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.
Countdown Star is the best way to countdown to — and count up from — all of your favorite events.
$1.99 · 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 Countdown Star (Ad-Free): map the core Entertainment 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 customization options for countdown events
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficulty in managing multiple countdowns
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase for removing ads may deter users
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.
Countdown Star is the best way to countdown to — and count up from — all of your favorite events. Countdown to birthdays, holidays, an upcoming vacation, a wedding, the New Year, parties, sporting events, concerts and more. Count up from anniversaries, the day you were born, and other special events in the past. * How many seconds until your next birthday? * How many months since you were born? * How many days until you graduate from college? * How many hours until your anniversary? * How much time is left until your vacation starts? * How many days until Christmas? * How many minutes until your party begins? * How much time is left until your baby's due date? Countdown Star is the countdown app that lets you choose which events to add, then keeps them in sync across all of your devices. Features: * iCloud Sync — events and wallpapers sync automatically across all your iPhone, iPad, and Apple Watch devices * Celebration Animations — choose Confetti, Fireworks, Balloons, Stars, or Lasers when your countdown reaches zero * Repeating Events — annual events automatically advance to the next year so you never have to update them * Home Screen Widgets — Small, Medium, and Large widgets let you glance at your countdowns without opening the app * Apple Watch — view your events right on your wrist * Add Your Own Events — add as many events as you like * Custom Wallpapers — choose from 15+ built-in wallpapers or use your own photos * Time Zone Support — set each event in any time zone with localized city names * Sort and Search — sort by date, title, or your own custom order; events are sectioned into Countdown and Count Up groups * Favorites and Notifications — mark events as favorites to receive a notification when their countdown reaches zero * Interactive Slider — instantly switch between seconds, minutes, hours, days, weeks, months, or years to see your countdown exactly how you want it * Customizable Timer — choose timer position (Top, Middle, or Bottom), show or hide weeks, and toggle the leading zero * Multiple App Icons — personalize the app icon on your Home Screen Note: Countdown Star is available as a free version (with ads and an optional Remove Ads purchase) and as a paid ad-free version.
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.