Omnisend vs Substack

as AI assistants see them, week of 2026-09-28

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Omnisend edges out Substack overall, with an overall score of 19 versus 14, and a wider presence at 18 of 59 answers compared to Substack's 11 of 59. Head-to-head, Omnisend was named more often in 8 questions, Substack in 4, with 8 ties. Omnisend was named in every answer for "best email marketing platforms" and "best for an ecommerce store" (3 of 3 each), while Substack was named in every answer for "best newsletter platform" (3 of 3). Claude scores both closely (24 vs 26), but ChatGPT and Perplexity favor Omnisend. Neither tool appears for deliverability or developer API questions.

Head to head

metric	Omnisend	Substack
score	19	14
questions won	8	7

By assistant

Omnisend

assistant	score	named in, this week	usual spot, this week
ChatGPT	12	21% of answers	#6.0
Claude	24	40% of answers	#5.4
Gemini	not sampled this week
Perplexity	20	30% of answers	#4.5

Substack

assistant	score	named in, this week	usual spot, this week
ChatGPT	9	11% of answers	#2.5
Claude	26	35% of answers	#3.4
Gemini	not sampled this week
Perplexity	8	10% of answers	#3.0

Where they differ

Only Omnisend gets named for

What's the best email marketing platform for an ecommerce store?
What's the best email marketing tool for a small business?
What's the best alternative to Mailchimp?
What's the best email platform that segments users by behaviour?
Which email marketing platform is best value for money?

Only Substack gets named for

What's the best newsletter platform?
What's the best email tool for selling a paid newsletter?
What's the best email tool for a newsletter with sponsors and ads?
Which email platform is best for a solo creator?

More comparisons

Not sold on either?

Scores count how often each assistant names a product, weighted by position. How the score works · Full Email marketing platforms leaderboard