
Microsoft Outlook
Mailbird
eM Client
Postbox
Apple Mail
Mailspring
Spark Mail
Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Pipedrive
Zoho CRM
HubSpot
Insightly
Salesforce
HubSpot CRM
Freshsales CRM
A CRM with built-in calling, SMS, and email

Which is more popular?
Based on our record, Close seems to be more popular. It has been mentioned 8 times since March 2021.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | thunderbird.net | close.com |
| Pricing | — | |
| Company | — | Startup from the United States |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of Thunderbird yet.
Overall verdict
Why this product is good
Recommended for
Close is ideal for sales-driven organizations, especially small to medium-sized enterprises (SMEs) that require efficient lead management, streamlined communication, and actionable insights to enhance their sales performance.
Walkthroughs and reviews on video.
Thunderbird Review Holiday World Launched Wing Coaster
More videos
Close Netflix Review
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Thunderbird and Close. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Mozilla Thunderbird is an open-source email client developed by the Mozilla community. For people who like having their email offline, a range of customization options, robust data protection and privacy features, and...
Thunderbird’s interface takes a hint from Mozilla Firefox and other popular browsers and lets you open multiple emails in separate tabs. There are a lot of options to customize the look and feel of your inbox, as well...
Thunderbird is an open-source, cross-platform email suite. It is one of the best Mac mail applications that provides easy to use wizard for setting account. This software helps you to personalize the email the way you...
Switching Move from Close in a day. 012 minutes Connect Close Paste a Close API key in Settings → Migration. Leadey checks it and reads your account; nothing changes in Close. 025 minutes Choose what to bring Pick the...
Recommendations tracked on public social media and blogs since March 2021.


Tracking Thunderbird since Mar 2021.
Close (https://close.com) | Multiple Product & Engineering Roles | REMOTE (US) Close is a bootstrapped, profitable, completely remote, ~90 person team of thoughtful individuals who value autonomy and impact. Since 2013, we’ve been... - Source: Hacker News / over 2 years ago
Close (https://close.com) | Multiple Product & Engineering Roles | REMOTE (US) Close is a bootstrapped, profitable, completely remote, ~90 person team of thoughtful individuals who value autonomy and impact. Since 2013, we’ve been... - Source: Hacker News / almost 3 years ago
This sign-up sales email from Close.io (now close.com) will likely increase your conversion rate. Here's why it works well:. Source: over 3 years ago
When comparing Thunderbird and Close, you can also consider the following products.

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
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Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.
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Mailbird is the best email client for Windows 7, 8 and 10
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eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
Compare eM Client to Thunderbird or Close:

Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
Compare HubSpot to Thunderbird or Close: