App Overview

insTuner - Chromatic Tuner with Tone Generator icon

insTuner - Chromatic Tuner with Tone Generator

Polybeat PTE. LTD. · Music

***Featured on Apple's "New and Noteworthy","New", in US, UK, Australia and many more stores.***

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
226 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 included18 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 insTuner - Chromatic Tuner with Tone Generator: 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 to support more instruments and tunings.

Assumption to check: Limited instrument support.

Validate with people who use this workflow before building.

Hypothesis 2

Implement advanced algorithms for better accuracy.

Assumption to check: Calibration can be inaccurate.

Validate with people who use this workflow before building.

Hypothesis 3

Allow offline tuning features.

Assumption to check: Lack of offline mode.

Validate with people who use this workflow before building.

Hypothesis 4

Add more visual indicators and animations for user engagement.

Assumption to check: Limited visual feedback.

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

***Featured on Apple's "New and Noteworthy","New", in US, UK, Australia and many more stores.*** *** Featured by FWA Mobile "Mobile of the Day" *** insTuner is a chromatic tuner that helps you tune instruments quickly and accurately. It also features a Tone Generator just like a pitch pipe with four different wave forms. With advanced DSP (Digital Signal Processing) algorithm, it is highly accurate (±1/1000 semitone or ±0.1 cent precision). Rather than providing only one mode like other tuners, insTuner supports different tuning modes applicable to different situations, such as Instant Tuning Mode for quick tune and play, Fine and Strobe Modes for accurate tuning, FFT Mode for sound analysis etc. What's more, many advanced features are provided such as Concert A calibration, historical temperaments and transpositions, which make it more powerful than other tuners. insTuner is well-designed and easy to use. It features a unique "fixed" note wheel, which helps you to find the position of detected pitch easily. You can also use it as an electronic pitch pipe to tune by ear, matching the generated tones. It is suitable for tuning acoustic or electric guitar and bass, ukulele, mandolin, banjo, bouzouki, bowed strings, woodwinds, brass, timpani and more. In fact, almost any instrument that sustains a tone can be tuned using insTuner. It supports Built-in Microphone as well as Line-in and other audio interface such as Apogee One. Clip Microphone is supported too. === FEATURES === * Universal App, purchase once, available on all of your iOS devices: iPhone/iPhone5/iPod/iPad. * Supported both Landscape and Portrait mode * Precise to ±1/1000 semitone (±0.1 cent) * Tuning Range from C0 to B8, covering the range of almost all of musical instruments * Instant Tuning Mode * Strobe Tuning Mode * Fine Tuning Mode with a highly responsive tuning meter for perfect tuning * Historical Curve Mode that shows tuning results over time * FFT Tuning Mode for frequency analysis with Log, Linear or Note Display options * Real-time Spectrogram Mode with Log, Linear, Note and Median Frequency Display options for real-time audio analysis * Well-designed "Fixed" note wheel display * Adjustable A4 (Concert A) calibration in 0.1 Hz increments * >30 historical temperaments * Customizable temperaments * 12 notations * Needle damping * Customizable transposition options for transposing instruments * Tone generator with four wave forms * Line-in and Built-in Microphone Modes * Customizable Input Channels * Supported Apogee One * Supported Inter-App Audio * Supported Audio Bus * Optimized for iPhone 6 and iPhone 6 Plus ===About EUMLab=== We make the best music Apps for you! With magic technology, EUMLab provides many products to help you create or learn music. More about us on www.eumlab.com Follow us on Twitter/Facebook @EUMLab Questions? Write to us: [email protected] Watch videos on bit.ly/eumvideo ---------------------------------------------- Our customers said: "Best tuner I've ever had. I'm a professional clarinetist, and I've told all of my musician friends to use this app." "I highly recommend this app and who can beat the price. My violin teacher compared it to her personal device. She wants an ipad to get the app for her personal use. " "I have the iPhone 5 and play tenor sax, I compared this to a 40 dollar tuner and its perfect..." "As a high school band director, I use this tuner more often than my strobo tuner. Besides the obvious portability, it is actually a bit more sensitive than the multi thousand dollar strobo and I Iove the multitude of options!" "Absolutely love this app. I use it for my guitar, my son's violin and upright bass. The new features are even more amazing..." and more… ---------------------------------------------- Enjoy insTuner? Try Pro Metronome for FREE! http://bit.ly/prometronome

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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
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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.