OneMessage vs ARCO Zeus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OneMessage
Send secure, reliable text messages over satellite or cellular connections, saving bandwidth and money. This app ensures private, person-to-person communication, even at sea, with a familiar interface for easy conversation tracking.
- Secure and reliable text messaging
- Works over satellite (Iridium, Globalstar, Inmarsat) and Wi-Fi/cellular
- Saves bandwidth, time, and money
- Person-to-person private messaging
- Message queuing for cost-effective sending
- Threaded conversations
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Text Messaging – On Land or At Sea with OCENS OneMessage With OCENS OneMessage text messaging, you can easily maintain secure, reliable contact with your friends, family, or fleet while saving time, bandwidth, and money. OneMessage enables two-way, private and personal text messaging over your Wi-Fi connection through the Iridium GO! or other Iridium, Globalstar, Inmarsat satellite phones, or through a conventional cellular or Wi-Fi connection. OneMessage is person-to-person, not person-to-machine like other satellite messaging services. OneMessage ensures that texts reach only their intended recipient no matter how many devices are connected to the Wi-Fi, whether on land or at sea. Once you hit send, you can rest assured that your contacts will receive your text. Inbound messages are available for download when you connect to your sat phone, no matter where you are. Streamlined, Simple Onboard Communication Queue your messages using the OneMessage app, and then switch on your sat phone and send in seconds to save costs and minimize bandwidth usage. While you’re connected, OneMessage automatically receives any messages waiting for you on the network. Your messages appear threaded within OneMessage, just like you’d expect so that you can easily keep track of each conversation. Eliminate International Texting Fees for Good Iridium is treated as a foreign country by all cellular carriers. These carriers can charge US$15 per month or US$0.50 per message, and sometimes even apply overage rates when sending SMS messages to an Iridium phone. OneMessage users do NOT need to activate international texting service on their smartphone to send texts. With OneMessage, you get the maximum value from your satellite phone connection economically, while using an interface that feels intuitive and familiar to keep in touch no matter where you travel. Please review our Privacy Policy at http://www.ocens.com/Privacy-Policy.aspx and Terms of Use at http://downloads.ocens.com/terms-of-use.htm.
ARCO Zeus
Configure, control, and monitor your ARCO Smart Regulator. Customize charging profiles and safety limits for optimal system performance. Offers default profiles for quick setup or expert tuning.
- Configure ARCO Smart Regulator
- Monitor system performance
- Customize charging profiles
- Set safety limits
- Choose default battery profiles
- Expert tuning assistance
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Setup, control, and monitor your ARCO Smart Regulator all from one location. Charging profiles and safety limits are fully customizable from the app. You can choose a default profile for your batteries to get started quickly, or work with an installation expert to tune your Smart regulator and squeeze out maximum performance from your system.
Screenshots
Verdict
The clearest difference is rating: OneMessage at 5.0 against ARCO Zeus's 4.3. OneMessage also leads on iOS requirement (13.0 vs 15.6). ARCO Zeus's advantage is update cadence (every 6 weeks vs every 4 months) and ratings volume (6 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OneMessage holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 2 and 6 respectively.
OneMessage ships an update every 4 months, ARCO Zeus every 6 weeks. The most recent releases landed on June 1, 2026 and August 5, 2026 respectively.
| Parameter | OneMessage | ARCO Zeus |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.3 (6 ratings) |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | 2 | 6 — better |
| Update frequency | Every 4 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 26 MB | 97 MB |
| Age rating | 4+ | 4+ |
| Developer | OCENS, Inc. | Dominic Policicchio |
Customer experience
OneMessage
ARCO Zeus
In-app purchases
OneMessage
No in-app purchases
ARCO Zeus
No in-app purchases









