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# Mailspring vs Thunderbird Comparison - What are their main differences?

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MailspringThunderbird[+ Add Product](#)

Reviews

**Mailspring** [

3.8/5(18)

](https://www.g2.com/products/mailspring/reviews#reviews)

**Thunderbird** [

4.3/5(340)

](https://www.g2.com/products/thunderbird/reviews#reviews)

Pricing

**Mailspring**
No pricing available

**Thunderbird**
No pricing available

**Pricing Insights**
from reviews

Time to Implement

**Mailspring**
Not enough reviews yet

**Thunderbird**
1 month

Based on 30 responses

Return on Investment

**Mailspring**
Not enough reviews yet

**Thunderbird**
9 months

Based on 17 responses

Perceived Cost

**Mailspring**
Not enough reviews yet

**Thunderbird**
$$$$$

Average Discount

**Mailspring**
Not enough reviews yet

**Thunderbird**
13%

Pros & Cons

**Mailspring**
Not enough data

**Thunderbird**
[
Ease of Use (4)
](https://www.g2.com/products/thunderbird/reviews?filters%5Bsentiment_snippet%5D=1225855&qs=pros-and-cons#reviews)[
Functionality Features (4)
](https://www.g2.com/products/thunderbird/reviews?filters%5Bsentiment_snippet%5D=1225521&qs=pros-and-cons#reviews)[
Difficult Setup (2)
](https://www.g2.com/products/thunderbird/reviews?filters%5Bsentiment_snippet%5D=2064059&qs=pros-and-cons#reviews)[
Missing Features (2)
](https://www.g2.com/products/thunderbird/reviews?filters%5Bsentiment_snippet%5D=2230822&qs=pros-and-cons#reviews)

Ratings

Meets Requirements

**Mailspring**

7.3

7.316

**Thunderbird**

8.7

8.7305

Ease of Use

**Mailspring**

8.8

8.816

**Thunderbird**

8.8

8.8306

Ease of Setup

**Mailspring**
Not enough data

**Thunderbird**

8.8

8.876

Ease of Admin

**Mailspring**
Not enough data

**Thunderbird**

8.4

8.458

Quality of Support

**Mailspring**

7.1

7.18

**Thunderbird**

7.9

7.9222

Has the product been a good partner in doing business?

**Mailspring**
Not enough data

**Thunderbird**

8.1

8.141

Product Direction (% positive)

**Mailspring**

6.1

6.115

**Thunderbird**

7.7

7.7303

Features

Email Client[Hide 11 FeaturesShow 11 Features](javascript:void(0);)

8.4

12

8.5

124

Inbox Tools

Unified Inbox

9.2(won by 0.3)

11

8.9

104

Filters

7.3

10

9.0(won by 1.7)

110

 (There is a greater than 0.5 difference between this product's rating and its competitors)

Reminders

8.6(won by 0.1)

7

8.5

97

Notifications

8.6

11

8.7(won by 0.1)

105

Coordination Tools

Calendar

8.6(won by 0.1)

7

8.5

94

Contacts

7.5

10

8.6(won by 1.1)

102

 (There is a greater than 0.5 difference between this product's rating and its competitors)

Task Management

9.7(won by 1.3)

6

 (There is a greater than 0.5 difference between this product's rating and its competitors)

8.4

89

Software Options

Desktop Application

7.8

12

9.2(won by 1.4)

111

 (There is a greater than 0.5 difference between this product's rating and its competitors)

Mobile Application

Not enough data

7.6(won by default)

65

Email Client - Agentic AI

Cross-system Integration

Not enough data

8.0(won by default)

5

Autonomous Task Execution

Not enough data

Not enough data

Email Management[Hide 62 FeaturesShow 62 Features](javascript:void(0);)

Not enough data

8.9

10

Sorting & Filtering

Attachment Search

Not enough data

9.2(won by default)

6

Tags

Not enough data

9.8(won by default)

8

AI Sorting

Not enough data

8.0(won by default)

5

Predefined Rules

Not enough data

9.2(won by default)

6

Integrations

Microsoft Outlook Integration

Not enough data

8.3(won by default)

6

Gmail Integration

Not enough data

9.0(won by default)

7

Apple Calendar Integration

Not enough data

8.1(won by default)

6

Social Media Integration

Not enough data

Not enough data

Third-Party Integrations

Not enough data

Not enough data

Time Management

Unified Inbox

Not enough data

9.4(won by default)

6

Email Automation

Not enough data

8.8(won by default)

7

Snooze

Not enough data

9.0(won by default)

