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.
BusyCal is a powerful, flexible and an extremely customizable calendar app for managing busy schedules, events and tasks.
$9.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for BusyCal: Calendar & 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.
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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
Assumption to check: User interface can be cluttered and overwhelming.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Sync issues with external calendars.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited customization options for tasks and events.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of advanced search features.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
BusyCal is a powerful, flexible and an extremely customizable calendar app for managing busy schedules, events and tasks. BusyCal's unique features include natural language input, customizable calendar views, an integrated to do list, meeting scheduling, travel time, maps integration, tags, alarms, search, weather, moons, birthdays, anniversaries, graphics and more. BusyCal provides reliable support for iCloud, Google Calendar, Google Tasks, Exchange / Microsoft Outlook, Office 365, Todoist and other CalDAV servers, enabling you to sync and share calendars with other Mac and iOS devices running BusyCal or the built-in Calendar app. CALENDAR VIEWS • Display your calendar by Month, Week, Day, List or Year. • Pinch and zoom to control the number of weeks shown per month, and days shown per week. • Customize the calendar appearance including calendar colors, weather, moons, birthdays, anniversaries, event times, week numbers and more. CALENDAR SETS • Manage different, named collections of calendars • Quickly switch between different Calendar Sets • Assign different default calendars to different sets • Create new sets based on existing collections PASSWORD PROTECTION • Enhanced privacy with the option to lock all your calendar sets or just the ones you choose WIDGETS So. Many. Widgets • Upcoming • Event List & Calendar • Calendar & Heatmap • Today's Date • Next two days • This week • Next two weeks EVENTS • Create events manually or automatically using natural language. • Choose from a wide range of attributes to display when viewing or editing events including travel time, time zones, attendees, contacts, tags, maps, last edit time, and more. • Add tags to events to track projects and important events. TASKS • Tasks are displayed directly in the calendar and carry-forward until completed. • Tasks can be undated, or scheduled to occur on a specific date or time. • Tasks can be scheduled to repeat daily, weekly, monthly, etc. • Tasks can be sorted and filtered by date, priority, calendar or title. JOURNALS • Journal entries you create are displayed directly in the calendar as all-day events • Journal can be scheduled to repeat daily, weekly, monthly, etc. TRAVEL TIME, LOCATIONS & MAPS • Create and use Favorite Time Zones • Supports Location Services for adding locations to events. • Supports both Apple Maps and Google Maps for driving directions. • Travel time allows you to block out time to travel to an appointment. • Alarms can warn you in advance of travel time when it's time to leave. PERSONALIZATION • Display Birthdays and Anniversaries, including birthday age and anniversary number. • Display a live 10-day weather forecast. • Display phases of the moon. • Display graphics created in BusyCal for macOS. SYNC & SHARE CALENDARS • Sync and share calendars with iCloud, Google Calendar, Exchange, Outlook, Office 365, Todoist, Fruux, Yahoo, Kerio, Zimbra, Oracle, OwnCloud, Confluence, macOS Server, SabreDAV and other CalDAV servers. • Sync with other Mac and iOS devices running BusyCal or the built-in Calendar app. • Add Zoom, Webex, GoTo Meetings accounts to create meetings directly from the app MORE • Year Overview and Highlights • Receive Inbox notifications of meetings and changes to events on shared calendars. • Search your calendar for past and future events and tasks. • Set default settings for events, tasks and alarms. • Dark Mode
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.