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
Tone Pacer Pro
The Tone Pacer Pro
$59.99 · In-app purchases
PRICE
$59.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 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 Tone Pacer Pro: map the core Health & Fitness 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
Include a wider variety of workouts and customization options.
Assumption to check: Limited workout tracking options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement flexible subscription models to lower entry barriers.
Assumption to check: High upfront cost for users
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing and challenges to engage users.
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 4
Enhance app with Apple Watch integration for easier access.
Assumption to check: Minimal integration with smart devices
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
The Tone Pacer Pro The Tone Pacer Pro application is the professional version of the popular Tone Pacer APP. In addition to the exercise coaching applications found in the original Tone Pacer application, the Tone Pacer Pro, includes features designed for use by healthcare professionals, researchers, and people skilled in the application of functional neurology methods. The Pro version, allows the user to manually set frequencies for tone 1 and tone 2 via a pop-up the keypad which allows the user infinite control on the auditory stimulation output for the application. This feature is known as the custom frequency feature. In addition the Pro version features an alternating mode which cycles between ton1 and tone 2. This feature is a compliment to the reciprocating audio stimulation mode found on the original Tone Pacer program. The Pro Version allows for the control of beeps per minute, but has the added feature of continuous tone output. This has potential applications for binaural beat protocols for the entrainment of brain rhythms and may have application for cerebellar cortex stimulation. The Pro Version due to its flexibility also lends itself for notch-like treatment protocols that have been shown to attenuate tinnitus and Stochastic Vestibular Stimulation. The Pro version was design to meet the needs of professionals seeking an application for the generation of acoustical auditory stimulus.
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
Zustand
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react-native-svg
expo-router
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.
