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
SpendFriend
Ever wished you knew how much you were spending *before* you got to the checkout at the store?? I for sure have! And I got fed up with being surprised by the price at the register, so I built this app: SpendFriend.
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 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 SpendFriend: 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 automatic transaction categorization via bank linking.
Assumption to check: Users struggle with manual entry of transactions
Validate with people who use this workflow before building.
Hypothesis 2
Create visual progress tracking with easy-to-understand graphics.
Assumption to check: Budget tracking is often cumbersome
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize reports based on different date ranges and categories.
Assumption to check: Limited customization options for reports
Validate with people who use this workflow before building.
Hypothesis 4
Enhance security with better encryption and clear data usage policies.
Assumption to check: Privacy concerns with linked accounts
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
Ever wished you knew how much you were spending *before* you got to the checkout at the store?? I for sure have! And I got fed up with being surprised by the price at the register, so I built this app: SpendFriend. As you walk through the store, with the Speech to Text feature, you can simply say the item you are purchasing and the cost and it all gets entered for you! I hope you enjoy this feature as much as I have. It will help you set your budget and know how much you are spending and how much is available. Due to strange tax laws around what type of food is/is-not taxable, it doesn't always get it *exactly* right, but the main goal here is to never be surprised by how much that checkout total is going to be again. I hope you enjoy the app and are more informed about how much you are paying *before* you get to checkout! :) NOTE: This app is NOT intended to get you a perfect, or exact number of how much you are going to pay, but it should be very close. I'm always working on improving it's accuracy and always strive to get it as close as possible to that final number. Also, if you'd like to try it out for free, minus all the cool features of an iOS app, check out the original version at https://groceryfriend.app
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
Zustand
react-native-paper
react-navigation
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.
