Instantly vs Warmup Inbox:Which is more popular?
In September 2026, Warmup Inbox had more branded searches than Instantly among email warmup tools worldwide. Warmup Inbox had about 3,600 branded searches, while Instantly had 650. Warmup Inbox made up 5.8% of all email warmup tool searches we track, and Instantly accounted for 1%. When we asked ChatGPT and Google AI Overviews about email warmup tools, Instantly appeared in four of the five answers and Warmup Inbox in three. Instantly was mentioned before Warmup Inbox in every answer.
Who do people search for more?
Warmup Inbox, about 6 searches for every 1 for Instantly
Who does AI mention more?
Instantly, mentioned in 4 of 5 answers, Warmup Inbox in 3
Who does AI recommend more?
Instantly, named ahead of Warmup Inbox in every answer
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Top email warmup tools in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Instantly was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. Warmup Inbox was mentioned in three out of five: in two of the three ChatGPT answers and in one of the two Google AI Overviews. Instantly was listed before Warmup Inbox in every answer.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
Lemwarm4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers- Instantly4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Smartlead3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
MailReach3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers- Warmup Inbox3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Warmy2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Warmbox1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about email warmup tools
5 answers
Asked ChatGPT
“Which email warmup tool should I use?”
Asked ChatGPT
“What are the best email warmup tools?”
Asked ChatGPT
“What's the best email warmup tool for a new sending domain?”
Searched Google, AI Overview
“email warmup tool”
Searched Google, AI Overview
“email deliverability tool”
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Is Instantly or Warmup Inbox more popular in search?
This chart shows how often people search Google for Instantly and Warmup Inbox by name. Each line represents a brand's share of searches for all seven email warmup tools we track, month by month, from English-language searches worldwide.
Share of searches by month for Warmup Inbox, Instantly. The figures are in the table below the chart.
View monthly share of searches table
| Month | Smartlead | Warmy | MailReach | Warmup Inbox | Lemwarm | Warmbox | Instantly |
|---|---|---|---|---|---|---|---|
| Oct 2025 | 52.5% | 15.7% | 8.5% | 5.6% | 10.5% | 5.6% | 1.6% |
| Nov 2025 | 46.1% | 25.2% | 7.5% | 4.9% | 7.5% | 7.5% | 1.3% |
| Dec 2025 | 31.6% | 47.1% | 6.3% | 5.1% | 6.3% | 2.7% | 0.88% |
| Jan 2026 | 48.6% | 21.7% | 7.9% | 6.5% | 9.7% | 4.3% | 1.4% |
| Feb 2026 | 48.3% | 21.6% | 9.6% | 5.2% | 9.6% | 4.3% | 1.4% |
| Mar 2026 | 56.2% | 13.7% | 9.2% | 6.1% | 9.2% | 4.1% | 1.6% |
| Apr 2026 | 57.4% | 11.5% | 11.5% | 6.2% | 7.6% | 4.2% | 1.6% |
| May 2026 | 60.2% | 12% | 9.8% | 5.3% | 8% | 3.5% | 1.2% |
| Jun 2026 | 61.7% | 10.1% | 10.1% | 6.7% | 6.7% | 3.5% | 1.3% |
| Jul 2026 | 62.5% | 10.2% | 10.2% | 6.8% | 5.5% | 3.6% | 1.2% |
| Aug 2026 | 61.1% | 10% | 10% | 8.1% | 5.4% | 4.4% | 1.1% |
| Sep 2026 | 64.7% | 10.6% | 8.6% | 5.8% | 4.6% | 4.6% | 1% |
How has the Instantly and Warmup Inbox comparison changed over the last 12 months?
3 findings
- Warmup Inbox was ahead of Instantly in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Instantly’s share of searches among email warmup tools worldwide moved from 1.6% to 1%, and its estimated monthly branded searches moved from 800 to 650.
- Across the 12 months ending September 2026, Warmup Inbox’s share of searches among email warmup tools worldwide moved from 5.6% to 5.8%, and its estimated monthly branded searches moved from 2.9K to 3.6K.
How did search popularity change for email warmup tools worldwide in September 2026?
2 changes
In September 2026, Warmup Inbox lost share of searches among email warmup tools worldwide, from 8.1% to 5.8%.
Estimated monthly branded searches for Instantly worldwide fell 18.8% over 12 measured months, from 800 to 650 in September 2026.
How are branded searches counted?
4 search terms
Brandwave collects information about searches that people make online using Instantly’s and Warmup Inbox’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.
Instantly
3 branded search terms
- instantly ai
- instantly cold email
- instantlyai
Warmup Inbox
1 branded search term
- warmup inbox
Other head-to-heads among email warmup tools
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