x1xhlol/zero-calendar

x1xhlol/zero-calendar has 366 GitHub stars and 93 forks. GitHot measured +1 stars in 24 hours. Last checked 2026-11-11 23:42 UTC. Last push 2026-04-26.

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Zero Calendar is an open-source AI-native calendar that manages your schedule intelligently, giving you more time for what matters.

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What you can do

Natural-language scheduling and calendar actions
Google Calendar sync and webhook-based updates
Invite flows with email delivery through Resend
Calendar analytics, conflict detection, and free-time discovery

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README.md

Original

Zero Calendar

AI-powered scheduling with natural language event creation, Google Calendar sync, invite emails, and analytics built on Next.js, Convex, and Better Auth.

Features

Natural-language scheduling and calendar actions
Google Calendar sync and webhook-based updates
Invite flows with email delivery through Resend
Calendar analytics, conflict detection, and free-time discovery
Better Auth + Convex-backed authentication and user data
Modern Next.js App Router UI

Stack

Next.js 16
React 19
Bun
Convex
Better Auth
OpenRouter AI SDK
Resend

Quick start

1. Install dependencies

bun install

2. Create your environment file

Create .env.local and set the values your deployment needs:

BETTER_AUTH_SECRET=
SITE_URL=http://localhost:3000
NEXT_PUBLIC_SITE_URL=http://localhost:3000

NEXT_PUBLIC_CONVEX_URL=
CONVEX_URL=
CONVEX_SITE_URL=
NEXT_PUBLIC_CONVEX_SITE_URL=

GOOGLE_CLIENT_ID=
GOOGLE_CLIENT_SECRET=

OPENROUTER_API_KEY=
OPENROUTER_MODEL=x-ai/grok-4.1-fast

RESEND_API_KEY=
RESEND_FROM_EMAIL="Zero Calendar <[email protected]>"

3. Start Convex

If you need to regenerate Convex types or run the backend locally:

bunx convex dev

4. Start the app

bun dev

Open http://localhost:3000.

Environment variables

Variable	Required	Purpose
`BETTER_AUTH_SECRET`	Yes	Shared secret used by Better Auth and server-side Convex access control. Set the same strong random value in both your Next.js and Convex environments.
`SITE_URL`	Yes	Canonical server-side site URL used by auth flows.
`NEXT_PUBLIC_SITE_URL`	Yes	Public site URL used by the client and invitation links.
`NEXT_PUBLIC_CONVEX_URL`	Yes	Public Convex deployment URL for the frontend client.
`CONVEX_URL`	Usually	Server-side Convex URL. If omitted, server code falls back to `NEXT_PUBLIC_CONVEX_URL`.
`CONVEX_SITE_URL`	Yes	Convex site URL used by Better Auth server integration.
`NEXT_PUBLIC_CONVEX_SITE_URL`	Optional	Public override for `CONVEX_SITE_URL` when you need separate client/server values.
`GOOGLE_CLIENT_ID`	Yes	Google OAuth client ID for sign-in and calendar access.
`GOOGLE_CLIENT_SECRET`	Yes	Google OAuth client secret.
`OPENROUTER_API_KEY`	Yes	API key for AI-powered scheduling features.
`OPENROUTER_MODEL`	Optional	Override the default OpenRouter model.
`RESEND_API_KEY`	Yes	API key used to send invitation emails.
`RESEND_FROM_EMAIL`	Optional	Sender identity for invitation emails.

Deploying to Vercel

The deploy button above clones this repository into a new Vercel project. Before the app is usable, make sure you also:

Create or connect a Convex deployment.
Add the environment variables listed above in Vercel.
Configure Google OAuth for your deployed domain and Better Auth routes.
Set a real BETTER_AUTH_SECRET for production.
Configure Resend if you want invitation emails enabled.

License

MIT