# OffshoreSMS vs CallSign

The clearest difference is rating: CallSign at 5.0 against OffshoreSMS's 1.0. CallSign also leads on in-app purchases (none vs 4) and review sentiment (100% vs 83%). OffshoreSMS's advantage is update cadence (every 10 days vs monthly). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. OffshoreSMS sells 4 one-off in-app purchases. CallSign asks for nothing beyond the download.

CallSign holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 83% of OffshoreSMS's written reviews are positive against 100% of CallSign's.

OffshoreSMS ships an update every 10 days, CallSign monthly. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | OffshoreSMS | CallSign |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/offshoresms/id1526656158/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/callsign/id6758431626/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Monthly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 65 MB | 54 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Offshore SMS Pty Ltd](https://appshunter.io/developer/1495643255) | [Primaxis Pty Ltd](https://appshunter.io/developer/1639987030) |

## What reviewers say

### OffshoreSMS

[App page](https://appshunter.io/ios/app/offshoresms/id1526656158)

This app provides commercial vessel owners, skippers, and crew with essential tools for maritime safety management. It simplifies the creation and real-time updating of safety management systems, ensuring all crew members have access to critical information. The platform aims to reduce paper usage and streamline safety processes on board.

**Highlights:** Real-time SMS updates for crew, Digital vessel logs and forms, Crew qualification and induction management, Passenger manifest creation, Expense logging and receipt saving, Personal Mariner Profile creation, Fleet management tools

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Digital Logs Plan | $31.99 | one-time |
| Digital SMS Plan | $84.99 | one-time |
| OffshoreSMS LOGS + SMS | $94.99 | one-time |
| OffshoreSMS PRO Plan | $159.99 | one-time |


### CallSign

[App page](https://appshunter.io/ios/app/callsign/id6758431626)

Connect with qualified New Zealand Sign Language (NZSL) interpreters on-demand. This service facilitates communication in various settings, from clinics to remote work, ensuring accessibility during business hours. Registration is a simple, one-time process to enable quick connections whenever needed.

**Highlights:** On-demand NZSL interpreting, Connect from any device, Secure and private communication, Simple registration process, Available during business hours

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

**In-app purchases:** none


## Frequently asked questions

### Is OffshoreSMS free?

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

### Is CallSign free?

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

### Which has better reviews, OffshoreSMS or CallSign?

CallSign is rated higher. OffshoreSMS averages 1.0 out of 5 from 1 ratings, while CallSign averages 5.0 from 1 ratings.

### Do OffshoreSMS or CallSign have ads?

Neither OffshoreSMS nor CallSign shows ads.

### Which is updated more often, OffshoreSMS or CallSign?

OffshoreSMS ships an update every 10 days, and CallSign monthly. Most recently, OffshoreSMS was updated on October 19, 2026 and CallSign on October 10, 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.*