App Overview

Calendar 366: Events & Tasks icon

Calendar 366: Events & Tasks

Vincent Miethe · Productivity

For all your plans!

$9.99 · In-app purchases

PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
543 ratings · Top 15%

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.

Build your own version

Build Kit

Make this idea yours

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

First kit free with a verified email

Add to a Remix

Combine features and design from your favorite apps.

Kit ready. Verify your email to download it.

What's included18 files

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

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
Preview a sample Build Kit No email needed

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.

JavaScript is required to complete mailbox verification.

Free quick prompt For a smaller starting point

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 Calendar 366: Events & Tasks: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

Preview ready. Verify your email to reveal and copy the full prompt.

JavaScript is required to complete mailbox verification. Return to this prompt preview.

Continue in Rork copies the full prompt to your clipboard first, then opens Rork in a new tab.

Continue in Rork >

Affiliate link: CloneChart may earn a commission at no extra cost

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

Allow users to customize event colors and task categories.

Assumption to check: Limited customization options for events/tasks.

Validate with people who use this workflow before building.

Hypothesis 2

Implement reliable and fast sync with iCloud and Google Calendar.

Assumption to check: Sync issues with calendar services.

Validate with people who use this workflow before building.

Hypothesis 3

Streamline onboarding process with guided tutorials.

Assumption to check: Overwhelming interface for new users.

Validate with people who use this workflow before building.

Hypothesis 4

Introduce advanced options for creating recurring tasks.

Assumption to check: Limited recurring task functionality.

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

For all your plans! "Conquer your calendar" - The Daily List (App Store) "Our Favourite Apple Watch Apps" - Editor's Choice (App Store) "My Must-Have iOS Apps" - Federico Viticci (macstories.net) Appointments and to-dos, meetings and deadlines, birthdays and dates - make the most of your time with Calendar 366! Anything a calendar can do... Calendar 366 can do better - and all of its functions can be adjusted easily and intuitively. A dentist appointment is not a friend’s wedding, and your calendar should know the difference. How and how often do you want to be reminded about what’s important? Create a calendar that matches your preferences and priorities. INDIVIDUAL DISPLAY Pick your preferences – year or month, week or day, list or agenda, from light red to dark to darkest blue... EASY USE Create your dates by natural text input, for example: "Meeting tomorrow 10am Melrose Ave /work", or "Sauna! next Sunday 3pm -360", or simply "time to read tomorrow" – any way you like it. Easily find and change events and reminders, repeat them, add attachments* and create notes without any hassle. ENDLESS APPLICATIONS Sync documents and attachments easily with all devices via iCloud*. Easily send, accept or decline invitations. Find a location on the go: simply search, save, and open in Apple, Google maps, HERE WeGo, Waze or maps.me. Find your events via Spotlight. Organise your events & to-dos with Calendar Sets... TOTAL OVERVIEW See all that’s important today with the Calendar 366 Today widget. APPLE WATCH-ABLE Of course, Calendar 366 also works on the Apple Watch - giving you your complete calendar overview on your wrist. Simply use voice input to create new events or reminders. SPEAKS YOUR LANGUAGE Calendar 366 is fully localized in English, German, Spanish, French, Japanese, Dutch, Italien, Polish and Chinese. MAIN FEATURES AT A GLANCE • Apple Watch app (iPhone) • Apple Watch Complications: Modular (Small & Large), Utilitarian (Small, Small Flat & Large) & Circular, Extra Large, Graphic (Corner, Bezel, Circular, Rectangular) • 10 Home Screen Widgets • 5 Lock Screen Widgets (2 variations each) • Join meetings with a tap • Notifications for invitations and shared calendar changes • Siri Watch Face support • Siri Shortcut support • All events and reminders at a glance • 8 views, 9 themes • Spotlight integration • Calendar Sets • Custom colors for events and reminders • Custom font sizes • Location-based reminders • Travel Time Support (Calculate travel times by car, on foot) • Rich Notifications (Snooze..., Complete) • Share your events and reminders via Mail, WhatsApp, Messages, Signal etc... • Key Commands for external keyboards • Easy, intuitive creation, copying and moving of appointments and reminders by drag & drop • Easily invite attendees and manage invitations • No pre-requisite setup (All iOS supported calendar services available: iCloud, Google, Exchange, Outlook, CalDAV) • Compatible on all Apple devices (iPhone, iPad, Mac) • Add or modify calendars and lists • All views optimized for portrait or landscape • Time zone support • Complex repeating rules • Week numbers • Complete reminders with a tip ... Questions and Contact [email protected], @nspektorapps, https://nspektor.com/support *Calendar 366 or Calendar 366 II for macOS & iCloud account required

Written user reviews are not shown here. Check current App Store reviews >

Screenshots

< Scroll to see more >

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.

SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
react-navigation
@react-native-datepicker
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.