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.
Practice Farm is a library of étude books, orchestral excerpts and Bach, rewritten on the spot for the instrument you play
$9.99
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.
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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 Practice Farm: Etudes, Any Key: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Practice Farm is a library of étude books, orchestral excerpts and Bach, rewritten on the spot for the instrument you play. Choose your instrument once. Every page comes out in your clef, in your range, in any key you want, with the fingerings on the notes and a band to play along with. YOUR INSTRUMENT, OVER THE MUSIC Your instrument is drawn above the page and moves with every note as the music plays: a trombone's slide, the valves of brass and horn, the keys of clarinets, oboe, English horn, bassoon, flutes and saxophones, the fingerboards of the four strings, and two or four mallets over glockenspiel, xylophone, marimba and vibraphone. Tap the hand in the panel's corner, tap a note, and choose your own fingering or position. The page prints your choice and the panel plays it, study by study. Mark any passage, keep it as a clip and loop it. Tap a tempo or expression word on the page and its meaning opens, in eleven languages. LINE MODE On a phone, read any page as one line that scrolls under you. Turn the phone on its side and the notes are big enough to read from the stand; tap once and everything but the music goes away. WHAT'S ON THE SHELF • 307 studies from Arban's Complete Method, by chapter • New: Mozart's concertos for clarinet, flute and bassoon, with the piano; Kreutzer and Wohlfahrt for violin; Sachse, Guilmant and Saint-Saëns for trombone and piano • Weissenborn for bassoon, Ferling for oboe, Rose for clarinet, Andersen for flute, Concone for bass and for voice • Bordogni, Kopprasch, Blazhevich, Slama, Bléger, Müller, Cornette, Belcke • Bach's cello suites, sonatas and partitas, and Telemann's fantasias • 414 orchestral excerpts for 13 instruments • 275 traditional tunes • 365 Bach chorales in four voices 1,963 studies in 49 books, and room for your own. WRITTEN FOR YOU No more reading Bordogni in the wrong clef or Kopprasch out of your range. Tell Practice Farm what you play and every study is rewritten for it: a tuba gets bass clef and valve numbers, a trumpet gets its own transposition, a cellist gets string positions. 39 instruments, each with its own clefs, range and fingering system. ANY KEY Move a study up a semitone, down an octave, or into any key you name. Or take it around the circle of fourths or fifths and get one page with all twelve keys on it, with rest bars between them. PLAY ALONG Drums with a groove. A drone that follows the study when it changes key. And on the 178 studies printed with a piano part, the pianist. Set a tempo by tapping, get counted in, take the repeats. BACH CHORALES Four parts: soprano, alto, tenor and bass. Choose an instrument for each one, a trumpet on the soprano, a horn on the alto, a trombone and a tuba below, and the chorale is transposed on the spot, each part in the right clef and key for the instrument that plays it. Change an instrument and the part changes with it. Read all four parts on one iPad or split the score across two. A ready-made quartet for a studio class, a section rehearsal, or colleagues each reading their own part. YOUR OWN MUSIC Import any MusicXML file and it works like every other study. Export any page as a PDF for a student or a teacher. THE INSTRUMENTS Violin, viola, cello, double bass, guitar, bass guitar, ukulele, flute, piccolo, alto flute, descant and treble recorders, oboe, English horn, clarinets in B flat, A and E flat, bass clarinet, bassoon, contrabassoon, soprano to baritone saxophones, trumpet, French horn, alto, tenor and bass trombones, euphonium, tuba, soprano, alto, tenor and bass voice, glockenspiel, xylophone, marimba and vibraphone. WORKS OFFLINE The whole library is inside the app. Every study, every key, every instrument and the band all work with no internet connection, on a plane or in a practice room with no signal. No account and no subscription. One purchase, for iPad and iPhone. In English, French, German, Italian, Spanish, Portuguese, Dutch, Polish, Japanese, Korean and Simplified Chinese.
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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: Can't play offline
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Algorithm doesn't understand taste
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Shuffle-only on free tier
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.
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.