Keeper.sh 는 간단하고 오픈소스 캘린더 동기화 도구입니다. Google 캘린더, Outlook, iCloud, Fastmail, CalDAV 서버 또는 원격으로 호스팅되는 iCal 및 ICS 링크에서 이벤트를 끌어와, 하나의 또는 여러 개의 캘린더로 푸시하여 시간 슬롯이 모두 일치할 수 있도록 할 수 있습니다. Google, Outlook, iCloud, Fastmail, CalDAV는 각각 소스나 목적지로 사용할 수 있는 일류 통합 기능이며, iCal과 ICS 링크는 풀 전용 기능입니다. 또한 글로벌 MCP 서버이자 API 역할을 하여 귀하나 에이전트가 하나의 편리한 인터페이스에서 모든 캘린더를 관리할 수 있습니다.

추천 실행 방법은 keeper.sh 호스팅 버전으로, 서버, 도메인, 업그레이드, 백업, 그리고 사용자가 직접 등록할 구글과 마이크로소프트 로그인 앱을 제외한 동일한 코드입니다. 셀프 호스팅은 일류 경로이며, 셀프 호스팅 시 모든 프로 기능이 포함되어 있습니다 — 이는 체험판이 아니고 사라지지 않을 것입니다. 5달러 대신 유지비가 들 것입니다.

특징

• 일류 구글 캘린더, 아웃룩, 아이클라우드, 패스트메일, CalDAV 통합 기능, 각각 소스 또는 목적지로 사용 가능
• 원격 호스팅 iCal 및 ICS 링크의 풀 전용 인데스

About

Keeper.sh is a simple & open-source calendar syncing tool. It allows you to pull events from your Google Calendar, Outlook, iCloud, Fastmail, CalDAV server, or remotely hosted iCal and ICS links, and push them to one or many calendars so the time slots can align across them all. Google, Outlook, iCloud, Fastmail, and CalDAV are first-class integrations that can each be used as a source or as a destination, while iCal and ICS links are pull-only. It also serves as a global MCP server and API for you or your agents to manage all your calendars from one convenient interface.

The recommended way to run it is the hosted version at keeper.sh: the same code, minus the server, the domain, the upgrades, the backups and the Google and Microsoft sign-in apps you would otherwise register yourself. Self-hosting is a first-class path and every Pro feature is included when you self-host — that is not a trial, and it is not going away. It costs you the upkeep instead of the $5.

Features

• First-class Google Calendar, Outlook, iCloud, Fastmail, and CalDAV integrations, each usable as a source or a destination
• Pull-only ingestion of remotely hosted iCal and ICS links
• Incremental syncing on Google and Outlook using provider sync tokens rather than refetching everything
• Event content agnostic syncing engine
• Push aggregate events to one or more calendars
• Per-source privacy controls to strip event names, descriptions, and locations, replacing the title with a {{calendar_name}} or {{event_name}} template
• REST API under /api/v1 authenticated with API tokens
• MCP (Model Context Protocol) server for AI agent calendar access
• Combined iCal feed you can subscribe to from any calendar app
• Open source under AGPL-3.0
• Easy to self-host
• Easy-to-purge remote events

Bug Reports & Feature Requests

If you encounter a bug or have an idea for a feature, you may open an issue on GitHub and it will be triaged and addressed as soon as possible.

Contributing

High-value and high-quality contributions are appreciated. Before working on large features you intend to see merged, please open an issue first to discuss beforehand.

Local Development

The dev environment runs behind HTTPS at https://keeper.localhost using a Caddy reverse proxy with automatic TLS. The .localhost TLD resolves to 127.0.0.1 automatically per RFC 6761 — no /etc/hosts entry is needed.

Prerequisites

• Bun (v1.3.11+)
• Docker & Docker Compose

Getting Started

bun install

Generate and Trust a Root CA

The dev environment runs behind HTTPS via Caddy. You need to generate a local root certificate authority and trust it so your browser accepts the certificate.