App Overview

Topo Maps icon

Topo Maps

Mappendix Limited · Navigation

* View over 70,000 Natural Resources Canada 1:50,000 and USGS 1:24,000 topographical maps on your iPhone or iPod touch

$19.99 · In-app purchases

PRICE
$19.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.3
128 ratings · Top 30%

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.

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.

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

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Topo Maps: map the core Navigation 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

Enhance offline map access and caching.

Assumption to check: Limited offline functionality

Validate with people who use this workflow before building.

Hypothesis 2

Implement advanced search algorithms for better results.

Assumption to check: Poor search accuracy

Validate with people who use this workflow before building.

Hypothesis 3

Optimize app performance for lower-end hardware.

Assumption to check: Slow performance on older devices

Validate with people who use this workflow before building.

Hypothesis 4

Offer more affordable pricing tiers or a one-time purchase option.

Assumption to check: High subscription cost

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

* View over 70,000 Natural Resources Canada 1:50,000 and USGS 1:24,000 topographical maps on your iPhone or iPod touch. * Ideal for hiking and other backcountry activities. * Map downloads are FREE! * More than 16 million maps downloaded so far! - iPad owners, please see the app "Topo Maps for iPad". * Users write: " I've bought all the topo map apps and I like this the best " " Scans are gorgeous ... the interface is exceptionally clean " " Downloading maps is easy and fast ... Map displays beautifully and zooms flawlessly " * Includes Canada (at 1:50,000), the contiguous US (at 1:24,000), Alaska (at 1:24,000 and 1:63,360), Hawaii, Puerto Rico and the U.S. Virgin Islands. * Locate the maps you need on the satellite view. To install a map, touch for about half a second. Touch again to view it. * Search by name for over a million towns, peaks, lakes, parks and other features. * No network connection is needed once the maps have been installed. * Mark waypoints, and import and export waypoint files in GPX, KML and CSV formats. * Touch the "current location" button to see where you are, and the compass button to align the map with the ground. * See coordinates in NAD27 or WGS84 degrees, degrees minutes and seconds, UTM, or MGRS formats. * Measure distances (miles, feet and km) and bearings (true and magnetic). The Maps: This app uses high-quality scans of the traditional USGS and NRCan topographic maps which have been the definitive resource for hikers and other backcountry users for many years. You can make the terrain stand out with hill shading, using simulated sunlight from the direction of your choice. In the U.S., this app does not use the new "US Topo" maps because they do not show hiking trails and lack other details: please see the web site for more details. Downloading: US maps are around 8 MB in size and download in a few seconds on a typical home broadband connection. Canadian maps are larger. Both cellular data and WiFi can be used, though WiFi is likely to be more reliable in most cases. - Do please visit https://topomapsapp.com/ for complete instructions, so that you don't miss any features. We have many ideas for additional features to add to future versions of this app; if you have ideas or other questions or comments, contact details can be found on the website, https://topomapsapp.com/. The website also has more screenshots and other information.

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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
React Native
Expo
React Navigation
Axios
Redux
MapView
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.