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.
Lofi Rain is a lofi player built around one idea: you shouldn’t have to DJ your own focus session.
$4.99
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.
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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 Lofi Rain: Focus Timer: 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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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 ambient sound options
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No reminders for timer sessions
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of user customization
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No data analytics on focus sessions
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.
Lofi Rain is a lofi player built around one idea: you shouldn’t have to DJ your own focus session. Press play and lofirain automatically builds a session from original lofi tracks, selected for the companion you’re listening with. No playlists to manage, no browsing rabbit hole, no decisions to make. Just start listening and settle in. BUILD YOUR SOUNDSCAPE Layer ambient sound over the music to create the room you wish you were in: - Rain — neon window drizzle, midnight downpour, vinyl-crackle rain - Fire — cozy campfire, dusty embers - Nature — birdsong, a sleepy creek - Urban — late-night city, a lively café A TIMER THAT KEEPS YOU HONEST Set a 15, 30, or 60 minute session and let the music carry you through it. When the timer ends, playback winds down so you can work, study, or fall asleep without leaving sound running all night. WATCH YOUR FOCUS ADD UP lofirain quietly counts your completed sessions and shows a weekly listening summary. No streak guilt. No gamification. Just a record that you showed up. MADE TO STAY OUT OF YOUR WAY - No ads - Download tracks for offline listening - Keep listening while using other apps - A calm, scenic interface that feels good left open on your desk Whether you’re writing late at night, studying, working, or winding down with rain, lofirain gives you the right sound for the moment—with none of the fiddling. Privacy Policy: https://www.lofirain.io/privacy Terms of Service: https://www.lofirain.io/terms Press play. Settle in. Get to work.
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.