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.
Tidy up your photo library
$3.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Cully - Photo Cleaner: 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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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
Assumption to check: Limited editing options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Cluttered UI with too many options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Performance issues with large photo files
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Tidy up your photo library. Day by day. Over 20,000 photos and no idea where to start? Duplicates, blurry shots, screenshots from 2019? Cully turns that into something you can actually do. The idea is simple: choose a random date and browse your photos from that day — from all years at once. A different slice of your life, every session. Keep the best, delete the rest. Five minutes a day, and your library feels lighter. HOW IT WORKS • Cully suggests a day. You instantly see all photos from that day, across all years. Not in the mood? Roll again or pick a date yourself. • Scroll through your grid. Tap to select, pinch to zoom for a closer look. • iOS confirms every deletion. Photos go to Recently Deleted and can be restored for 30 days. FEATURES • Privacy first: No account, no cloud, no tracking. Your photos never leave your device. • Smart random: Prefers days you haven't sorted yet. • Albums: Send a selection straight to an album instead of deleting it. • Finish a day: You decide when a day is done. Sorted days show up in your stats and calendar. • Share originals: Long-press any photo to share with full quality. • Live Photos & videos: Play them right in the grid. • Date picker: Pick a specific day — sorted days are marked. • Your stats: See how many photos you've deleted and how much storage you've freed up. • Gentle reminders: Optional notifications to help you stay on track. • Lock screen widget: Your deletion stats at a glance. • iCloud sync: Stats and settings across all your devices. • iPhone, iPad and Mac: Native apps for every screen, stats and settings in sync via iCloud. • Quick actions: Launch directly from your home screen. • Pinch to zoom: Zoom into any photo for a better decision. WHY CULLY? In photography, "to cull" means going through your shots and keeping only the best. We built Cully because we had the same problem: a photo library that kept growing, with no good way to clean it up. No account. No cloud. No AI. No analytics. No subscription. Just open it and get started. Made in Berlin.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.