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Compare K-9 Mail and Thunderbird 
At a Glance
Market Segments
Small-Business (46.2% of reviews)
Small-Business (64.3% of reviews)
Entry-Level Pricing
No pricing available
No pricing available
K-9 Mail
Star Rating
(13)4.5 out of 5
Market Segments
Small-Business (46.2% of reviews)
Pros & Cons
Not enough data
Entry-Level Pricing
No pricing available
Learn more about K-9 MailThunderbird
Star Rating
(335)4.3 out of 5
Market Segments
Small-Business (64.3% of reviews)
Pros & Cons
Entry-Level Pricing
No pricing available
Learn more about ThunderbirdSummary
AI Generated Summary
AI-generated. Powered by real user reviews.
- Users report that K-9 Mail excels in its Unified Inbox feature, scoring 8.9, which allows for seamless management of multiple email accounts in one place, while Thunderbird also offers a Unified Inbox but with slightly less user satisfaction.
- Reviewers mention that K-9 Mail's Filters feature, rated at 8.9, provides robust options for organizing emails, making it easier to manage large volumes of messages, whereas Thunderbird's filtering capabilities, while effective, do not receive the same level of praise.
- G2 users highlight that K-9 Mail's mobile application, with a score of 7.4, is user-friendly but lacks some advanced features found in Thunderbird's desktop application, which scores 9.1, making it a preferred choice for users who prioritize desktop functionality.
- Users on G2 report that K-9 Mail's Calendar integration is rated at 8.4, allowing for effective scheduling, but Thunderbird's integration with Apple Calendar is noted to be more seamless, enhancing user experience for those who rely on Apple products.
- Reviewers mention that K-9 Mail's quality of support is rated at 8.3, which is generally positive, but Thunderbird's support, rated at 7.9, has been criticized for slower response times, impacting user satisfaction.
- Users say that K-9 Mail's email automation features are less developed compared to Thunderbird, which offers more advanced automation tools, making it a better choice for users looking to streamline their email management processes.
Pricing
Entry-Level Pricing
K-9 Mail
No pricing availableThunderbird
No pricing availableFree Trial
K-9 Mail
No trial information availableThunderbird
No trial information availableRatings
Meets Requirements
8.8
11
8.7
300
Ease of Use
8.5
11
8.7
301
Ease of Setup
Not enough data
8.8
72
Ease of Admin
Not enough data
8.4
58
Quality of Support
8.3
8
7.9
221
Has the product been a good partner in doing business?
Not enough data
8.1
41
Product Direction (% positive)
7.1
12
7.7
298
Features by Category
Inbox Tools
Not enough data
8.9
101
Not enough data
8.9
107
Not enough data
8.5
96
Not enough data
8.7
104
Coordination Tools
Not enough data
8.4
90
Not enough data
8.6
99
Not enough data
8.4
88
Software Options
Not enough data
9.1
107
Not enough data
7.6
60
Email Client - Agentic AI
Not enough data
Not enough data
Not enough data
Not enough data
Sorting & Filtering
Not enough data
9.3
7
Not enough data
9.8
7
Not enough data
8.0
5
Not enough data
9.3
7
Integrations
Not enough data
8.6
7
Not enough data
9.0
7
Not enough data
8.1
6
Time Management
Not enough data
9.5
7
Not enough data
8.8
7
Not enough data
9.0
5
Generative AI
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Not enough data
Agentic AI - Email Management
Not enough data
Not enough data
Not enough data
Not enough data
Reviews
Reviewers' Company Size
K-9 Mail
Small-Business(50 or fewer emp.)
Mid-Market(51-1000 emp.)
Enterprise(> 1000 emp.)
Thunderbird
Small-Business(50 or fewer emp.)
Mid-Market(51-1000 emp.)
Enterprise(> 1000 emp.)
Small-Business
(50 or fewer emp.)
Mid-Market
(51-1000 emp.)
Enterprise
(> 1000 emp.)
Reviewers' Industry
Computer Software
15.4%
Venture Capital & Private Equity
7.7%
Translation and Localization
7.7%
Retail
7.7%
Pharmaceuticals
7.7%
Other
53.8%
Information Technology and Services
13.1%
Computer Software
11.9%
Internet
6.7%
Marketing and Advertising
4.9%
Telecommunications
3.0%
Other
60.4%
Discussions
K-9 Mail has no discussions with answers
Has anyone managed to use the copy and paste function from excell?
2 Comments
EC
CONTROL-V or right-click and Paste will keep the cells intact. Right click and "Paste Without Formatting" pastes only the raw data, but not in cells. Read more
Has anyone managed to use the copy and paste function from excell?
1 Comment
BR
Thunderbird does not recognize Excel’s formatting the way Outlook can. But, it can recognize formatting from Word. Copy paste from Excel to Word, then from...Read more
What is the use of Thunderbird software?
1 Comment
SK
It allows you to manage multiple emails in a single window without back and forth switching. That's the main use I found. Besides that, it also has a good...Read more
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