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
HextEdit
HextEdit is a fast and lightweight hex editor for viewing and editing binary data
$12.99 · In-app purchases
PRICE
$12.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included16 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 HextEdit: map the core Developer Tools 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
Include more editing tools and formats.
Assumption to check: Limited features compared to advanced hex editors
Validate with people who use this workflow before building.
Hypothesis 2
Add tutorials and tooltips for guidance.
Assumption to check: Difficult for beginners to understand hex editing
Validate with people who use this workflow before building.
Hypothesis 3
Implement cloud save options for user files.
Assumption to check: Lack of cloud integration for file storage
Validate with people who use this workflow before building.
Hypothesis 4
Integrate dark mode for better usability in low-light conditions.
Assumption to check: No dark mode option
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
HextEdit is a fast and lightweight hex editor for viewing and editing binary data. Quickly edit virtually any file type at a low level in a simple and native app. Key Features * Byte inspector Edit bytes as little or big endian signed or unsigned integers, floats, or doubles. View values as binary, decimal, or hexadecimal numbers. * Fast incremental find Find strings, integers, and byte patterns in files. HextEdit has incremental background find, allowing you to continue working while searching very large files. * Fast and native HextEdit runs natively on both Intel-based CPUs and Apple Silicon for great performance. Built using Swift, HextEdit uses an efficient data structure for fast editing of files big or small. * Designed for macOS From the app icon to the full-height sidebar, HextEdit is designed to fit in with macOS and resizes well to adapt to any use case. And more: * Fast and native! * Insert, delete, copy, or paste bytes or strings * Undo/redo * Search for strings, integers, and bytes * Edit bytes as integers, floats, or doubles in any radix * Jump to offset * Zero selected bytes * File version history
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
Zustand
React Navigation
expo-file-system
react-native-gesture-handler
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.
