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.
the track day lap-timer by track day riders, for track day riders (and drivers!)
$4.99 · 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 TrackDay for iPhone: map the core Sports 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 functionality for tracking advanced metrics.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inadequate social sharing options.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization for session settings.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No integration with external devices (smartwatches, etc.).
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.
the track day lap-timer by track day riders, for track day riders (and drivers!) the customer feedback about racing leathers interfering with the gps signal is correct! you *must* mount your iphone externally to capture a good gps signal while *riding* at the track. details are provided on the gps accuracy screen accessed via the support & feedback menu selection. - capture gps data, then automatically compute lap times for each of your sessions on the track. - download our tracks ($0.99 each), or (with $2.99 in-app purchase) have the app "learn" the track from your session data. - with track view, analyze the raceline before you head out onto the track; back in the paddock, analyze your session results. - with the dashboard view, lap times and sector times are displayed in real-time; back in the paddock, analyze lap and sector times across sessions. - 270+ track configurations around the world and counting! don't see the track you're looking for? tell us and we'll add it!! here are just a few of the tracks we feature: anglesey international aragon arizona motorsports park arroyo seco raceway auto club speedway autobahn country club autodromo fazenda capuava autodromo jose carlos pace (interlagos) bir barbagallo raceway barber motorsports park baskerville raceway bedford autodrome blackhawk farms raceway brands hatch brno circuit bugatti circuit buttonwillow raceway cadwell park carolina motorsports park castle combe circuit charlotte motor speedway road course chuckwalla valley raceway circuit mont-tremblant circuit de catalunya circuit de valencia circuit de la sarthe circuit of the americas circuito estoril circuito de jerez daytona international speedway donington park dubai autodrome eagles canyon raceway firebird international raceway gateway motorsports park gingerman raceway goodwood circuit grattan raceway harris hill road heartland park topeka homestead-miami speedway road course honda grand prix of st. petersburg iowa speedway road course isle of man tt jennings gp kirkistown circuit kyalami grand prix circuit las vegas motor speedway lime rock park losail international circuit msr houston mallory park superbike circuit manfeild autocourse mazda raceway laguna seca mid-america motorplex mid-ohio sports car course miller motorsports park misano world circuit monticello motor club motorsport park hastings motorsports ranch cresson mount panorama circuit bathurst mugello circuit nccar / ncbike njmp nola motorsports park nashville superspeedway road course nelson ledges road course new hampshire motor speedway road course nuerburgring nordschleife and f1 circuit oulton park circuit pacific raceway road course palm beach international raceway phakisa freeway f1 track phillip island grand prix circuit pittrace (beaverun) north track pocono raceway portland international raceway pukekohe park raceway putnam park road course qld raceway red star raceway road america road atlanta rockingham motor speedway road course roebling road raceway ruapuna park grand prix circuit sachsenring circuit sebring international raceway sentul international circuit sepang international circuit serres racing circuit silverstone circuit snetterton sonoma raceway spring mountain 2.2 summit point motorsports park suzuka circuit sydney motorsports park symmons plains raceway tt circuit assen talladega gran prix raceway taupo motorsport park teretonga park raceway texas world speedway thunderhill raceway park timaru international motor raceway (levels) twin ring motegi vir vereeniging kart circuit wakefield park watkins glen international willow springs winton motor raceway yas marina circuit zwartkops raceway and kart circuit continued use of gps running in the background can dramatically decrease battery life. all third-party names mentioned by the ftlapps website and trackday apps are trademarks of their respective owners and subject to applicable laws.
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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.