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.
App Overview
Drone Tuner
Drone Tuner is a unique app designed to improve your sense of pitch and your sound
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
40 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Drone Tuner: 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
Introduce more sound types and effects for enhanced user experience.
Assumption to check: Limited sound options for tone generation
Validate with people who use this workflow before building.
Hypothesis 2
Add an onboarding tutorial to guide new users through app features.
Assumption to check: Lack of a comprehensive tutorial
Validate with people who use this workflow before building.
Hypothesis 3
Improve UI scaling for different device sizes.
Assumption to check: Inconsistent UI responsiveness
Validate with people who use this workflow before building.
Hypothesis 4
Implement a library feature to save and categorize multiple frequency settings.
Assumption to check: Difficulty in saving multiple frequency settings
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
Drone Tuner is a unique app designed to improve your sense of pitch and your sound. It features beautiful drone performances from professional orchestral musicians, as well as a gorgeous and revolutionary visualization that allows you to visualize your place within a chord! This tuner has the following unique features: 1. It has recordings from professional musicians playing long tones List of instrument sounds: Alto Sax Bass Clarinet Bassoon Cello Clarinet English Horn Flute French Horn Guitar Oboe Piano Tenor Sax Trombone Trumpet Tuba Upright Bass Ukelele Viola Violin 2. It incorporates a revolutionary visualization that allows you to simultaneously work on your tuning AND your sound quality. With this visual aid you can also tune yourself within a chord! 3. Drone tuner is the fastest digital tuner for iOS. Instead of detecting your pitch, it uses incoming sound to produce an interference pattern that indicates your harmonic relation to the selected root note in real time. The result is faster and more accurate than other digital tuner. You will see, and feel the difference. For more information, please visit our website! www.drone-tuner.com
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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
expo-status-bar
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.
