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
Snap Markup - Annotation Tool
Snap Markup — Photo Markup & Editor
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
3,525 ratings · Top 15%
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/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Snap Markup - Annotation Tool: map the core Utilities 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
Expand editing capabilities with more tools like shapes and text styles.
Assumption to check: Limited editing features compared to desktop tools.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify UI by grouping similar features and adding a tutorial.
Assumption to check: User interface can feel cluttered for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Implement cloud sync features for user convenience.
Assumption to check: No cloud storage options for saving annotations.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize image handling and processing for better stability.
Assumption to check: Occasional crashes when handling large images.
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
Snap Markup — Photo Markup & Editor Turn any photo into a polished, annotated image in seconds. Mark up screenshots, documents, receipts, real estate, and snapshots with on-device AI, pro editing tools, and effortless sharing — all in one app. ALL-IN-ONE MARKUP Crop, rotate, draw, add text, stickers, and overlays from one toolbar. Reorder tools in Settings so your favourites are always one tap away. DOCUMENT SCANNER Scan multi-page documents with auto edge detection and straightening. Export as a clean image or searchable PDF. COLLAGE MAKER Combine multiple photos into beautiful grid layouts with adjustable spacing, borders, and ratios. GIF MAKER Turn photos or video clips into animated GIFs. Add text, stickers, and overlays, then export a ready-to-share loop. BATCH RESIZE & EXPORT Resize multiple photos at once. Set custom dimensions and DPI for print or web, and export to PNG, JPG, or HEIC. PHOTO SPLITTER Slice an image into a grid for seamless social posts and carousels. SMART CROP & ROTATE On-device AI detects documents and faces and suggests the perfect crop. Free, fixed-ratio, and shape crops (rectangle, circle, star, triangle). Rotate, flip, or auto-straighten skewed documents. ADJUST & AUTO ENHANCE Fine-tune brightness, contrast, saturation, and exposure with live sliders, or tap Auto Enhance. Cinematic filters in one tap. BACKGROUND BLUR & COLOUR Powered by Apple Vision AI — blur the background for a portrait look, or swap it for any solid colour. ANNOTATE LIKE A PRO Arrows, shapes, lines, freehand pen, curves, and numbered step callouts. Customise stroke colour, thickness, and opacity. Annotate large images without cropping first. HIGHLIGHT & HIDE Spotlight key details, or pixelate sensitive info — faces, addresses, account numbers — before sharing. TEXT, STICKERS & OVERLAYS Full text styling with drag, pinch, and rotate. Emoji and shape stickers, plus photo overlays — long-press to remove a background on device. MORE TOOLS Date & location stamp, measurement ruler, speech bubbles, OCR text extraction, code scanner, translate, signature, watermark, frame, collage, photo stitch, webpage & map capture, blank canvas, and searchable PDF export. SHARE WITHOUT FRICTION Save to Photos or Files, print, copy, set as wallpaper, or share anywhere. Export lossless PNG, high-quality JPG, or HEIC. Generate custom PDFs with your choice of name, quality, and orientation. 76 LANGUAGES & THEMES Fully localised in 76 languages. Light, Dark, and Auto themes. PRIVACY FIRST All AI processing runs on device. Your photos never leave your iPhone or iPad. Feedback or suggestions? Contact us at [email protected] — we'd love to hear from you.
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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
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.
