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Best AI Email Assistant for Thunderbird Alternatives in 2026

Updated

20 tools from AI email writing tools ranked against AI Email Assistant for Thunderbird on the same published basis.

  1. 1
    WriteMail.ai Free plan AndroidextensioniOSMacWeb $5/mo7.7
    AI Email Assistant for Thunderbird vs WriteMail.ai
  2. 2
    Ellie Free plan extensionWebWin $19/mo7.5
    AI Email Assistant for Thunderbird vs Ellie
  3. 3
    ForthWrite Free plan apiextensionMacWebWin $24/mo7.5
    AI Email Assistant for Thunderbird vs ForthWrite
  4. 4
    WPS AI Email Writer Free plan AndroidiOSLinuxMacWeb Free7.5
    AI Email Assistant for Thunderbird vs WPS AI Email Writer
  5. 5
    AI Perfect Assistant Free plan AndroidextensioniOSWebWin $16.99/mo7.4
    AI Email Assistant for Thunderbird vs AI Perfect Assistant
  6. 6
    Lavender Free plan extensionWeb $27/mo7.4
    AI Email Assistant for Thunderbird vs Lavender
  7. 7
    Jetwriter AI Free plan extensionWeb $14/mo7.3
    AI Email Assistant for Thunderbird vs Jetwriter AI
  8. 8
    Kerna Free plan MacWebWin €12/mo7.3
    AI Email Assistant for Thunderbird vs Kerna
  9. 9
    MailMaestro Free plan extensionWeb $12/mo7.3
    AI Email Assistant for Thunderbird vs MailMaestro
  10. 10
    Workforce AI Email Drafter Free plan Web $99/mo7.3
    AI Email Assistant for Thunderbird vs Workforce AI Email Drafter
  11. 11
    MailSome Free plan extensionWeb €8.25/mo7.2
    AI Email Assistant for Thunderbird vs MailSome
  12. 12
    Professionally AI Email Writer Free trial extensioniOSMacWebWin $5.40/mo7.2
    AI Email Assistant for Thunderbird vs Professionally AI Email Writer
  13. 13
    GPT for Gmail Free plan AndroidextensioniOSWeb $9/mo7.1
    AI Email Assistant for Thunderbird vs GPT for Gmail
  14. 14
    Xemail AndroidiOSWeb $5.83/mo7.1
    AI Email Assistant for Thunderbird vs Xemail
  15. 15
    Maillifier Free plan self-hostedWeb Free7.0
    AI Email Assistant for Thunderbird vs Maillifier
  16. 16
    Flailo Free plan apiWeb $29/mo6.9
    AI Email Assistant for Thunderbird vs Flailo
  17. 17
    Composer AI Free plan extensionWeb Free6.8
    AI Email Assistant for Thunderbird vs Composer AI
  18. 18
    Demi Free plan Mac $25/mo6.8
    AI Email Assistant for Thunderbird vs Demi
  19. 19
    ReplyCalm Free plan Web $9/mo6.8
    AI Email Assistant for Thunderbird vs ReplyCalm
  20. 20
    InReply Free trial Web £39/mo6.7
    AI Email Assistant for Thunderbird vs InReply

AI Email Assistant for Thunderbird alternatives compared

#ToolScoreFree planFromRuns on
1WriteMail.ai7.7Free plan$5/moAndroid, Browser, iOS, Mac, Web, Windows
2Ellie7.5Free plan$19/moBrowser, Web, Windows
3ForthWrite7.5Free plan$24/moAPI, Browser, Mac, Web, Windows
4WPS AI Email Writer7.5Free planFreeAndroid, iOS, Linux, Mac, Web, Windows
5AI Perfect Assistant7.4Free plan$16.99/moAndroid, Browser, iOS, Web, Windows
6Lavender7.4Free plan$27/moBrowser, Web
7Jetwriter AI7.3Free plan$14/moBrowser, Web
8Kerna7.3Free plan€12/moMac, Web, Windows
9MailMaestro7.3Free plan$12/moBrowser, Web
10Workforce AI Email Drafter7.3Free plan$99/moWeb
11MailSome7.2Free plan€8.25/moBrowser, Web
12Professionally AI Email Writer7.2No$5.40/moBrowser, iOS, Mac, Web, Windows
13GPT for Gmail7.1Free plan$9/moAndroid, Browser, iOS, Web
14Xemail7.1$5.83/moAndroid, iOS, Web
15Maillifier7.0Free planFreeself-hosted, Web
16Flailo6.9Free plan$29/moAPI, Web
17Composer AI6.8Free planFreeBrowser, Web
18Demi6.8Free plan$25/moMac
19ReplyCalm6.8Free plan$9/moWeb
20InReply6.7No£39/moWeb
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Questions about AI Email Assistant for Thunderbird alternatives

What is the best alternative to AI Email Assistant for Thunderbird?

WriteMail.ai, number 1 in AI email writing tools with a score of 7.7 out of 10. The others here: Ellie, ForthWrite, WPS AI Email Writer and 16 more.

What is the best free alternative to AI Email Assistant for Thunderbird?

WriteMail.ai is the best-ranked alternative with a free plan. 17 of the 20 alternatives here publish a free plan on their own pricing pages.

How are these alternatives ranked?

Ranked on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.