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
Retro — Photos with Friends
Retro is a radical new idea: a social app where you share real photos with real friends.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
15,063 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Retro — Photos with Friends: 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
Implement advanced editing tools like AI background removal and batch editing.
Assumption to check: Limited editing features compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify sharing with direct integration to popular platforms.
Assumption to check: Difficulty in sharing photos directly to social media.
Validate with people who use this workflow before building.
Hypothesis 3
Streamline the interface for better usability.
Assumption to check: Cluttered user interface with too many options.
Validate with people who use this workflow before building.
Hypothesis 4
Add cloud backup options for saved edits and projects.
Assumption to check: No cloud backup for user edits.
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
Retro is a radical new idea: a social app where you share real photos with real friends. It's the app that we wanted for our own family and friends, and for you, it should feel like a breath of fresh air. Retro is a weekly photo journal that (1) brings you closer to the people you actually care about and (2) helps you appreciate your own life - all without the distractions and pressure of big social media. So dust off those photos that are just sitting in your camera roll and spread some joy in the world. Say hi to us at [email protected] And if you’re still reading, here are some reasons to try Retro: - EASY TO START: Start by choosing photos you’ve already taken and backfill the weeks on your profile with the photos and videos you want to remember. - NO PRESSURE: Everything was designed with your comfort in mind. Your friend list is private. Likes on your posts are private. No captions required. Update any part of your profile anytime. - PRINT & SHIP POSTCARDS: Spread some joy through snail mail by printing your photo as a high quality postcard and sending it to anyone in the world via USPS first class. - MONTHLY RECAPS: Create a beautiful photo collage or video slideshow from the photos you’ve shared from the week, month, or year. Then share via text or Instagram in a tap. - GROUP ALBUMS: Start a private album and drop the link in your group chat to collect and share photos after events. Perfect for parties, projects, friends, parents, and couples. - GROUP MESSAGING: Retro is now an all-in-one home for groups large and small, with the ability to share photos, videos, and notes privately in Albums and start group chats in Messages. - HOME SCREEN WIDGETS: See the newest posts from friends or time hop back to your own memories with our new widgets. We've poured our hearts into this, and we hope you love it. Terms of use: https://retro.app/terms
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.
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BUILD KIT DIFFICULTY
Expert
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.
