Building Authentication: Guides, Tutorials, Updates





Cookbook

Guides for Webflow, Bubble, Zapier, and more →



Documentation

Specific documentation on Cotter's API and SDKs →

TUTORIALS & GUIDES

Build a Custom Client Portal on Airtable Using Cotter Login

Build a scalable, secure, and flexible client portal on Airtable using Cotter, Sync Inc, and Next.js.

TUTORIALS & GUIDES

Add a Login Form to Your Notion Website in Under 10 Minutes! (with Cotter Integration and Custom Routes)

Use Notion to create a website and add a login form without any code.

FEATURE

No-Code Dashboard: Two Simple Steps to Add Login Form to Versoly Websites

All new Cotter No-Code Dashboard: Add magic link to your Versoly site in 2 simple steps!

TUTORIALS & GUIDES

No-Code Dashboard: Restrict your Webflow Site login to Allowed Emails in Google Sheets

Only allow certain emails to log in to your Webflow site.

TUTORIALS & GUIDES

Add a Login Form to Your Notion Website in Under 10 Minutes! (with Cotter Integration and Custom Routes)

Use Notion to create a website and add a login form without any code.

FEATURE

No-Code Dashboard: Two Simple Steps to Add Login Form to Versoly Websites

All new Cotter No-Code Dashboard: Add magic link to your Versoly site in 2 simple steps!

TUTORIALS & GUIDES

No-Code Dashboard: Restrict your Webflow Site login to Allowed Emails in Google Sheets

Only allow certain emails to log in to your Webflow site.

FEATURE

No-Code Dashboard: Add a Waitlist Form on your Landing Page built using Webflow

Send waitlist data (or any other user data) to Google Sheets.

FEATURE

No-Code Dashboard: Add private pages to your Webflow pages

Protect your page to logged in users only.

FEATURE

No-Code Dashboard: Two Simple Steps to Add Login Form to Webflow Websites

All new Cotter No-Code Dashboard: Add magic link to your Webflow site in 2 simple steps!

ZAPIER

Add "Name" and other fields to your Waitlist Google Sheet

Add additional fields to your waitlist sheet and grant access to your Webflow site waitlist on a rolling basis.

FEATURE

New: WebAuthn now works on iOS and Android!

Try WebAuthn on iOS and Android.

TUTORIALS & GUIDES

Cotter + Cloudflare Workers + Google Calendar API: Build a Calendly Clone using Google OAuth

Build a serverless Calendar Booking App using Cotter, Cloudflare Workers, and Google Calendar API.

FEATURE

Send User Data from Cotter to 2,000+ Web Apps using Zapier

Simplify customer engagement and database monitoring by connecting Cotter user data to over 2,000 web apps using @zapier!

ZAPIER

Automatically generate a lead for every new sign up and organize it in your favorite CRM tool!

In a matter of minutes and without a single line of code, you can automatically send info between Cotter and your CRM.

ZAPIER

Get Notified in Slack for Every New Sign Up to Your Website

Knowing who signs up to your site is just one Slack notification away - no need to check your user database regularly!



How to Prepare for your Y Combinator Interview

The Interview InviteTick tock, it’s the day the YC interview invitation is sent out. I remember anxiously waiting for my startup’s (Cotter) invite. I read from HN and

ZAPIER

Zapier Webhooks + Google Sheets + Cotter: Send Additional Fields Data to Your Google Sheets using Zapier

Know who logs in to your site and get the list of user emails, along with their names and other additional fields data imported to Google Sheets.

ZAPIER

Marketing Email works like Magic ✨ Re-engage Inactive Users to Visit Your Site!

Send a marketing email and redirect user to a designated page with seamless login.

ZAPIER

Zapier + Airtable + Cotter: Send User Data to Airtable using Zapier

Know who logs in to your site and get the list of user emails imported to Airtable.

FEATURE

New: Add Github and Google OAuth to Your Login Form

Allow users to log in to your site using their Github and Google accounts.

TUTORIALS & GUIDES

Add Google OAuth to your Login Form, No-Code!

Allow users to log in using their Google credentials without worrying about duplicate accounts.

ZAPIER

Zapier + Google Sheets + Cotter: Send User Data to Your Google Sheets using Zapier

Know who logs in to your site and get the list of user emails imported to Google Sheets.

WEBFLOW

Webflow Forms: Include Logged In User's Email on Form Submissions

Link form submission data to submitter's email on Webflow.

ZAPIER

Zapier Webhooks + Google Sheets + Cotter: Send Additional Fields Data to Your Google Sheets using Zapier

Know who logs in to your site and get the list of user emails, along with their names and other additional fields data imported to Google Sheets.

BUBBLE

Restrict Your Bubble Site Login to "Allowed" Emails Only using Google Sheets

Only allow certain emails to log in to your Bubble site! Use cases include RSVP, waitlists, student lists, and more.

