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 is a free, easy-to-use countdown and reminder app for all of life's big events.
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 Countdown: map the core Utilities 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.
Countdown is a free, easy-to-use countdown and reminder app for all of life's big events. Your next vacation, birthday, wedding, concert, graduation or retirement is always one glance away. Create unlimited events and make each one your own. Downloaded over 20 million times. It's been a joy to shape Countdown with your feedback for more than eight years. We're looking forward to many more. ——— WIDGETS & APPLE WATCH ——— • See your next event with free circular and inline Lock Screen widgets • Show one event or a list of upcoming events in Home Screen widgets, and filter lists by tag or pinned events (Premium) • Show your event's emoji, title and time left in the rectangular Lock Screen widget, and keep countdowns visible in StandBy (Premium) • Check your countdowns on Apple Watch and add them to your watch face ——— REMINDERS & ALARMS ——— • Get a reminder on the big day and the day before, at a time you set • Add custom reminders minutes, hours, days, weeks or months in advance (Premium) • Set alarms that ring even when your iPhone is on silent (Premium; requires iOS 26.1 or later) ——— MAKE IT YOURS ——— • Pick an emoji and a color for every countdown, and add notes • Make events repeat every day, week, month or year, or on your own schedule, like every two weeks or the last Friday of the month • See the age someone turns on their birthday and the years celebrated on an anniversary • Add holidays and big events in one tap from suggestions for your country • Count only weekdays, or see the time since a past event • Choose how you see the time left, with units from years to seconds (Premium) ——— STAY ORGANIZED ——— • Group events with tags and pin your favorites to the top • Archive events once they pass, so your list shows what's next • Archive or delete past events automatically (Premium) • Sort by date or drag events into your own order • Search for events, duplicate them and edit several at once ——— SYNC, IMPORT & SHARE ——— • Your events stay up to date on your iPhone, iPad and Mac with iCloud • Bring in events from your calendars and birthdays from your contacts • Automatically turn new calendar events into countdowns with Auto Import (Premium) • Add your countdowns to your calendar • Send a link so friends and family can count down with you • Check countdowns with Siri and create them with Shortcuts ——— YOUR PRIVACY ——— Your plans are personal. We never use your countdowns for advertising, and our analytics never see the titles, dates or notes you enter. ——— PREMIUM ——— One purchase. No subscriptions. Unlock all widgets, custom reminders, alarms, Auto Import, every countdown format and more. Premium also removes ads. ——— QUESTIONS OR FEEDBACK? ——— We love hearing from you and read every email. Get in touch at [email protected]
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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 countdowns.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No widget support for quick view.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficulties sharing countdowns across platforms.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase confusion.
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.