App Overview

SizeMyBike icon

SizeMyBike

La Pomme Chez Vous · Sports

SizeMyBike is the first iPhone bike fitting app

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
2.5
10 ratings · Below Average

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.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

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.

Screen plan

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.

Differentiate and validate

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
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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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

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

Add social sharing and community feedback options.

Assumption to check: Limited user engagement due to lack of community features

Validate with people who use this workflow before building.

Hypothesis 2

Provide detailed tutorials and visual guides for users.

Assumption to check: Poor user ratings due to unclear sizing guidance

Validate with people who use this workflow before building.

Hypothesis 3

Simplify the paywall and clearly communicate premium features.

Assumption to check: In-app purchase confusion

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

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.

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
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BUILD KIT DIFFICULTY
Starter

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.