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 4000 is a workout app.
$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 Super Awesome Workout 4000: map the core Health & Fitness 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: Lack of user engagement features such as challenges or social sharing
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited integration with wearable devices
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Basic UI with minimal customization options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No nutritional tracking features
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 4000 is a workout app. It picks the workout. It counts the seconds. It says the exercise names out loud so you don't have to think. You just show up. No streaks. No guilt. No email. No "journey." WHAT THE 4000 DOES • Picks a 15 to 20 minute workout based on what day it is. • Strength days: 6 exercises, 2 circuits, roughly 18 minutes of work. • Cardio days: structured intervals on the treadmill or wherever you have. • Rest days: it's asleep. So are you. Or go for a walk. Whatever. HOW IT WORKS • Tap START. The 4000 counts you in. • It announces every exercise out loud, in a font called Bungee, in a voice that means it. • Between sets, it waits. Rest never auto-advances. Tap when you're ready, or say "ready" if you have the mic on. • Locked screen, headphones unplugged, app in the background. It keeps counting. Live Activity and Dynamic Island show the timer without you having to look. EQUIPMENT • A bit of floor space. • Optionally: dumbbells, a band, a treadmill. • That's the list. WHAT THE 4000 WILL NEVER DO • Guilt you about a missed day. Yesterday didn't happen. Today still can. • Track a streak. • Ask for your email. • Sync to a wearable so a CSV of your heart rate ends up on three servers. • Use the word "mindful." WHO MADE THIS A small team that wanted a workout app that respects your time and shuts up during rest. The 4000 was born in a rendering pipeline in April 2026. Its whole job is to count seconds and pick the right six exercises for a Wednesday. The 4000 is proud of you. (That's just an if-statement. But still.)
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.