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.
SizeMyBike is the first iPhone bike fitting app
$2.99 · 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 SizeMyBike: 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 user engagement due to lack of community features
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user ratings due to unclear sizing guidance
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchase confusion
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.
SizeMyBike is the first iPhone bike fitting app. Essential to choose the right bike size and improve your position! Define your morphology with 6 body measures and SizeMyBike will compute the optimal geometry of your road bike or your mountain bike. Easy, fast and efficient! The right fit is everything. SizeMyBike will help you dial in the perfect fit, to give you the absolute best comfort and performance. PRESS QUOTES “While it certainly won’t replace a proper bike fitting session at your local bike shop, the SizeMyBike app is a great place to start. The program asks you to input six body size measurements and then produces two extremely detailed sets of bike specifications.” Canadian Cycling, February 2011 “With SizeMyBike, the beginners will be able to choose the right bike size at the time of the purchase. Expert riders should use it to check if their current geometry is optimal. RATE 8/10.” CycloPassion, num 199, July 2010 “A quick test confirmed that dimensions were correct for a Mountain Bike.” O2BIKERS, Num 159, May 2010 TOP FEATURES - Fit your road bike as you ride: comfort, performance or urban - Fit your MTB as you ride: Xcountry, All Mountain or 29er - Multiple users management - Export results to PDF file - Save your riders database safely: import/export on your computer FEATURES 1) DEFINE YOUR MORPHOLOGY Define your morphology with 6 body measures: inseam, height, torso, shoulder, arms and foot. Entering the measurements is easy and straight forward. WARNING SizeMyBike algorithms rely on scientific papers and studies validated. SizeMyBike was tested by international well known cycling magazines such as Le Cycle, Canadian Cycling Magazine, CycloPassion, 02Bikers. All testers confirmed SizeMyBike accuracy. Keep in mind that taking your body measurements accurately is essential.Fitting errors result from inaccurate body measurements. Please examine carefully the help section in relation with this topic. 2) ROAD BIKE FITTING Three kind of bike fitting are available for road cycling: comfort, performance and urban. The seat tube length and the top tube length should allow to choose the right bicycle size. The saddle height, saddle setback and crank length should allow to optimize power and efficiency. Stem height and stem length should allow to optimize comfort and aerodynamic. 3) MOUNTAIN BIKE FITTING Three kinds of bikes are available for MTB: Xcountry, All Mountain or 29er. The frame size and the top-tube length should allow to choose the right bicycle size. The optimal saddle height, the crank length and the stem length are also computed. 4) SAVE DATA Multi-user environment allows you to back up mates data & yours. Save your data safely: import or export your riders database on your computer using iTunes. 5) SHARE RESULTS Share your bike measurement well fitted by SizeMyBike by email (PDF file). You can print wirelessly SizeMyBike results from your iPhone via AirPrint. You can also save the result on your computer via iTunes. Keep in mind that professional bike fitting service costs about $150. If you like SizeMyBike, please rate it 5-stars in iTunes every time an update comes out! Follow us on Twitter or facebook for updates and development news. Please feel free to contact us through our website. Feedback helps us to improve SizeMyBike.
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.