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
Simple cURL
Simple cURL is the essential tool for iOS developers and backend professionals who need to test, debug, and analyze API requests directly from their mobile device
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
1 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 included19 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 Simple cURL: 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
Add features for custom headers, authentication, and more complex requests.
Assumption to check: Limited functionality for advanced users
Validate with people who use this workflow before building.
Hypothesis 2
Implement a guided onboarding process for new users.
Assumption to check: Poor user experience due to lack of onboarding
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to save and reuse request templates.
Assumption to check: No way to save request templates
Validate with people who use this workflow before building.
Hypothesis 4
Enhance error handling to provide more informative messages.
Assumption to check: Basic error handling
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
Simple cURL is the essential tool for iOS developers and backend professionals who need to test, debug, and analyze API requests directly from their mobile device. With an intuitive interface and powerful features, it turns your iPhone or iPad into a portable API client. Key Features: Run complex cURL commands with support for custom headers Detailed response display including status code, headers, and body in readable format. Smart context menu to quickly copy specific parts of the response (full JSON, headers, or body) with a long tap on the response box. Dark mode and developer-optimized typography for extended reading. Who is this app for: iOS developers who need to test APIs in development environments (UAT, QA, Production). Backend engineers who want to verify endpoints from anywhere. Programming students learning about HTTP/REST protocols. DevOps professionals performing quick service monitoring. Why choose Simple cURL: Technical accuracy: Analyze every detail of the response, including hidden headers and status codes. Optimized for iOS: Seamless integration with clipboard, contextual keyboard, and Siri shortcuts. Guaranteed privacy: Zero tracking, your API data never leaves your device to be stored anywhere. Just copy a cURL from Charles proxy and paste into Simple cURL and see the responses
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
Axios
React Navigation
React Native Async Storage
TypeScript
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.
