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
Captions: AI Edits Your Video
AI EDIT THAT EDITS LIKE A PROFESSIONAL VIDEO EDITOR
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
38,954 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 Captions: AI Edits Your Video: map the core Photo & Video workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
AI EDIT THAT EDITS LIKE A PROFESSIONAL VIDEO EDITOR Built by Mirage™, Captions is an AI video generator and video editor that makes it easy to go from idea to ready-to-share content, no experience needed. Get started by importing a video or generating engaging content from scratch using text to video. You can create an AI actor or upload a selfie to create a personal avatar, allowing you to produce polished footage of yourself without ever needing to record again. From there, skip the hours spent toggling and tweaking manual edits. Our AI video editor applies editorial discernment to cut scenes, overlay B-roll, and integrate sounds based on your video. Whether you polish your video with our AI edit feature or describe desired changes to our chat-based editor, Captions’ intuitive video maker makes it easy to bring your vision to life. LET AI EDIT FOR YOU - One-tap AI video editing: Transform raw footage into ready-to-post content instantly with curated effects and trending aesthetics. - Edit like you text: Just describe your vision in plain language; our chat-based editor will apply effects, transitions, B-roll, and pacing per your direction. CREATE A PERSONAL AI AVATAR - AI Twin: Turn a single selfie into a high-quality video of yourself using our AI video generator. - AI Actors: Generate talking videos with engaging AI avatars, giving you a digital on-brand spokesperson. - Adjust looks: Change outfits, add objects, and switch backgrounds to feature the same AI avatar across unlimited videos. AI-POWERED EDITING TOOLS - AI Denoise: Automatically remove background noise from talking videos. - AI Zoom: Instantly add relevant zooms to your content. - AI Scale: Quickly resize videos for whatever aspect ratio you need. - AI Hashtags: Automatically generate video captions and hashtags. - AI Teleprompter: Read directly from your script while recording in-app. - Multiple AI models: Choose from 20+ models to generate music, sounds, and visuals. CAPTIONS AND DUBBING - AI Dubbing: Dub your content into 29 languages with just a tap of a button. - AI Subtitles: Automatically generate accurate captions or subtitles in 91+ languages. You can choose specific fonts and colors too. Captions, LLC (US) Developer
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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
Offer more styles, fonts, and animations for captions.
Assumption to check: Limited caption customization options.
Validate with people who use this workflow before building.
Hypothesis 2
Ensure smoother performance and bug fixes.
Assumption to check: Occasional bugs with video playback.
Validate with people who use this workflow before building.
Hypothesis 3
Test thoroughly on multiple devices for consistent performance.
Assumption to check: Inconsistent user experience across devices.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer explanations for premium features and pricing.
Assumption to check: Subscription model may confuse users.
Validate with people who use this workflow before building.
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/native
react-native-reanimated
@supabase/supabase-js
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.
