# IMO Signs vs Navigation Lights 3D

The clearest difference is review sentiment: IMO Signs at 100% against Navigation Lights 3D's 20%. Navigation Lights 3D's advantage is update cadence (every 3 weeks vs every 95 months) and price ($1.99 vs $3.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

IMO Signs costs $3.99 and Navigation Lights 3D $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

IMO Signs ships an update every 95 months, Navigation Lights 3D every 3 weeks. The most recent releases landed on September 21, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | IMO Signs | Navigation Lights 3D |
| --- | --- | --- |
| Price | $3.99 | **$1.99** |
| Positive reviews | **100.0% of reviews** | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 95 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Size | 194 MB | 2 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sergejs Zeigurs](https://appshunter.io/developer/1439812373) | [Smirnov Yury](https://appshunter.io/developer/420438416) |

## What reviewers say

### IMO Signs

[App page](https://appshunter.io/ios/app/imo-signs/id1439813671)

This educational app allows users to search for symbols by ID or name. It's designed for studying and reinforcing knowledge in a specific subject area. Enjoy a straightforward learning experience.

**Highlights:** Search by ID, Search by Name, Knowledge rechecking, Study aid

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

**In-app purchases:** none


### Navigation Lights 3D

[App page](https://appshunter.io/ios/app/navigation-lights-3d/id1548128224)

Study maritime navigation lights and vessel identification according to COLREGs-72. Observe vessels from various angles to understand their position, capabilities, and activities in low visibility. Ideal for aspiring and current navigators.

**Highlights:** COLREGs-72 compliant study, Observe night lights from multiple angles, Understand vessel position and capabilities, Identify vessel types in low visibility, Supports dark mode

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is IMO Signs free?

IMO Signs costs $3.99, with no in-app purchases.

### Is Navigation Lights 3D free?

Navigation Lights 3D costs $1.99, with no in-app purchases.

### Do IMO Signs or Navigation Lights 3D have ads?

Neither IMO Signs nor Navigation Lights 3D shows ads.

### Which is updated more often, IMO Signs or Navigation Lights 3D?

IMO Signs ships an update every 95 months, and Navigation Lights 3D every 3 weeks. Most recently, IMO Signs was updated on September 21, 2026 and Navigation Lights 3D on September 20, 2026.

---

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