MagVar vs CPD District Map
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MagVar
This navigation tool calculates magnetic variation, the difference between true and magnetic north, essential for plotting courses on maps. It's designed for pilots, sailors, cartographers, and anyone using maps and a compass.
- Magnetic variation calculation
- True vs. magnetic north difference
- Map overlay display
- Accurate for 2025-2029
- Declination and inclination calculation
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MagVar is targeted towards anyone interested in navigation. This includes, pilots of aircraft, captains of sea going vessels, cartographers, engineers and surveyors. Anyone who uses maps and a compass will find the declination calculation (also referred to magnetic variation) very useful. (Declination is the difference between true and magnetic north and used when plotting a course on a map.) MagVar calculates the magnetic flux density for any location on the Earth and then uses this data to calculate magnetic variation. The model is accurate for dates ranging from January 1, 2025 up through December 31, 2029. Using the model, the app calculates declination and inclination. As the user pans the map, the magnetic variation is calculated and graphically shown as a map overlay.
CPD District Map
This app provides an interactive map of Chicago, displaying district and beat boundaries in real-time. It helps users identify their current location, search by address, and access quick links for precinct calls and navigation. Additional layers like satellite and street view enhance the mapping experience.
- Real-time location display
- District/Beat boundary visualization
- Address search functionality
- Quick links to precinct and navigation
- Satellite and street view layers
- Saves last searched address
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Interactive map of Chicago showing all District and District Beat boundaries. Features Include: •Know your location...Displays and/or speaks your current location in realtime. •Displays current District/Beat. •Search by address. •Quick links to: Call Precinct, My Location, Navigate to District, Official District website. •Layers: Beat Borders, District Borders, Satellite and Street View. •Associate additional phone numbers with District. •Saves last searched address. Source data obtained from https://data.cityofchicago.org/. Data curation by application developer which includes but not limited to:\n\nMap visualization (source is in CSV/Text format), border and fill colors, association address with District/Beat, etc.
Screenshots
Verdict
The clearest difference is price: CPD District Map at Free against MagVar's $0.99. CPD District Map also leads on update cadence (every 2 days vs every 23 months) and iOS requirement (15.0 vs 17.6). MagVar's advantage is ads (none vs shown) and chart position (#142 vs unranked). On rating, ratings volume, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
CPD District Map is free to download; MagVar costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for MagVar against 5.0 for CPD District Map. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
MagVar ships an update every 23 months, CPD District Map every 2 days. Both last shipped on October 24, 2026.
| Parameter | MagVar | CPD District Map |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 23 months | Every 2 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Best chart rank | #142 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Robert Walker | JC Accounting & Innovative Technologies, Inc |
Customer experience
MagVar
CPD District Map
In-app purchases
MagVar
No in-app purchases
CPD District Map
No in-app purchases
