Comparison

PBX Viva vs UST

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

Head to head
About

PBX Viva

Features
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With Virtual PBX, your company will be able to effectively organize telephony: set up receiving calls to a single multi-channel number, voice greeting and call distribution, analyze call statistics and record conversations. Thanks to the mobile application, the main functions of the Virtual PBX are available on your smartphone, and you can use them at any time, even outside the office. Mobile app functionality: access to call history and records (searchable by customer number or employee name); listening to recordings of conversations; convenient summary of calls (accepted, made and missed at the moment); viewing statistics for any period; setting up rules for receiving calls and forwarding calls; creating and editing departments; adding new VATS users. Install the PBX Viva-MTS mobile application, enter the login and password for your personal VATS account and control the company's calls in real time.

About

UST

Features
Read full description

Welcome to UST - Our app connects you with trusted local professionals for seamless car repair and maintenance. . Get transparent pricing, read verified customer reviews, and schedule your service with ease. . Plus, effortlessly find and purchase the auto parts you need. . Experience hassle-free auto care and convenience with UST.

Screenshots

PBX Viva4 screens
UST4 screens

Verdict

The call

The clearest difference is update cadence: UST at every 2 months against PBX Viva's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

PBX Viva ships an update every 3 months, UST every 2 months. The most recent releases landed on October 15, 2026 and October 7, 2026 respectively.

Scorecard1 real difference ยท 5 level
PBX Viva versus UST: the parameters behind the verdict, then further details
ParameterPBX VivaUST
PriceFreeFree
Update frequencyEvery 3 monthsEvery 2 months โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.514.0 โ€” better
Further details โ€” not scored
Size59 MB16 MB
Age rating4+17+
DeveloperViva Armenia CJSCUST LLC

In-app purchases

None

PBX Viva

No in-app purchases

None

UST

No in-app purchases

Questions

Is PBX Viva free?
PBX Viva is free to download, with no in-app purchases.
Is UST free?
UST is free to download, with no in-app purchases.
Do PBX Viva or UST have ads?
Neither PBX Viva nor UST shows ads.
Which is updated more often, PBX Viva or UST?
PBX Viva ships an update every 3 months, and UST every 2 months. Most recently, PBX Viva was updated on October 15, 2026 and UST on October 7, 2026.

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