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
Fluent Stuttering Calculator
"Fluency Calculator - Measurement of Stuttering" provides a measure of the frequency of various types of disfluency occurring in a speech sample.
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.8
6 ratings · Below Average
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 Fluent Stuttering Calculator: map the core Medical workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
"Fluency Calculator - Measurement of Stuttering" provides a measure of the frequency of various types of disfluency occurring in a speech sample. It is designed for Speech and Language Therapists to perform a live count of the number of fluent or disfluent syllables. A parent can also use it to track their children's stuttering severity. App Features: 1. A Stopwatch to track time 2. Two buttons "Syllable" and "Shutter". A live track of the total number of syllables recorded is shown on the main screen as well as the number of fluent and disfluent syllables/words entered. 3. "Fluency Calculator - Measurement of Stuttering" provides the following results: * SPM: Number of Syllables Per Minutes * SWPM: Number of Stuttered Words Per Minutes * %SS: Percentage of Stuttered Syllables 4. A Settings screen: user can customize almost everything: Change button to any colors by Color Picker, vibrate or highlight when touching. 5. Optimize screen for small screens like iPhone 4s, iPhone 5 6. SHAKE to PAUSE without touching button Please send me email co email: [email protected] for any more features you request. I will definitely add it in next upgrades.
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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 features such as progress tracking and personalized reports.
Assumption to check: Limited functionality and features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Focus on improving user experience and fixing bugs.
Assumption to check: Low user rating indicating dissatisfaction
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI/UX design to make it more appealing.
Assumption to check: Could be more engaging and user-friendly
Validate with people who use this workflow before building.
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.
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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.
