Comparison

CallingU Softphone vs UUSolar

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

Head to head

About

CallingU Softphone

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CallingU Softphone's accompanying softphone app to the CallingU Softphone platform. A SIP softphone app that supports push notifications, HD voice and video, and more. In addition to this, CallingU Softphone's app provides • Free calling between app users

About

UUSolar

Features

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UUSolarisaone-stopmonitoringsystemdesignedforsmartdevices,allowingyoutoenjoy seamlessandreal-timedevicestatusupdatesnomatterwhereyouare Lightweightdata:Monitoringdataislightweighttoensureefficientandefficientdata transmission. Proactivereporting:Thedevicewillproactivelysendimportantdatatotheapplicationwithout frequentqueries. Dataclassification:Adoptdifferentmonitoringstrategiesfordifferenttypesofdatatomake monitoringmoreaccurateandeffective. Triggermonitoring:Datareportingwillonlybetriggeredwhenchangesoccur,reducing unnecessarydatatraffic. Timelypush:Whenthedevicestatuschangesoranalarmoccurs,pushittotheuserassoonas possibletoensurethatyoucanrespondinatimelymanner. Secondlevelmonitoring:Dataisupdatedatasecondlevelrefreshrate,ensuringreal-time performanceeveninremotemonitoringscenarios.

Screenshots

CallingU Softphone4 screens

UUSolar3 screens

Verdict

The call

The clearest difference is update cadence: UUSolar at monthly against CallingU Softphone's every 7 months. UUSolar also leads on iOS requirement (12.0 vs 16.0). On price, ads, in-app purchases and device support 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.

UpkeepUpdate frequency

CallingU Softphone ships an update every 7 months, UUSolar monthly. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

Scorecard2 real differences · 4 level

CallingU Softphone versus UUSolar: the parameters behind the verdict, then further details
Parameter	CallingU Softphone	UUSolar
Price	Free	Free
Update frequency	Every 7 months	Monthly — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone	iPhone, iPod — better
Requires iOS	16.0	12.0 — better
Further details — not scored
Size	109 MB	47 MB
Age rating	17+	17+
Developer	FIBRE TELECOM NETWORKS LTD	泽炜李

In-app purchases

None

CallingU Softphone

No in-app purchases

None

UUSolar

No in-app purchases

Questions

Is CallingU Softphone free?

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

Is UUSolar free?

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

Do CallingU Softphone or UUSolar have ads?

Neither CallingU Softphone nor UUSolar shows ads.

Which is updated more often, CallingU Softphone or UUSolar?

CallingU Softphone ships an update every 7 months, and UUSolar monthly. Most recently, CallingU Softphone was updated on November 7, 2026 and UUSolar on November 8, 2026.