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
rubiTrack 6
rubiTrack - the power and dazzling user interface of rubiTrack on the go
$22.99 · In-app purchases
PRICE
$22.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
5 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.
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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.
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 rubiTrack 6: 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
Expand workout categories and include more tracking metrics.
Assumption to check: Limited workout types and tracking options.
Validate with people who use this workflow before building.
Hypothesis 2
Offer more flexible pricing or free tier.
Assumption to check: High price point for premium features.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and onboarding process.
Assumption to check: User interface may feel cluttered for new users.
Validate with people who use this workflow before building.
Hypothesis 4
Improve integration with HealthKit and Google Fit.
Assumption to check: Inconsistent syncing with health data.
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
rubiTrack - the power and dazzling user interface of rubiTrack on the go. The perfect companion for Apple Watch. rubiTrack is developed exclusively for Mac and iPhone. rubiTrack now looks even more stunning in dark mode. * rubiTrack is a brand new app with a unique and extremely powerful feature set. * rubiTrack supports workouts recorded with Apple Watch (via the Health app). * rubiTrack lets you browse years of data effortlessly and in style. * rubiTrack syncs your entire training database from rubiTrack 6 for Mac using WiFi syncing. * rubiTrack helps analyzing your training in a level of detail never before possible. * rubiTrack comes with many features, these are just a few: Activities, support for workouts from Apple Watch and the Health App, Recorder and auto-sync. * rubiTrack PRO comes with a lot more, for example: Places, calendar, equipment, training summary including performance analysis and much much more. * rubiTrack protects your privacy! All your data is stored right on your iPhone. * Use rubiTrack's athlete log to browse all your health data in style! (PRO) UNIVERSAL APP rubiTrack 6 is available as a Universal App for your Mac and iPhone. PRO SUBSCRIPTION - 7-DAY TRIAL rubiTrack 6 PRO is available as a cross-platform universal subscription. When subscribed, PRO features become available for both the macOS and the iOS version. rubiTrack 6 PRO is a yearly auto-renewing subscription. When you subscribe for the first time, you can test rubiTrack 6 PRO for 7 days. You will not be charged, if you cancel the subscription at least one day before the end of the trial. For a detailed comparison between base version and PRO subscription see https://www.rubitrack.com/pro.html See the terms of use here: https://www.rubitrack.com/termsofuse.html
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.
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BUILD KIT DIFFICULTY
Advanced
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.
