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
KRUU
With the KRUU App, the best moments from your celebration stay in one place
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
1,817 ratings · Top 5%
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 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 KRUU: map the core Photo & Video 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 more free filters and editing tools to attract users.
Assumption to check: Limited free features compared to premium options
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image processing for faster editing.
Assumption to check: Slow performance with high-resolution images
Validate with people who use this workflow before building.
Hypothesis 3
Implement cloud storage for user edits to prevent data loss.
Assumption to check: Lack of cloud backup for edits
Validate with people who use this workflow before building.
Hypothesis 4
Provide guided steps or templates for users to create custom filters easily.
Assumption to check: Complexity in creating custom filters
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
With the KRUU App, the best moments from your celebration stay in one place. Easily discover, download, like, and comment on your photos in a shared gallery. The pictures from your KRUU Photo Booth are also automatically transferred to the app after your approval. New: With the Audio Guestbook, you can listen to your guests’ voicemails again at any time. This way, not only pictures stay with you, but also personal words, lovely wishes, and funny messages. WHAT THE KRUU APP OFFERS YOU: Shared photo gallery: Collect the best photos from your event in a clear feed and share them with family, friends, and guests. KRUU Photo Booth pictures included: Your photo booth pictures are transferred to the app free of charge and can be viewed, downloaded, and shared there. Audio Guestbook: Listen to your guests’ voicemails again and again, even after the celebration. Likes & comments: Interact with your favorite pictures and relive the best moments together. Easy admin area: Manage your event and decide who you share your memories with. Free to use: The KRUU App is free and contains no in-app purchases. HOW IT WORKS: Download the KRUU App and join an event or create a new one. Invite guests, collect your photos in one place, and discover all pictures in the app after the upload. There, you can like, comment, and download them. WHY KEEP THE APP? With the KRUU App, your pictures and voicemails are always within reach, even after the celebration. You do not have to search through your entire phone and can view or listen to your shared memories again at any time. You can also use the app for future celebrations with a KRUU Photo Booth. DATA PROTECTION Your photos are only visible to you and your invited guests. They are protected according to high data protection standards and stored on German servers. WHO IS KRUU? Since 2016, more than 300,000 photo booth customers have trusted KRUU. We are Europe’s market leader in photo booth rentals and work with over 70 team members in Bad Friedrichshall near Heilbronn, Germany. Do you have questions or feedback? Feel free to contact us at [email protected]
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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
Supabase
react-navigation
react-query
expo-image-picker
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.
