Brandwave

Spark vs Superhuman:Which is more popular?

In September 2026, Spark had more branded searches than Superhuman among email clients worldwide. Spark had about 40,500 branded searches, while Superhuman had 27,000. Spark made up 36% of all email client searches we track, and Superhuman accounted for 24%. When we asked ChatGPT and Google AI Overviews about email clients, Spark appeared in four of the five answers and Superhuman in three. Spark was mentioned before Superhuman in every answer that named either.

Among email clients worldwide in September 2026

Who do people search for more?

Spark, about 50% more searches than Superhuman

Spark 40.5K searchesSuperhuman 27K searches

Who does AI mention more?

Spark, mentioned in 4 of 5 answers, Superhuman in 3

Spark in 4 of 5Superhuman in 3 of 5

Who does AI recommend more?

Spark, named ahead of Superhuman in 4 of 4 answers

Spark first in 4Superhuman never first

Follow Spark vs Superhuman and get free monthly updates on what changed

By continuing you'll get index updates and occasional product news from Brandwave. Unsubscribe any time. Privacy

Track your brand against a rival →

Top email clients in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Spark was mentioned in four out of five: in two of the three ChatGPT answers and in both Google AI Overviews. Superhuman was mentioned in three out of five: in two of the three ChatGPT answers and in one of the two Google AI Overviews. Spark was listed before Superhuman in every answer that named either.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. Spark1st
  2. Thunderbird2nd
  3. Proton Mail3rd
  4. Superhuman4th
  5. Airmail–
  6. Newton–

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • Spark4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Thunderbird4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Superhuman3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Proton Mail3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Airmail0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Newton0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers

See every answer about email clients

5 answers

Not named in any answer:

Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.

Is Spark or Superhuman more popular in search?

This chart shows how often people search Google for Spark and Superhuman by name. Each line represents a brand's share of searches for all six email clients we track, month by month, from English-language searches worldwide.

Spark and Superhuman among email clients worldwide, by month

Share of searches by month for Spark, Superhuman. The figures are in the table below the chart.

View monthly share of searches table
MonthSparkThunderbirdSuperhumanAirmailNewtonProton Mail
Oct 202523.5%36.1%20.2%19.3%0.76%0.12%
Nov 202521.6%34.5%25.1%17.7%0.97%0.14%
Dec 202520.2%34%23.8%20.3%1.5%0.13%
Jan 202618.6%38.3%26.8%15.3%0.84%0.14%
Feb 202614.6%39%33.3%12%0.99%0.17%
Mar 202615.6%36.5%34.1%12.8%0.76%0.18%
Apr 202615.6%36.5%33.5%12.8%1.4%0.15%
May 202616.8%34.7%36.4%11.3%0.67%0.16%
Jun 202621.4%29.6%27.7%17.6%3.5%0.2%
Jul 202620.7%35%29.1%13.9%1.1%0.24%
Aug 202622%35.2%23.7%18.1%0.71%0.26%
Sep 202636%25.9%24%13.2%0.64%0.28%

How has the Spark and Superhuman comparison changed over the last 12 months?

3 findings
  • The lead changed hands 2 times in the 12 months ending September 2026: Superhuman took it in November 2025, Spark took it in September 2026.
  • Across the 12 months ending September 2026, Spark’s share of searches among email clients worldwide moved from 23.5% to 36%, and its estimated monthly branded searches moved from 27.1K to 40.5K.
  • Across the 12 months ending September 2026, Superhuman’s share of searches among email clients worldwide moved from 20.2% to 24%, and its estimated monthly branded searches moved from 23.4K to 27K.

How did search popularity change for email clients worldwide in September 2026?

2 changes

  1. In September 2026, Spark overtook Thunderbird and Superhuman to become the leader among email clients worldwide, with 36% of the searches.

  2. Estimated monthly branded searches for Superhuman worldwide rose 15.6% over 12 measured months, from 23.4K to 27K in September 2026.

How are branded searches counted?

5 search terms

Brandwave collects information about searches that people make online using Spark’s and Superhuman’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.

Spark

1 branded search term

  • spark email

Superhuman

4 branded search terms

  • superhuman ai
  • superhuman ai email assistant
  • superhuman email
  • superhuman email client

How the Brand Demand Index is measured

Other head-to-heads among email clients

Creator with pink hair and a pink jacket

Put your own brand in this comparison

Brandwave tracks your branded demand next to the rival you actually watch, with your campaigns, spend and outcomes on the same timeline.

Start free