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
Hex: Dev Tools
Hex is a developer multi-tool for iPhone and iPad
$1.99 · In-app purchases
PRICE
$1.99
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 Hex: Dev Tools: 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
Allow users to create custom tools or scripts.
Assumption to check: Limited tool customization options
Validate with people who use this workflow before building.
Hypothesis 2
Implement a guided onboarding tutorial for new users.
Assumption to check: Poor user onboarding experience
Validate with people who use this workflow before building.
Hypothesis 3
Integrate a community forum for users to share tools and tips.
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 4
Provide analytics to track which tools are most used and by whom.
Assumption to check: No analytics on tool usage
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
Hex is a developer multi-tool for iPhone and iPad. 21 utilities across 5 categories — everything you reach for daily but shouldn't need a laptop to use. ENCODE Base64 Encode/Decode URL Encode/Decode HTML Entity Encode/Decode JWT Token Decoder Hash Generator (MD5, SHA-1, SHA-256, SHA-512) FORMAT JSON Formatter & Validator XML Formatter SQL Formatter Markdown Preview HTML Preview GENERATE UUID Generator (batch mode) Lorem Ipsum Generator Password Generator with strength meter Color Converter (HEX / RGB / HSL) File Checksum TIME Unix Timestamp Converter Cron Expression Parser Timezone Converter TEXT Diff Checker Regex Tester with live match highlighting Text Inspector (character, word, line count) BUILT FOR DEVELOPERS Clipboard auto-detection suggests the right tool instantly Deep link support (hex://json, hex://base64, etc.) Export results in native file formats Haptic feedback throughout Dark theme with monospace typography PRIVACY FIRST Works 100% offline — no network access, ever No analytics, no tracking, no accounts No subscriptions — one-time purchase Built by Shy Guy LLC.
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
Supabase
React Navigation
React Native Paper
Axios
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.
