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
Rebills — Subscription Tracker
Add digital subscriptions, monthly loan payments, credit card bills,
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
36 ratings · Top 15%
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 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.
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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 Rebills — Subscription 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
Implement a more intuitive dashboard that categorizes subscriptions by type.
Assumption to check: Users find it difficult to manage multiple subscriptions.
Validate with people who use this workflow before building.
Hypothesis 2
Clearly label subscription plans and benefits with a comparison chart.
Assumption to check: In-app purchase confusion regarding subscription tiers.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate customizable notifications and reminders for due dates.
Assumption to check: Lack of reminders for upcoming bills.
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed spending reports and insights into subscription trends.
Assumption to check: Limited analytics on spending trends.
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
Add digital subscriptions, monthly loan payments, credit card bills, lawn care services, child’s allowance, or any other recurring expense you can imagine. Add what you pay for, set a reminder, and move on. No accounts, no analytics, no surprises. Completely rebuilt for 2026: • Modern SwiftUI on iPhone, iPad, Mac, and Vision Pro • Lock Screen, Home Screen, and StandBy widgets — see your next renewal at a glance • Interactive widgets: tap "Mark Paid" without opening the app • Apple Intelligence-ready: ask Siri "What rebills do I have?" • Reminders for any frequency, from every month to once every 5 years • 100+ currencies with full names and symbols • Categories with custom colors • Payment-method tracking with card type + last four digits • iCloud sync across all your Apple devices, end-to-end private • Full JSON export and import — your data is yours • Universal purchase: one app on iPhone, iPad, and Mac What Rebills does NOT do, deliberately: • No bank or card linking • No third-party analytics or tracking • No account or sign-up • No advertising Rebills is for the people who want a calm, fully on-device list of what's recurring, with reminders before each charge. Privacy/Support/Contact: kojya.co/apps/rebills
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
Supabase
Victory Native
React Navigation
Zustand
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.
