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.
This is the same app as the popular "SprintTimer - Photo Finish" with the only difference that you pay for the additional Pro functionality up front instead of through a yearly subscription.
$24.99 · 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 SprintTimer Pro: 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 tracking features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High cost compared to similar apps
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface may feel dated
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social sharing 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.
This is the same app as the popular "SprintTimer - Photo Finish" with the only difference that you pay for the additional Pro functionality up front instead of through a yearly subscription. SprintTimer is a unique sports timer and photo finish app that employs the same techniques as the fully automatic timing equipment (FAT) used at the Olympics. Start the timer and point the camera towards the finish line. The app creates an image where you can scroll to get the time for each competitor with a 0.01 s accuracy*. SprintTimer also includes a motion-activated Video Finish for longer races and a Start Sender for wirelessly controlling SprintTimer from another device. SprintTimer is used by coaches, teachers, and athletes all over the world for practice and competition in, for example, track & field, cycling, skiing, speed skating, car racing, rowing, kayaking, horses or greyhound racing. SprintTimer has several advantages over a manual stopwatch: - One person can time all participants - Higher accuracy* - Easier to determine the order - The image and the results can be saved - Can operate "hands-free" when started - The timer can be started manually, with a sound, or remotely from another device *sprinttimer.app/accuracy ——— Reviews and Comments ——— "Without a doubt the best App available on the market for sprinters and coaches who want accurate timing to see their development." speedendurance.com "AMAZING" thepegeek.com "Amazing app for physical education teachers or coaches! I have used it for timing during our track and field, speed quickness & agility, fitness testing, & many more units. It is very accurate and easy to use and gets the job done quickly! A must-have!" mertonphysed.weebly.com "The app is very professionally set up and you can very easily capture your whole Track event." www.melhamada.com "Very useful app for measuring and/or verifying close finishes to track and field or road races." physedreview.weebly.com Satisfied users from all over the world: - Brilliant. A fantastic app for use in school athletics lessons - Amazing. This application is awesome and the results are really accurate. - What a brilliant app! Our £9k photo finish camera broke down and this app was a real lifesaver and worth way more than £1.50! Highly recommended. - This app is wonderful. We use it to time all our meets. - This is a great app and it is getting better from release to release - Nice, nice, nice! Using it for our youth track team. Love it! 5 stars! - Exactly what I needed - Fantastic app - Thank you so much for developing this amazing app just when we ran out of options. - Congratulations on developing a really clever and useful app. - Love what you did with the SprintTimer app. Terms and Privacy Policy: https://sprinttimer.se/privacy Icon runners made by Freepik from Flaticon.com
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.