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.
CalcFinals is a simple, clean final grade calculator designed to help students quickly understand what score they need on a final exam to reach their goal in a class.
$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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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 CalcFinals: map the core Education 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 for advanced calculations
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Simple UI design
Validate with people who use this workflow before building.
Hypothesis 4
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.
CalcFinals is a simple, clean final grade calculator designed to help students quickly understand what score they need on a final exam to reach their goal in a class. Whether you are trying to keep an A, raise your grade, pass a class, or just see how much your final exam matters, CalcFinals gives you a clear answer in seconds. Enter your current class grade, your desired final grade, and the percentage weight of your final exam. CalcFinals will calculate the exact score you need on the final to reach your target grade. Features: • Calculate the score needed on a final exam • Enter your current grade, goal grade, and final exam weight • Customize class names to keep your classes organized • Add as many classes as you need • Save your entered information so you can come back later • Pick up where you left off during finals week • Track multiple classes while preparing for exams • Use quick goals to test common targets faster • Try different “what-if” grade scenarios • See whether your goal is realistic based on the final’s weight • Dark Mode support • Clean, simple design with no unnecessary clutter • Fast and easy to use during finals week • Helpful for middle school, high school, and college students • No account required • No ads • No subscriptions CalcFinals is built for students who want a quick, straightforward way to plan for finals. Instead of guessing how much your final exam will affect your grade, CalcFinals helps you see the numbers clearly. Use CalcFinals to answer questions like: • What do I need on my final to get an A? • Can I still pass the class? • How much will my final exam affect my grade? • What happens if I score higher or lower than expected? • Is my target grade still possible? • What should I focus on during finals week? CalcFinals keeps the process simple: add your classes, customize their names, enter your grades, choose your goal, and calculate your result. Your information is saved, so you can return later and continue planning without starting over. Perfect for finals week, end-of-semester planning, and quick grade checks throughout the school year — with no ads, no subscriptions, and no unnecessary distractions.
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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.