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
HeyCalculator Pro - Best Private Photo Vault
The Best and Most private photo and video App for iPhone/iPad/iPod touch
$0.99 · In-app purchases
PRICE
$0.99
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 HeyCalculator Pro - Best Private Photo Vault: 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
Add advanced features like batch editing and organization.
Assumption to check: Limited photo management features
Validate with people who use this workflow before building.
Hypothesis 2
Enhance UI with clearer navigation and modern design.
Assumption to check: User interface is not user-friendly
Validate with people who use this workflow before building.
Hypothesis 3
Implement cloud storage options for user convenience.
Assumption to check: Lack of cloud backup options
Validate with people who use this workflow before building.
Hypothesis 4
Optimize loading times and app responsiveness.
Assumption to check: Inconsistent performance
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
The Best and Most private photo and video App for iPhone/iPad/iPod touch. With it, you can lock and manage your private photos, videos and other files very easily! HeyCalculator provides multiple security mechanisms, and perfectly keeps your privacy away from peeping eyes. What everyone can see is just an ordinary calculator. No need to worry about people accidentally stumbling across your 'SPECIAL' photos, videos, files and more. Some of the features: 1) Convenience: √ Fast iTunes File Sharing Sync √ Easy WiFi Transfer √ Import from Photo App(Camera Roll) √ In App Camera 2) Security: √ Password is needed when access photo&video privacy √ Hidden feature - Special way to make files&folders invisible √ Calculator style UI to deceive the intruder 3) More than you can imagine: √ Use as a normal calculator App √ Password lock & Touch ID √ More protections to keep people away from your private folders √ Send files via email √ Send photos via MMS √ Export photos/videos to photo library √ Export files/folders to computer √ Wi-Fi web access for download and upload. Support viewing files on browser and uploading multiple files at a time √ Image gallery √ Slideshow √ High-efficient file manager √ In App Photo Editor √ In App Video Player √ Support multiple formats -- Image:jpg,jpeg,gif,png,bmp,tiff,tif,ico,cur -- mov,mp4,m4v,3gp * * * * * * All your photos stored in private Photo vault are 100% private. Your photos are only stored on your device and are never uploaded to our servers.
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
React Navigation
Async Storage
Expo Camera
Supabase
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.
