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
Stacheify - Mustache face app
It's a mustache mirror! Just hold up the app and go MUSTACHE CRAZY trying tons of different "follicle-accurate" stache styles
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
293 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 included18 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 Stacheify - Mustache face app: 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 a wider variety of mustaches and allow users to create custom mustaches.
Assumption to check: Limited mustache options and customization
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image processing for smoother performance.
Assumption to check: Inconsistent performance on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Enable direct sharing to social media platforms.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Improve user onboarding to highlight premium features and their value.
Assumption to check: Premium features are not clearly communicated
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
It's a mustache mirror! Just hold up the app and go MUSTACHE CRAZY trying tons of different "follicle-accurate" stache styles. A wise person once said, “If you can’t grow a mustache, make sure your personality has one”. But with Stacheify EVERYONE can have a mustache… personality, smershonality! Choose your hair color for ultimate realism and try novelty mustaches from "Stubble" to "Walrus"! From the makers of Beardify, Zombify, and Oldify 2! FEATURES: * Record LIVE videos of yourself and friends with staches * Add mustaches to any photo in your photo library * Choose a stache color to match your hair! * Combine effects from Fatify, Oldify, Beardify, and more! * Share photos through Instagram, Twitter, Facebook. MMS, YouTube, and even Email(if you're into that sort of thing). CHOOSE THE RIGHT STACHE: The Handlebar - Instantly become more attractive The Petite Handlebar - More subtle, but no less distinguished The Chevron - A stache of legend The Horseshoe - Or "biker moustache" also worn by Hulk Hogan The English - Truly, a gentleman's stache The Dali - For the eccentrics, the trend-setters, the odd-balls... The Pencil - also known as a Mouth-brow, this stache is reserved for the most meticulous stache-stylists The Toothbrush - Worn by the entertainment genius, Charlie Chaplin The Walrus - Show everyone you're serious about your stache-statement The Fu Manchu - The facial hair of choice for villains throughout the ages The Bat Stache - Become the mustachioed crusader The Hungarian - Big, bushy and completely under control. Break out the stache wax! ADD BEARDS: - Get Beardify to add stache/beard combos right inside Stacheify! SHARE WITH FRIENDS -Share videos and photos via MMS, YouTube, Facebook, Twitter, Instagram, and Email. -Give your friends the gift of facial hair! Thank us later. Follow along with us on Instagram at @apptly and share your most dashing stache creations using #stacheify. Note: Stacheify is meant to make you laugh and/or giggle, and should be used purely for entertainment. Enjoy!
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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.
SUGGESTED BUILD STACK
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BUILD KIT DIFFICULTY
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.
