App Overview

OnPitch - Vocal Pitch Monitor icon

OnPitch - Vocal Pitch Monitor

Alena Kucharenka · Music

“OnPitch is a new way for singers to track their pitch, with a stylish and informative interface.”

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.5
519 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 included15 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 OnPitch - Vocal Pitch Monitor: 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

Provide more functionality in the free tier to attract users.

Assumption to check: Limited features in the free version.

Validate with people who use this workflow before building.

Hypothesis 2

Simplify the subscription process and clearly communicate benefits.

Assumption to check: Confusing subscription model.

Validate with people who use this workflow before building.

Hypothesis 3

Offer detailed analytics and feedback to enhance user experience.

Assumption to check: Not enough analytics for users.

Validate with people who use this workflow before building.

Hypothesis 4

Improve audio input handling for better accuracy.

Assumption to check: Occasional audio input issues.

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

“OnPitch is a new way for singers to track their pitch, with a stylish and informative interface.” — discchord.com See exactly what your voice is doing, note by note. Open the app and sing: OnPitch shows the notes you are singing, whether you are on pitch, sharp or flat, and by how much. Use it while practicing scales, songs, sustained notes or vocal exercises. See your pitch as it happens, review the shape of each note, and notice vibrato, pitch drifts and tuning accuracy more clearly. ◆ SIMPLE AND EASY TO USE • No need to record anything — just open the app and sing • See at a glance whether you are on pitch, sharp or flat • View how many cents above or below the note you are singing • Switch between sharp and flat note names • Listen to background music through headphones while using OnPitch ◆ REVIEW YOUR NOTES • See the notes in a musical phrase laid out visually • Tap any note to see its average pitch • Examine how steadily you held a note • See vibrato and pitch drifts over time ◆ REAL-TIME PITCH DETECTION • Notes covered: C0–B8 • Displays note names, cents and exact pitch frequency in Hz ◆ UNIVERSAL APP • Works on iPhone and iPad • Supports Portrait and Landscape orientations Please note: OnPitch is designed for visual pitch tracking. It does not play reference pitches and does not include karaoke tracks, sample songs or vocal exercises. ◆ MICROPHONE ACCESS OnPitch requests access to your device’s microphone in order to detect pitch and display the notes you sing. Without microphone access, pitch detection will not work. You can enable or disable microphone access at any time in your device’s Settings.

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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
React Navigation
Expo-AV
React-Native-Reanimated
BUILD KIT DIFFICULTY
Intermediate

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.