When was this checked?

Each tool's listing shows its own date. On this page they run from Oct 5, 2026 to Oct 23, 2026. Integrations are added and withdrawn without notice, so confirm on the tool's own site.

Works with

Apps that work with Thunderbird

8 of the 3189 tools in this directory name Thunderbird among their integrations.

A listing names up to eight integrations, so a tool that is not here may still connect to Thunderbird. Check its own site before you rule it out.

Thunderbird is listed here tooFree · pricing, plans and platforms

To-Do List Apps

Tasks.orgOpen-source Android to-do list with CalDAV and Google Tasks syncFree plan · from $0.99/yr
Todo.txtPlain-text to-do list format with an open-source command-line toolFree
tududiOpen-source task and life organizer to self-host or use hostedFree plan · from €5/mo

Email Apps

Writing Tools

LanguageToolGrammar and style checker for more than 30 languagesFree plan · from $4.99/mo

Email Signature Tools

MySignatureHTML email signature maker with tracking and digital business cardsFree plan · from $6/mo

Common questions

Which to-do list apps work with Thunderbird?: Tasks.org, Todo.txt and tududi name Thunderbird among their integrations. A listing names up to eight, so others may connect to it too.
Which email apps work with Thunderbird?: StartMail, Posteo and Mailfence name Thunderbird among their integrations. A listing names up to eight, so others may connect to it too.
When was this checked?: Each tool's listing shows its own date. On this page they run from Oct 5, 2026 to Oct 23, 2026. Integrations are added and withdrawn without notice, so confirm on the tool's own site.