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.
InstaCal is a fast, complete calendar for iPhone and iPad: six views built for touch, your events and Apple Reminders in one agenda, and natural-language Quick Add in 12 languages
$19.99
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.
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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 InstaCal: Menu Bar 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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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: Limited integration with other calendar services
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of customization options for events
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No ability to manage tasks alongside events
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No collaborative features for events
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.
InstaCal is a fast, complete calendar for iPhone and iPad: six views built for touch, your events and Apple Reminders in one agenda, and natural-language Quick Add in 12 languages. One purchase includes native Mac and Apple Watch apps too—no subscription, no platform add-on. ON IPHONE AND IPAD Take the whole calendar with you in six touch-optimized views: Agenda, Day, Week, Month, Quarter and Year. Month and Year scroll continuously, multi-day events draw as banners across the grid, and events, Apple Reminders, weather, moon phases and meeting Join buttons appear together. On iPad, an adaptive multi-pane layout keeps the agenda, calendar and event details visible at once. IN YOUR LANGUAGE InstaCal is fully localized in 12 languages: English, German, French, Spanish, Italian, Dutch, Brazilian Portuguese, Russian, Japanese, Korean, and Simplified and Traditional Chinese. Not only the interface — Quick Add reads dates and times in each one, so "Mittagessen mit Ana morgen um 15 Uhr" or "réunion jeudi à 9h" becomes the right event. Wording follows Apple's own in every language, and week start, date order and 12- or 24-hour time follow your region. ONE PURCHASE. FOUR NATIVE APPS. • iPhone: six calendar views designed for touch • iPad: an adaptive multi-pane calendar, agenda and inspector • Apple Watch: Now, Next and Later at a glance, with complications • Mac: a customizable menu bar panel plus a full calendar window • No subscription or separate mobile unlock PLAN FASTER • Create events and reminders with natural-language Quick Add, in any of the 12 languages • Move, rename or cancel events with Quick Edit • Search from the same field • Add plans with Siri, Shortcuts and the Quick Add Control STAY AHEAD • Calendar events and Apple Reminders in one agenda • Multi-day events as continuous banners across the month • One-tap Join buttons for online meetings • An invitation inbox: pending invites ring a bell until you answer, and you reply right there • Weather and moon phases in your day headers • Alert and repeat badges on events at a glance • Countdowns to the dates that matter • Travel time, leave-by guidance and notifications WIDGETS AND LIVE ACTIVITIES • Ten widgets — agenda, month, next event, now and next, week map, days ahead, countdowns, reminders and more — for the Home Screen, the Lock Screen and the Mac desktop • A Live Activity keeps your next event on the Lock Screen and in the Dynamic Island, counting down to its start • A Quick Add control for Control Center and the Action button • Eleven Apple Watch complications: now and next, leave by, countdowns, conflicts, today's load and more MAKE IT YOURS • Arrange every button on your bars — or fold the view switcher into one compact button, with a press-and-hold shortcut straight to the view you choose • Calendar sets, customizable colors and a second time zone • Your settings follow your devices through your own iCloud ON MAC Click the menu bar or press a global shortcut to see what's next without losing focus. Open the full calendar window for Day, Week, Month, Quarter, Year and List views, then drag events to reschedule or resize them. WORKS WITH THE CALENDARS YOU ALREADY USE Use calendars available through Apple Calendar, or connect Google and Microsoft accounts directly for richer event and invitation support. ZERO DATA RETENTION InstaCal has no servers, no account and no sign-up—nothing about you is collected, stored or analyzed by us. Ever. There are no analytics and no tracking of any kind. Your calendar stays on your device and syncs through the accounts you already own; settings sync travels through your personal iCloud; natural-language parsing happens on your device in all 12 languages; account tokens never leave Apple's Keychain. Some features require supported devices or services.
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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.