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
SayMoney - Budget & Expenses
Offer!
$3.99 · In-app purchases
PRICE
$3.99
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 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 SayMoney - Budget & Expenses: 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 a clear subscription management section with reminders.
Assumption to check: Difficulty in managing subscriptions and users often forget to cancel.
Validate with people who use this workflow before building.
Hypothesis 2
Use machine learning to suggest categories for transactions.
Assumption to check: Users struggle with categorizing expenses accurately.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance reports with interactive graphs and charts.
Assumption to check: Limited visual representation of data leads to confusion.
Validate with people who use this workflow before building.
Hypothesis 4
Add bill reminder notifications to keep users informed.
Assumption to check: Lack of reminders for bill payments.
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
Offer! Buy SayMoney for your Mac and get SayMoney Mobile for free! The promotion code can be requested in the app. (Menu -> Miscellaneous) SayMoney - Your finances, simplified. SayMoney is a professional and innovative personal finance tracker and budget planner that helps you understand, analyse and visualise your spending habits. Whether for personal budgeting or business use with VAT and tax tracking, SayMoney keeps you in full control of your money — privately, securely and without ads. Highlights - Simple, intuitive design and usage - Manage and evaluate all your finances in one place - Support for multiple accounts, categories, transfers and recurring payments - Business mode with VAT and input tax display for freelancers and small companies - Powerful filtering, sorting, grouping and aggregation of data - Budgeting by category to track spending goals - Protect your data with PIN and Face ID - Voice input, voice output and voice commands - Night mode and five app theme colours - CSV export and import for seamless data transfer - Receipt management, savings targets and grocery lists - Printing, data backup and recovery functions - Encrypted cloud sync via Dropbox, Google Drive and other services - Currency converter with live exchange rates - Forecast feature to predict future balances Privacy & Security - 100% ad-free and tracking-free - Works offline – no bank login required - Your data belongs to you, fully encrypted and under your control SayMoney — the smart, secure way to manage both personal and business finances.
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
Zustand
react-navigation
chart.js
axios
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.
