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
Klench: Kegel Trainer
Klench is a simple Kegel and reverse Kegel trainer.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
20 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 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 Klench: Kegel Trainer: 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
Implement smart reminders based on usage patterns.
Assumption to check: Users often forget to log their water intake
Validate with people who use this workflow before building.
Hypothesis 2
Expand drink type selection and allow custom entries.
Assumption to check: Limited drink type options for logging
Validate with people who use this workflow before building.
Hypothesis 3
Add options for users to share their hydration achievements.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate gamification elements like challenges and rewards.
Assumption to check: Lack of motivation 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
Klench is a simple Kegel and reverse Kegel trainer. No long onboarding quizzes. No accounts. No recurring fees. Just open the app, follow the timer, earn XP, and progress over time. CORE FEATURES — 25-Level Progression: Start easy and unlock harder sessions as you build consistency. — Full Kegel + Reverse Kegel Protocol: Train with guided medium, long, and short intervals. — XP-Based Growth: Complete sessions, earn XP, and unlock harder progressions. — Audio & Haptic Cues: Follow each interval discreetly without staring at your screen. — Manual Level Select: Already experienced? Skip ahead to the level that fits you. — Instant Start: Open the app, tap Start Workout, and begin in seconds. — Total Privacy: No account. No tracking. No personal questionnaire. No data collected or sold. WHY KLENCH? Pelvic floor training can support bladder control, core stability, prostate health, and stamina. But building the habit shouldn't require a subscription or a bloated app. Klench gives you the essentials: guided intervals, progress levels, reminders, and privacy — for one lifetime purchase. One purchase. Yours forever. — For educational and wellness purposes only. Not medical advice. Consult a healthcare professional for pelvic pain, urinary symptoms, prostate-related symptoms, or any medical concern.
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
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Zustand
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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.
