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.
Fast, simple, focused
$2.99
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.
Your first Build Kit is free with a verified email.
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 No-BS White Noise: map the core Productivity 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.
Fast, simple, focused. White noise that just works. Generate high-quality background noise for focus, sleep, or relaxation. Five sounds, one purpose: helping you concentrate. • White Noise — Classic broadband static • Brown Noise — Warmer, deeper rumble • Fire — Authentic crackling fireplace • Rain — Natural rainfall with distant thunder • Birds — Peaceful forest ambience **LIQUID GLASS DESIGN** Built for iOS 26 with Apple's revolutionary Liquid Glass design system. Every interface element features authentic glass-like depth with refraction, reflection, and translucency effects that bring a tactile, premium feel to the experience. • Translucent materials that refract surrounding content • Dynamic reflections with specular highlights • Fluid spring-based animations with perfect damping • Multi-layer shadows and gradients for dimensional UI • Seamless morphing between light, dark, and system modes **WHY IT EXISTS** This app harkens back to a time when software could be built for a single purpose and be fast, simple, and lightweight. Inspired by Craig Mod's philosophy on fast software, it prioritizes speed and simplicity over feature bloat. No tracking. No analytics. No ads. No BS. Just one fair price. **TECHNICAL HIGHLIGHTS** • Pure Swift with modern iOS development best practices • iOS 26 Liquid Glass with advanced material effects • Battery-efficient overnight use • Works in silent mode • Instant sound switching without glitchy transitions • High-quality procedural audio for tiny app size • WCAG-compliant accessibility throughout • Control Center and lock screen integration • Supports background audio playback **DESIGN PHILOSOPHY** Software should lessen burdens, not increase them. This app: • Launches instantly • Switches sounds without lag • Runs all night without draining battery • Works exactly as expected, every time • Gets out of your way so you can focus on what matters Built for people who value their time and attention.
Written user reviews are not shown here. Check current App Store reviews >
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 sound options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No background play feature
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization for sound mixing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No sleep timer feature
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.
Not assessed in a Build Kit yet.
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.