Comparison

Vialer vs Call One UC

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

Head to head
About

Vialer

Make and receive business calls using your company's number from your smartphone. Track call history, view colleague availability, and manage your call statistics and accessibility settings. Requires a VoIP account and user credentials from a hosted telephony provider.

Highlights
  • Business number calling
  • Recent calls list
  • Colleague availability insight
  • Call statistics management
  • VoIP calling via 4G/WiFi
  • Customizable accessibility
Features
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Easily dial out with your business number using the Vialer app on your smartphone. In the app you can find made and received calls in the recent calls list. You have direct insight into the reachability of your colleagues and incoming calls automatically reach the right person in the organization. You can always view and adjust your statistics, call plan and accessibility. With the Vialer app you call via 4G or WiFi. The only thing you need is a VoIP account linked to your user account. After this, you can immediately start using VoIP calling. The called customer will see your business number on their screen. Note: to use this app, you need a user account from your hosted telephony provider. Want to know more about the app? Go to https://vialerapp.com

About

Call One UC

Manage your home or office telephony services remotely. Make and receive calls using your landline number over WiFi or cellular data, and seamlessly transfer calls between devices. Includes features for conference calls, voicemail, and fax management.

Highlights
  • Join audio/video conferences
  • Make/receive calls with landline number
  • Transfer calls between devices
  • Add video to calls
  • Use landline caller ID
  • Voicemail and fax playback
  • Transcribed voice messages
Features
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Max UC - For customers of Call One using the Call One UC product. IMPORTANT: FULL TELEPHONY FUNCTIONALITY IS ONLY AVAILABLE WITH AN ACTIVE CALL ONE UC ACCOUNT ***** With Call One UC, you can take control of your home or office telephony services from anywhere. FEATURES • Call One Meeting: Join audio and video conferences that you are invited to • Make and receive calls over WiFi/LTE/3G using your landline number • Move calls between your landline, mobile and tablet devices, without hanging up • Add video to your calls • Make calls from any phone using your landline caller ID • Receive new voicemail alerts • Playback voice and video messages and view faxes • View transcribed voice messages • Control how incoming calls are handled • Sync your Accession contacts across devices NOTE: Your current feature bundle may not offer all features listed and may require you to pay additional subscription charges to access certain features. Contact your sales agent for information. Call One UC also requires 3G/4G or WiFi access. Use of these services may incur additional charges.

Screenshots

Vialer4 screens
Call One UC3 screens

Verdict

The call

The clearest difference is rating: Vialer at 5.0 against Call One UC's 4.2. Vialer also leads on update cadence (every 3 weeks vs every 4 months). Call One UC's advantage is ratings volume (29 vs 2) and iOS requirement (12.0 vs 14.0). 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

Vialer holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Call One UC has 29 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Vialer ships an update every 3 weeks, Call One UC every 4 months. The most recent releases landed on October 6, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Vialer versus Call One UC: the parameters behind the verdict, then further details
ParameterVialerCall One UC
PriceFreeFree
Rating5.0 (2 ratings) — better4.2 (29 ratings)
Positive reviews—50.0% of reviews
Number of ratings229 — better
Update frequencyEvery 3 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS14.012.0 — better
Further details — not scored
Size93 MB148 MB
Age rating4+4+
DeveloperVoIPGRIDCall One, Inc.

Customer experience

Vialer

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Call One UC

All ratings29 ratings
Positive79.3%
Neutral10.3%
Negative10.3%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Vialer

No in-app purchases

None

Call One UC

No in-app purchases

Questions

Is Vialer free?
Vialer is free to download, with no in-app purchases.
Is Call One UC free?
Call One UC is free to download, with no in-app purchases.
Which has better reviews, Vialer or Call One UC?
Vialer is rated higher. Vialer averages 5.0 out of 5 from 2 ratings, while Call One UC averages 4.2 from 29 ratings.
Do Vialer or Call One UC have ads?
Neither Vialer nor Call One UC shows ads.
Which is updated more often, Vialer or Call One UC?
Vialer ships an update every 3 weeks, and Call One UC every 4 months. Most recently, Vialer was updated on October 6, 2026 and Call One UC on October 24, 2026.

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