User authentication, solved.

Add sign up, sign in, and user management to your app in minutes. One API, any language.

Integrate in minutes

Create a registration flow for your users with a single API call. AuthKit handles the UI, validation, and storage.

curl -X POST https://api.authkit.tech/provide/register \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json"

# Response:
# {
#   "redirect_url": "https://authkit.tech/serve/register?id=tmp_abc123"
# }
#
# Redirect your user to the URL above.
# After sign-up, they return to your redirect URL.

How it works

Step 1

Create your organization

Step 2

Get your API key

Generate an API key for your organization. Use it to authenticate requests from your backend to the AuthKit API.

Step 3

Redirect users to sign up

Call a single endpoint to get a registration URL. Redirect your users there — AuthKit handles the rest.

Everything you need

Multi-org support

Each of your apps gets its own organization with independent users, API keys, and settings.

OAuth built in

Google sign-in works out of the box. No extra configuration needed for your users.

Email verification

Automatic email confirmation flows keep spam out and ensure real users sign up.

Open source

Fully open source and self-hostable. Inspect the code, contribute, or run it on your own infrastructure.