App Overview

iBone - the Pocket Trombone icon

iBone - the Pocket Trombone

Spoonjack, LLC · Music

-NOW ON SALE!- Winner of the 'Best Musical Instrument App' in the Best App Ever Awards and iTunes Rewind pick

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.7
21 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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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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for iBone - the Pocket Trombone: 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

Expand library of sounds and in-app purchases.

Assumption to check: Limited sound options compared to real instruments

Validate with people who use this workflow before building.

Hypothesis 2

Simplify navigation and add tutorial features.

Assumption to check: User interface can be confusing for beginners

Validate with people who use this workflow before building.

Hypothesis 3

Provide clearer descriptions and previews of purchase items.

Assumption to check: In-app purchases can be unclear

Validate with people who use this workflow before building.

Hypothesis 4

Add basic audio editing tools for recorded sessions.

Assumption to check: Recording feature may lack editing options

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

-NOW ON SALE!- Winner of the 'Best Musical Instrument App' in the Best App Ever Awards and iTunes Rewind pick. Not just a tool for trombonists, anyone can play -- iBone shows you how! "...a great tool for trombonists..." - Robin Eubanks, Trombonist with EB3, Dave Holland, SFJAZZ Collective, 2009 Downbeat Reader's Poll 'Best Trombonist' "Brilliant! ...great fun to play with too" - Carol Jarvis, Trombonist with Seal and Sting, Founder Bones Apart "Future of virtual brass?" - Music Inc Mag "...iBone is an interesting experimental blend of gameplay and utility." - Wired, Game|Life It's the Trombone plus more for your iPhone, iPod Touch and iPad. Play it anywhere. Waiting for the bus? Work a little slow? Friend to impress? Simply itching to learn? Whip out your iBone. Practice and learn scales and songs. Even play-a-long with music from your iPod library -- accompany the lead, or take the solo spot. Don't have a clue? Play-a-long with a tune from the iBone Songbook and let roboBone show you the way. It's easy: 1. Touch or blow to make a sound. 2. Slide your finger to change pitch. 3. Raise and lower the bell to change volume. With iBone, you can cover the Trombone's standard two and a half octave range -- slur up and down, slide in and out, and easily play way out of tune. It's the closest you'll get to the real thing. No clue about the real thing? Pick a tune from the iBone Songbook, and let roboBone show you the way as you play along with the band accompaniment. Just tap the rings at the bottom of their fall to hit the right note at the right time. iBone includes seven songs at no additional charge: - 2001: Also Sprach Zarathustra with orchestra - Aura Lee with piano - Air (on a G string) with guitar - Greensleeves with accordion - Guantanmera with bass, bongos, guitar and drums - Ride of the Valkyries with orchestra - Twinkle Twinkle Little Star with piano Additional songs can be purchased and downloaded. Some of these include: - Sloop John B with Rhythm - Man of Constant Sorrow with Banjo - Carol of the Bells with Brass - First Noel with Orchestra - O Silent Night with Strings - O Little Town of Bethlehem with Organ and more! With more to come. Whether you play Trombone and need something more portable, or you've never touched one but want to learn, iBone. Visit http://ibone.spoonjack.com to see it in action. Have your own video to share? Comments? Suggestions? We'd love to hear from you. Please contact us at [email protected]. --- FAQ Q. How do I play with my own music? A. Start the song before loading iBone, and control it by double-clicking the 'Home' button or swiping up to get 'Home'. Q. Why don't I hear anything? A. You probably have left the 'Silent' switch on. It's located on the upper left side of your phone. Any other questions? Please contact us!

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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.

SUGGESTED BUILD STACK
React Native
Expo
Zustand
expo-av
React Navigation
React Native Slider
BUILD KIT DIFFICULTY
Advanced

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.