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
Dev Utils
Dev Utils is the ultimate toolkit for mobile developers
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
104 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Dev Utils: 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
Expand tool offerings or allow user submissions.
Assumption to check: Limited selection of tools compared to alternatives
Validate with people who use this workflow before building.
Hypothesis 2
Standardize UI components across all tools for consistency.
Assumption to check: Inconsistent UI across different tools
Validate with people who use this workflow before building.
Hypothesis 3
Introduce more features in premium tier to attract users.
Assumption to check: Lack of advanced features in free version
Validate with people who use this workflow before building.
Hypothesis 4
Optimize performance and loading times for better user experience.
Assumption to check: Slow loading times for heavier tools
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
Dev Utils is the ultimate toolkit for mobile developers. With features designed to streamline your workflow and increase productivity, Dev Utils is the essential companion for building amazing mobile apps. Stay Up-to-Date with the Latest Releases and Betas - Get notified about the latest betas and full releases of Apple's operating systems (iOS, iPadOS, watchOS, and tvOS) and Xcode. - Easily check release notes for the latest Xcode. See the macOS requirements and view included SDKs for iOS, macOS, watchOS, and tvOS. - Stay informed with the latest developer news and important information about App Store Connect, TestFlight, and more. Ensure Your App is Accessible to All Users - Compare system fonts and colors with adjustable sizing and dark mode support. Get Device Information Quickly and Easily - Check which versions of Apple's operating systems (iOS, iPadOS, watchOS, and tvOS) are currently supported on any device. - Quickly view your device's type, storage, connectivity, cameras, and more. Easily share device info with others. Additional Tools - Quickly search and learn about HTTP status codes with a comprehensive reference guide. Customize Your Experience - Enjoy light and dark themes and customize your home screen with alternate app icons. Download Dev Utils now and elevate your mobile development to the next level!
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
Zustand
React Native Reanimated
BUILD KIT DIFFICULTY
Starter
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.
