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
Over 40
Flashlight and Magnifier in One App PLUS a Tip Calculator
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
27 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 included14 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 Over 40: 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
Allow users to customize tool settings and preferences more.
Assumption to check: Limited features for customization
Validate with people who use this workflow before building.
Hypothesis 2
Standardize UI components for better coherence.
Assumption to check: Inconsistent user experience across tools
Validate with people who use this workflow before building.
Hypothesis 3
Integrate sharing features to share results or tips.
Assumption to check: Lack of social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Enhance onboarding with tutorials or walkthroughs for new users.
Assumption to check: Minimal onboarding process
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
Flashlight and Magnifier in One App PLUS a Tip Calculator √ Featured by Apple in iTunes throughout the world! √ Easily see menus and receipts in dark restaurants √ Use the FLASHLIGHT to find stuff under the seat in your car √ Use the NEW Freeze Frame feature to inspect your stuff. √ VANITY MIRROR to check yourself out! √ MAGNIFY from 1x to 20x √ This version includes unobtrusive ads that you can disable through a nominal In App Purchase ***** Recent Rave Reviews From Around the World ***** √ Excellent * Very very good * Brilliant * Best (USA) √ One great app! - This app is amazing and I use it more than my reading glasses! I give it a five out of five and recommend it to everyone! Even those under 40! (USA) √ Magic - Very helpful app and no bugs found yet (UK) √ Good - Good program (Saudia Arabia) √ Feine App - Gefällt (Germany) √ Over forties - Brilliant for my old eyes...!!! (UK) √ J'adore - Trop génial très pratique pour moi (Canada) √ Ottima - Funziona molto bene, utile, fa quel che dice (Italy) √ THE BEST - I was looking for flashlight apps and came across this one FREE I couldn't believe my eyes downloaded right away and works perfect THANK YOU (USA) √ Five stars - This app is not only for over 40, it's for everyone. Makes me feel safe when I need light too !!! (USA) √ Hit of the party - Whenever I show the app everyone loves it and thanks me (USA) √ Works great and it can be used full screen, just go to settings and select contact lens mode. (USA) √ Now I don't have to read the whole menu out loud to my husband when we go out to dinner. I just open this app and hand him my phone. Not that I ever need to use it! Yeah, right. I love it! (USA) √ I have recommended this app to a number of people. I like the magnifier but use the flashlight most every day. (USA) The flash is used to light up the image when you touch the 'flashlight' icon on screen. It is only on when you want it on. With that said, continued use of the flash may dramatically decrease battery life. This app is primarily financed through the use of Apple's iAd feature. If you like this app and see something of interest in the ad area, please check it out. By doing so, you help us keep our lights on!
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
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BUILD KIT DIFFICULTY
Starter
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.
