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
CastOn - Screen Mirror & Share
Ever wanted to show something on your iPhone, but it felt like everyone needed a magnifying glass to see it? Whether you're sharing vacation photos at a family gathering, brainstorming ideas for a project, or simply w...
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
3,343 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 CastOn - Screen Mirror & Share: map the core Utilities 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 a more stable connection protocol.
Assumption to check: Users often experience connection drops during mirroring sessions.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to manually adjust settings for better performance.
Assumption to check: Limited customization options for resolution and quality.
Validate with people who use this workflow before building.
Hypothesis 3
Add a more efficient device discovery and filtering system.
Assumption to check: Difficulty in finding available devices quickly.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the onboarding process with guided tutorials.
Assumption to check: Confusing user interface for new users.
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
Ever wanted to show something on your iPhone, but it felt like everyone needed a magnifying glass to see it? Whether you're sharing vacation photos at a family gathering, brainstorming ideas for a project, or simply watching videos with friends, CastOn lets you see it all on a big screen! Just connect both devices to the same WiFi, and you’re all set to mirror your iPhone screen to your TV in real time. Why You’ll Love CastOn: • Screen Mirroring Why settle for a tiny iPhone screen to share your pics and videos when you can go big and bold, mirroring anything you want from your iPhone to your Smart TV? With CastOn, you can watch your favorite TikTok dances and YouTube cat videos in full TV glory! Plus, you can mirror your browser as well, which makes it ideal for planning trips, showing memes, or just browsing together. • Photo and Video Cast Forget about passing your iPhone around like a hot potato to show those photos and videos. With CastOn, you can beam your birthday party pics to your TV to relive those epic moments together! And the good news is that you can still reply to messages or do other things you need without showing it on your display, as this feature casts the content from your Photos only. • Whiteboard In the Whiteboard mode, whatever you doodle on your iPhone instantly appears on your TV. Collaborate with friends on party themes, sketch out DIY project plans, or simply play tic-tac-toe with the kids. Here, fun is amplified together with the screen size! • Live Stream Turn your iPhone into a live camera feed for your TV. See what’s happening in another room, keep an eye on your pets, or become the director of your own reality show during parties. The possibilities are endless and oh-so-entertaining! Want to make your device screen 10 times bigger? Download CastOn now and let everyone enjoy your special moments and favorite content on the big screen! UNLIMITED ACCESS TO ALL FEATURES - You can subscribe for unlimited access to all app’s features. - Subscriptions are billed automatically at the rate depending on the selected subscription plan. By using the app, you confirm that you acknowledge and accept our Privacy Policy and Terms of Use: https://epicscale.io/mirror_ios/privacy https://epicscale.io/mirror_ios/terms
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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/native
react-native-async-storage
expo-av
BUILD KIT DIFFICULTY
Advanced
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.
