Brandwave

Airmail vs Spark:Which is more popular?

In September 2026, Spark had more branded searches than Airmail among email clients worldwide. Spark had about 40,500 branded searches, while Airmail had 14,900. Spark made up 36% of all email client searches we track, and Airmail accounted for 13.2%. When we asked ChatGPT and Google AI Overviews about email clients, Spark appeared in four of the five answers and Airmail in none.

Among email clients worldwide in September 2026

Who do people search for more?

Spark, about 3 searches for every 1 for Airmail

Spark 40.5K searchesAirmail 14.9K searches

Who does AI mention more?

Spark, mentioned in 4 of 5 answers, Airmail in 0

Spark in 4 of 5Airmail in 0 of 5

Who does AI recommend more?

Spark, the only one of the two named

Spark first in 4Airmail never named

Follow Airmail vs Spark 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. Airmail did not appear in any of the five answers.

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 Airmail or Spark more popular in search?

This chart shows how often people search Google for Airmail and Spark 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.

Airmail and Spark among email clients worldwide, by month

Share of searches by month for Spark, Airmail. 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 Airmail and Spark comparison changed over the last 12 months?

3 findings
  • The lead changed hands 2 times in the 12 months ending September 2026: Airmail took it in December 2025, Spark took it in January 2026.
  • Across the 12 months ending September 2026, Airmail’s share of searches among email clients worldwide moved from 19.3% to 13.2%, and its estimated monthly branded searches moved from 22.3K to 14.9K.
  • 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.

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. In September 2026, Airmail lost share of searches among email clients worldwide, from 18.1% to 13.2%.

How are branded searches counted?

4 search terms

Brandwave collects information about searches that people make online using Airmail’s and Spark’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.

Airmail

3 branded search terms

  • airmail client
  • airmail email
  • airmail email client

Spark

1 branded search term

  • spark email

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