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.
Box 4 Fitness - Heavy Bag Workout is a Fitness app that gives the most incredible workout with your own pro boxing coach
$2.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Heavy Bag Workout: 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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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
Assumption to check: Limited exercise variety compared to other fitness apps
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No community features for motivation
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lacks detailed progress tracking
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No integration with health data platforms
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Box 4 Fitness - Heavy Bag Workout is a Fitness app that gives the most incredible workout with your own pro boxing coach. Get lean, toned and strong whilst boxing your way from Novice to Pro!! The app provides: - detailed instructions and AUDIO COACHING 100% along the way, even between rounds!! - the ability to punch along to the punching combos while listening to your favorite workout tracks You get all this in the palm of your hand and your own professional boxing coach, Rick Sweeny, in your ear to keep you motivated, keep you improving your skills and to give you an overall body workout that is unbeatable! Workout routines: - Single round workouts (2 and 3 minutes) - you punch along to the punches called out by your coach - multi round workouts, up to 10 round workouts where you get to control how long your rests are (30 or 60 seconds) and how long the rounds are (2 or 3 mins). Work all your way up to a 10 round workout with 3 minute rounds and 30 second break for the ultimate workout!!!! Works great with your music library: the app cleverly balances the volume between the coaching and your music - the perfect balance that will keep you motivated round after round!! Benefits of Heavy Bag Training: 1. Improve Body Shape 2. Improve Aerobic Fitness 3. Improve Power 4. Improve Coordination & Core Stability 5. Develop Self Defense Skills 6. Decrease Stress 7. Low cost - just the bag, wraps and gloves for your hands and this app! Who's Rick Sweeney? Your personal coach, Rick Sweeney, was born June 8, 1959. He boxed as an amateur from 1982-1986, with a 10-2 record. He was Adirondack Golden Gloves champion at 152 lbs. in 1985. Rick became a professional in 1986 with a 2-0 record, before opening Sweeney’s Boxing in 1994. He’s been vice president of amateur boxing in the Adirondack region since 2004. He’s a professional and amateur boxing trainer, cut man, and promoter, as well as a fitness and weight loss trainer. Rick has trained such fighters as Frank Houghtaling when he won the IBC America’s title and New York State’s junior middle-weight title, and Teresa Perozzi when she won the NABC women’s world title in Bermuda and defended it in Sweden. He’s worked the corner in 7 title fights, and he’s the trainer of former WIBC Light Welterweight champ Sarah Kuhn.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.