Growth · alternatives · 2026

24 alternatives to Send Check It Subject Line Tester

Write better email subjects with this tool

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Send Check It Subject Line Tester launched in 2017; newer entries below may have overtaken it.

1. 1SI
   Should I Send It? Helping you understand your mood in emails▲91

   2018 · shouldisendit.com · its alternatives →

2. 2
   Mail Tester▲309

   Test the spamminess of your email

   2016 · mail-tester.com · its alternatives →

3. 3
   MailerCheck 2.0▲145

   All-in-one email deliverability platform for businesses

   2023 · mailercheck.com · its alternatives →

4. 4
   Email Testing By Inbox Pirates▲355

   Preview, analyze & test emails with one click

   2022 · inboxpirates.com · its alternatives →

5. 5
   Cold Email Analyzer by Mailshake▲222

   Real-time analysis of email subject lines and copy

   2018 · mailshake.com · its alternatives →

6. 6
   Email Subject Line Generator▲130

   Instantly generate catchy email subject lines

   2023 · subjectlinegenerator.com · its alternatives →

7. 7
   Email subject line tester▲7

   Testing tool for email marketing, previews the subject line.

   2018 · emailtooltester.com · its alternatives →

8. 8
   TestSubject▲133

   Test how your email subject line displays on mobile devices.

   2016 · zurb.com · its alternatives →

9. 9
   Everything Email Podcast - Subject Lines▲62

   Ever wonder why one subject line works and another doesn’t?

   2016 · soundcloud.com · its alternatives →

10. 10
    Email Characters▲74

    Determine if your subject line will cut off on devices

    2021 · emailcharacters.com · its alternatives →

11. 11
    Ortto AI Subject Line Writer▲95

    Predict open rate before you send an email

    2022 · ortto.com · its alternatives →

12. 12
    Mailnest▲100

    Sandbox Email testing tool for IT product, service companies

    2020 · mailnest.io · its alternatives →

13. 13
    Free AI Email Subject Line Generator▲174

    Create impactful unique subject lines using AI and GPT-3

    2021 · encharge.io · its alternatives →

14. 14
    AI Subject Line Generator▲96

    Generate a brilliant subject line in seconds, with GPT

    2023 · ecosend.io · its alternatives →

15. 15
    PutsMail▲195

    Test your HTML emails before sending them

    2015 · putsmail.com · its alternatives →

16. 16
    Litmus▲100

    Test and track your emails.

    2014 · litmus.com · its alternatives →

17. 17
    Email Subject Line Analyzer▲6

    Will you stand out in the inbox and get more opens?

    2017 · sendcheckit.com · its alternatives →

18. 18
    Analyze My Writing▲160

    Text content and readability analyzer

    2015 · analyzemywriting.com · its alternatives →

19. 19
    Send Check It▲156

    Stop sending email with bad: links, images and *FNAME*s

    2017 · sendcheckit.com · its alternatives →

20. 20
    Weecheck v2▲100

    Simple email verification to improve deliverability

    2022 · its alternatives →

21. 21
    SellScale Email Grader▲117

    Get instant feedback on your sales emails

    2024 · sellscale.com · its alternatives →

22. 22
    Litmus Subject Line Checker▲5

    Preview your subject line in 15+ email clients in real time

    2016 · litmus.com · its alternatives →

23. 23
    analyze.email▲136

    Test the spam-y-ness of your emails

    2017 · analyze.email · its alternatives →

24. 24
    Cold Email Subject Line Generator▲124

    Get them to read your cold emails.

    2020 · mails.wtf · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →