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
DevKnife
DevKnife is a collection of everyday utilities for developers, packed into one fast, native macOS app.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
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/
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 DevKnife: 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
Offer a wider variety of tools and integrations.
Assumption to check: Limited tool options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more modern UI with intuitive navigation.
Assumption to check: Poor user interface and navigation
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate user reviews and ratings for tools.
Assumption to check: Lack of user feedback and reviews
Validate with people who use this workflow before building.
Hypothesis 4
Add a community section for users to connect and share tips.
Assumption to check: No community or support features
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
DevKnife is a collection of everyday utilities for developers, packed into one fast, native macOS app. Instead of jumping between websites, browser tabs, and small scripts, DevKnife keeps the tools you use most in one place — running locally on your Mac for speed, privacy, and focus. DevKnife covers many of the small but frequent tasks that come up during development — formatting and converting data, testing APIs, inspecting tokens, working with timestamps, generating test values, and handling common encoding or hashing tasks. Each tool is designed to be quick to access, easy to use, and focused on doing one thing well. Tools included: Data - JSON Editor & Formatter - Converter (JSON, YAML, TOML, XML, CSV) - Encoder & Decoder (BASE64, URL, HTML) - JWT Decoder - Time Inspector Text tools - Regex Tester - Markdown Editor - Text Compare - Text Inspector Generators - Data Generator - Password Generator - Hasher (MD5, SHA1, SHA256, SHA512, CRC32) Network tools - HTTP Client - IP Location - Domain & IP WHOIS - Network Speed Test - IndexNow Graphics tools - Color Picker - SVG Editor - Tailwind Colors Why DevKnife: - Everything runs locally — your data never leaves your Mac - Native macOS app built for performance and reliability - Clean, focused UI designed for daily use - One app instead of many tabs DevKnife is built for developers who value speed, simplicity, and a distraction-free workflow.
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
Axios
React Navigation
Zustand
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.
