# Sight Calc vs Navily

The clearest difference is price: Navily at Free against Sight Calc's $1.99. Navily also leads on update cadence (every 2 weeks vs every 11 months) and ratings volume (813 vs 7). Sight Calc's advantage is in-app purchases (none vs 4) and rating (5.0 vs 4.8). On ads, device support and iOS requirement there is nothing between them.

Navily is free to download; Sight Calc costs $1.99 up front. Navily sells 4 in-app purchases, starting at $9.49 per year. Sight Calc asks for nothing beyond the download.

Sight Calc holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Navily has 813 ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 82% of Sight Calc's written reviews are positive against 93% of Navily's, so the app with the better star average is not the one people write more warmly about.

Sight Calc ships an update every 11 months, Navily every 2 weeks. The most recent releases landed on September 10, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Sight Calc | Navily |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/sight-calc/id497809138/reviews)** | [4.8 (813 ratings)](https://appshunter.io/ios/app/navily/id881103205/reviews) |
| Number of ratings | 7 | **813** |
| Positive reviews | 82.4% of reviews | **93.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 235 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NUVOCOM INCORPORATED](https://appshunter.io/developer/497809141) | [The Navigation Family](https://appshunter.io/developer/1716340641) |

## What reviewers say

### Sight Calc

[App page](https://appshunter.io/ios/app/sight-calc/id497809138)

This app is a specialized calculator for sight reductions using the Law of Cosines method. It's designed for students learning celestial navigation and requires manual input of LHA, declination, and approximate latitude.

**Highlights:** Law of Cosines sight reduction, Manual LHA, declination, and latitude input, Input as degrees/minutes or decimal degrees, Continuous computation of Hc, Z, and Zn, Supports North/South latitude and declination conventions, Clear and clear entry functions, Convert minutes to decimal degrees

**Features:** macOS Compatibility

**In-app purchases:** none


### Navily

[App page](https://appshunter.io/ios/app/navily/id881103205)

This app serves as a comprehensive mobile cruising guide for boaters. It offers a vast database of marinas and anchorages, user-generated reviews and photos, and seamless berth booking across Europe. Connect with other users and marinas through in-app chat and receive real-time warnings.

**Highlights:** 35,000+ marinas and anchorages, 350,000+ community photos and comments, Easy berth booking in 700+ European marinas, In-app chat with users and marinas, Real-time anchorage warnings, Emergency SOS feature

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Navily Premium | $9.49 | per year |
| Navily Premium | $18.49 | per year |
| Navily Premium | $24.99 | per year |
| Navily Premium 30 days | $17.99 | one-time |

**What reviewers like**

- 🚀 Excellent resource for cruisers
- 👍 Helpful community reviews
- 🌟 Essential app for sailing
- 💯 Indispensable for planning
- 🗺️ Detailed anchorage information

**What reviewers complain about**

- 🗺️ Limited coverage in some regions
- 💰 Expensive premium subscription
- 🔍 Difficult to add new locations
- 🔢 Inaccurate or outdated information
- 🤖 Unreliable weather forecasts

**Reported bugs**

- Booking cancellations not working
- Spinning icon issue with past bookings
- Difficulty accessing messages from map view

**Requested features**

- Offline map downloads
- Improved route planning tools
- Live chat with other users
- Customizable notifications
- Better integration with navigation apps


## Frequently asked questions

### Is Sight Calc free?

Sight Calc costs $1.99, with no in-app purchases.

### Is Navily free?

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

### Which has better reviews, Sight Calc or Navily?

Sight Calc is rated higher. Sight Calc averages 5.0 out of 5 from 7 ratings, while Navily averages 4.8 from 813 ratings.

### Do Sight Calc or Navily have ads?

Neither Sight Calc nor Navily shows ads.

### Which is updated more often, Sight Calc or Navily?

Sight Calc ships an update every 11 months, and Navily every 2 weeks. Most recently, Sight Calc was updated on September 10, 2026 and Navily on September 27, 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.*