OnSIP vs Callcentric SMS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OnSIP
This app extends your business phone system to your mobile device, enabling HD voice and video calls, contact monitoring, and voicemail management. Stay connected with clients and colleagues from anywhere, without needing extra hardware.
- HD voice and video calls
- Voicemail management
- Contact availability monitoring
- Call history
- Remote work connectivity
Read full descriptionHide full description
OnSIP brings your business phone to you, whether you're at the office, at a client's site, or working remotely. Connect with customers, partners, vendors, and coworkers from your OnSIP account on your iPhone. With OnSIP, you can take advantage of standard business phone features without the additional hardware. Make and receive HD voice and video calls, monitor contact availability, check recent call history, and manage your voicemail in one simple interface.
Callcentric SMS
Send and receive SMS messages using your Callcentric phone numbers. This app offers real-time messaging, contact list integration, and dark mode support. It requires an active Callcentric account and an SMS Access Plan.
- Real-time SMS messaging
- Dark Mode support
- Contact list integration
- Multiple number support
- Manage SMS functionality per number
- Multi-account support
- Customizable default SMS number
Read full descriptionHide full description
The completely new Callcentric SMS app has been re-designed to provide the best SMS experience with your Callcentric account. SMS is supported on ALL of our US and Canada Numbers! Getting started is easy, all you need to do is activate one of our SMS Access Plans on your Callcentric account and install this app on your iOS device. That's it! REQUIRED TO USE THIS APP • An active Callcentric VoIP service account • Callcentric SMS Access Plan & US/Canada phone number NOT CURRENTLY SUPPORTED • MMS Messaging (group messages, attachments, etc) • SMS Messaging with International numbers (outside of US/Canada) FEATURES & HIGHLIGHTS • SMS Messaging in real-time • Dark Mode support for easier viewing • Option to use the Contact List in your device • Support for messaging with multiple numbers via a single interface • Enable/Disable SMS functionality on any of your US, Canada, or toll-free numbers • Store the username and settings for multiple accounts for fast switching between logins • Show your SMS number (the number you are sending from) in the conversation list - useful when you use multiple SMS numbers. Enable in settings • Set a default SMS number to use for sending messages or manually choose the SMS number you want to use on a per message basis. Enable in settings Access to Contacts (optional): Used to let you select a contact to send an SMS to, and properly show name information on messages received with an entry in your iPhone/iPad contacts. Your Contact list will NEVER to be uploaded to Callcentric. Data is used locally within the app. We do not have access to your Contacts outside of the app. Notifications (optional): We use push notifications to notify you of incoming SMS messages in real-time when the app is in the background. WARNING: if you do not enable notifications you will not receive notice of new incoming SMS messages until the next time you open the app.
Screenshots
Verdict
The clearest difference is review sentiment: Callcentric SMS at 73% against OnSIP's 8%. Callcentric SMS also leads on rating (4.7 vs 2.4) and update cadence (every 3 weeks vs every 2 months). 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.
Callcentric SMS holds the better App Store score, 4.7 against 2.4. Both are backed by a comparable volume of ratings — 67 and 202 respectively. Written reviews point the same way: 8% of OnSIP's written reviews are positive against 73% of Callcentric SMS's.
OnSIP ships an update every 2 months, Callcentric SMS every 3 weeks. The most recent releases landed on October 5, 2026 and October 14, 2026 respectively.
| Parameter | OnSIP | Callcentric SMS |
|---|---|---|
| Price | Free | Free |
| Rating | 2.4 (67 ratings) | 4.7 (202 ratings) — better |
| Positive reviews | 7.7% of reviews | 72.7% of reviews — better |
| Number of ratings | 67 | 202 — better |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.4 | 16.6 — better |
| Further details — not scored | ||
| Size | 26 MB | 49 MB |
| Age rating | 4+ | 17+ |
| Developer | OnSIP | Callcentric, Inc. |
Customer experience
OnSIP
Callcentric SMS
In-app purchases
OnSIP
No in-app purchases
Callcentric SMS
No in-app purchases








