App Overview

Who.Paid icon

Who.Paid

The K2 Project LLC · Finance

Who Paid is the easiest way for friends, family or co-workers to keep track of shared bills or expenses such as lunch, coffee, dinner, drinks, groceries, golf, gas or any other expense without having to split bills ev...

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.2
5 ratings · Top 30%

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 included14 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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Who.Paid: 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

Provide multiple formats for exporting data, including CSV and PDF.

Assumption to check: Limited transaction history export options

Validate with people who use this workflow before building.

Hypothesis 2

Implement a feature to set up and track recurring transactions easily.

Assumption to check: Difficulty in managing recurring expenses

Validate with people who use this workflow before building.

Hypothesis 3

Add charts and graphs to visualize spending patterns.

Assumption to check: Lack of visual representation for expenses

Validate with people who use this workflow before building.

Hypothesis 4

Integrate reminders for due payments to avoid late fees.

Assumption to check: No reminder 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

Who Paid is the easiest way for friends, family or co-workers to keep track of shared bills or expenses such as lunch, coffee, dinner, drinks, groceries, golf, gas or any other expense without having to split bills every time or stressing about remembering who paid last or who owes who. Who Paid lets you focus more on your friends and less on the bill. Who Paid is great for: - Friends who frequently get together for lunch, drinks or other shared activities - Friends or Colleagues that prefer not to split bills - Helping a friend cover expenses and keeping track for easy re-payment - Eliminating the stress of trying to remember Who Paid last - Easily keep tabs of who you need to pay back. - Co-workers going out to coffee, sharing a meal or enjoying drinks after work couldn’t be easier. “You pay for this round, I’ll get the next round tomorrow” - Not having to ask for money or Venmo every time you get together to share bills - Providing friends with a simple breakdown of all shared expenses and who paid for what Who Paid is simple to use: - Create a new event such as lunch, drinks, or coffee - Add the friend or friends who joined you - Select who paid. All Done! Add more events with friend(s) in seconds and easily keep track. Why we created Who Paid: We love getting together with friends and focusing on the conversation and quality time together. We hate the idea of spending precious time at every meal trying to split the bill and we love the idea that if one person pays today, there is certain to be another get together soon. Powerful Features: - Add friends quickly and easily - See who paid last right from the home screen - Keep track of all past events - Message friends What People are saying: “I love how easy Who Paid is to use! I am a people person so using Who Paid not only makes paying much simpler but it also ensures that my friends and I get to plan another get together” - The creator of Who Paid “Who Paid is an amazing App. The creator of this App is really brilliant” - The creator of Who Paid’s mother “Keeping track of all the money my friends owe me is such a headache.” - Millions of teenagers every day “Worrying about who paid last every time the bill comes is so stressful.” - People who just love quality time with friends and family

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.

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BUILD KIT DIFFICULTY
Starter

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.