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.
App Overview
Pitch Pipe+
Featured by Apple as "New and Noteworthy" on the main App Store landing page
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
172 ratings · Top 15%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Pitch Pipe+: 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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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Add more tuning modes and customization options.
Assumption to check: Limited advanced tuning features compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more accurate calibration process.
Assumption to check: Some users report calibration issues.
Validate with people who use this workflow before building.
Hypothesis 3
Enable offline access to core tuning functionalities.
Assumption to check: No offline mode for tuning.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate sharing options to connect with other musicians.
Assumption to check: Lack of social sharing features.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Featured by Apple as "New and Noteworthy" on the main App Store landing page. Pitch Pipe+ is a tuner application for the playback of reference pitches, perfect for singing and tuning instruments. It consists of three views: Chromatic - Playback of all pitches from 6 octaves. Choose between the note sustaining indefinitely or for 3 seconds. Useful for choirs and a-capella singers as reference for starting note. Pitch Pipe - This one is for singers used to using chromatic pitch pipes. Sounds are sampled from actual pitch pipes. Choose between C-C and F-F pipes. Tap a currently playing note to kill it immediately. Guitar - Dedicated guitar tuner lets you tune to guitar samples in addition to the sine wave tone. Auto advance moves down the strings so you don't have to keep reaching for the phone. The following tunings are available: Standard, Dropped D, DADGAD, Open D, Open G, Open A. The last visited view is shown whenever you relaunch the app so you have instant access to your preferred view. Calibrate tuning from A = 414 to 466 Hz. Retina Displays supported.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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BUILD KIT DIFFICULTY
Starter
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.
