# OnSIP vs ESI eMobile

The clearest difference is rating: ESI eMobile at 3.0 against OnSIP's 2.4. ESI eMobile also leads on review sentiment (33% vs 9%) and iOS requirement (11.0 vs 17.4). OnSIP's advantage is update cadence (every 2 months vs every 7 months) and ratings volume (67 vs 12). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ESI eMobile holds the better App Store score, 3.0 against 2.4. That said, the two scores are not equally well evidenced: OnSIP has 67 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 9% of OnSIP's written reviews are positive against 33% of ESI eMobile's.

OnSIP ships an update every 2 months, ESI eMobile every 7 months. The most recent releases landed on September 15, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | OnSIP | ESI eMobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (67 ratings)](https://appshunter.io/ios/app/onsip/id1253050184/reviews) | **[3.0 (12 ratings)](https://appshunter.io/ios/app/esi-emobile/id1435172821/reviews)** |
| Number of ratings | **67** | 12 |
| Positive reviews | 8.7% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Free | Free |
| Size | 26 MB | 70 MB |
| Requires iOS | 17.4 | **11.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OnSIP](https://appshunter.io/developer/1253050183) | [Estech Systems, Inc](https://appshunter.io/developer/624704430) |

## What reviewers say

### OnSIP

[App page](https://appshunter.io/ios/app/onsip/id1253050184)

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.

**Highlights:** HD voice and video calls, Voicemail management, Contact availability monitoring, Call history, Remote work connectivity

**Features:** Vision Pro support

**In-app purchases:** none


### ESI eMobile

[App page](https://appshunter.io/ios/app/esi-emobile/id1435172821)

This business phone system app extends your office phone capabilities to your mobile device. Access voicemails, contacts, call recording, and manage extension preferences on the go. Communicate with colleagues and the outside world as if you were at your desk.

**Highlights:** Voicemail access, Coworker directory, Personal contacts, Call recording, Extension preference management, Conference calls, Coworker availability

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OnSIP free?

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

### Is ESI eMobile free?

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

### Which has better reviews, OnSIP or ESI eMobile?

ESI eMobile is rated higher. OnSIP averages 2.4 out of 5 from 67 ratings, while ESI eMobile averages 3.0 from 12 ratings.

### Do OnSIP or ESI eMobile have ads?

Neither OnSIP nor ESI eMobile shows ads.

### Which is updated more often, OnSIP or ESI eMobile?

OnSIP ships an update every 2 months, and ESI eMobile every 7 months. Most recently, OnSIP was updated on September 15, 2026 and ESI eMobile on June 1, 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.*