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
Mapstr – Save & Follow Places
Never lose a place – always know where to go
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
2,579 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 included17 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 Mapstr – Save & Follow Places: map the core Travel 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
Incorporate a recommendation algorithm based on user preferences.
Assumption to check: Users often find it difficult to discover new places.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more guided search experience with filters.
Assumption to check: Users may feel overwhelmed by too many options.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the review system with photos and more detailed feedback.
Assumption to check: The current review system lacks depth.
Validate with people who use this workflow before building.
Hypothesis 4
Streamline communication features for better user interaction.
Assumption to check: In-app messaging can be confusing.
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
Never lose a place – always know where to go. Mapstr allows you to save every spot you love anywhere in the world and shows trusted recommendations from friends, pros and influencers, right when you need them. —— A STORY YOU KNOW —— You spot an incredible bakery, hear rave reviews about a hidden jazz bar, promise you’ll remember… and two weeks later it’s gone. Screenshots multiply, notes pile up, Google stars blur together, anonymous reviews feel useless. Mapstr ends the chaos: one tap to save, tag, colour-code and—when friends ask—share a link they can open in any browser, no app required. —— SAVE, ORGANISE, (RE)DISCOVER —— * One-tap pins for cafés, shops, hikes—whatever catches your eye * Unlimited colours & tags to surface “Sushi”, “Sunset spot”, “For a date”, etc. in seconds * Import Google Maps, CSV or KML lists - if you don’t want to start from zero * Personal notes, ratings and photos; mark places “To try” or “Tried” to track memories * Follow the voices you trust: friends, favourite chefs, magazines, local creators * Merge their maps with yours to uncover hidden gems in 190 + countries * Share your map with a simple link, viewable in any browser, no app needed * Full control: flip your entire map to private, or hide individual pins on your public map * Private by default: your notes, ratings and pictures are only visible to your followers * Custom places you create (like this cute secret beach) stay only on your map and never enter mapstr’s global database * 100 % EU servers, GDPR-first, zero ad-tracking —— MAPSTR PLUS — 7-DAY FREE TRIAL, CANCEL ANYTIME —— Unlock extra power for map addicts and frequent travellers: * Unlimited places * Bulk edits for lightning-fast management * Smart Search: AI suggestions by mood, budget or diet to find any spot you want in the world * Real-time table filter: see restaurants with free tables for your date, time and party size, then book in two taps * Visits journal to relive every trip or every meal * Proximity alerts so you never walk past a saved gem again * Multi-map overlay for instant recs from the maps you follow * AI matching algorithm to get 100% personalized recommendations tailored on your tastes * Desktop web version for big-screen planning * Invitations to soft openings and special events (Paris-only for now) —— WHY MAPSTR? —— * Memory saver: pins replace screenshots and scattered notes forever * Personal compass: maps mirror your unique taste, not algorithmic hype * Trusted network: no anonymous reviews—only voices you choose * Fair freemium: core features stay free; go even further with personalized recommendations and map management with mapstr plus * Built in Europe: GDPR compliant, EU servers, no ads, no data sales —— PRIVACY & SUPPORT —— We never sell your data. Ever. Need help or have an idea? Email [email protected]—real humans answer fast. Download Mapstr today and defeat address amnesia while discovering new places from the people who matter to you most.
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
Axios
Async Storage
FastAPI
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.
