Close.io
Close.io, With built-in calling, SMS, and email all in one platform, Close.io is designed to help the customer close more deals.
Market Share of Close.io
Current Customer(s)
157
Market Share (Est.)
0.08%
Ranking
#35
Top Competitors and Alternatives of Close.io
The top three of Close.io’s competitors in the VoIP And SIP category are CallRail with 21.14%, Skype with 19.18%, Cisco WebEx with 15.37% market share.
Popular Comparisons
Top Competitors and Alternatives of Close.io
The top three of Close.io’s competitors in the VoIP And SIP category are CallRail with 21.14%, Skype with 19.18%, Cisco WebEx with 15.37% market share.
Close.io vs CallRail
Close.io vs Skype
Close.io vs Cisco WebEx
Close.io vs Cisco VoIP
Close.io vs Genesys PureCloud
Close.io vs Google Voice
Close.io vs Cisco Unified Communications Manager (CallManager)
Close.io vs RingCentral
Customers of Close.io
Around the world in 2026, over 157 companies have started using Close.io as VoIP And SIP tool.
| Customers | Employee Range | City | Region | Country | Social Links |
|---|---|---|---|---|---|
| Upwork | 10,000+ | San Francisco | California | United States |     |
| 10,000+ | Hamburg | Hamburg | Germany | | |
| ProntoPro | 10,000+ | Milan | Lombardy | Italy | |
| Doterra | 10,000+ | Pleasant Grove | Utah | United States | |
| Microsoft | 10,000+ | Redmond | Washington | United States | |
| Kaseya | 5,000 - 9,999 | Miami | Florida | United States | |
| Crossover | 5,000 - 9,999 | Austin | Texas | United States | |
| Housecall Pro | 1,000 - 4,999 | Denver | Colorado | United States | |
| DePaul University | 1,000 - 4,999 | Chicago | Illinois | United States | |
| Toptal | 1,000 - 4,999 | San Francisco | California | United States | |
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Close.io Customers by Products and Services
The top three products and services offering customers that use Close.io for VoIP And SIP are Digital Marketing (9), Marketing (8), Saas (7).
Customers
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Close.io Customers by Employee Size
The majority of Close.io's customers for the voip category fall in the company size of 100 - 249 employees (50 companies), 20 - 49 employees (37 companies), 0 - 9 employees (25 companies).
Employee Size
Close.io Customers by Geography
The top three geographies of Close.io for voip are the United States with 88(64.71%), Germany with 12(8.82%), Canada with 8(5.88%) customers respectively.
Customers
Employees of Close.io
Also see other Products/Services by Close.io in:
FAQ
Find answers to the most often asked questions by users.
Who are the top Close.io competitors?
Close.io’s Top competitors in the voip category are CallRail, Skype, Cisco WebEx. You can view a full list of Close.io competitors here. 6sense uses advanced data mining and AI algorithms to track customers and competitors of Close.io and 40,000 other technologies on the internet. You can also compare Close.io and its feature with top competitors here : Close.io vs CallRail Close.io vs Skype Close.io vs Cisco WebEx.
What is Close.io customer distribution based on company size?
What is Close.io market share in the voip?
What are the top countries that use Close.io?
What are the top industries that use Close.io?
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