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.
Heavy Loads - Plate Calculator:
$0.99 · 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 Loads - Plate Calculator: 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 features and functionality compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent user experience with UI elements
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of user engagement features
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.
Heavy Loads - Plate Calculator: Whether you’re chasing PRs, training for a meet, or just need fast and accurate plate math, Heavy Loads helps you load the bar with confidence. Designed for lifters, by lifters, this streamlined calculator ensures your barbell is always loaded correctly—no more guesswork, mental math, or second-guessing your plates. 3 POWERFUL LOADING MODES: 1. AUTO CALCULATION MODE Set your target weight, and Bars N Plates calculates the optimal plate combination based on your customized inventory. Add or remove plates in your collection and the app will always find the best match using the plates you actually own—no unnecessary math, no missing weights. 2. PERCENTAGE BASED MODE Perfect for programming and progressive overload. Set a base weight (like your training max or 1RM) and instantly calculate common percentage targets like 60%, 75%, 90%, or any custom value. The app handles the plate math so you can stay focused on training. 3. MANUAL (REVERSE) MODE See a bar already loaded and want to know what it weighs? Use Manual Mode to add plates in any order—just like they’re on the bar—and Heavy Loads instantly calculates the total barbell weight. Great for coaches, training partners, or quick checks at the gym. KEY FEATURES • Custom Barbell Support: Create and select from multiple barbells, each with their own weight and name—ideal for switching between women’s, men’s, youth, or specialty bars. You can even assign a custom color to each bar to keep them visually distinct on screen. • Unit Conversion at a Glance: Lift in kilograms but stuck with lb plates? No problem. Heavy Loads displays both units at once—your primary unit in large text, and the secondary unit in smaller text. You’ll always know how much you’re lifting, no matter the gear. • Fully Customizable Inventory: Add, remove, and reorder the plates you actually own. From calibrated competition sets to budget bumper plates, you decide what’s available, and the app calculates accordingly. • Clean, Minimal UI: No clutter, no distractions. Built with focus and clarity in mind, Heavy Loads gives you the info you need, right when you need it. • Fast Switching Between Modes: Toggle between loading strategies with a tap—whether you’re preparing for your next working set or reviewing your last lift. • Supports Both Sides Loading: All calculations are done with per-side logic in mind, so what you see is what you load. Heavy Loads is designed for powerlifters, Olympic weightlifters, CrossFit athletes, strength coaches, and anyone serious about barbell training. Whether you’re in your home gym or the weight room at your local gym, Heavy Loads makes it easier to focus on what matters: lifting heavy, with precision.
Written user reviews are not shown here. Check current App Store reviews >
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.