scripts package holds consent-aware loaders for dozens of analytics and marketing tools.
Several pieces cover the parts of consent that teams usually hand-roll.
- Consent gating: analytics, ads, pixels, tag managers, and chat widgets run only once matching consent exists.
- Google Consent Mode v2: Tag Manager and gtag.js get denied defaults at page start and updates when a user chooses.
- Prebuilt or headless: use the shipped UI components, React hooks, or framework-native primitives.
- IAB TCF 2.3: an addon generates TC strings and exposes vendor and purpose controls for programmatic advertising.
- Deployment modes: a hosted backend, a self-hosted backend, or offline mode storing consent in the browser.
Offline mode suits local development, previews, and static sites, while the self-hosted backend needs your own database and infrastructure. Teams already on Next.js will find the App Router and Pages Router integrations the shortest path in.
Typed configuration that generates privacy and cookie policies and drives the consent gating the cookies they describe, rendered inside your app.
PolicyStack collapses a privacy policy, a cookie policy and the consent that gates those cookies into a single typed config. What renders is components inside your React, Vue, Svelte, Solid or Angular app, never a third party iframe dropped on the page.
The pieces are separable, so you take what you need. A Vite plugin compiles the config at build time and scans the project for third parties you never declared, while the consent core is a headless state machine under 4kb. No banner interface ships with it, which means the banner is built from your own components and matches the rest of the app.
The building blocks divide along clear lines.
- Policy: your privacy and cookie policy as a typed config, rendered as components or Markdown.
- Consent: a headless consent state machine with adapters for five frameworks and no bundled UI.
- Build checks: the Vite plugin fails the build when a cookie is set without a consent gate.
- Script loaders: a package of consent gated loaders for third party scripts.
- CLI: an init command installs the right packages for your stack and writes a starter config.
- Cloud: an optional hosted control plane for versioning, audit trails and consent analytics.
Everything except Cloud is Apache 2.0 and every package versions together under one scope. The project is direct about its limits, since it generates documents rather than legal advice, and expects a lawyer to read the result before publication.
