# IMO Signs vs Non

The clearest difference is update cadence: Non at every 39 months against IMO Signs's every 95 months. Non also leads on iOS requirement (15.6 vs 17.6). IMO Signs's advantage is price ($3.99 vs $4.99). On ads, in-app purchases and device support there is nothing between them.

IMO Signs costs $3.99 and Non $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

IMO Signs ships an update every 95 months, Non every 39 months. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | IMO Signs | Non |
| --- | --- | --- |
| Price | **$3.99** | $4.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 95 months | **Every 39 months** |
| Monetization | Paid | — |
| Size | 194 MB | 44 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sergejs Zeigurs](https://appshunter.io/developer/1439812373) | [Maxim Lukyanenko](https://appshunter.io/developer/1496252741) |

## 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


### Non

[App page](https://appshunter.io/ios/app/non-vessel-specific-operation/id6451435397)

**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 Non free?

Non costs $4.99, with no in-app purchases.

### Do IMO Signs or Non have ads?

Neither IMO Signs nor Non shows ads.

### Which is updated more often, IMO Signs or Non?

IMO Signs ships an update every 95 months, and Non every 39 months. Most recently, IMO Signs was updated on October 8, 2026 and Non on October 25, 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.*