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 calendar and task planner built for busy schedules
$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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Generating… usually about a minute.
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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
BusyCal is a calendar and task planner built for busy schedules. It connects to every account you already use, shows your events and tasks side by side, and bends to the way you work: pinch to see more days or weeks, type events the way you would say them, and keep everything in sync with BusyCal for Mac. One-time purchase. No subscription. YOUR CALENDAR, YOUR WAY • Day, Week, Month, Year and List views, plus a dedicated Task list • Pinch to zoom: 2 to 14 days per week and 2 to 8 weeks per month, with separate portrait and landscape layouts • Customize colors, text size, weekend shading, week numbers and working hours, or show a Chinese, Hebrew, Islamic or Japanese calendar alongside • Year view as a wall planner or heat map, with Highlights that reveal your busiest months, top calendars and meeting stats TYPE IT THE WAY YOU WOULD SAY IT • Type "Lunch with Sam next Tuesday at noon" or "Standup every weekday at 9:30" and BusyCal fills in the date, time and repeat as you type • Understands alarms, time zones, calendars (/work) and links, in English, German, French, Italian, Spanish, Dutch, Japanese, Korean and Simplified Chinese TASKS IN YOUR CALENDAR • Dated, timed and undated tasks appear right in your calendar and carry forward until done • Priorities, repeats, and a Task list you can sort by due date, priority, calendar, tag or by hand • Works with Apple Reminders, iCloud, Google Tasks, Todoist and Fastmail EVERY ACCOUNT, ONE APP • iCloud, Google Calendar, Microsoft 365, Outlook.com, Exchange, Yahoo, Fastmail, Fruux and any CalDAV server, plus WebDAV subscriptions for holidays and sports • Push updates where your server supports them, and accounts you add once are offered to your other devices • Syncs with BusyCal for Mac, Apple Calendar and any other app on the same accounts MEETINGS AND INVITES • Invite attendees, and accept, decline or reply Maybe straight from the Inbox • Zoom, Microsoft Teams, Google Meet, Webex and GoTo links become one-tap join buttons, and you can create Zoom and Teams meetings from inside the app • Block time on a second calendar in a couple of taps, with or without the details WIDGETS, WATCH, SIRI AND SHORTCUTS • Home Screen widgets for what is next, your agenda, the week, two weeks, three weeks, and tasks you can complete from the widget • Lock Screen widgets and Control Center buttons for new events and tasks • Apple Watch app with calendar, today, up next and tasks views, plus complications for your watch face • Siri: "Add lunch with Sam tomorrow at noon", "What's coming up", "When am I free" • Shortcuts actions to find, create, move, defer and complete items, and a Focus filter that switches calendar sets TRAVEL TIME, MAPS AND TIME ZONES • Add travel time to an event and get a leave-now alert based on real driving or walking time • Maps inside event details, with directions in Apple Maps, Google Maps, Waze, Citymapper or TomTom GO • Favorite time zones, and events that start and end in different zones TAGS, CALENDAR SETS AND PRIVACY • Color-coded tags to track projects, people and priorities across calendars • Calendar sets: named groups of calendars, each with its own default calendars and preferred view, synced across your devices • Lock the app, or just certain calendar sets, with Face ID or Touch ID AND MORE • Weather and moon phases on your calendar • Birthdays and anniversaries from Contacts, with age and years • Search titles, locations, notes and tags across past and future BusyCal has been trusted by Mac users for more than a decade. The iPhone and iPad app is its full-featured companion, made by the same team. Questions? Visit busymac.com/docs or write to us from within the app.
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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.
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.