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
Oak Viewer
Oak Viewer is a quiet, intentional photo viewer designed for art collectors, photographers, and image lovers.
$9.99 · In-app purchases
PRICE
$9.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Oak Viewer: 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
Incorporate more advanced editing tools like AI background removal and layer support.
Assumption to check: Limited editing features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement cloud backup for user edits and photos.
Assumption to check: No cloud backup options
Validate with people who use this workflow before building.
Hypothesis 3
Add features for sharing edits to social media or with friends.
Assumption to check: No community features or sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Offer more flexible pricing tiers or a free trial to attract users.
Assumption to check: High subscription price
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
Oak Viewer is a quiet, intentional photo viewer designed for art collectors, photographers, and image lovers. Discover artwork online, download gallery ZIP files directly in the built-in browser, and explore your images in a calm, distraction-free space. Swipe smoothly between pieces, inspect fine details, and rate your favorites — all while keeping your collection private and fully on-device. Oak Viewer is designed to feel more like a personal gallery than a utility. FULL-SCREEN VIEWING Experience your images the way they were meant to be seen. Swipe fluidly between photos, zoom down to pixel level, and explore every detail with intuitive gestures. A clean interface keeps the focus on your images while still providing quick access to ratings, metadata, and tools when you need them. Also supports videos, PDFs, and text files — all in one library. PRIVATE, ON-DEVICE LIBRARY Your collection stays on your device. No accounts. No cloud uploads. Just your collection. Optional biometric app lock adds an extra layer of protection. DISCOVER & IMPORT COLLECTIONS Browse art and photography sites with the built-in private browser. • Long-press to save images directly • Import entire ZIP galleries • Batch import collections Build your collection effortlessly. ORGANIZE YOUR GALLERY Create unlimited folders and nested albums. Use Smart Folders to automatically gather images by rating — keeping your best work always within reach. Pin favorites for instant access. RATE & CURATE Quickly review your collection with a fluid 1–5 star rating system. Long-press and slide to rate instantly while browsing — perfect for large collections. IMAGE INSIGHTS Dive deeper into every image: • Full EXIF metadata • Filename and resolution details • Real-time RGB and luminance histograms • Highlight and shadow clipping indicators • Precise zoom and panning feedback WIDGETS & QUICK ACCESS Bring your collection to your Home Screen: • Picture Frame widget rotates favorite folders • Resume widget jumps back into your last session DESIGNED YOUR WAY Customize your experience: • Themes and custom app icons • Custom library backgrounds • Adjustable grid density and spacing • Slideshow viewing • Keyboard shortcuts on iPad • Configurable trash policies Whether you’re collecting digital art, studying photography, or simply enjoying images at your own pace, Oak Viewer creates a private space where your collection can breathe.
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
Zustand
react-native-reanimated
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.