BUBBLE

Build A No-Code Medium Publication Clone With Magic Link Using Bubble.io

Create your own no-code collaborative blogging platform with Cotter's magic link.

TUTORIALS & GUIDES

The Simplest Way to Authorize Github OAuth Apps with Next.js and Cotter

Add "Sign in with Github" in one click to authorize your Github OAuth App and access Github REST API using Cotter and Next.js.

WEBFLOW

RSVP-only event on Webflow

Add RSVP to your free events on Webflow to manage attendees!

BUBBLE

Here's How to Integrate Cotter's Magic Link to Your Bubble Site!

Build a Bubble site with password-less login using magic link.

TUTORIALS & GUIDES

How to Make an Interactive Todo List CLI using Python with an Easy Login Mechanism

Build your own Todo List CLI with Python using packages like Click, PyInquirer, and Cotter in minutes!

WEBFLOW

How to Restrict Your Webflow Website Login to "Allowed" Emails Only

Grant access to your Webflow website waitlist on a rolling basis!

WEBFLOW

How to Start a Members-Only Blog with Webflow

Want your blogs to be accessed by members only? Ask readers to sign in to read the full article!

FEATURE

How to Build a Seamless Yet Secure Passwordless Auth

"Secure" and "seamless" don't often go together as adding more security to your auth flow is usually done by adding more barrier.

TUTORIALS & GUIDES

OAuth 2.0 - Before You Start: Pick the Right Flow for Your Website, SPA, Mobile App, TV App, and CLI

OAuth 2.0 has at least 4 different flows for different use cases. Find out which flow you should use to secure your app.

FEATURE

Sendeck - A Free DocSend Alternative for Secure Document Sharing

Want to share documents securely and to authorized viewers only? Sharing, tracking, and managing your documents is now as easy as sharing a link.

TUTORIALS & GUIDES

What is WebAuthn: Logging in with Face ID and Touch ID on the web

Enable TouchID and Windows Hello authentication to your website. Introducing WebAuthn: how it works and how to implement it.

TUTORIALS & GUIDES

LocalStorage vs. Cookies: All You Need to Know About Storing JWT Tokens Securely in the Front-End

JWT Tokens are awesome but how do you store them securely in your front end? We'll go over the pros and cons of localStorage and Cookies.

TUTORIALS & GUIDES

What on Earth Is OAuth? A Super Simple Intro to OAuth 2.0, Access Tokens, and How to Implement It in Your Site

Get a quick intro on what OAuth 2.0 is and how signing in with OAuth 2.0 works – explained in simple terms using Google Sign In as an example.

WEBFLOW

Here's How to Integrate Cotter's Magic Link to Your Webflow Site in Less Than 7 minutes!

In this tutorial, we'll build a webflow site with password-less login using magic link.

FEATURE

Medium and Slack moved away from passwords and here's a reason why you should too!

Turns Out Your Complex Passwords Aren't That Much Safer — Go Passwordless!

TUTORIALS & GUIDES

Stop spending days to code your login page! Add Cotter's magic link to your Gatsby app under 5 minutes

Supercharge your Gatsby app's authentication system with Cotter's magic link. Like how Slack does it, but simpler.

TUTORIALS & GUIDES

Flutter Email & Phone Auth: 3 Simple Steps To Log Your Users In via Email, SMS, and WhatsApp using Cotter

In this tutorial, we'll build a flutter app that allows users to sign up and sign in with their email or phone number instead of using passwords.

TUTORIALS & GUIDES

Fast Passwordless Auth in Flutter: Add a One-line Sign Up and Login with Device using Cotter

In this tutorial, we'll create a Flutter app from scratch that allows users to sign in with their device.

TUTORIALS & GUIDES

Passwordless Login with Email and JSON Web Token (JWT) Authentication using Next.js

How do you log your users in and how do you give them access? We'll go over how to authenticate and authorize users without passwords in Next.js.

TUTORIALS & GUIDES

Angular: Send Email, SMS, and WhatsApp Verification Code to New Users Worldwide

In this tutorial, we'll create a new Angular website and add a simple email and phone number verification. To verify the user's phone number, we'll give the options to send the code via SMS or WhatsApp.

TUTORIALS & GUIDES

Say Goodbye To Passwords: The Easy Way to Add Sign In With Device to Your React Native App in 5 Minutes

We'll go over how to build a React Native app and allow users to "Sign in with device".



Passwords Will Be a Thing of the Past and Here's Why

In the last few months, we wanted to build a passwordless authentication into our app by implementing public-private key cryptography based on the FIDO and WebAuthn protocols. After our experimentation,



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In this blog, we will be talking about our product, feature updates, and development tutorials! As we grow, we'll also share some experience about building a startup, the tools that



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