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
Banana API – cURL Testing Tool
A simple yet powerful client for testing Google’s Imagen and Nano Banana APIs
$2.99 · In-app purchases
PRICE
$2.99
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 included15 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 Banana API – cURL Testing Tool: 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
Implement better formatting and error handling for responses.
Assumption to check: Users often struggle with complex API responses
Validate with people who use this workflow before building.
Hypothesis 2
Add features for bulk header management, like importing/exporting.
Assumption to check: Difficulty in managing multiple headers efficiently
Validate with people who use this workflow before building.
Hypothesis 3
Support additional features like file uploads for POST requests.
Assumption to check: Limited functionality for specific HTTP methods
Validate with people who use this workflow before building.
Hypothesis 4
Introduce sharing options for requests and responses.
Assumption to check: Lack of collaboration 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
A simple yet powerful client for testing Google’s Imagen and Nano Banana APIs. Whether you’re a beginner developer, marketer, or vibe-coder, Banana API makes experimenting with image generation easy and fun. Write a prompt, select aspect ratio and parameters, while Banana API writes the code for you. Submit the API call and review the responses, keep a log of all your API calls and images generated. With Banana API you can: - Enter your own Google Cloud API key to generate unlimited images. - Preview and send API calls instantly with a clean, easy-to-use interface. - Experiment with prompts, aspect ratios, sizes, and generation settings. - View and review your full cURL requests and responses for learning and debugging. - Save or share your generated AI images directly from the app. IMPORTANT INFORMATION This is a client app only. Banana API does not include an API key or access credits. You must provide your own valid Google Cloud API key. Charges may apply. Usage of Google Imagen and Nano Banana through this app will incur costs billed directly by Google Cloud, based on your account and API usage. Stable connection required. A strong and reliable Wi-Fi or mobile data connection is necessary for best performance. No subscription, no hidden fees. Pay once and keep using the app as long as you have your own API key. WHO IS IT FOR? Banana API is designed for: -Developers who want to test APIs quickly from their iPhone. -Marketers and creatives exploring AI-generated images for campaigns. -Students, hobbyists, and low-code makers who want to learn by experimenting. Banana API makes testing AI image APIs approachable, portable, and fun. All while keeping you in control.
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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
Zustand
React Navigation
React Native Gesture Handler
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.
