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.
Celtic Sounds is a fully transposable MIDI sound module with seven traditional Irish and Scottish musical instruments:
$9.99 · 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.
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Combine features and design from your favorite apps.
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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 Celtic Sounds MIDI Module: 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 other music apps
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: MIDI setup can be complex for beginners
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Occasional performance lags when loading sounds
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.
Celtic Sounds is a fully transposable MIDI sound module with seven traditional Irish and Scottish musical instruments: High-D Tin Whistle Wooden Flute Uilleann Pipes Chanter, Drones, and Baritone/Tenor Regulator Pairs Anglo Concertina Button Accordion Great Highland Bagpipes Chanter and Drones Scottish Smallpipes Chanter and Drones Every note on the instruments have been individually to provide a very authentic sound. The app is a CoreMIDI Sound Module for use with CoreMIDI file players and other CoreMIDI controller apps. You may also play the sounds using a MIDI keyboard or other MIDI controller attached to the device using a MIDI interface connected to the Lightning port. The app also works as an Audiobus 2 source module and is compatible with Audiobus 3. Inter-App Audio support is provided by Audiobus. Using the controls, set your instrument, transposition, volume, reverb style, reverb level, MIDI channel, and MIDI pitch bend values. Use the "Transpose Semitones" slider to shift the entire instrument up or down up to one octave in semitone increments. This setting shifts the pitch of the sound but does not change the MIDI note numbers the app responds to. Touch the number to the right of the "Transpose Semitones" slider to reset the transposition to zero semitones. Choose your reverb style and level from four options: Room, Hall1, Hall2, or Church If you have a MIDI "stuck note" touch the "Shhh" button at the top right to stop all sounds. The app responds to both MIDI note-on velocity and pitch bend messages on the selected MIDI channel. Set the maximum pitch bend response using the "Pitch Bend Semitones". Default is two semitones. The MIDI note ranges of the instruments are: High-D Tin Whistle - D3 (62) - D5 (86) Wooden Flute - D3 (62) - D5 (86) Anglo Concertina - C2 (48) - A5 (93) Button Accordion - G2 (53) - E5 (88) Highland Pipes - A3 (68) - Bb4 (82) Smallpipes - A3 (68) - Bb4 (82) When playing the Uilleann Pipes instrument, the following special MIDI notes, starting on C1 (36) are used for the drone and regulator sounds: Single regulator notes: C1 (36) - Bass regulator G C#1 (37) - Bass regulator A D1 (38) - Bass regulator B D#1 (39) - Bass regulator C E1 (40) - Baritone regulator D F1 (41) - Baritone regulator F# F#1 (42) - Baritone regulator G G1 (43) - Baritone regulator A G#1 (44) - Tenor regulator F# A1 (45) - Tenor regulator G A#1 (46) - Tenor regulator A B1 (47) - Tenor regulator B C2 (48) - Tenor regulator C Drones: D2 (50) - Lynch Drones D#2(51) - Crowley Drones Regulator pairs: E2 (52) - D/F# Baritone/Tenor Regulator Pair F2 (53) - D/G Baritone/Tenor Regulator Pair F#2 (54) - F#/A Baritone/Tenor Regulator Pair G2 (55) - G/B Baritone/Tenor Regulator Pair G#2 (56) - G/C Baritone/Tenor Regulator Pair A2 (57) - A/C Baritone/Tenor Regulator Pair Uilleann Pipes drones key triggers (D2 and D#2) are "latching" . The drones start on the first press of the trigger key, stop on the second. The Uilleann Pipes chanter notes start at D3 (62) and go to D5 (86) When playing the Great Highland Bagpipes and Smallpipes instruments, the drones, are triggered on receipt of D#2 (51) and are latching. The drones start on the first press of the trigger key, stop on the second. When playing the bagpipes instruments, any pitch bend messages received only effect the chanter notes, not the drones or regulators. The bagpipes instruments are setup for the default WARBL GHB controller note mapping for notes and drone switch. MIDI Transpose Control for use with MIDI Chanters and other MIDI controllers: Use the "MIDI Transpose Semitones" slider to shift the incoming MIDI note messages up or down up to one octave in semitone increments. This is useful for MIDI chanters or other controllers that have a fixed message range. Touch the number to the right of the "MIDI Transpose Semitones" slider to reset the MIDI transposition to zero semitones.
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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.