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
Timestamp Camera Pro
Add timestamp watermark to camera in real time.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
607 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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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 Timestamp Camera Pro: 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
Provide more font styles, colors, and positions for overlays.
Assumption to check: Limited customization options for timestamps
Validate with people who use this workflow before building.
Hypothesis 2
Implement batch processing for media and sharing capabilities.
Assumption to check: No batch editing or sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Integrate cloud storage for saving and accessing media.
Assumption to check: Poor cloud backup options
Validate with people who use this workflow before building.
Hypothesis 4
Include basic video editing tools such as trimming and effects.
Assumption to check: Lack of video editing features
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
Add timestamp watermark to camera in real time. • Automatically insert current time and address when taking photo or video in real time, you can change time format or select the address around easily. Timestamp Camera is the only App that can record video with the time watermark accurate to millisecond(0.001 second). - Support 81 timestamp formats. - Support change font, font color, font size. - Support set timestamp in 6 positions: top left, top center, top right, bottom left, bottom center, bottom right. - Support auto add address and GPS. - Support input and display custom text on camera. - Support input and display tag on camera and insert to the Exif. - Support change opacity of text and text background. - Support four text margin modes: no margin, one line margin, half line margin, suitable for printing • Support display altitude and speed. • Support display map on the camera. • Support display compass on the camera. • Support import watermark logo image to display on the camera. • Support change photo resolution, support the maximum resolution supported by the camera. • Support change video resolution(540P, 720P, 1080P, 4K) and fps(30fps, 60fps). • Support record video without audio. • Support pause and continue record fragments to one video. • Support timer to take picture (3, 5, 10 seconds with count down). • Has 4 modes. "Video", "Square", "Timelapse" support record video and capture photo. "Photo" mode only support capture photo with special optimization. • All the effects are real-time and can be used when taking photo or video. • Support change effect, toggle camera when recording. • Support "Battery saver mode", the brightness of screen can be changed when turn it on. • Support show 3x3 grid. • Support import photo as a virtual camera. • Support portrait and landscape. • Support both iPad and iPhone. • Photo and Video will be saved to Camera roll. Please mail us [email protected] if you have any problem or suggestions. Thank 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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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.
