Companies Using SendGrid

With 10+ years in web crawling and technographic data analysis, I've examined SendGrid's growth trajectory and customer profile using our 227,767 enriched company dataset, as of our August 2026 crawl at TechnologyChecker.io. We matched SendGrid domains against LinkedIn company profiles to uncover who actually uses the platform and what happened after the free tier removal. For broader email marketing trends, see our Marketing Automation Market Share Report.

Growth Trajectory

SendGrid went from 742 active domains in August 2012 to 186,316 in April 2025, a 251x climb over 13 years in our long-run detection history. The sharpest jump happened in May 2016, when active domains exploded from 7,722 to 30,103 in a single month. Twilio's 2019 acquisition fueled another wave, pushing active domains past 100,000 by early 2020.

After that April 2025 peak, active domains fell to 177,595 by July 2025, a 4.7% decline in three months, timed almost exactly to SendGrid's free tier removal on July 26, 2025. Read that as a one-off shedding of free accounts, not a trend: We now detect SendGrid on 328,176 active domains, and the month-over-month move is flat (326,519 in July 2026, 328,176 in August). The two figures are not like-for-like, because the set of domains we crawl turns over every month, with dead sites dropping out and newly discovered ones added, and our detection signals widen over time, so treat the step across the chart's 2025-to-2026 gap as coverage, not growth.

"The free tier cut did exactly what you'd expect: it pushed out the accounts that were never going to pay. What it didn't do is start a decline. A year later SendGrid is the third most detected email platform on the web, and it is flat month to month rather than bleeding." - Mehmet Suleyman, CEO at TechnologyChecker.io

Sales Signal: 4,202 domains have dropped SendGrid since we began tracking it in March 2026. Those are your warmest leads. They recently made an active decision to move and may still be evaluating alternatives.

Customer Profile

49.8% of SendGrid customers have 1-10 employees, and 77.8% have fewer than 50. This is a developer tool that small teams grab because the API is clean. The age distribution confirms it: 34.8% were founded in the 2010s and 19.7% in the 2000s.

The enterprise tail is small but prestigious. 38 of the 50 largest companies on our list have 10,001+ employees, including Starbucks, Tesla, Carrefour, and Johnson Controls. Twilio's case studies highlight Glassdoor (99.5% delivery rate) and Shopify (1.7M+ merchants, 99.5% delivery), both of which we still detect. The detection URLs tell the real story: the University of California's sits on uceap.universityofcalifornia.edu, Carrefour's on communaute.carrefour.fr. These are departmental deployments, not company-wide email infrastructure.

Sales Signal: The typical buyer is a developer at a 1-50 person company building transactional email into a SaaS product. For enterprise targets, pitch consolidation: they're running SendGrid on one subdomain and a competitor elsewhere.

Industry and Geographic Concentration

Real Estate leads at 5.54%, followed by Software Development (4.33%) and IT Services (4.01%). No industry exceeds 6%, making SendGrid one of the most horizontal platforms we track. Tech-adjacent verticals combine for 11.17%. The US leads at 34.4% with Germany second at 12.0% and Brazil third at 9.4%. English-speaking markets account for roughly 51%, which leaves almost half the install base in markets a US-centric sales motion never touches.

Sales Signal: Germany and Brazil together represent over 21% of the customer base, giving you 47,759 potential prospects for localization and compliance services (GDPR, LGPD).

Migration Patterns

Migration here counts domains we watched switch since March 2026, so the numbers are small by design and current by construction. 197 domains left SendGrid for Amazon SES while 95 came the other direction, a net loss of -102. That's SendGrid's only losing corridor of the five. Against Mailgun the picture reverses: 187 gained vs 119 lost, net +68. The biggest single inflow is from MailChimp at 530 gained vs 90 lost, net +440.

The Amazon SES losses make sense. SES charges $0.10 per 1,000 emails with no monthly minimum. SendGrid Essentials starts at $19.95/month. The free tier removal in July 2025 likely started this flow, and it is still running.

"The SES corridor is the one to watch. Every company already on AWS is one API call away from it, at zero switching cost inside an ecosystem they already pay for. It is the only direction where SendGrid loses more than it takes." - Mehmet Suleyman, CEO at TechnologyChecker.io

Sales Signal: SES-bound companies prioritize cost. MailChimp-to-SendGrid migrants prioritize deliverability and API control. Offer migration consulting for the SES-bound and deliverability audits for the MailChimp refugees. (For more on why SaaS companies switch platforms, see Why 73% of SaaS Companies Switch CRMs Within 3 Years.)

Technology Ecosystem

Google Analytics at 55.77% confirms SendGrid's data-driven customer base. On the CMS side WordPress leads at 30.48% with Jimdo at 25.04%, the latter mapping to the large German user base. HubSpot leads marketing automation at 6.06%, with RD Station at 3.41% reflecting the Brazilian share, indicating many users run separate tools for transactional and campaign email.

Sales Signal: The low marketing automation overlap (HubSpot at just 6.06%) means the overwhelming majority of SendGrid users don't have a marketing automation tool. That's either a massive gap or proof they're purely transactional senders.

G2 Review Signals

G2 reviewers praise SendGrid's ease of use (4 mentions) and API quality (3 mentions), which tracks with our data showing half of users are teams of ten or fewer. The top pain points are poor customer support and automatic account suspensions. SendGrid freezes accounts for unusual sending patterns, and reviewers say the appeals process is slow. Cross-reference that with migration data: the SES corridor is SendGrid's only net loss, and SES doesn't do automated suspensions. For a company whose transactional email died for hours from a false positive, switching makes total sense.

Sales Signal: The suspension pain point creates an opening for deliverability monitoring tools. Target SendGrid users who've experienced freezes. They want early warning before automated systems cut their email.

Key Takeaways

1. SendGrid is the third most detected email platform on the web at 328,176 active domains and 13.23% share, flat month over month rather than declining.

2. Half the base is micro-businesses, but the enterprise tail includes Starbucks, Tesla, and Carrefour in departmental deployments.

3. Amazon SES is the only losing corridor (net -102 since March 2026). Cost, not features, drives the flow.

4. Genuinely horizontal: no industry exceeds 6%. Germany and Brazil account for over 21% of users.

Sales Applications

Outreach template: "Hi [Name], I noticed [Company] runs SendGrid alongside [Google Analytics/no marketing automation]. Half of SendGrid users are teams of 10 or fewer running transactional email without a campaign tool. Are you hitting delivery targets, or dealing with sending pattern alerts?"

Targeting strategy: Filter by company size (1-50 employees), industry (Software Development or Real Estate), geography (US, Germany, or Brazil), and tech stack (no marketing automation). This narrows to developer-led teams that haven't invested in a full email suite.

Competitive angle: Lead with total cost of ownership. SendGrid Essentials is $19.95/month. Amazon SES is $0.10/1,000. Mailgun flex is $0.80/1,000. Frame around deliverability and support quality beyond raw per-email price.

Explore the full SendGrid install base at TechnologyChecker.io. Our dataset covers 328,176 active domains with 227,767 enriched companies including industry, size, location, and tech stack data.