App Overview

iTrump -  '2-inch Trumpet' with Trumpad icon

iTrump - '2-inch Trumpet' with Trumpad

Spoonjack, LLC · Music

The Trumpet plus more for your iPhone or iPod Touch

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
70 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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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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> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for iTrump - '2-inch Trumpet' with Trumpad: 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 song library and provide tutorials.

Assumption to check: Limited song selection and learning resources

Validate with people who use this workflow before building.

Hypothesis 2

Integrate guided lessons for beginners.

Assumption to check: Complexity in mastering trumpet sounds

Validate with people who use this workflow before building.

Hypothesis 3

Add features for sharing recordings and achievements.

Assumption to check: Lack of social features or sharing options

Validate with people who use this workflow before building.

Hypothesis 4

Implement offline caching for songs and lessons.

Assumption to check: No offline access to songs

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

The Trumpet plus more for your iPhone or iPod Touch. Play it anywhere. Practice and learn scales and songs. Jam along with any of your own music. Or play along with a song in the Songbook and let it show you how. It's useful to students and playable by anyone. (*see below for details about the interface) It's easy: 1. Touch or Blow to make a sound 2. Tap the 'valve pads' to set the pitch 3. Raise and lower the bell for volume. And it's capable: Cover the Trumpet's standard notated range -- slur up and down, trill, and even bend notes and add vibrato. It's the closest you'll get to the real thing. No clue about the real thing? Pick a tune from the Songbook, and let it show you the way as you play along with the band accompaniment. Just tap the colored blocks at the bottom of their fall to hit the right note at the right time. iTrump comes free with seven songs: - Theme from 2001: Also sprach Zarathustra with orchestra - Aura Lee with piano - Air (on a G string) with guitar - Greensleeves with accordian - 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 Ochestra - O Silent Night with Strings - O Little Town of Bethlehem with Organ and more! With more to come. Whether you play Trumpet and need something more portable, or you've never touched one but want to learn, iTrump. Visit http://itrump.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]. ABOUT THE INTERFACE iTrump is modeled after the real Trumpet and is designed to allow play purely by touch with maxmium agility and minimum coordination between left and right hand. There's an 'open pad' for left thumb, and three 'valve pads' which correspond to trumpet valves 1, 2, and 3 and drop 2, 1, and 3 half-steps, respectively. The vertical divisions are based on the harmonic series and what you would play if you slurred continuously all the way up or down for a given valve combination. For open, this would be C G C E G (Bb) C, etc. (The Bb partial is currently left out).

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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
react-navigation
redux
expo-av
expo-gesture-handler
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.