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.
You're serving 10 customers at once
$2.99 · 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 Booth Calculator: map the core Business 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: Users may find it difficult to input dimensions accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited sharing options for results.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No history of previous calculations.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of customization for cost calculations.
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.
You're serving 10 customers at once. Someone wants 3 pies, another wants 10 with the bundle deal, and someone else just added a coffee. Your brain is doing five things at once and the last thing you need is to get the maths wrong. Booth Calculator was built for exactly that moment. Tap a product. Set a quantity. Done. The total calculates instantly including bundle discounts you've set up in advance. No mental arithmetic. No mistakes. No underpaying yourself. What makes it different: Bundle pricing built in. Sell 10 for €14.50 instead of €15.50? Set it once, it calculates forever. Multiple bundle rules per product. 5 for €12.25 and 10 for €24.50? Both work automatically. Runs completely offline. No WiFi needed at the market. PIN-protected settings. Staff can ring up orders but can't accidentally change your prices. Works in 6 languages: Dutch, English, German, French, Spanish and Chinese (中文). Supports 9 currencies. Take your booth anywhere in Europe. Who is it for? Market vendors. Bakers. Street food stalls. Seasonal pop-up shops. Charity fundraisers. Anyone who sells goods from a booth, stall or stand and needs to calculate orders quickly and confidently in front of a customer. Set it up in 2 minutes. Use it for every customer after that.
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.