5

Generative AI

AI Text Generation

Not enough data

Not enough data

AI Text-to-Speech

Not enough data

Not enough data

AI Text Summarization

Not enough data

Not enough data

Generative AI

Not enough data

Not enough data

Agentic AI - Email Management

Autonomous Task Execution

Not enough data

Not enough data

Cross-system Integration

Not enough data

Not enough data

Additional Functionality

Whitelisting/Blacklisting

Not enough data

Not enough data

Customizable Fields

Not enough data

Not enough data

Signature Management

Not enough data

Not enough data

Shared Inboxes

Not enough data

Not enough data

Email Distribution

Not enough data

Not enough data

Prioritization

Not enough data

Not enough data

Customizable Forms

Not enough data

Not enough data

AI Copilot

Not enough data

Not enough data

Mobile App

Not enough data

Not enough data

Routing

Not enough data

Not enough data

Activity Dashboard

Not enough data

Not enough data

Collaboration Tools

Not enough data

Not enough data

Inbox Management

Not enough data

Not enough data

Queue Management

Not enough data

Not enough data

Drag & Drop

Not enough data

Not enough data

Contact Management

Not enough data

Not enough data

Email Marketing

Not enough data

Not enough data

Data Recovery

Not enough data

Not enough data

Archiving & Retention

Not enough data

Not enough data

Real-Time Monitoring

Not enough data

Not enough data

Autoresponders

Not enough data

Not enough data

Multiple User Accounts

Not enough data

Not enough data

API

Not enough data

Not enough data

Real-Time Analytics

Not enough data

Not enough data

Customer Segmentation

Not enough data

Not enough data

Search/Filter

Not enough data

Not enough data

Support Ticket Management

Not enough data

Not enough data

Canned Responses

Not enough data

Not enough data

Workflow Management

Not enough data

Not enough data

Reporting/Analytics

Not enough data

Not enough data

Chat/Messaging

Not enough data

Not enough data

Response Management

Not enough data

Not enough data

Email Templates

Not enough data

Not enough data

Email Monitoring

Not enough data

Not enough data

Campaign Management

Not enough data

Not enough data

Email Tracking

Not enough data

Not enough data

Access Controls/Permissions

Not enough data

Not enough data

Spam Blocker

Not enough data

Not enough data

Alerts/Notifications

Not enough data

Not enough data

Customizable Templates

Not enough data

Not enough data

Real-Time Reporting

Not enough data

Not enough data

Tagging

Not enough data

Not enough data

Campaign Analytics

Not enough data

Not enough data

Workflow Automation

Not enough data

Not enough data

Show 1 feature category with incomplete data

Collaboration & Productivity[Hide 45 FeaturesShow 45 Features](javascript:void(0);)

Not enough data

Not enough data

Additional Functionality

Third-Party Integrations

Not enough data

Not enough data

To-Do List

Not enough data

Not enough data

@mentions

Not enough data

Not enough data

Single Sign On

Not enough data

Not enough data

File Management

Not enough data

Not enough data

Activity Dashboard

Not enough data

Not enough data

Drag & Drop

Not enough data

Not enough data

Alerts/Notifications

Not enough data

Not enough data

Prioritization

Not enough data

Not enough data

Access Controls/Permissions

Not enough data

Not enough data

Screen Sharing

Not enough data

Not enough data

Content Management

Not enough data

Not enough data

Brainstorming

Not enough data

Not enough data

AI Copilot

Not enough data

Not enough data

File Transfer

Not enough data

Not enough data

Calendar Management

Not enough data

Not enough data

Status Tracking

Not enough data

Not enough data

Real-Time Notifications

Not enough data

Not enough data

Version Control

Not enough data

Not enough data

Task Management

Not enough data

Not enough data

Activity Tracking

Not enough data

Not enough data

Real Time Editing

Not enough data

Not enough data

Communication Management

Not enough data

Not enough data

Chat/Messaging

Not enough data

Not enough data

Tagging

Not enough data

Not enough data

Generative AI

Not enough data

Not enough data

Assignment Management

Not enough data

Not enough data

Task Scheduling

Not enough data

Not enough data

Project Management

Not enough data

Not enough data

Collaboration Tools

Not enough data

Not enough data

Workflow Management

Not enough data

Not enough data

Secure Data Storage

Not enough data

Not enough data

File Sharing

Not enough data

Not enough data

Document Storage

Not enough data

Not enough data

Task Progress Tracking

Not enough data

Not enough data

Discussions/Forums

Not enough data

Not enough data

Commenting/Notes

Not enough data

Not enough data

Reporting & Statistics

Not enough data

Not enough data

Contact Management

Not enough data

Not enough data

Video Conferencing

Not enough data

Not enough data

Progress Tracking

Not enough data

Not enough data

Mobile Access

Not enough data

Not enough data

API

Not enough data

Not enough data

Document Management

Not enough data

Not enough data

Customizable Branding

Not enough data

Not enough data

User Insights

Reviewers' Company Size

[![Mailspring](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_372e8e791c2465519b28ae545a998993/mailspring.jpg "Mailspring")](https://www.g2.com/products/mailspring/reviews)

Mailspring

Small-Business(50 or fewer emp.)

