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.
M-Cal is a simple, thoughtful calendar for iPhone and Mac.
$3.99
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.
First kit free with a verified email
Combine features and design from your favorite apps.
Your first Build Kit is free with a verified email.
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.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
M-Cal is a simple, thoughtful calendar for iPhone and Mac. It reads and writes the events already in your Calendar, so your iCloud and other events are ready to use right away. One purchase works on both iPhone and Mac. ■ Never miss what matters Mark an event as "Important" and it appears in a bar at the top of the screen, with its date and a countdown. Birthdays and key dates are always in view. ■ Clear month and list views • The month view shows event titles clearly inside each bar • The list view shows upcoming events in order • Search by period, by calendar, or only your important events ■ Fast to enter • Past events with the same title show up as suggestions. Tap one to copy its time, place, and more • URL, location, notes, and multiple reminders (up to 5) • Detailed recurrence (specific day of the month, end of the month, and more) • On Mac, press ⌘K to add an event quickly from a sentence ■ 10 kinds of widgets Choose from this month, upcoming events, today, calendar plus events, and more. ■ And more • Change each calendar's color, show or hide it, and reorder it (synced between iPhone and Mac) • Duplicate events, import and export .ics files • Available in Japanese, English, Korean, Chinese (Simplified and Traditional), French, German, Spanish, Italian, Portuguese, Dutch, and Arabic ■ Privacy M-Cal does not collect any data and does not send anything to external servers. Your events stay on your device and in your own calendars, such as iCloud.
Written user reviews are not shown here. Check current App Store reviews >
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.
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.
Not assessed in a Build Kit yet.
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.