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
Guernika
Guernika is the ultimate tool for generating stunning images based on text prompts, creating variations of initial images, and inpainting images.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
7 ratings · Top 30%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Guernika: map the core Graphics & Design workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
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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 advanced design functionalities like layers and filters.
Assumption to check: Limited features compared to desktop design tools
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance for smoother drawing experience.
Assumption to check: Performance issues on low-end devices
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate social sharing features for designs.
Assumption to check: Limited sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Simplify pricing structure with clearer benefits.
Assumption to check: Subscription fatigue due to multiple tiers
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
Guernika is the ultimate tool for generating stunning images based on text prompts, creating variations of initial images, and inpainting images. With Guernika, you can easily create high-quality, unique images using state-of-the-art Stable Diffusion models. Load your favorite model, provide a text prompt and let Guernika do the rest. Additionally, you can use Guernika to generate variations of an initial image, giving you endless creative possibilities. And when you need to update or repair an image, Guernika's inpainting feature allows you to seamlessly blend the changes into the rest of the image. Guernika utilizes CoreML to fully take advantage of your Mac's hardware. This allows for faster and more efficient processing, resulting in smoother and more seamless performance. So not only will you be able to create beautiful images with ease, you'll be able to do so with lightning-fast speed. Whether you're a professional artist or just looking for a fun new way to create and edit images, Guernika has something for everyone. Download it now and start exploring your creative potential!
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
@supabase/supabase-js
Zustand
BUILD KIT DIFFICULTY
Advanced
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.