64.7%

Mid-Market(51-1000 emp.)

11.8%

Enterprise(\> 1000 emp.)

23.5%

[![Thunderbird](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_6ca5b57b63c45814e9ef66a64ca43c19/thunderbird.png "Thunderbird")](https://www.g2.com/products/thunderbird/reviews)

Thunderbird

Small-Business(50 or fewer emp.)

65.2%

Mid-Market(51-1000 emp.)

24.3%

Enterprise(\> 1000 emp.)

10.5%

Small-Business

(50 or fewer emp.)

64.7%

65.2%

Mid-Market

(51-1000 emp.)

11.8%

24.3%

Enterprise

(\> 1000 emp.)

23.5%

10.5%

Reviewers' Industry

[![Mailspring](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_372e8e791c2465519b28ae545a998993/mailspring.jpg "Mailspring")](https://www.g2.com/products/mailspring/reviews)
Mailspring

Computer Software

29.4%

Information Technology and Services

17.6%

Utilities

5.9%

Transportation/Trucking/Railroad

5.9%

Marketing and Advertising

5.9%

Other

35.3%

[![Thunderbird](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_6ca5b57b63c45814e9ef66a64ca43c19/thunderbird.png "Thunderbird")](https://www.g2.com/products/thunderbird/reviews)
Thunderbird

Information Technology and Services

12.9%

Computer Software

11.7%

Internet

6.6%

Marketing and Advertising

5.1%

Telecommunications

3.3%

Other

60.4%

FAQs

## Mailspring vs Thunderbird FAQs

Generated using AI

Last updated: August 14, 2026

### What is the difference between Thunderbird vs Mailspring?

Thunderbird stands out from Mailspring with a higher G2 rating, broader review base, and stronger reviewer-cited strengths in functionality and support.

| [Thunderbird](https://www.g2.com/products/thunderbird/reviews) | [Mailspring](https://www.g2.com/products/mailspring/reviews) |
| --- | --- |
| 4.3/5 (340 reviews) | 3.8/5 (18 reviews) |
| Small-Business | Small-Business |
| 8.8 | — |
| 7.9 | 7.1 |
| Functionality Features (4 all-time mentions) | — |

### How do the pricing models of Thunderbird and Mailspring compare?

Thunderbird is considered the stronger value by reviewers, with higher satisfaction on price and cost-related dimensions.

- **Thunderbird:** Reviewers consistently highlight Thunderbird as a free, open-source solution with strong ROI and no subscription fees for core features.
- **Mailspring:** Reviewers note Mailspring offers a free tier with limitations on the number of accounts and some features gated behind paid plans.
- **Switching reasons:** Recent reviewers cite Thunderbird's cost-free model and extensive features as key reasons for switching from paid or limited alternatives.

### What are the best alternatives to Thunderbird and Mailspring?

The top 3 alternatives to Thunderbird and Mailspring are Outlook, Front, and Spike.

| Product | G2 Rating (reviews) | Largest Segment | Pricing Insight | Top Reviewer-Cited Strength |
| --- | --- | --- | --- | --- |
| [Thunderbird](https://www.g2.com/products/thunderbird/reviews) | 4.3/5 (340 reviews) | Small-Business | Free, open-source, strong ROI | Functionality Features (4 all-time mentions) |
| [Mailspring](https://www.g2.com/products/mailspring/reviews) | 3.8/5 (18 reviews) | Small-Business | Free tier with limitations | — |
| [Outlook](https://www.g2.com/products/microsoft-outlook/reviews) | 4.5/5 (3,522 reviews) | Enterprise | — | Robust enterprise-grade features |
| [Front](https://www.g2.com/products/front/reviews) | 4.7/5 (2,507 reviews) | Small-Business | — | Collaborative inbox management |
| [Spike](https://www.g2.com/products/spike/reviews) | 4.6/5 (262 reviews) | Small-Business | — | Conversational email interface |

### Which Email Client features should I prioritize when comparing Thunderbird and Mailspring?

Buyers should prioritize multi-account management, ease of setup, security, customization, and integration capabilities when comparing Thunderbird and Mailspring.

- **Multi-account management:** Thunderbird is frequently cited for handling multiple accounts efficiently; Mailspring reviewers also mention unified inbox features.
- **Ease of setup:** Thunderbird scores 8.8; Mailspring's score is not available, but reviewers note easy initial configuration.
- **Security:** Thunderbird has 2 all-time mentions for security; Mailspring reviewers highlight secure mailbox and virus alerts.
- **Customization:** Thunderbird is praised for themes, add-ons, and deep configuration; Mailspring offers themes and layout options.
- **Integration capabilities:** Thunderbird supports calendar, contacts, and task integrations; Mailspring reviewers mention CRM and social media integrations.

