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.
The official Google Calendar app helps you stay organized and plan your day with easy event creation, multiple calendars, customizable views, widgets, and tasks.
Free · 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 Google Calendar: Get Organized: 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: Sync issues with multiple devices
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization options for events
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficult navigation for new users
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of integration with other productivity tools
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.
The official Google Calendar app helps you stay organized and plan your day with easy event creation, multiple calendars, customizable views, widgets, and tasks. With Google Calendar, you can: • Get events automatically added to your Calendar from Gmail, including flight, hotel, concert, and restaurant reservations. • Go from using Calendar on your iPhone, iPad, or Apple Watch to your computer without missing a beat when you’re logged into the same Google account. • Consolidate and view Google Calendar events side-by-side with other calendars on your device, including Exchange and iCloud. • Keep family, friends, and colleagues in the loop with shared calendars, so they can view, add, or modify events. • Quickly switch between month, week, and day views. • Stay on top of to-dos by creating and managing tasks alongside your events in Calendar. • Personalize your Google Calendar with light or dark mode or by color-coding your events • Always know what's next while on the go with Google Calendar on Apple Watch by customizing your watch face with Calendar complications or adding widgets. Google Calendar is part of Google Workspace, allowing you and your team to easily connect, create, and collaborate across all your favorite Google tools. You can: • Collaborate in a hybrid work environment by adding a Google Meet video call to an Calendar event • Get access to professional booking pages to easily book clients and customers*. • Schedule meetings with teammates by checking their availability or layering their calendars in a single view • Add your working location to your calendar to make it easier for your teammates to schedule meetings with you*. • Keep everyone on track for a meeting by attaching meeting notes, pre-read materials, and other documents directly to a calendar event. • Use Google Calendar with confidence knowing it’s supported by Google’s enterprise-level privacy, user safety and data security. * Requires a Google Workspace or Google One AI Premium subscription
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.