App Overview

KQ Sampei 26 icon

KQ Sampei 26

Ryouta Kira · Music

kq sampei is a powerful sampler synthesizer for ios that allows you to load and switch sound sets with ease

$9.99 · In-app purchases

PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
2 ratings · Top 5%

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 KQ Sampei 26: 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 with user-generated content and collaborations.

Assumption to check: Limited song selection for practice

Validate with people who use this workflow before building.

Hypothesis 2

Add social sharing and collaborative practice options.

Assumption to check: No social features to connect with friends

Validate with people who use this workflow before building.

Hypothesis 3

Introduce tiered pricing and one-time purchase options.

Assumption to check: High subscription cost for some users

Validate with people who use this workflow before building.

Hypothesis 4

Implement more detailed analytics to track improvement.

Assumption to check: Lack of feedback on progress

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

kq sampei is a powerful sampler synthesizer for ios that allows you to load and switch sound sets with ease. it supports multi-timbral operation across multiple midi channels, giving you rich flexibility for music production and live performance. key features - supports soundfont (sf2), compressed soundfont (sf3), and downloadable sound (dls) formats - multi-timbral operation across multiple midi channels with high polyphony depending on device performance - compatible with gm, gs, xg, and mpe midi message sets - plays standard midi files (smf) and riff midi files with multiple ports and loop support - auv3 for use with garageband, aum, cubasis, and other apps - micro-tuning with anamark tun files for alternate tuning systems - load on demand / streaming mode for handling large sound sets beyond device ram limits - supports external and virtual midi connections - includes “generaluser gs v1.471” sound set with prepared modifiers - no user data collection beyond what ios/ipados inherently collects perfect for - midi/dtm users who want to play old smf/gs/xg files - musicians using soundfont or dls libraries - mobile producers looking for a plugin synth with deep customization - users needing micro-tuning or alternate temperament support tips - for best compatibility with other soundfont players, use engine v3 and disable custom gs controllers, slow lpf, and smooth volume level. - with large sound sets, streaming mode is recommended. machine generated text is included in this application and description.

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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.

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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.