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.
description
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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 Mellotron XL: map the core Music 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 instrument selection compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent audio playback quality.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of user tutorials or guides.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High price point for casual users.
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.
description this is the official and the only mellotron app with sounds from the original library. it contains 18 sounds from both the mellotron and chamberlin library, emulations of the characteristics of different mellotron and chamberlin models plus a reverb. this instrument supports core midi, audiobus output (audiobus 2 & 3) and midi input (audiobus 3 only). the mellotron is a keyboard instrument that uses magnetic tape to play back recordings where each key has one tape. when you press a key, the tape starts and the corresponding pre-recorded note or sound is played back. when you release the key the tape is quickly rewound back to the start point. invented in 1950 by the american, harry chamberlin, it became popular among recording musicians when it was manufactured in the uk as the "mellotron" (a hyphenation of "melody-electronics"). before the introduction of digital samplers, this was the only way for keyboardists to play real instrument sounds like strings, flutes, rhythm ensembles and sound effects from a keyboard instrument. few people know about mellotrons and chamberlins, but almost everybody has heard the sounds they produce. among the most well-known tracks are beaties "strawberry fields forewer" (flute), moody blues "nights in white satin" (3 violins), oasis "wonderwall" (cello), radiohead "exit music for a film" (choir), lana del rey "ride" (chamberlin flute). we at mellotron.com have collected, conserved and improved mellotrons since 1989, and have been making tape mellotrons since 1999 (the mkvi and mkvii). please check out our website www.mellotron.com for a more complete history, real hardware instruments, our new digital m4000d mellotron and m4000d mini, tapes from the original masters, parts, service and lots of more info.
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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.