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.
***Validation published on the Journal of Applied Biomechanics***
$14.99 · 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 Runmatic: 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 social features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High subscription price compared to similar apps
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization in training plans
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Occasional bugs in tracking accuracy
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.
***Validation published on the Journal of Applied Biomechanics*** We know you love running, but do you know how do you run? Designed by sport scientists & coaches of elite runners, Runmatic is the first scientifically designed app that analyzes your running and sprinting technique to help you to improve your performance and prevent injuries. Runmatic takes advance of the slowmotion recording capabilities of your iOS devices to accurately analyze your running and sprinting technique. Using scientifically validation equations, Runmatic calculates the contact-flight times, force, efficiency, frequency and even the asymmetry of your legs in a simple, accurate way. Runmatic can also analyze your stride informing about relevant variables such as pronation, pelvic drop or strike pattern, which could help you prevent injuries. Runmatic is an extraordinary tool for sprint analysis as well. It can measure total time, splits and contact/flight times with a precision comparable to professional timing gates. Moreover, it can create Kinograms (following the methodology by ALTIS) to analyze the quality of motion of each phase of the sprint. You can even calculate the most relevant angles of your body! ****Pr. Jean-Benoit Morin, PhD, Expert in running biomechanics: "This is a very useful app to evaluate and monitor the mechanics of the runners' strides. It's accurate, it's scientifically validated and it uses equations derived from our research (Morin et al., 2005). The tools often used to perform this kind of analyses are much more expensive and generally less practical for the general population. Runmatic solves this problem and allows runners to analyze and monitor their running mechanics in an easy way" ****Arturo Casado, Olympic runner, 2010 European 1500m Champion: "Runmatic is very helpful for my training. It let me better understand how do I run, which is critical to improve my running economy and, therefore, my performance. Is like a lab in my pocket!" Runmatic has a lot of great features that will help you monitor your running and sprinting performance in a very simple, yet powerful way: -Calculate contact time, flight time, frequency, max force, displacement of the center of mass and leg stiffness with scientific accuracy -Analyze your stride to calculate your pelvic drop, pronation and strike patter, which could help you prevent injuries. -Measure total time, splits and contact and flight times of your sprints. -Analyze the quality of the sprint by creating Kinograms (ALTIS methodology). -Multi-user: create as many users as you want -iCloud sync (iOS13 only) -Progress analysis: save as many runs as you want and see your progress through time to check if you have improved or worsened your performance. You can even see the percent of change from one test to another! -Data export: export your whole database to a csv file and play with your data in Excel! -Universal app: purchase once and install it on your iPhone, iPad or Mac (10.15+) Runmatic, analyze your running/sprinting mechanics and improve your performance!
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.