Comparison

UltraTone Connect vs DataCentral

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

Head to head
About

UltraTone Connect

Make free VoIP or low-cost international calls using WiFi or cellular data. Offers a callback feature for unstable connections and provides clearer audio at a fraction of traditional SIM card costs.

Highlights
  • Free VoIP calls
  • Low-cost international calls
  • WiFi and 4G/5G connectivity
  • Callback Request feature
  • Superior audio quality
  • Cost-efficient alternative
Features
Read full description

UltraTone enables you to make free VOIP or low cost international calls over the internet, utilizing either WiFi or 4G connectivity and leveraging the high-speed potential of 4G/5G technology. The 'Callback Request' feature ensures that you can place crucial calls even when your internet connection is unstable, offering a cost-efficient alternative to traditional calling methods. On average, UltraTone is 80% less expensive compared to calls made using a SIM card. Additionally, it delivers superior and faster connections, providing much clearer audio quality during calls.

About

DataCentral

Monitor your servers, sensors, and infrastructure in real-time from your iPhone. Receive instant alerts for temperature, uptime, and power status changes. Ideal for home labs, small businesses, and colocation racks to prevent downtime.

Highlights
  • Real-time sensor readings
  • Customizable push notifications
  • Uptime and power status monitoring
  • Historical data and trend analysis
  • Modern interface for quick glances
Features
Read full description

DataCentral is the app for watching the US AI data center race — from Stargate-scale campuses and xAI's Colossus to the grid strain the buildout is creating. We don't pretend other companies' sites are live. Follow the buildout (free) - Buildout Pulse — sourced stories of announcements, milestones, and grid news, each with a source and an as-of date. - The Race — leaderboards ranking builders, states, and campuses by announced gigawatts. First open sets an overnight baseline rather than inventing climbers. Share a leaderboard card in a tap. - Grid — a three-state teaser ranked by the registry model, labeled "not live EIA," with MW announced and AI announced. Pro unlocks live EIA ranking. - Catalog — nationwide facilities with announced MW. Online and Building are registry status, not live health. - Your State — pick a state for its EIA residential electricity rate (labelled with the month published) shown beside announced facility MW and public proceedings. The app does not attribute rate changes to data centers. - Home Screen widgets — tracked announced capacity and the latest headline, updated in the background from a local snapshot. - One custom site to track your own facility manually. DataCentral Pro - Live facility telemetry — connect your own sites via HTTPS you supply and stream live power, utilization, and status on a real poll cadence. - Live EIA ranking — full state grid ranking from EIA-930, not the free registry teaser. - Assistant — ask about your watches, Race ranks, Grid, and Time to Power. Answers are grounded in data already in the app. - Unlimited custom data centers, with status/grid alerts and a "My Site" widget. - Energy cost modeling with customizable $/kWh. - Predictive insights and infrastructure alerts. - Annual plan includes a 7-day free trial. Honest data labeling - Cover copy states we don't pretend other companies' sites are live. - Pulse cards carry a source and an as-of date (for example "Updated Aug 27, 2026"). - Race ranks announced GW. Overnight Moves starts as a baseline on first open. - Free Grid is the registry model, labeled not live EIA. Rows read MW announced / AI announced. - Catalog MW is Announced. Online / Building are registry status, not live health. - Connected sites you instrument are badged LIVE with a last-updated timestamp. - Live telemetry requires a metrics endpoint you control (or a gateway you deploy). Who it's for - Investors and analysts tracking the US AI infrastructure buildout. - Enthusiasts following Stargate, Colossus, and the gigawatt race. - Infrastructure engineers and operators monitoring their own facilities. Subscription required for live connections, live EIA ranking, Assistant, and other Pro features. The Race, Pulse, registry Grid teaser, nationwide catalog, and manual custom sites remain available without a subscription.

Screenshots

UltraTone Connect4 screens
DataCentral4 screens

Verdict

The call

The clearest difference is update cadence: DataCentral at every 3 days against UltraTone Connect's every 3 weeks. UltraTone Connect's advantage is iOS requirement (12.0 vs 17.6). On price, rating, review sentiment and ratings volume 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. UltraTone Connect sells 1 one-off in-app purchase and DataCentral sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for UltraTone Connect against 5.0 for DataCentral. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

UltraTone Connect ships an update every 3 weeks, DataCentral every 3 days. The most recent releases landed on September 17, 2026 and October 7, 2026 respectively.

Scorecard2 real differences · 8 level
UltraTone Connect versus DataCentral: the parameters behind the verdict, then further details
ParameterUltraTone ConnectDataCentral
PriceFreeFree
Rating5.0 (5 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings5 — better2
Update frequencyEvery 3 weeksEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better17.6
Further details — not scored
Size44 MB34 MB
Age rating4+4+
DeveloperBasketAsia Sdn. Bhd.Stephen Moore

Customer experience

UltraTone Connect

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

DataCentral

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

UltraTone Connect

One-time1
  • 12.99 USD Calling Credit$12.99
2 purchases

DataCentral

Subscriptions2
  • DataCentral Pro Monthly$9.991 Month
  • DataCentral Pro Annual$89.991 Year

Questions

Is UltraTone Connect free?
UltraTone Connect is free to download, with in-app purchases available.
Is DataCentral free?
DataCentral is free to download, with in-app purchases available.
Which has better reviews, UltraTone Connect or DataCentral?
UltraTone Connect and DataCentral are both rated 5.0 out of 5 on the App Store, from 5 and 2 ratings respectively.
Do UltraTone Connect or DataCentral have ads?
Neither UltraTone Connect nor DataCentral shows ads.
Which is updated more often, UltraTone Connect or DataCentral?
UltraTone Connect ships an update every 3 weeks, and DataCentral every 3 days. Most recently, UltraTone Connect was updated on September 17, 2026 and DataCentral on October 7, 2026.

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