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.
Tell the app how your kart behaves through a corner and it tells you what to change on the chassis
$7.99
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.
Kit ready. Verify your email to download it.
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.
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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.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Tell the app how your kart behaves through a corner and it tells you what to change on the chassis. No guessing, no forums, no depending on somebody in the pit having a good day. HOW IT WORKS You pick the symptom — understeer, oversteer, hopping, sliding on all four — where it happens (corner entry or exit) and how strongly you feel it. The app crosses that with your pressures, your temperatures and the conditions of the day, and gives you a list of adjustments ordered by priority: where to start, what is worth trying and what to do if it persists. Every piece of advice comes with its explanation and its illustrations. It is not a black box: you can see why it suggests each thing. COLD TARGET PRESSURE The rest of the app analyses what you already measured. This screen answers the opposite question: what do I set cold BEFORE going out so the session ends inside the tyre's window. It accounts for the compound, air and track temperature, track condition, grip and total weight, and shows you the breakdown of what moved the number. 31 compounds from MG, Bridgestone, Vega, LeCont, MOJO, Maxxis, Evinco, Komet and Hoosier, plus generics by hardness for when yours is not listed. THE NOTEBOOK It saves every session with its pressures, temperatures, conditions, tyre and the advice you were given. Add the laps and your best time: it is the only thing that really tells you whether the setup worked. With two or three sessions saved you can already compare. You can keep several karts. And share a whole session as an image, ready to send over WhatsApp, which is what already happens in every pit. CATALOGUES 142 circuits from 24 countries, with length, layout type and abrasiveness. 33 chassis models from 11 manufacturers. And if yours is not there, you type it in and it is saved all the same. CALCULATORS Gear ratio, with the theoretical top speed of each combination and how much one sprocket tooth moves things compared to one on the rear. And air density, to know how far today is from the day the engine ran perfectly. MEASURED YOUR WAY PSI or bar, Celsius or Fahrenheit, kilos or pounds. You switch from the screen itself and whatever you already measured is converted. HELP ON EVERY SCREEN Every screen has its own help, written by someone who has taken tyre temperatures in a paddock: how you actually measure, what mistakes people make and what each number means. HONEST ABOUT ITS DATA The pressure windows come from tuner guides, distributors and the specialist press. When a figure is not confirmed, the app says so. It does not sell you certainty it does not have. One-off purchase. No subscription, no ads, no account. Works with no signal, which is how most paddocks are.
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.