# Dsky vs C

The clearest difference is in-app purchases: Dsky at none against C's 11. Dsky also leads on review sentiment (86% vs 51%) and iOS requirement (8.0 vs 15.1). C's advantage is update cadence (every 6 weeks vs every 32 months) and ratings volume (2.3K vs 11). On price, rating and ads there is nothing between them.

Both are free to download. C sells 10 in-app purchases, starting at $1.99 per month. Dsky asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Dsky against 4.5 for C. That said, the two scores are not equally well evidenced: C has 2.3K ratings behind it against 11, so its average is the more settled of the two. Written reviews are what separate them: 86% of Dsky's written reviews are positive against 51% of C's.

Dsky ships an update every 32 months, C every 6 weeks. The most recent releases landed on September 14, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Dsky | C |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (11 ratings)](https://appshunter.io/ios/app/dsky/id567387896/reviews)** | [4.5 (2.3K ratings)](https://appshunter.io/ios/app/c-map-boating/id967289980/reviews) |
| Number of ratings | 11 | **2.3K** |
| Positive reviews | **85.7% of reviews** | 51.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 6 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#95** |
| Size | 9 MB | 169 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [AirSpayce](https://appshunter.io/developer/564666685) | [Navico Norway AS](https://appshunter.io/developer/842162153) |

## What reviewers say

### Dsky

[App page](https://appshunter.io/ios/app/dsky/id567387896)

Experience the Apollo Guidance Computer DSKY interface on your iPad. This photo-realistic simulator lets you input commands like Apollo astronauts to navigate, using your device's GPS and accelerometers for real-world data.

**Highlights:** Photo-realistic DSKY interface simulation, Uses iPad GPS for latitude, longitude, altitude, Utilizes iPad accelerometers for attitude, Subset of original DSKY verbs and nouns, Configurable units (meters, nautical miles, statute miles), Includes help page and usage instructions

**Features:** macOS Compatibility

**In-app purchases:** none


### C

[App page](https://appshunter.io/ios/app/c-map-boating/id967289980)

**Currently charting:** #95 Top Grossing · Navigation (US App Store)

Access up-to-date nautical charts for global exploration and planning. Save points of interest and routes, record tracks, and view marine weather. Upgrade for offline maps, GPS, and advanced features like shaded relief and AIS.

**Highlights:** Free chart viewer, Autorouting, Personal waypoints, Track recording, Marine weather forecasts, Offline map downloads, High-resolution bathymetry

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Embark Advanced Weather | $1.99 | per month |
| Embark Offline Maps USA | $2.49 | per month |
| Annual Subscription | $14.99 | per year |
| Annual subscription | $14.99 | per year |
| Region | $18.99 | per year |
| North America | $23.49 | per year |
| Maps Lakes South East USA | $25.99 | per year |
| Annual Subscription | $29.99 | per year |
| Caribbean | $32.99 | per year |
| Maps USA East Coast & Bahamas | $39.99 | per year |

**What reviewers like**

- 🚀 Accurate maps and charts
- 👍 Easy to use and intuitive
- 📍 Helpful for planning trips and routes
- 🛳️ Useful for both professionals and beginners
- ⚙️ Detailed features like shaded relief and weather info

**What reviewers complain about**

- 🐛 Frequent crashes and freezes
- ⚠️ Unreliable GPS tracking and location updates
- 🔌 Offline maps and features not working as expected
- 🤔 Confusing or missing functionality (e.g. route editing)
- 💸 Expensive subscription, not worth the cost

**Reported bugs**

- App crashes when trying to save tracks or routes
- Offline maps fail to download or disappear
- Depth/contour data inaccurate or not displaying properly
- Login and authentication issues preventing access

**Requested features**

- Add mast height/clearance feature
- Improve AIS integration and functionality
- Allow more customization of map views and data
- Provide better customer support and communication


## Frequently asked questions

### Is Dsky free?

Dsky is free to download, with no in-app purchases.

### Is C free?

C is free to download, with in-app purchases available.

### Which has better reviews, Dsky or C?

Dsky is rated higher. Dsky averages 4.6 out of 5 from 11 ratings, while C averages 4.5 from 2.3K ratings.

### Do Dsky or C have ads?

Neither Dsky nor C shows ads.

### Which is updated more often, Dsky or C?

Dsky ships an update every 32 months, and C every 6 weeks. Most recently, Dsky was updated on September 14, 2026 and C on October 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*