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.
Replace the old sand timer in your favorite game with one that packs a punch! The countdown takes center stage in this app as a full-screen timer counts down the seconds
$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.
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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 Countdown: Big Timer & Clock: 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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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 timers
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No reminder notifications for timers
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficult to view multiple timers at once
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No integration with calendar apps
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.
Replace the old sand timer in your favorite game with one that packs a punch! The countdown takes center stage in this app as a full-screen timer counts down the seconds. Run silently, or play a chime or air horn sound to let everyone know that time is up! Perfect for TV broadcasts, classrooms, debates, game shows, sporting events, or anywhere a highly visible stopwatch, timer, or clock with a streamlined appearance is needed. Features: + Beautiful design, maximizing countdown visibility + Tap anywhere to start or stop the countdown + Three modes - stopwatch, timer, or clock + Set a countdown up to 10 hours + Display the time in red, orange, yellow, green, blue, or purple Advanced features: + Optionally show tenths of a second during the last minute for extra excitement + Optionally flash during the last ten seconds + Optionally play an air horn or a chime sound when time is up + Optionally show elapsed time after the timer reaches 0:00 (double-tap or long-press the Timer icon on the settings screen to choose) + The device will not sleep while the timer is running + Background notifications make sure you know when your timer ends + Double-tap the time on the settings screen to switch between 1, 5, and 15-second increments Super-advanced features: + Control the timer remotely using a Bluetooth keyboard: The space bar starts/stops, escape resets, and you can change the countdown time by typing a number followed by enter. + Display the timer on an external screen using AirPlay mirroring, while keeping the controls visible only on your device! + Use side-by-side with other apps on iPad in slide-over or split-view mode
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.