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
Tabby: Pay over time
SHOP NOW
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
80,246 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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Tabby: Pay over time: 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 robust onboarding process with detailed error handling.
Assumption to check: Users often report issues with account linking failures.
Validate with people who use this workflow before building.
Hypothesis 2
Add machine learning for better categorization and user feedback.
Assumption to check: Transaction categorization can be inaccurate.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate budget tracking and alerts for overspending.
Assumption to check: Users desire more budgeting features.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a chat support feature within the app.
Assumption to check: Limited customer support options.
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
SHOP NOW. PAY LATER Tabby lets you shop what you love and split purchases into four monthly payments — with no interest, no hidden fees and no surprises. Whether you're shopping online or in store, Tabby gives you control, financial flexibility and peace of mind. SHOP FROM TOP BRANDS Discover and shop your favorite brands including AMAZON, SHEIN, IKEA, ADIDAS, SIVVI, CENTREPOINT, and many more in one shopping app. The Tabby app is your one-stop shopping destination, packed with fashion, electronics, home goods, makeup, and more. COMPARE PRICES & SAVE MONEY Track price drops and compare products across multiple stores. With smart alerts, you’ll always get the best deal — your personal price-checker, built right in. NEW DEALS AND DISCOUNTS EVERY DAY Shop daily discounts, coupons and promotions from top brands. Never miss a deal — just open the app and see what’s new. FIND NEARBY STORES THAT ACCEPT TABBY Use our in-store map to discover shops and malls that accept Tabby. Try before you buy and still pay later. Search by brand, category or location. ONE APP FOR ALL YOUR SHOPPING Manage payments, track purchases, get reminders and explore new brands — all in one app. PROTECT YOUR PURCHASE WITH TABBY CARE Tabby Care adds extra peace of mind. It covers your purchases, makes returns easy and protects your order every step of the way. 24/7 CUSTOMER SERVICE Use chat in the Tabby app for round-the-clock support. Tabby gives you the freedom to pay later with no interest, no fees and no surprises — so you can shop on your terms. Follow us to stay up-to-date on new stores and latest deals: Instagram: https://www.instagram.com/tabbypay/ X: https://x.com/paywithtabby/ Need help? Reach out to http://help.tabby.ai/
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
Axios
React Navigation
Redux
Shadcn/UI
BUILD KIT DIFFICULTY
Expert
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.
