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
Step Aerobics Fitness
Step aerobics is a great and simple way to get and stay fit
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
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 included17 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 Step Aerobics Fitness: 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 a wider range of workouts and routines.
Assumption to check: Limited workout variety leading to user boredom
Validate with people who use this workflow before building.
Hypothesis 2
Focus on building a robust and bug-free user experience.
Assumption to check: Poor user reviews indicating functionality issues
Validate with people who use this workflow before building.
Hypothesis 3
Add features such as user profiles, sharing workouts, and community challenges.
Assumption to check: Lack of social features for community engagement
Validate with people who use this workflow before building.
Hypothesis 4
Offer a value-driven free tier with optional paid features.
Assumption to check: In-app purchase model may deter users
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
Step aerobics is a great and simple way to get and stay fit. Minimal room is required so these exercises can be carried out easily at home. The exercises are fun and easy to learn. This app has 260 tuitional video lessons that will soon get you in shape! Lessons include Basic Step Aerobics Workout Routines Combination Move In Basic Step Aerobics Basic Step Aerobics Workout Routines Hop Turn Move In Step Aerobics Basic Step Aerobics Workout Routines Quick Step Move In Step Aerobics Basic Step Aerobics Workout Routines Basic T Step Move In Step Aerobics Basic Step Aerobics Workout Routines Basic L Step Move In Step Aerobics Basic Step Aerobics Workout Routines Step Routine Twelve Move In Basic Step Aerobics How To Do Low High Impact Aerobic Exercises Side Step High Low Impact Aerobic Exercises How To Do Low High Impact Aerobic Exercises Around The World High Low Impact Aerobic Exercises How To Do Low High Impact Aerobic Exercises Jogging For High Low Impact Aerobic Exercise Learn Floor Aerobics To 80s Music Warming Up For Aerobics To 80s Music Learn Floor Aerobics To 80s Music The Grapevine For Aerobics To 80s Music Learn Floor Aerobics To 80s Music The Pony For Aerobics To 80s Music Learn Floor Aerobics To 80s Music Rock Left Rock Right For Aerobics To 80s Music Learn Floor Aerobics To 80s Music Stretching For Aerobics To 80s Music How To Do Aerobic Exercises Doing Warm Up Aerobic Exercises Aerobic Dance Step Showdown Self Learning Aerobic Dance Step Aerobics Made Easy Easy Aerobics Aerobic Exercise Aerobic Course - Aerobics Shiny Legs Raffaella Salemi Pump Up Telemuoviti - Aerobica 1 Raffaella Salemi Pump Up Telemuoviti - Esercizi Per Spalle Raffaella Salemi Pump Up Telemuoviti - Riscaldamento 1 Raffaella Salemi-3 Minuti Con Pump Up - Gluteo 45 In Piedi Raffaella Salemi Pump Up Telemuoviti - Esercizi Per Dorsali Raffaella Salemi - 3 Minuti Con Pump Up - Tricipite 1 Step Aerobics - Shared Step Step Aerobics - April 2007 Step Aerobics With My Extreme Stepaholics Step Aerobicsmulti-Step Breakdown Combo 4 Extreme Steppers 060607 Step Aerobics - Shared Step 2 Izetts Xtreme Step Demowwwxtremestepcom Keli Roberts Step It Strong Cardio Step Express Cardio Kick Step Boxing Kelly Coffey-Meyer Hi-Lo Cardio Christi Taylor Ultimate Cardio Core Workout Christi Taylor Totally Hot Cardio Best Aerobic Music 2009 - 35 Hot Hard Workout Step Dance Aerobic 1 Step Aerobics - Celebration Sebastian Piatek On Stage Basic Step Aerobics Workout Routines Cut The Corner Move In Step Aerobics Basic Step Aerobics Workout Routines Step Routine Eight Move In Basic Step Aerobics Basic Step Aerobics Workout Routines Step Routine Fourteen Move In Basic Step Aerobics Basic Step Aerobics Workout Routines Step Routine Five Move In Step Aerobics Basic Step Aerobics Workout Routines 32 Count Combination Move In Basic Step Aerobics Basic Step Aerobics Workout Routines Karaoke Move In Step Aerobics Basic Step Aerobics Workout Routines Step Routine Thirteen Move In Basic Step Aerobics Basic Step Aerobics Workout Routines Mambo Cha Cha Move In Step Aerobics Basic Step Aerobics Workout Routines Reverse Turn Move In Step Aerobics Basic Step Aerobics Workout Routines Step Routine Nine Move In Basic Step Aerobics Basic Step Aerobics Workout Routines Mambo Move In Step Aerobics Basic Step Aerobics Workout Routines Step Routine Seven Move In Step Aerobics Basic Step Aerobics Workout Routines Basic Stomp Move In Step Aerobics Basic Step Aerobics Workout Routines Step Routine Ten Move In Basic Step Aerobics Basic Step Aerobics Workout Routines Mambo Variation One Move In Step Aerobics Basic Step Aerobics Workout Routines Shuffle Box Step Move In Step Aerobics and many more!
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
Axios
Victory Native
React Navigation
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.
