Close.io
Close.io is a sales CRM with calling & emailing at its core, with a highly flexible search engine so you can slice & dice your lead data.
Market Share of Close.io
Current Customer(s)
160
Market Share (Est.)
0.08%
Ranking
#13
Top Competitors and Alternatives of Close.io
The top three of Close.io’s competitors in the Email Tracking category are Mailgun with 91.61%, Freshsales with 3.56%, SalesLoft with 2.33% market share.
| Technology | Domains | Market Share (Est.) | Versus page |
|---|---|---|---|
| Mailgun | 191823 | 91.61% | Close.io vs Mailgun |
| Freshsales | 7459 | 3.56% | Close.io vs Freshsales |
| SalesLoft | 4885 | 2.33% | Close.io vs SalesLoft |
| Litmus | 1356 | 0.65% | Close.io vs Litmus |
| Yesware | 786 | 0.38% | Close.io vs Yesware |
| MixMax | 482 | 0.23% | Close.io vs MixMax |
| Cirrus Insight | 429 | 0.20% | Close.io vs Cirrus Insight |
| Pepipost | 323 | 0.15% | Close.io vs Pepipost |
| ClearSlide | 299 | 0.14% | Close.io vs ClearSlide |
| BombBomb | 267 | 0.13% | Close.io vs BombBomb |
| Klenty | 208 | 0.10% | Close.io vs Klenty |
| ContactMonkey | 203 | 0.10% | Close.io vs ContactMonkey |
| Yet Another Mail Merge (YAMM) | 155 | 0.07% | Close.io vs Yet Another Mail Merge (YAMM) |
| Docsify | 60 | 0.03% | Close.io vs Docsify |
| Groupmail | 58 | 0.03% | Close.io vs Groupmail |
| Opensense (formerly SenderGen) | 53 | 0.03% | Close.io vs Opensense (formerly SenderGen) |
| Streak | 50 | 0.02% | Close.io vs Streak |
| SalesHandy | 38 | 0.02% | Close.io vs SalesHandy |
| Ebsta | 35 | 0.02% | Close.io vs Ebsta |
| FollowUp.cc | 32 | 0.02% | Close.io vs FollowUp.cc |
Popular Comparisons
Top Competitors and Alternatives of Close.io
The top three of Close.io’s competitors in the Email Tracking category are Mailgun with 91.61%, Freshsales with 3.56%, SalesLoft with 2.33% market share.
Close.io vs Mailgun
Close.io vs Freshsales
Close.io vs SalesLoft
Close.io vs Litmus
Close.io vs Yesware
Close.io vs MixMax
Close.io vs Cirrus Insight
Close.io vs Pepipost
Customers of Close.io
Around the world in 2026, over 158 companies have started using Close.io as Email Tracking tool.
| Customers | Employee Range | City | Region | Country | Social Links |
|---|---|---|---|---|---|
| 10,000+ | Hamburg | Hamburg | Germany |     | |
| Microsoft | 10,000+ | Redmond | Washington | United States | |
| Upwork | 10,000+ | San Francisco | California | United States | |
| Doterra | 10,000+ | Pleasant Grove | Utah | United States | |
| Housecall Pro | 10,000+ | Denver | Colorado | United States | |
| ProntoPro | 10,000+ | Milan | Lombardy | Italy | |
| Crossover | 5,000 - 9,999 | Austin | Texas | United States | |
| DePaul University | 1,000 - 4,999 | Chicago | Illinois | United States | |
| Toptal | 1,000 - 4,999 | San Francisco | California | United States | |
| Freedom Forever | 1,000 - 4,999 | Temecula | California | United States | |
Uncover hidden demand and identify accounts ready to buy with 6sense Intent Data.
Close.io Customers by Products and Services
The top three products and services offering customers that use Close.io for Email Tracking are Saas (9), Marketing (8), Digital Marketing (8).
Customers
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Close.io Customers by Employee Size
The majority of Close.io's customers for the email-tracking category fall in the company size of 100 - 249 employees (53 companies), 20 - 49 employees (43 companies), 0 - 9 employees (24 companies).
Employee Size
Close.io Customers by Geography
The top three geographies of Close.io for email-tracking are the United States with 90(64.29%), Germany with 13(9.29%), Canada with 8(5.71%) 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 email-tracking category are Mailgun, Freshsales, SalesLoft. 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 Mailgun Close.io vs Freshsales Close.io vs SalesLoft.
What is Close.io customer distribution based on company size?
What is Close.io market share in the email-tracking?
What are the top countries that use Close.io?
What are the top industries that use Close.io?
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