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
Pacer Pedometer Step Counter
Whether you’re just starting out or chasing big goals, wanting to get active or lose weight, Pacer’s insightful data, outdoor routes, and personalized plans help you move more, feel great, and stay on track—like your ...
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
328,314 ratings · Top 5%
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 included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Pacer Pedometer Step Counter: 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
Implement more precise algorithms using sensor data.
Assumption to check: Users find step tracking inaccurate.
Validate with people who use this workflow before building.
Hypothesis 2
Add challenges and social sharing options.
Assumption to check: Limited social features.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify pricing tiers and clarify benefits.
Assumption to check: Subscription pricing can be confusing.
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
Whether you’re just starting out or chasing big goals, wanting to get active or lose weight, Pacer’s insightful data, outdoor routes, and personalized plans help you move more, feel great, and stay on track—like your 24/7 walking buddy. Join over 12 million happy walkers and find motivation every step of the way. WHY YOU'LL LOVE PACER - Effortless Activity Tracking Tracks steps, flights climbed, calories burned, distance, and active time—whether your phone is in your hand, pocket, or bag. Syncs with Apple Health and Apple Watch for seamless data. - Motivation & Community Support Join walking groups, compete in friendly challenges, and share progress with friends and family in real time—no matter what phone they use. - Explore Outdoors with GPS Mapping Explore local gems—routes, trails, and parks. Record every walk, hike, run, or ride with precision maps. - Personalized Fitness Plans & Weight Management Set daily goals, track your weight and BMI, and use guided workouts designed to help you lose weight and get fit. - Simple Setup, No Extra Devices Needed Just download and start—no wristbands or hardware required. HEAR FROM OUR HAPPY WALKERS: - “Best Walking App. Period. I love this app and use it for every walk.” — James T. - “I'm 73 and I especially like that if I start an activity and want my kids to be able to monitor where I am I can turn live tracking on in Pacer.” — Dr J. - “…Tracks all progress and more! Love the challenges and clubs to join all while sharing and interacting with others all the hard earned work. Definitely recommend.” — Lustine K. - “Cheaper and better than a gym membership and 1000x more effective!” — Covette92 READY TO TAKE THE FIRST STEP? Download Pacer for free today and start your journey to better health with the happiest walking community! Note: - Pacer offers both a free version and a premium subscription with additional features. If you choose to subscribe, payment will be charged to your Apple ID upon confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. - Pacer has an optional feature for more accurate tracking that uses of iOS's location based services. - Terms of Service https://www.mypacer.com/termsofservice/ - Privacy Policy: https://www.mypacer.com/privacy
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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.
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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.
