App Overview

Fantastical Calendar icon

Fantastical Calendar

Flexibits Inc. · Productivity

Fantastical is the award-winning calendar app with powerful features including intuitive natural language text parsing, beautiful full calendar day, week, month, quarter and year views, tasks, time zone support, and m...

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.2
22,475 ratings · Top 30%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Fantastical Calendar: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Offer advanced notification settings and custom alerts.

Assumption to check: Limited customization options for event notifications.

Validate with people who use this workflow before building.

Hypothesis 2

Implement a simpler onboarding process and intuitive design.

Assumption to check: Overly complex interface for new users.

Validate with people who use this workflow before building.

Hypothesis 3

Enhance sync capabilities and reliability.

Assumption to check: Sync issues with third-party calendars.

Validate with people who use this workflow before building.

Hypothesis 4

Add features for sharing events and collaborating on tasks.

Assumption to check: Lack of collaboration features.

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

Fantastical is the award-winning calendar app with powerful features including intuitive natural language text parsing, beautiful full calendar day, week, month, quarter and year views, tasks, time zone support, and much, much more. TRY FANTASTICAL FOR FREE • Beautiful, clean, and easy to use calendar app allowing you to manage basic events • The DayTicker and calendar makes your schedule look the nicest it ever has • Full screen day, week, month, quarter, and year views • Full task support including Todoist and Google Tasks • 3 day weather forecast (powered by AccuWeather) • 14 day free trial for Flexibits Premium UPGRADE TO FLEXIBITS PREMIUM FOR EVEN MORE (requires subscription) • Includes Fantastical on all devices: Mac, iPhone, Apple Watch, and iPad • Openings: Schedule events based on your availability • Proposals: Create meeting polls • Add Zoom, Google Meet, Webex, and Microsoft Teams calls • Extended 10 day weather forecast with RealFeel and MinuteCast up-to-the-minute weather data (powered by AccuWeather) • Browse and instantly subscribe to interesting calendars, including sports, TV shows, holidays, and much more (powered by SchedJoules) • Calendar sets - quickly toggle multiple calendars on or off with a simple click or automatically when you leave or arrive, based on location • Event and task templates • Sync calendar sets and templates across devices • Apple Watch app with Up Next and Weather (and works over LTE) • Parser autocomplete recommendations for invitees, locations, and calendars/task lists • Propose multiple times to easily ask people when they can meet • Combine duplicate events across multiple calendars • Invitees and availability lookups • Respond to event invitations • Default alerts • Time zone override • Favorite time zones • Push updates for Google and Exchange • Set event travel time and receive time to leave notifications • Custom event colors • Custom home screen icons • Custom alert sounds • Hide events without deleting them • Add attachments to events on iCloud, Google, and Exchange • Priority email support ADDING NEW EVENTS OR TASKS IS FAST AND FUN • The easiest and fastest way to add new events or tasks • Type in your details or use dictation and watch your words magically turn into an actual event or task! • Powerful parser features, including: - Create tasks by starting your sentence with “task” ”reminder", "todo", or "remind me to" - Powerful and expressive repeating events such as third Thursday of every month, every weekend, last weekday of the month, and more - Create alerts with phrases like "remind me tomorrow at 3PM", "alert 1 hour before", or "alarm 3PM" THE BEST TASKS APP, TOO • See your events and dated tasks together in the main list • Add tasks directly from the Tasks list or new event screen - just flip the switch to toggle between events and tasks • Set dates, times, and geofences (when I arrive/when I leave) • Support for iCloud Reminders, Todoist, and Google Tasks WORKS THE WAY YOU DO • Connects to your favorite calendar services including iCloud, Google, Exchange, Office 365, Todoist, and more • Automatically add alarms to your new events • Fantastical is fully localized in English, French, German, Italian, Japanese, Spanish, and Portuguese • Start typing your event or task in any of these languages and Fantastical will automagically understand! EVEN MORE FANTASTICAL • Lots and lots of iOS and iPadOS widgets • Background app updating enables events, tasks, and alerts to be pushed to Fantastical even if you don't launch the app often • Birthdays and Anniversaries - see your contact’s details or send a quick birthday or anniverary greeting • Handoff support between Fantastical for Mac, iPhone, and iPad • Time zone support including floating time zone support • Dark and light themes • Stickers • Accessibility support • And much, much more!

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

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BUILD KIT DIFFICULTY
Advanced

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.