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
RingCentral
Run your business communications from anywhere with AI built in.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
77,245 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 included19 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 RingCentral: 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
Implement more granular notification settings.
Assumption to check: Users report difficulty in managing notifications effectively.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize background processes and improve loading times.
Assumption to check: Some users find the app's performance slow under heavy load.
Validate with people who use this workflow before building.
Hypothesis 3
Expand available integrations to enhance productivity.
Assumption to check: Limited integration with third-party apps.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the layout and improve visual hierarchy.
Assumption to check: User interface can be cluttered.
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
Run your business communications from anywhere with AI built in. RingCentral brings your business phone, messages, and meetings into one powerful mobile app, enhanced with AI across every interaction. AI-powered communication, everywhere AI Receptionist Automatically answer, route, and manage inbound calls so your business never misses a customer. AI Calling Handle calls smarter with AI-powered assistance during and after every conversation. AI Notes and Transcripts Capture every call and meeting with transcripts, summaries, and action items. AI Conversation Expert Get insights, coaching, and recommendations to improve conversations and outcomes. AI Messaging and SMS Manage customer conversations in a shared SMS inbox and let AI draft replies and recaps. Your complete business phone on mobile • Make and receive calls with your business number • Send and receive SMS and team messages • Host and join video meetings from anywhere • Access contacts, call history, and voicemail in one place Built for teams and businesses of any size • Support sales, service, and operations on the go • Stay connected across devices with one unified system • Integrate with Google, Microsoft, Salesforce, and more Enterprise-grade reliability • Secure, compliant cloud communications • 99.999% availability for business-critical conversations • Trusted by 500,000 businesses worldwide Download now and access your RingCentral communications on mobile.
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
React Navigation
Zustand
React Native Reanimated
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.
