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
HEVC - Convert H.265 and H.264
[HEVC] enables you to cross convert codec of H.265 and H.264 video files.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.9
7 ratings · Below Average
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 included17 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 HEVC - Convert H.265 and H.264: 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
Expand to support more video formats like MP4, AVI.
Assumption to check: Limited file format support
Validate with people who use this workflow before building.
Hypothesis 2
Optimize conversion algorithms for faster processing.
Assumption to check: Conversion speed is slow
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI/UX for a more engaging experience.
Assumption to check: User interface is basic
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to convert multiple videos at once.
Assumption to check: No batch processing
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
[HEVC] enables you to cross convert codec of H.265 and H.264 video files. You can convert H.265 videos to H.264 videos for better compatability. You can also conver H.264 videos to H.265 videos for better space effiency. Unlike the systemwise selection of codec, [HEVC] enables you to convert individual video file to specific codec you want. • Detect H.264 (old codec type) videos automatically. • Detect H.265 (new code type) videos automatically. • Convert old H.264 format to new H.265 format for space efficiency. It would compress video and let you regain more space. • Convert new H.265 format to old H.264 format for better compatability. It would enlarge file size, but provide better compatabiity instead. • Optionally reduce the resolution of the videos for additional compression. • Save the converted videos to device. • Share the converted videos.
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
Redux
React Navigation
React Native FS
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BUILD KIT DIFFICULTY
Intermediate
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.
