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Prisma Calendar

The Ultimate Temporal Visualization Engine for Obsidian. A schema-agnostic visualization layer that turns any note with a date into a first-class citizen on your timeline. No rigid schemas, no predefined fields — just your data, your rules, your filters.

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Prisma Calendar — Obsidian calendar plugin preview
Install and start using immediately

What you get for free

Install and use immediately — no signup, no payment. Here's everything included on day one.

Recurring Events Engine

9 built-in recurrence types + custom intervals (every N days/weeks/months). Time propagation, frontmatter propagation, virtual events beyond generation horizon.

Full Undo/Redo

50-action history per calendar. Covers creates, edits, deletes, moves, clones, skips, drag-and-drop, resizing, and all batch operations with single-step undo.

Batch Operations

Multi-select with delete, duplicate, move ±7 days, clone, skip, mark done/undone, assign categories, batch frontmatter updates, and more.

Time Tracker

Built-in stopwatch with start, continue, break, resume, minimize to background. Auto break accumulation for accurate time logging.

Statistics Dashboard

Daily, weekly, monthly, and all-time views. Pie charts, breakdown tables, aggregation by name or category.

Color Rules Engine

JavaScript expressions mapping frontmatter to colors. First-match-wins logic with live preview updates.

Advanced Filtering

Text search + JavaScript expression filters + saved filter presets. Combine with AND logic for precise event queries.

Notifications

Desktop alerts with configurable lead time, snooze, and per-event overrides. Never miss an important event.

Holidays & Locale

Automatic holiday detection for 50+ countries (offline). ~20 language locales. Mobile support included.

4 Views + Event Groups

Month, Week, Day, List views with CTRL+scroll zoom and density options. Auto-grouping by recurring rule, category, or name with statistics bar.

And Much More

Title autocomplete, ZettelID naming, Templater integration, global event search, 30+ hotkeys, and more.

Pro

Additional features for power users

Everything above stays free. Pro unlocks these additional capabilities.

AI Chat Panel

Built-in sidebar with Claude and GPT. Query your calendar, create/edit events via natural language, auto-plan your schedule. Conversation persistence across sessions.

CalDAV & ICS Sync

Two-way sync with Google Calendar, Apple Calendar, Fastmail, Nextcloud, iCloud. ICS URL subscriptions and import/export with RRULE preservation.

Programmatic API

window.PrismaCalendar and URL scheme for full CRUD, batch ops, statistics, settings, and navigation from external scripts.

Unlimited Calendars & Presets

Remove the 3-calendar and 2-preset limits. Create as many calendars and event presets as your workflow needs.

Auto-Assign Category Presets

Map comma-separated event names to categories. Events auto-match on creation — keeps your calendar organized without manual effort.

Priority Support

First in line for help and feature requests. Direct, priority assistance from the developer.

Free vs Pro

Free

Forever · No account needed
  • Up to 3 calendars, 2 event presets
  • 4 views: Month, Week, Day, List
  • Full recurring events (9 types + custom)
  • 50-action undo/redo history
  • Batch operations (10+ bulk actions)
  • Time tracker & Statistics dashboard
  • Color rules, filters, notifications
  • Title autocomplete with ghost text
  • Holidays (50+ countries), 30+ hotkeys
  • ZettelID, Templater, mobile support

Pro

From $3/mo

Everything in Free, plus:

  • Unlimited calendars & event presets
  • AI Chat — Claude & GPT, query/edit/plan modes
  • CalDAV & ICS sync + import/export
  • Programmatic API & URL scheme
  • Auto-assign category name presets
  • Priority support

30 days free — no payment until trial ends

Prisma Calendar Pro

$3 /mo
Billed $36/year Save $12/yr

Then $3/mo (billed yearly) after 30-day free trial · Cancel anytime

  • Everything in Free, plus:
  • Unlimited calendars & event presets
  • AI Chat — Claude & GPT (query, edit, plan)
  • CalDAV & ICS sync + import/export
  • Programmatic API & URL scheme
  • Auto-assign category name presets
  • Priority customer support
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30-day free trial
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Works offline
Priority support

Frequently Asked Questions

Is Prisma Calendar free to use?
Yes — and the free version is not a demo. You get a full-featured temporal engine: recurring events with 9 recurrence types, 50-action undo/redo, 10+ batch operations, a time tracker, a statistics dashboard, color rules, JS expression filters, desktop notifications, holidays for 50+ countries, title autocomplete, ZettelID naming, Templater integration, 30+ hotkeys, and more. All free, no account needed. Pro adds AI chat, CalDAV/ICS sync, programmatic API, unlimited calendars, and auto-assign category presets.
How does the 30-day free trial work?
When you sign up for Pro, you get 30 full days at no cost. You won't be charged until the trial ends. Cancel anytime during the trial and pay nothing — no questions asked.
Can I cancel anytime?
Absolutely. Cancel from your account page at any time. If you cancel during the trial, you're never charged. After, you keep access until the end of your billing period.
Why is the yearly plan cheaper?
Yearly saves 25% — $3/month billed annually ($36/year) vs $4/month. Best value if you use Prisma Calendar long-term.
Do I need an internet connection?
Not for daily use. We issue a license key you enter in plugin settings. It works offline and re-verifies roughly weekly. Your notes never leave your vault — everything is local.
What happens to my data?
Your data is 100% yours. Prisma Calendar stores everything locally in your Obsidian vault. We never access, collect, or transmit your notes. The only network call is periodic license verification.
What support do Pro users get?
Pro customers get priority support — first in line for help and feature requests via GitHub issues or email.
Prisma Calendar — Disclosure
  • • Prisma Calendar is developed by Matej Vavro and is not affiliated with Obsidian.
  • • An account and payment are required for Pro access. A 30-day free trial is available.
  • • Prisma Calendar works fully offline. Internet is only needed for periodic license verification (approximately weekly).
  • • Prisma Calendar does not access, collect, or transmit your vault data. All notes remain local.
  • • The plugin source code is available on GitHub. Backend license verification is proprietary.
Full Playlist
Documentation
GitHub Docs Playlist