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imetn/calends · source

Snapshot 2 · 2026-11-06T10:56:25Z · TypeScript · MIT

GitHub description at capture

The settlement day for everything you subscribe to — a self-hosted, AI-native subscription ledger with multi-currency, shared plans, reminders and a built-in MCP server.

README at capture

<p align="center">
  <img src="app/public/icons/logo.svg" width="96" height="96" alt="Calends logo" />
</p>

<h1 align="center">Calends</h1>

<p align="center">
  Track subscription charges, shared payments and prepaid balances on your own server.
</p>

<p align="center">
  <a href="https://calends.date">Website</a> ·
  <a href="https://demo.calends.date">Live demo</a> ·
  <a href="#quick-start">Quick start</a> ·
  <a href="#ai--mcp">AI &amp; MCP</a> ·
  <a href="README.zh-CN.md">简体中文</a>
</p>

<p align="center">
  <img src="docs/screenshots/overview.png" alt="Calends overview" width="49%" />
  <img src="docs/screenshots/timeline.png" alt="Calends subscription timeline with billing periods, plan changes and payment methods" width="49%" />
</p>
<p align="center"><sub>Overview and subscription timeline · Fictional demo data</sub></p>

---

## Billing and payment history

Track what you pay, when it renews, and who owes you. Calends brings subscriptions, shared plans and prepaid balances into one private, single-owner ledger, with an optional read-only public page and AI access through MCP.

- **Flexible billing** — monthly, yearly, custom cycles and lifetime purchases, with trials, intro prices, bonus periods, pauses, postpaid billing, advance charging and cancellation deadlines.
- **Usage meters** — track per-period usage or cumulative readings in any unit, with shared meters across subscriptions, usage metrics, aligned charts and usage in charge records.
- **Billing history** — keep price, plan and region changes, gaps and overlapping subscriptions. See total spent, actual monthly cost and every charge.
- **Transfers and split payments** — count second-hand takeovers and resales in net cost, and split a charge across multiple payment methods.
- **Multiple currencies** — historical exchange rates for past charges, current rates for forecasts, and your choice of display currency.
- **Balances and shared plans** — track prepaid credit and gift cards, estimate when balances run out, and manage payments for friends. Shared plans have dated collection rules, member overrides, per-period receipts with skipped-period collection, prepayments and waivers, overdue tracking and exit refunds; the member sheet uses a monthly period grid with receipt details on click, prepayments and waivers, while people have private avatars, custom colors and a separate account for each plan.
- **Reports and calendar** — spending trends, a daily heatmap with optional 3D bars, cash vs. accrual, prepaid value, cancellation savings, subscription checkups and a shareable year in review. Includes month/year calendars and a private ICS feed.
- **Search** — find Chinese names by full pinyin, initials or mixed syllables in the subscription list, command palette and pickers.
- **Renewal reminders** — email, Telegram, Lark/Feishu, DingTalk, WeCom, Slack, Discord, Bark, ntfy, ServerChan and custom webhooks.
- **AI access** — query and update your ledger from an MCP-compatible assistant, with scoped tokens and previews for write operations.
- **Import external ledgers** — preview and import CSV files, ZIP backups and databases from Wallos and other services in your browser.
- **Public page editor** — arrange widgets on a grid canvas and customize the header of your read-only public page.
- **Storage and access** — password and passkey sign-in, remote device sign-out, optional public sharing with server-side masking, JSON backup/restore and CSV import/export. Available in 14 languages.

## Quick start

Want a look first? [Try the live demo](https://demo.calends.date).

### Cloudflare

[Deploy to Cloudflare](https://deploy.workers.cloudflare.com/?url=https://github.com/imetn/calends), add a long random `SETUP_TOKEN` secret to the Worker, then open its URL, enter the token and set your password. To deploy from source, see the [Cloudflare guide](docs/self-hosting.md#cloudflare-from-source).

### Docker

```bash
curl -fsSL https://raw.githubusercontent.com/imetn/calends/main/docker/compose.prebuilt.yml -o compose.yml
docker compose up -d
docker compose logs calends
```

Open `http://localhost:8787/`, enter the setup token from the logs and set your password.

### One-line install

On Debian or Ubuntu with systemd:

```bash
curl -fsSL https://calends.date/install.sh | sudo bash
```

Calends starts on `127.0.0.1:8787`; point your own reverse proxy at it. Run the same command to upgrade.

For upgrades, HTTPS, configuration and other options, see the [self-hosting guide](docs/self-hosting.md).

## AI & MCP

Ask “What renews next week?”, “How much did I spend this year?” or “Netflix went up to $17.99 from today.” Calends provides 36 tools over a stateless [MCP](https://modelcontextprotocol.io) endpoint at `/mcp` using Streamable HTTP.

On the **AI access** page (`/connect`), create a read-only or read/write token, then connect your client. Opening `/mcp` in a browser takes you to this page; MCP clients use the `/mcp` endpoint:

**Claude Code**

```bash
claude mcp add --transport http calends https://your-domain/mcp --header "Authorization: Bearer <token>"
```

**Codex**

```bash
export CALENDS_TOKEN='<token>'
codex mcp add calends --url https://your-domain/mcp --bearer-token-env-var CALENDS_TOKEN
```

Keep `CALENDS_TOKEN` available in the environment that launches Codex. Tools cover subscriptions, spending, trends, receivables and insights, plus changes to prices, plans, status and payments. Every write tool supports `dry_run`; AI access can be turned off in Settings.

## Contributing

Bug reports, translations and pull requests are welcome. See [CONTRIBUTING.md](CONTRIBUTING.md) for local setup, checks and contribution guidelines.

Start with the [architecture](ARCHITECTURE.md) and [code standards](docs/code-standards.md) before changing a subsystem. Coding agents use [AGENTS.md](AGENTS.md); `CLAUDE.md` imports the same instructions.

Built with React 19, Vite, HeroUI / React Aria, shadcn/ui and Cloudflare Workers + D1 (SQLite). Billing, exchange rates and other domain logic are shared between the browser and Worker in `shared/`.

Translations live in `shared/locales/<locale>/<namespace>.json`, with English and Simplified Chinese as the source languages.

## About the name

_Calends_ were the first day of every Roman month, when accounts were settled and debts called in. It is also where the word _calendar_ comes from.

## License

Calends is open source under the MIT License; see [LICENSE](LICENSE). You may use, modify and redistribute it, including commercially, provided you retain the copyright and license notices in copies or substantial portions of the software. If you fork Calends, please use a distinct name and credit Calends as the upstream source so users can distinguish your version from this project.

The Latin letters and numerals use Xiaomi's [MiSans Latin](https://hyperos.mi.com/font/en/), bundled unmodified in `app/public/fonts/` under the [MiSans license](https://hyperos.mi.com/font/en/download/); it is not covered by the MIT License and may not be modified or redistributed on its own.