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
MarkRun: Walk to get rewards
Turn your daily steps and activity into tangible rewards with MarkRun
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
3,226 ratings · Top 30%
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 MarkRun: Walk to get rewards: 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 a variety of rewards and challenges to engage users.
Assumption to check: Users often find it difficult to stay motivated without diverse rewards.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance GPS tracking for better accuracy.
Assumption to check: Tracking accuracy can be inconsistent with different devices.
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing and challenges with friends.
Assumption to check: Limited social features reduce user interaction.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize performance and reduce app loading times.
Assumption to check: App can be slow to load or crash during heavy usage.
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
Turn your daily steps and activity into tangible rewards with MarkRun. Stay active, improve your health, and unlock great rewards as you develop good habits. Key Features: Step Tracking Automatically records your daily steps and activity, helping you understand your movement patterns and stay consistent over time. Guided Fitness Courses Engage in structured workouts and progressive challenges designed to improve strength, endurance, and overall fitness while earning rewards along the way. Daily Missions & Rewards Complete walking goals and fitness tasks each day to earn points and accumulate rewards as you progress. Redeem Rewards After reaching designated milestones, you can redeem your earned Calocoins for rewards and shards. Accurate Activity Tracking Enhances step detection accuracy and supports reliable activity tracking to ensure fair reward calculation. Privacy & Data Protection Your fitness data is used solely to support app functionality and improve your experience. We prioritize privacy and never share data without your consent. We hope our app can make become a better and healthier you: Suggestions for questions: [email protected] User Agreement: https://resource.mark-run.com/MarkRun/statement.html Privacy Agreement: https://resource.mark-run.com/MarkRun/privacy.html Start your journey with MarkRun today and build healthier habits through structured fitness, motivation, and meaningful rewards.
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
redux-toolkit
expo-location
@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.
