Comparison

Flex Call Manager vs Smart

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

Head to head

★ 5.01 ratingsView app →

About

Flex Call Manager

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++ Achtung: Die Flex Call Manager App funktioniert nur in Verbindung mit einem aktiven Account ++ Flex Call Manager ist ein modernes Kommunikationssystem von Gamma. Holen Sie sich Ihre Telefonanlage auf Ihr Smartphone. Über diese App verwenden Sie Ihr Smartphone als mobile Nebenstelle Ihrer virtuellen Telefonanlage. Empfangen und starten Sie weltweit Anrufe unter Ihrer Festnetznummer und telefonieren Sie kostengünstig auch unterwegs. Nutzen Sie die Funktionen Ihrer Telefonanlage sowie alle Features der Gamma FlexPBX.

About

Smart

This SIP client connects to various telephone systems, offering call management features like hold, mute, and loudspeaker. It includes a phone book, call history, and customizable codecs for efficient communication on the go.

Highlights

Simple setup
IPv4 and IPv6 support
Call hold, mute, and loudspeaker
Phone book and call history
Customizable codecs
Bluetooth support
Light & dark mode

Features

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Smart-SIP-Phone: The SIP client for every SIP telephone system Smart-SIP-Phone is the universal solution for all SIP telephone systems - whether Asterisk, Freeswitch, Auerswald Comtrexx or proprietary systems. Simple, flexible and powerful - with Smart-SIP-Phone you remain optimally reachable and productive. Highlights: - Simple setup - State of the art technology: IPv4 and IPv6. Powerful call functions: - Hold - Mute - Loudspeaker - Selection of the playback device - Parallel calls - Numeric keypad Other functions: - Phone book - Call history - Customizable codecs - Volume control - Bluetooth support - Light & dark mode - 50 free call pushes per month * * Required to receive incoming calls when the app is in the background or your smartphone is locked. For companies: Smart-SIP-Phone is also available as a desktop version. On request, the app can be individually branded and adapted to the needs of your company. Available on request: Seamless integration with ERP and CRM systems. For resellers: The softphone can be branded, customized and discounted as a white-label solution on request - the ideal solution for resellers who want to offer their customers a personalized communication solution. Why Smart-SIP-Phone? Smart-SIP-Phone has been specially developed for all types of SIP telephone systems. It offers a reliable, user-friendly solution for efficient communication - wherever you are. Download now and experience the full power of Smart-SIP-Phone! FAQ Why does the app connect to the EDNT servers? The app downloads the images and data of the supported providers from the EDNT servers at https://nrm.ednt.de. This content is not permanently integrated into the app so that our partners have the opportunity to make changes to the data. #Softclient #SIPclient #Softphone #UCC-Client

Screenshots

Flex Call Manager4 screens

Smart3 screens

Verdict

The call

The clearest difference is iOS requirement: Flex Call Manager at 15.0 against Smart's 18.0. On price, update cadence, ads and in-app purchases 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

Flex Call Manager ships an update monthly, Smart every 3 weeks. The most recent releases landed on October 27, 2026 and October 7, 2026 respectively.

Scorecard1 real difference · 8 level

Flex Call Manager versus Smart: the parameters behind the verdict, then further details
Parameter	Flex Call Manager	Smart
Price	Free	Free
Rating	—	5.0 (1 ratings) — better
Number of ratings	—	1 — better
Update frequency	Monthly	Every 3 weeks — better
Ads	No	No
In-app purchases	No	No
Monetization	—	Free
Devices	iPhone, iPad, iPod, Mac — better	iPhone, iPad, Mac
Requires iOS	15.0 — better	18.0
Further details — not scored
Size	11 MB	6 MB
Age rating	4+	4+
Developer	Gamma Communications GmbH	EDNT GmbH

In-app purchases

None

Flex Call Manager

No in-app purchases

None

Smart

No in-app purchases

Questions

Is Flex Call Manager free?

Flex Call Manager is free to download, with no in-app purchases.

Is Smart free?

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

Do Flex Call Manager or Smart have ads?

Neither Flex Call Manager nor Smart shows ads.

Which is updated more often, Flex Call Manager or Smart?

Flex Call Manager ships an update monthly, and Smart every 3 weeks. Most recently, Flex Call Manager was updated on October 27, 2026 and Smart on October 7, 2026.