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
EXIFer Pro: GPS Timestamp EXIF
EXIFer Pro is a timestamped EXIF and GPS camera built for evidence capture, with metadata you can trust.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
2 ratings · Below Average
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 included16 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 EXIFer Pro: GPS Timestamp EXIF: 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
Include advanced editing options like batch editing and custom filters.
Assumption to check: Limited editing features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Focus on user feedback to improve UI/UX.
Assumption to check: Average user rating indicating dissatisfaction
Validate with people who use this workflow before building.
Hypothesis 3
Optimize app performance for faster loading times.
Assumption to check: Poor performance with large photo libraries
Validate with people who use this workflow before building.
Hypothesis 4
Implement cloud storage for user edits and backups.
Assumption to check: No cloud backup 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
EXIFer Pro is a timestamped EXIF and GPS camera built for evidence capture, with metadata you can trust. Capture photos or long-press video with on-frame date/time, GPS coordinates, optional address, map overlay snapshot, speed overlay (mph/kmh), and a custom text watermark. Data you can trust: - Every capture writes EXIF/TIFF/GPS metadata and a SHA-256 manifest with sidecars (videos get human-readable sidecars). - Verify originality by hashing files or dropping files + manifest into the online hash verifier: - https://midstateagencylc.masoftware.workers.dev/exifer-verifier Field-ready camera controls: - Pinch or slider zoom 1x-5x - Flash/torch/strobe, front/back switch - Volume-button shutter/record - Draggable/collapsible minimap, grid, level Gallery tools: - Browse, select, delete - Save to Photos - Share/export with toasts and cleanup of missing items Built for real-world, professional use by Investigators, Process Servers, Security Personnel, Motorists, Delivery Drivers, Inspectors, Landlords, Tenants, and Construction and Tradesmen of all kinds.
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
Zustand
React Navigation
@react-native-community/datetimepicker
expo-image-picker
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.
