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
TumbleTrack
TumbleTrack: Your Ultimate Rock Tumbling Assistant
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
11 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 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 TumbleTrack: map the core Lifestyle 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
Allow users to create custom skill categories and types.
Assumption to check: Limited skill categories available
Validate with people who use this workflow before building.
Hypothesis 2
Implement features to share skills and progress with friends.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Introduce analytics and insights for long-term tracking.
Assumption to check: Difficulty in tracking long-term progress
Validate with people who use this workflow before building.
Hypothesis 4
Clarify subscription benefits and streamline the purchase process.
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
TumbleTrack: Your Ultimate Rock Tumbling Assistant. Whether you're a seasoned hobbyist or new to the art of rock tumbling, TumbleTrack simplifies every stage with an intuitive, feature-rich app designed just for you. TumbleTrack Pro : Monthly subscription unlocks Custom Libraries and AI Rock Identification feature & index. Link("Terms of Use (EULA)", destination: URL(string: "https://www.apple.com/legal/internet-services/itunes/dev/stdeula/")!) Link("Privacy Policy", destination: URL(string: "https://tumbletrack.joshvh.com/")!) STAGE TRACKING MADE EASY Track customized (coarse, medium, fine, pre-polish, polish, borax or burnish) stages with automatic 7-day timers. Snooze your Tumbles, or easily move to the next stage with a single tap. STAGE HISTORY Review past stage results, details and photos for full process comparisons. Add as many stages as you need to get just the right shine! PHOTO DOCUMENTATION Attach photos to document before-and-after results of your tumbles. Never again forget what rocks are in which tumbler! SMART NOTIFICATIONS Never miss a stage transition with timely reminders and notifications. White boards, vague calendar reminders, and post-it notes can be a thing of the past. CUSTOM NOTES & METRICS Record grit types, scoop counts, rock types, and personal notes for every tumble. Develop your own recipes for success! SEAMLESS NAVIGATION Enjoy a modern, card-based design for a smooth user experience. WHY CHOOSE TUMBLETRACK? Made by Rock Tumblers for Rock Tumblers! Track all your critical data on individual Tumbles. Track Multiple On-going Tumbles with a single App. Reliable reminders and progress tracking. Perfect for enthusiasts looking to document and improve their results. Easy to manage multiple tumbling projects with tailored notifications. SIMPLIFY YOUR ROCK TUMBLING PROCESS Become part of a growing community that’s perfecting their passion for polished stones. Try TumbleTrack today and take your tumbling to the next level.
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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.