### What are the pros and cons of Thunderbird vs Mailspring?

Thunderbird's headline strength is its robust functionality and customization, while Mailspring is noted for its modern interface and unified inbox.

- **Thunderbird strengths:** Functionality Features (4 all-time mentions), Ease of Use (4), Security (2), Inbox Management (2), Customization and add-ons, Multi-account support, Free and open-source.
- **Thunderbird trade-offs:** Difficult Setup (2), Missing Features (2), Sync Issues (2), Learning curve for advanced features, Occasional UI modernization requests.
- **Mailspring strengths:** Modern interface, Unified inbox, Email tracking, Multi-platform support, Quick setup for multiple accounts.
- **Mailspring trade-offs:** Syncing problems, Limited filtering and bulk actions, No address book, Some features gated behind paid plans, Lower support satisfaction (7.1 vs Thunderbird's 7.9).

### Is Thunderbird or Mailspring better for small businesses?

Thunderbird is the better fit for small businesses, with a larger small-business reviewer base and stronger sentiment for multi-account management and cost-effectiveness.

- **Thunderbird:** Largest segment is Small-Business; reviewers highlight ease of managing multiple business accounts, strong filtering, and free implementation.
- **Mailspring:** Largest segment is Small-Business; reviewers note ease of setup and unified inbox, but mention syncing issues and feature limitations for business use.

### Which Email Client platform has better integrations?

Thunderbird and Mailspring are at parity for integrations, with no recent reviewer-cited third-party integrations named for either product.

- **Thunderbird:** No specific integrations cited in recent reviews.
- **Mailspring:** No specific integrations cited in recent reviews.

### How do Thunderbird and Mailspring compare on customer support?

Thunderbird has a higher Quality of Support score than Mailspring by 0.8 points, a material difference favoring Thunderbird.

- **Thunderbird:** Quality of Support score is 7.9; reviewers mention active community forums, helpful documentation, and consistent updates, though some note the absence of a dedicated support team.
- **Mailspring:** Quality of Support score is 7.1; reviewers describe mixed experiences, with some positive billing resolution but others citing slow or limited support responses.

### Which is easier to implement, Thunderbird or Mailspring?

Thunderbird leads on Ease of Setup with a score of 8.8, while Mailspring's score is not available, but reviewers note easy initial configuration for both products.

- **Thunderbird:** Reviewers consistently rate setup as straightforward, with scores of 7.0 in multiple recent reviews and praise for account autodiscovery and documentation.
- **Mailspring:** Reviewers describe setup as quick and easy, especially for multiple accounts, but some mention syncing issues post-setup.

Alternatives

**Mailspring Alternatives**

 ![Microsoft Outlook](https://images.g2crowd.com/uploads/product/hd_favicon/5c440ee40ed0f9d1e1c0575dbdd12898/microsoft-outlook.png "Microsoft Outlook")

[
Outlook
](/products/microsoft-outlook/reviews)

 ![Spike](https://images.g2crowd.com/uploads/product/hd_favicon/ad8d6b14c633bf13965f58ef40a77f0f/spike.svg "Spike")

[
Spike
](/products/spike/reviews)

 ![Mailbird](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_53eb6f8d708e7c322d572e28b89709cc/mailbird.png "Mailbird")

[
Mailbird
](/products/mailbird/reviews)

 ![eM Client](https://images.g2crowd.com/uploads/product/hd_favicon/279347ac57ba92081663a3e86d7b6132/em-client.svg "eM Client")

[
eM Client
](/products/em-client/reviews)

**Thunderbird Alternatives**

 ![Front](https://images.g2crowd.com/uploads/product/hd_favicon/1fe01c88159eb52ed7e93d98cdce08a5/front.svg "Front")

[
Front
](/products/front/reviews)

 ![Spike](https://images.g2crowd.com/uploads/product/hd_favicon/ad8d6b14c633bf13965f58ef40a77f0f/spike.svg "Spike")

[
Spike
](/products/spike/reviews)

 ![Mailbird](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_53eb6f8d708e7c322d572e28b89709cc/mailbird.png "Mailbird")

[
Mailbird
](/products/mailbird/reviews)

 ![BlueMail](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_ea674f9d92a760d473952ccec1d4bc02/bluemail.jpg "BlueMail")

[
BlueMail
](/products/bluemail/reviews)

## Mailspring vs Thunderbird

- Reviewers felt that Thunderbird meets the needs of their business better than Mailspring.
- When comparing quality of ongoing product support, reviewers felt that Thunderbird is the preferred option.
- For feature updates and roadmaps, our reviewers preferred the direction of Thunderbird over Mailspring.