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
WalkieTalkie VOIP
The easiest-to-use VOIP app returns with a complete overhaul of the user-interface and code under-the-hood.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 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/
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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 WalkieTalkie VOIP: map the core Social Networking 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 users to sync with their phone contacts for easier access.
Assumption to check: Limited contact integration with phone contacts.
Validate with people who use this workflow before building.
Hypothesis 2
Implement group calling to enhance communication.
Assumption to check: Lack of group calling feature.
Validate with people who use this workflow before building.
Hypothesis 3
Add in-call controls for better user experience.
Assumption to check: No in-call features like mute or speaker.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce customization for avatars and status messages.
Assumption to check: Limited customization options for user profiles.
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
The easiest-to-use VOIP app returns with a complete overhaul of the user-interface and code under-the-hood. You can call up other iOS users, or users of the desktop (PC/Mac) application...totally free. Because WT is fully peer-to-peer, there is no signup process. You start the app up, choose a username, and start calling. You don't need to worry about opening ports or lag/latency.. WT automatically connects you through the optimal path for the best VOIP call you've ever heard. * Full-Duplex real-time audio calls (not 'audio clips') * Dynamic buddies-list shows who is online * Buddy-list icons * PING a user to let them know you want to talk * Works on 3g/Edge * Works with a free desktop Mac/PC client * Not necessary to open ports/reconfigure routers * Speakerphone mode * WLAN broadcast many-to-many mode * Works in conference mode (with desktop client hosting call) * Very low latency, crystal clear audio * No signup or subscription, just fire it up and go * Works on networks and in countries competing apps can't * IPhone/iPod/iPad all supported Website: http://www.domain17.net/walkietalkie Support: http://www.domain17.net/walkietalkie/help.html [email protected] ***For a full SIP softphone for making telephone calls, check out our other app: "WeePhone"***
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
WebSocket
react-navigation
expo-av
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.
