App Overview

Compass & Altimeter icon

Compass & Altimeter

明力 王 · Navigation

Compass GPS is an application for measuring geographical orientation

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.6
2,382 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 included16 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 Compass & Altimeter: 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

Add route planning and integration with maps.

Assumption to check: Limited features compared to full navigation apps

Validate with people who use this workflow before building.

Hypothesis 2

Implement a guided calibration process.

Assumption to check: Calibration can be confusing for users

Validate with people who use this workflow before building.

Hypothesis 3

Allow users to save calibration settings for offline use.

Assumption to check: No offline functionality

Validate with people who use this workflow before building.

Hypothesis 4

Provide an ad-free experience for premium users.

Assumption to check: Ads can be intrusive

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

Compass GPS is an application for measuring geographical orientation. It also supports many data displays, including altitude, longitude and latitude, weather, water boiling point, air data, magnetic field data and other information. It can help you find accurate directions, save location records and become an excellent guidance assistant for your travel. Key Features: – Experience a very good compass – Display longitude, latitude, altitude, weather, etc – Convenient location recording function – GPS real-time velocity measurement Unlimited access to subscriptions: – Unlock more GEO data – Accurate GPS speed measurement – Remove all Ads – You can subscribe to get unlimited access to all app features – Subscriptions are billed monthly or yearly at the rate based on the subscription plan – Payment will be charged to iTunes Account at confirmation of purchase – You can unsubscribe or try for free in iTunes settings – Subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period – Account will be charged for renewal within 24 hours prior to the end of the current period – Any unused portion of the free trial will be forfeited when the user purchases a subscription Privacy Policy: https://sites.google.com/view/privacypolicyforcompass Terms of Use: https://sites.google.com/view/serviceagreementcompass

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
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BUILD KIT DIFFICULTY
Starter

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.