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
Vocular
How deep is your voice? Do you have an undulating pitch or a low monotone? Our algorithm analyses your voice and compares it with data from over 150 celebrities to let you understand your voice and learn how to improve it.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
492 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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/
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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.
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 Vocular: map the core Lifestyle 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
Add editing tools like trimming and merging recordings.
Assumption to check: Limited editing features for recordings
Validate with people who use this workflow before building.
Hypothesis 2
Simplify sharing to social media and messaging apps.
Assumption to check: Difficult sharing options
Validate with people who use this workflow before building.
Hypothesis 3
Implement cloud backup to save recordings.
Assumption to check: No cloud backup
Validate with people who use this workflow before building.
Hypothesis 4
Improve audio playback quality and buffering.
Assumption to check: Inconsistent playback quality
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
How deep is your voice? Do you have an undulating pitch or a low monotone? Our algorithm analyses your voice and compares it with data from over 150 celebrities to let you understand your voice and learn how to improve it. The Standard version of the app gives you a full analysis of your voice in terms of depth and variety and calculates a set of celebrity matches to give you a grounding of what your results mean. The Pro version helps you improve your voice. Currently this includes an on-the-fly pitch tracker - so you can practise different ways of speaking and immediately see their effect - as well as unlimited archive space, celebrity comparison graphs, and a charting tool so you can track your progress over time. We’re working to expand Vocular to other areas too. We want to cover things like smoothness, nasality, vocal fry, even creating a rating of how attractive your voice currently is, based on the latest research. If you want to get the most out of your vocal chords, this is the app for you.
Written user reviews are not shown here. Check current App Store reviews >
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/native
@react-native-async-storage/async-storage
expo-av
Zustand
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.
