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
KiraRowing
Rowing is an effective full-body workout
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 KiraRowing: 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
Incorporate social sharing features to share workouts on social media.
Assumption to check: Lack of user engagement features like social sharing
Validate with people who use this workflow before building.
Hypothesis 2
Offer customization of workout types and metrics tracked.
Assumption to check: Limited workout tracking options
Validate with people who use this workflow before building.
Hypothesis 3
Introduce gamification elements to encourage user activity.
Assumption to check: No motivation features like challenges or badges
Validate with people who use this workflow before building.
Hypothesis 4
Enhance charts and graphs for better user insights.
Assumption to check: Insufficient data visualization for progress tracking
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
Rowing is an effective full-body workout. Whether at home or in the gym, rowing improves your health and fitness . KiraRowing supports you in your rowing training. You can create individual training profiles - from simple warm-ups to challenging rowing workouts with varying intensity in the intervals of your training profile. Your workouts are saved in Apple Health. Track your training success through Apple Health or Apple Fitness, whether you complete your training at home or in the gym. If you have paired an Apple Watch with your iPhone, the movement pattern of a rowing cycle is analysed and measured using the sensors of the Apple Watch. Your stroke rate per minute specification serves as a guideline for your training in this case. However, the actual rowing strokes are measured using the Apple Watch. Features: - Individual training profiles - Training with time limit and progress indicator - Interval training - The sensors of your paired Apple Watch track your individual movement pattern (stroke cycle) - Capture heart rate via your paired Apple Watch or alternatively a Bluetooth HR sensor if no Apple Watch is paired with your iPhone - Specify the number of strokes per minute for each interval of your training - Animation of the stroke based on the specified stroke rate - Determination of energy consumption - Importing training data into Apple Health KiraRowing can be used without Apple Watch. In this case, the use of a Bluetooth HR sensor is recommended and the number of strokes is estimated by the stroke rate specification and the duration of the training. KiraRowing can also be used on an iPad, but without Apple Watch support only.
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
Supabase
@react-navigation/native
react-native-svg
zustand
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.
