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
Cashtra - Budget Tracker
Take control of your personal finances with Cashtra.
$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 included14 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 Cashtra - Budget Tracker: 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
Design a simpler navigation flow with clear labels.
Assumption to check: Users often find budgeting apps too complex to navigate.
Validate with people who use this workflow before building.
Hypothesis 2
Implement machine learning for better categorization.
Assumption to check: Automatic categorization of transactions is often inaccurate.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to create custom categories and budgets.
Assumption to check: Many apps lack customization options for budgets.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate bank account linking for automatic transaction imports.
Assumption to check: Users dislike entering transactions manually.
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
Take control of your personal finances with Cashtra. Cashtra is a privacy-first expense and budget tracker built for cash, cards, bank accounts, bills, debt payoff, and savings goals — with no account required, no bank connections, and no subscriptions. Your financial data never leaves your iPhone. Track daily spending, recurring subscriptions, credit card utilization, and personal loans all in one place with instant calculations and smart financial pacing. FEATURES • Smart Safe-to-Spend: Daily spending allowance dynamically adjusts to keep you on budget without stress. • Priority Dues & Bill Tracking: Urgent bills, recurring subscriptions, and upcoming dues stay front and center until marked paid. • Bill Split & Receipt Cards: Split group expenses with friends, track who owes what, and generate classic shareable receipt cards. • Interactive Widgets: Check balances, view weekly calendar breakdowns, and log expenses directly from your Home Screen and Lock Screen. • Receipt-Style Quick Log: Record transactions in seconds with an integrated keypad calculator, multi-currency switcher, and custom categories. • Credit Cards & Debt Payoff: Monitor balances, credit limits, utilization percentages, and loan payoff progress. • Savings Goals: Set target dates and visualize milestone progress for your emergency fund or big purchases. • Biometric Security: Lock your app with Face ID or Touch ID to keep your budget private. • CSV Import & Export: Easily import past transactions and export clean, formatted CSV backups anytime. • Multi-Currency & Offline Support: Manage accounts in multiple currencies with cached rates and full offline reliability. • Available in 15 Languages: Fully localized experience tailored to your preferred language. PRIVATE BY DESIGN • No account sign-up required • No bank logins or account syncing • All data is stored locally on your device with SwiftData • No ads, no tracking, and zero telemetry Cashtra is a personal budgeting and financial tracking tool. It does not provide financial, investment, or tax advice.
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
React Navigation
Axios
react-native-paper
@react-native-community/datetimepicker
BUILD KIT DIFFICULTY
Starter
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.
