Comparison

CoreNexa vs ESI eMobile

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CoreNexa

Manage your business phone system from your mobile device. Make and receive calls using your business number and caller ID, access voicemail, and utilize features like virtual attendants and conference bridges. Stay connected to your business communications on the go.

Highlights
  • Make/receive business calls
  • Use business caller ID
  • Access voicemail
  • Extension dialing
  • Shared contacts directory
  • Conference bridge access
  • Virtual attendant management
Features
Read full description

Leverage the power of your business phone through your iPhone or iPad - anywhere, anytime. By using your iPhone or iPad, you can make and receive calls from your business phone, access your voicemail, business directories, recent calls, conference bridges and other valuable features, such as virtual attendant. Some key benefits of the mobile app include the following: · Making calls using your business calling plan and your business caller ID · Receiving calls made to your business phone number on the app · Being able to extension dial co-workers · Using the shared contacts directory and having access to all extensions in the company · Viewing recent calls · Clicking to dial back any of your recent callers · One-click to dial your conference bridges as a moderator or attendee · Listening to your voicemail · Updating your voicemail greetings · Managing virtual attendant schedules, including the ability to override your current schedule · Updating your virtual attendant greetings To Use this App: · Download and install the app on your iPhone or iPad · Sign-in using your phone system portal username and password NOTE: If you need more information or can’t log in, check with your service provider to see if you have the necessary permissions to use this application.

About

ESI eMobile

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
Read full description

ESI’s eMobile™ application for iOS brings your eSIP Evolution Series™ business phone system extension with you, wherever you may be! Access voicemails​, coworkers directory and personal contacts, and call recording features from anywhere. Manage your extension preferences and even conference calls from the palm of your hand. See your coworkers’ availability and easily communicate with them, as well as the rest of the world, as if you were sitting in front of your ESI desk phone. *Must be used with ESI’s eSIP Evolution Series™ phone system - e-series or x-series. *Contact your Certified ESI Partner for more information.

Screenshots

CoreNexa3 screens
ESI eMobile4 screens

Verdict

The call

The clearest difference is rating: ESI eMobile at 3.0 against CoreNexa's 2.3. ESI eMobile also leads on review sentiment (33% vs 22%). CoreNexa's advantage is update cadence (every 3 weeks vs every 7 months) and ratings volume (256 vs 12). 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

ESI eMobile holds the better App Store score, 3.0 against 2.3. That said, the two scores are not equally well evidenced: CoreNexa has 256 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 22% of CoreNexa's written reviews are positive against 33% of ESI eMobile's.

UpkeepUpdate frequency

CoreNexa ships an update every 3 weeks, ESI eMobile every 7 months. The most recent releases landed on July 25, 2026 and June 1, 2026 respectively.

Scorecard4 real differences · 6 level
CoreNexa versus ESI eMobile: the parameters behind the verdict, then further details
ParameterCoreNexaESI eMobile
PriceFreeFree
Rating2.3 (256 ratings)3.0 (12 ratings) — better
Positive reviews22.5% of reviews33.3% of reviews — better
Number of ratings256 — better12
Update frequencyEvery 3 weeks — betterEvery 7 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.011.0 — better
Further details — not scored
Size49 MB70 MB
Age rating4+4+
DeveloperCoreNexa, LLCEstech Systems, Inc

Customer experience

CoreNexa

All ratings256 ratings
Positive30.1%
Neutral2.3%
Negative67.6%
Written reviews89 reviews
Positive22.5%
Neutral2.2%
Negative75.3%

ESI eMobile

All ratings12 ratings
Positive41.7%
Neutral16.7%
Negative41.7%
Written reviews6 reviews
Positive33.3%
Neutral16.7%
Negative50.0%

Bugs and requests

CoreNexa

Reported bugs

18 issues
  • Calls drop after 5-6 minutes
  • Audio cuts in and out during calls
  • Incoming calls don't ring on device
  • App crashes when selecting text
  • Speakerphone stops working mid-call
Show 13 more
  • Screen orientation issues
  • Call history not populating
  • Voicemail messages disappearing
  • Ghost messages that won't delete
  • Calls disconnect when switching from cellular to WiFi
  • Multiple simultaneous calls cause app failure
  • App logs out without warning
  • Hangup button requires multiple clicks
  • Auto-fill password field prevents login recovery
  • Notifications interrupt and end calls
  • Video recording access lost after updates
  • Contacts only load in phone app, not web version
  • Call quality degrades with each update

Requested features

11 requests
  • Improve call stability and reliability
  • Enhance audio quality and noise reduction
  • Better contact management and syncing
  • SMS/text messaging functionality
  • Improved speaker phone reliability
Show 6 more
  • Better volume controls and audio settings
  • Respect system-wide iOS settings
  • Faster app load times
  • Improved call history tracking
  • Better offline functionality
  • Adjust call button placement away from bottom bar

ESI eMobile

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

CoreNexa

No in-app purchases

None

ESI eMobile

No in-app purchases

Questions

Is CoreNexa free?
CoreNexa 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, CoreNexa or ESI eMobile?
ESI eMobile is rated higher. CoreNexa averages 2.3 out of 5 from 256 ratings, while ESI eMobile averages 3.0 from 12 ratings.
Do CoreNexa or ESI eMobile have ads?
Neither CoreNexa nor ESI eMobile shows ads.
Which is updated more often, CoreNexa or ESI eMobile?
CoreNexa ships an update every 3 weeks, and ESI eMobile every 7 months. Most recently, CoreNexa was updated on July 25, 2026 and ESI eMobile on June 1, 2026.

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