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
ThriftTracker
ThriftTracker - Your TSP, Beautifully Simple!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 included16 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 ThriftTracker: map the core Finance 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 machine learning for automatic categorization.
Assumption to check: Users often find it difficult to categorize transactions accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Add colorful charts for budget progress.
Assumption to check: Lack of visual budget tracking can make it hard to understand spending.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate more financial institutions for account linking.
Assumption to check: Limited account linking options can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the pricing structure and enhance communication about benefits.
Assumption to check: In-app purchases can be confusing for users.
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
ThriftTracker - Your TSP, Beautifully Simple! Finally, visualize federal retirement holdings the way it should look on iPhone, iPad, and Mac. • Current and historical fund prices and charts for the G, F, C, S, I, L Income Funds and other Lifecycle Funds (2075, 2070, 2065, 2060, 2055, 2050, 2045, 2040, 2035, and 2030). • Widgets for any fund on your Home Screen or StandBy mode. • A widget for your total portfolio value. • A widget for your retirement date. • Zero logins, zero personal data collected. • On supported devices with Apple Intelligence, ThriftTracker offers textual summaries of historical fund data using built-in, on-device processing. • Hands-free with Siri -- just say "Hey Siri, what's the price of the G Fund in ThriftTracker?" or "Hey Siri, when's my retirement date in ThriftTracker?" for a quick response. • Perfect for active federal employees and retirees. Stop opening your other websites. Stop copying numbers into spreadsheets. Stop wondering "how is my TSP doing?" Just glance at your widgets -- wherever your decide to place them! WE THINK YOU'LL LOVE: • Simple and thoughtful widgets to help you focus on what's important. You don't need to be a finance pro! • Small, medium, and large widgets for your fund charts, retirement date, and portfolio value. • Effortless synchronization of your portfolio snapshots with iCloud. • Looks great on iPhone, iPad, and Mac. • No ads, no tracking, no upsells -- just a clean one-time purchase. PRIVACY FIRST: • No account or sign-in is required (or even offered). • All fund price data is sourced from publicly available third-party information and your information is not shared or transmitted by ThriftTracker. ACCESSIBILITY IS BUILT IN: • We put special emphasis on designing a user interface that scales for different screen and font sizes • Beautiful light and dark modes automatically adapt to your device settings IMPORTANT: ThriftTracker is an independent, unofficial app and is not affiliated with, endorsed by, sponsored by, or associated with the Federal Retirement Thrift Investment Board (FRTIB), the Thrift Savings Plan (TSP), or any U.S. government agency. No login nor personal information is ever required or collected. As such, the value of your portfolio is estimated using the data that you provide in the app (if you choose to do so). All fund price data is sourced from publicly available third-party information and is provided for informational purposes only. ThriftTracker does not guarantee the accuracy, completeness, availability, or timeliness of the information displayed. Information is provided "as is" without warranty of any kind. ThriftTracker does not provide investment, financial, legal, or tax advice. All investment decisions remain the sole responsibility of the user. Always consult official sources and your own financial professional. Textual summaries are generated using Apple Intelligence features on compatible devices. This app integrates official APIs and does not share data with third parties. Voice features use Apple's Siri and "Hey Siri" activation on compatible devices. This app integrates official SiriKit APIs for hands-free access to the app's data -- no data is shared with Apple or third parties. TERMS OF USE (END USER LICENSE AGREEMENT [EULA]): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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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.
