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
BerryFilm - Korean Style Cam
Hi, I’m Berry, a filter creator from South Korea.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
60 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 included18 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 BerryFilm - Korean Style Cam: 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 advanced editing tools and filters.
Assumption to check: Limited editing features compared to professional apps.
Validate with people who use this workflow before building.
Hypothesis 2
Implement batch editing options for efficiency.
Assumption to check: No batch processing for multiple photos.
Validate with people who use this workflow before building.
Hypothesis 3
Consider a one-time purchase option alongside subscriptions.
Assumption to check: Subscription model may deter users.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate cloud backup for photos and edits.
Assumption to check: Lack of cloud storage for backups.
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
Hi, I’m Berry, a filter creator from South Korea. Some of you may know me from Instagram as @berryveryloveyou. Many of the filters I once shared on social media are now gone— but I wanted to preserve the soft tones I’ve created over the past 5 years. That’s why I built this space: BerryFilm. New filters will be added regularly. Natural skin tone effects and soft light features are also in the works. Please enjoy the filters I’ve poured my heart into. -- Features - Soft and subtle Korean-style filters From airy milk tones to cool, warm, and vintage moods— you’ll find filters that bring out your natural atmosphere. - Photos and videos in your favorite tone Transform your gallery into a soft, aesthetic feed with gentle color correction and minimalist touch. - Simple, quiet, and easy to use Apply filters with one tap, save favorites, and shoot with a silent shutter—anytime, anywhere. - New filters every month Always something new, designed to match the season or your mood. - Built with feedback from real users We’re constantly improving the app through your suggestions. -- Recommended For - Fans of Berry’s Instagram filters - Anyone looking for soft, natural Korean-style filters - Users who love subtle selfies without heavy edits - Those who enjoy discovering new filters each month -- Included Filters Featuring over 40 carefully designed filters like milk, iPhone 7, butter, cool, warm, and blossom — with more coming soon. -- Contact & Sharing Tag @seesun.app on Instagram to share your photos. For questions or feedback, feel free to DM or email us. Email: [email protected] Instagram: @berryfilm.app
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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.
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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.
