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
Typewriter FX Photo Filter
Turn your photos into nostalgic typographical art!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 ratings · Top 5%
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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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 Typewriter FX Photo Filter: map the core Graphics & Design 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
Offer a wider variety of unique filters and customization options.
Assumption to check: Limited filter options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Enable users to apply filters to multiple photos at once.
Assumption to check: No batch processing for multiple photos
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social sharing options to enhance user engagement and visibility.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create and share their own filters.
Assumption to check: No user-generated content options
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
Turn your photos into nostalgic typographical art! As seen in the YouTube series "App Underdog!" Transform your favorite portraits into entrancing, retro mosaics of characters meticulously captured from real vintage typewriters from the 1930s to 1980s. Typewriter FX is a photo filter app unlike any other... ADJUSTABLE AMBIANCE Fine-tune the final result with a light or dark effect to match your mood. BEYOND COURIER & MENLO When you make a printout or image, you can choose from 11 authentic, distinctive typefaces. AUTHENTIC VINTAGE TYPEWRITERS Each character is captured from real typewriters, preserving their imperfections and quirks. PERFECT FOR PORTRAITS Typewriter FX reveals the personality of your pets and loved ones in a tasteful, nostalgic way. PROTECTS YOUR PRIVACY Lightning-fast converter runs completely on your iPhone or iPad and needs access to only one photo at a time. Install Typewriter FX today and share unique keepsakes with family and friends!
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
expo-image-picker
react-navigation
expo-file-system
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.
