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
Messenger
Messenger is a free messaging app that helps you connect with anyone, anywhere
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
13,598,273 ratings · Top 15%
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 Messenger: 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
Optimize message loading and image compression.
Assumption to check: Slow performance with large groups or media-heavy chats.
Validate with people who use this workflow before building.
Hypothesis 2
Provide extensive settings for notification preferences.
Assumption to check: Limited customization options for notifications.
Validate with people who use this workflow before building.
Hypothesis 3
Implement end-to-end encryption and clear privacy policies.
Assumption to check: Privacy concerns with data sharing.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce advanced search filters and message organization.
Assumption to check: Difficulty in managing large conversations.
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
Messenger is a free messaging app that helps you connect with anyone, anywhere. Stay in touch with your friends and family, explore your interests with people like you, build your community, and share your vibe beyond words, all in one app. CHAT AND CALL ANYONE, ANYWHERE Find and connect with your friends and family on Facebook and Messenger, no phone number needed. GET INSTANT ANSWERS FROM YOUR AI ASSISTANT* Meta AI is your assistant that can answer any questions, give you advice, help with homework, and more. SEND YOUR PHOTOS IN HIGH DEFINITION Send and receive clearer, crisper picture of your favorite moments with Messenger. CREATE SHARED ALBUMS From a recent summer vacation to your grandma’s 80th birthday, create albums of photos and videos to share, organize and reminisce over important moments in your group chats. EASILY ADD NEW CONNECTIONS WITH QR CODES Connect with people you meet in real life by scanning their Messenger QR code or sharing yours via a link. SHARE LARGE FILES DIRECTLY IN CHAT Whether it’s a Word, PDF, or Excel doc, you can send large files up to 100MB right inside of Messenger. EDIT AND UNSEND MESSAGES Hit send too soon? You can edit the message up to 15 minutes after sending DISAPPEARING MESSAGES Some things aren’t meant to last forever. Choose how long your end-to-end encrypted chats stick around after they’ve been read. COME TOGETHER WITH YOUR COMMUNITIES Meaningfully connect with people like you from your school, neighborhood, and interest groups. GET IN YOUR FAVORITE CREATORS’ INNER CIRCLE Stay in the know with creators by joining their broadcast channels for authentic and casual content. UNLEASH YOUR IMAGINATION W/ META AI* Tap into your go-to creative partner to create, edit, animate images and more. CAPTURE EVERYDAY MOMENTS ON STORIES Highlight moments of your day using photos and videos that disappear after 24 hours in Stories. DROP A NOTE WITH YOUR THOUGHTS Stay connected with your friends by sharing quick updates that disappear after 24 hours. BRING YOUR VIBE TO YOUR CHATS Sometimes words just don’t cut it. Tap into more ways to express yourself with animated stickers, GIFs, reactions and more. SET THE MOOD OF YOUR CHAT WITH THEMES Customize your chat with a large and constantly evolving list of themes featuring popular artists, holidays, and more. *Meta AI is available in select languages and countries only, with more coming soon.
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
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.
