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
5BX
The 5BX App is the easiest way to track 5BX workouts - the classic fitness plan originally developed for the Royal Canadian Air Force
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
43 ratings · Top 30%
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 5BX: 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
Introduce user-generated workouts and templates.
Assumption to check: Limited workout variety and customization options.
Validate with people who use this workflow before building.
Hypothesis 2
Add social features to challenge friends.
Assumption to check: No social features for sharing progress.
Validate with people who use this workflow before building.
Hypothesis 3
Offer more free content or a freemium model.
Assumption to check: Paywall may deter users after initial workouts.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with HealthKit and Google Fit for tracking.
Assumption to check: Lack of integration with health tracking devices.
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
The 5BX App is the easiest way to track 5BX workouts - the classic fitness plan originally developed for the Royal Canadian Air Force. Fully supports the 5BX Plan. 6 charts, 12 levels per chart, 11 minutes a day. Perfect for exercising at home, no equipment needed! Beautifully designed and easy to use while you workout - just tap a single button to control. And with audio prompts, it’s better than ever. Whether you are a seasoned 5BX exerciser or just starting out, this app is a great way to track your progress. Here's what some 5BX App users say: ◈ "This app is so well designed. Clean and functional." ◈ "Now there's this app, which makes it so much easier. Worth x3 the price." ◈ "... this App is a perfect guide/log. The App is intuitive, works well, and is easy to follow." ◈ "A big thanks to the developer for putting this together!" ◈ "I love the app" ◈ "I wanted a straightforward app to step me through the 5BX program every day. This does that" ◈ "Easy, simple. Audio queues are really helpful. Thxs" Easy to Use ◇ Single button to step through exercises ◇ Hear an optional voice prompt or chime at start of each exercise and rep ◇ Tracks your chart & level progress ◇ Follows 5BX Plan recommended progression rate for age ◇ Beautifully designed with a clean, intuitive user interface ◇ Created by a seasoned 5BX exerciser Features ◇ Animated exercise graphics with rep counts clearly displayed ◇ Voice prompt or chime at the start of exercises and reps ◇ Progress bars show where you are in each exercise ◇ Timer displays your elapsed exercise time ◇ Statistics of your exercise days and times ◇ Interactive guide shows you how to use the app step-by-step Settings ◇ Exercise 5 Walk, Run or Stationary Run ◇ Automatically adjust progression rate according to age ◇ Automatically go to next level and chart when current level completed ◇ Hear a voice prompt or chime at start of each exercise and rep ◇ Display exercise 5 Walk or Run distance as (km) or (miles) ◇ Flying Crew increases recommended chart level for some age groups
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/supabase-js
zustand
react-native-reanimated
expo-router
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.
