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
Pulse by Callanetics
IT’S ALL IN THE PULSE!
$0.99 · In-app purchases
PRICE
$0.99
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 included14 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 Pulse by Callanetics: map the core Sports 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 more diverse workout routines and user-generated content.
Assumption to check: Limited variety of workouts available
Validate with people who use this workflow before building.
Hypothesis 2
Implement detailed analytics and progress visualization.
Assumption to check: Inadequate progress tracking features
Validate with people who use this workflow before building.
Hypothesis 3
Offer clear explanations of subscription benefits and easier management options.
Assumption to check: Subscription model can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social sharing and community forums for user interaction.
Assumption to check: Lack of community features
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
IT’S ALL IN THE PULSE! The perfect companion to your Callanetics workouts. The Callanetics Pulse is a tiny, gentle precise movement that is responsible for the sculpting and toning of the muscles. Each exercise in Callanetics requires a certain number of Pulses to be performed in a set amount of time. Use our Callanetics Pulse counter to correctly time the number of Pulses. Our easy to use app allows you to select 100, 75 or 50 pulses. Simply press the number to select the one you want. The counter will alert you once you have completed your set. There is also a 30-second timer for holding stretches. The Callanetics Pulse counter is perfect for when you are working out without a video or instructor to guide you. It helps ensure you work each side of the body evenly and for an effective length of time. Let our Callanetics Pulse counter handle the counting while you focus on enjoying the wonderful benefits of the exercises.
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
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BUILD KIT DIFFICULTY
Starter
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.
