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
Yapp
With Yapp, you can view the mobile experience for your conference, social event, group, sports team, school, local business, and more.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.6
98 ratings · Top 50%
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 included18 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 Yapp: map the core Business 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
Allow deeper customization with more templates and designs.
Assumption to check: Limited customization options for event apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement clearer tab navigation and onboarding.
Assumption to check: Confusing navigation structure
Validate with people who use this workflow before building.
Hypothesis 3
Optimize performance for handling multiple events.
Assumption to check: Inconsistent performance with large event data
Validate with people who use this workflow before building.
Hypothesis 4
Provide comprehensive tutorials and in-app support.
Assumption to check: Lack of user support and tutorials
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
With Yapp, you can view the mobile experience for your conference, social event, group, sports team, school, local business, and more. Haven’t been invited to a Yapp? To see a sample, enter CONFERENCE as your Yapp ID. Yapp features include: • Schedule – See up-to-the-minute information so you know where to be when, and create your personal schedule • People – Get bios on people, sponsors, and key contacts • Social Feed – Connect with others and receive breaking news via push notifications • Documents – View important documents right in the app • Photo sharing – Take and share photos. See official photos in the Gallery • Polls – Vote and see the results in real-time • Video - Playback video the Yapp creator has posted • Tickets – Buy tickets through Eventbrite • Offline browsing – See your content even if you are out of network range Have feedback? Email [email protected] Made with love by Yapp, Inc. and You
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
Zustand
React Navigation
Firebase
expo-image-picker
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.
