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
Can I Buy? Budget Tracker
Wondering if a purchase fits your budget? Enter the amount and get an instant answer
$0.99
PRICE
$0.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 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 Can I Buy? 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Wondering if a purchase fits your budget? Enter the amount and get an instant answer. Simple, fast and 100% anonymous. Manage your budget without an account, without signing up, without ads. Can I Buy? BUDGET MANAGEMENT Set your monthly budget — resets automatically each month Split across categories: Essentials, Wants and Savings Real-time overview of your remaining budget PURCHASE CHECK Instantly check if you can afford a purchase View your spending by category and by month PRIVACY & SECURITY No account required — no sign-up No ads — no tracking Fully offline — no internet connection needed All data stays locally on your device Anonymous — we don't know who you are EXTRA Available in EN, NL, DE, FR and ES Supports multiple currencies (EUR, GBP, USD) Sleek dark design WHAT IS CAN I BUY? Offline budget tracker for people who want a budget app with no account, a private expense tracker that keeps all your data on your device, an ad-free budget app without tracking or cloud storage, and a budget tracker with no login required just open and start budgeting. Can I Buy? Works completely offline — your financial data never leaves your device.
Written user reviews are not shown here. Check current App Store reviews >
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 automatic categorization of transactions based on merchant.
Assumption to check: Users often struggle with budget tracking due to lack of categorization.
Validate with people who use this workflow before building.
Hypothesis 2
Add analytics and reporting features like pie charts and trend graphs.
Assumption to check: Difficulty in visualizing spending trends over time.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce reminders and alerts for budget updates and transaction entries.
Assumption to check: Users forget to update budgets or add transactions regularly.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with popular financial APIs for easier bank account linking.
Assumption to check: Limited account linking options can hinder usability.
Validate with people who use this workflow before building.
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
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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.
