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.
App Overview
Treadmill Smart Speed
Treadmill Smart Speed is design to communicate your Treadmill Running Speed from you iPhone or Watch to a receiving devices
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.3
24 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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Combine features and design from your favorite apps.
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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.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Treadmill Smart Speed: map the core Health & Fitness 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
Include more detailed stats and progress tracking.
Assumption to check: Limited workout tracking features
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more modern and visually appealing design.
Assumption to check: Poor user interface design
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation for a better user experience.
Assumption to check: Confusing navigation structure
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing and challenges to engage users.
Assumption to check: Lack of social features
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
Treadmill Smart Speed is design to communicate your Treadmill Running Speed from you iPhone or Watch to a receiving devices. It used the same Bluetooth communications protocols as expensive running footpods. You choose your preferred Speed Input: 1 - Select the speed your treadmill is moving on the app and this is transmitted via bluetooth to your receiver. (This is my personal recommendation) 2 - Attach the iPhone security to yourself and run. The iPhone's motion sensor will estimate your speed and transmit this to your bluetooth receiver. ****** iPhone 5S and above. ***** (fully dependant on accuracy of iPhone) *****THIS OPTION WILL BE DISCONTINUED IN FUTURE VERSIONS, PLEASE RELY ON TREADMILL MODE OR WATCH MODE 3 - Use your phone in combination with your Apple Watch. The Watch will send Speed, Cadence and Heart Rate via your phone and transmit these to your bluetooth receiver. (Watch workouts can be saved as part of your daily activity rings) (fully dependant on accuracy of Watch) *New Feature :you can control the speed manually using the crown, simply tap the digital speed to enable/disable. Notes: • TSS Watch Module - requires an Apple Watch to calculate Heart Rate, Cadence and Speed data. • TSS Watch Module integrates with the Health App on your iPhone to contribute to your Activity Rings. It will request permission to access the relevant data types associated with a workout. *Connection to MAC Requires BLE 4.0 - The Mac mini , MacBook Air were both updated with Bluetooth 4.0 support in 2011. The MacBook Pro Mac 2012. The Mac Pro in December 2013.
Written user reviews are not shown here. Check current App Store reviews >
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
react-native-svg
@react-navigation/native
BUILD KIT DIFFICULTY
Intermediate
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.
