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
Ledger — 50/30/20
Ledger is a calm, private way to budget with the proven 50/30/20 rule.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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.
JavaScript is required to complete mailbox verification.
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 Ledger — 50/30/20: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Allow users to create and customize their own categories.
Assumption to check: Limited customization for budget categories
Validate with people who use this workflow before building.
Hypothesis 2
Implement bank linking for automatic transaction imports.
Assumption to check: No integration with bank accounts
Validate with people who use this workflow before building.
Hypothesis 3
Provide detailed reports and visual analytics for spending.
Assumption to check: Lack of advanced analytics and reporting
Validate with people who use this workflow before building.
Hypothesis 4
Enable users to set up and manage recurring transactions easily.
Assumption to check: Limited support for recurring transactions
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
Ledger is a calm, private way to budget with the proven 50/30/20 rule. Your income splits into three simple categories: Needs, Savings, and Wants. Ledger shows you exactly where you stand at a glance. No spreadsheets, no bank logins, no clutter. BUILT ON 50/30/20 • Set your monthly income and let Ledger split it into Needs (50%), Savings (20%), and Wants (30%) - or customize the percentages to fit your goals. • Watch each bucket fill as you log spending, with clear "remaining" and "over budget" cues. • Close out each month and start fresh; past months stay archived. PRIVATE BY DESIGN • No account, no sign-in, no ads, no tracking, no analytics. • Your data lives on your device and syncs through your own iCloud. No one but you sees it. • Optional Face ID or supported biometric lock. • Apple Intelligence on device processing, your data doesn't leave your device. EVERYWHERE YOU ARE • Native apps for iPhone, iPad, Mac, and Apple Vision Pro. • Home Screen and Lock Screen widgets for a glance at what's safe to spend. • Quick-add with Siri, the Action Button, and Shortcuts. THOUGHTFUL TOUCHES • An on-device AI command bar: type "spent $40 on groceries and $12 on coffee" and Ledger adds the transactions - processed entirely on your device. • Budget alerts when a bucket nears or passes its limit. • Beautiful themes with full Light and Dark Mode support. • Export your data anytime as JSON or CSV. Ledger isn't trying to connect to your bank, run ads, etc. It's a simple, honest tool to help you spend with intention.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Supabase
react-native-reanimated
@supabase/supabase-js
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.
