High-volume, low-cost cloud email service from AWS used for transactional (and marketing) sends with API and SMTP interfaces.
Rank HistoryAVG#1.5
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.65.7
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.9.5%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.61%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#1.5
Widely used transactional + marketing email platform with robust APIs, templates, and deliverability tooling.
Rank HistoryAVG#1.5
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.68.0
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.9.0%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.64%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#1.5
Developer-focused email API and SMTP relay optimized for transactional messages, parsing, and deliverability.
Rank HistoryAVG#3.2
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.69.7
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.8.6%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.64%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#3.2
Email delivery platform and API used for transactional and high-volume sending with analytics and deliverability features.
Rank HistoryAVG#5.1
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.63.5
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.8.1%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.37%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#5.1
Provider focused specifically on transactional email — known for fast delivery and strong deliverability practices for product emails.
Rank HistoryAVG#4
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.64.5
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.7.6%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.64%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#4
Newer developer-centric transactional email API with simple DX (SDKs, webhooks) and growing popularity for product emails.
Rank HistoryAVG#6.2
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.65.7
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.7.1%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.52%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#6.2
All‑in‑one marketing platform that also provides a transactional email API/SMTP (rebranded from Sendinblue to Brevo).
Rank HistoryAVG#8.2
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.62.1
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.6.7%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.81%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#8.2
Transactional email API and SMTP relay aimed at developers and product teams; part of the Mailer family of products.
Rank HistoryAVG#7.7
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.72.8
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.6.2%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.100%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#7.7
Mailchimp’s transactional email offering (formerly Mandrill) available as an add‑on to Mailchimp accounts for API/SMTP transactional sends.
Rank HistoryAVG#8.3
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.54.4
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.5.7%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.60%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#8.3
Affordable email delivery platform offering transactional API and SMTP relay for developers and businesses.
Rank HistoryAVG#10.9
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.66.2
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.5.2%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.100%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#10.9
Marketing automation platform that also supports API-triggered transactional emails and flows for e-commerce and product events.
Rank HistoryAVG#17.2
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.51.5
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.4.8%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.59%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#17.2
Customer engagement platform that includes a transactional API for triggered, personalized app emails and fine‑grained messaging control.
Rank HistoryAVG#16.8
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.25.9
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.4.3%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.56%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#16.8
SMTP relay and transactional email provider focused on reliable delivery, straightforward setup and logging.
Rank HistoryAVG#14.9
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.54.9
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.3.8%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.100%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#14.9
Developer API and SMTP relay (Pepipost now integrated into Netcore) focused on fast transactional delivery, analytics and inbox placement optimization.
Rank HistoryAVG#14
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.37.5
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.3.3%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.9%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#14
SMTP relay and email API provider that supports separation of transactional and marketing streams, with deliverability services.
Rank HistoryAVG#14.1
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.58.3
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.2.9%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.100%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#14.1
Longstanding SMTP relay and transactional email delivery provider used by enterprises and smaller senders.
Rank HistoryAVG#15.6
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.56.8
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.2.4%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.100%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#15.6
Transactional + marketing email platform with API and SMTP relay aimed at teams that want both campaign and transactional capabilities.
Rank HistoryAVG#12.7
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.44.2
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.1.9%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.40%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#12.7
Originally an email sandbox for development and testing; also offers production delivery/relay and deliverability monitoring for transactional sends.
Rank HistoryAVG#12.5
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.57.2
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.1.4%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.65%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#12.5
Growth/engagement platform that can send both marketing and transactional messages via API — used by teams that want unified customer messaging.
Rank HistoryAVG#18.2
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.36.0
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.1.0%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.36%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#18.2
Multichannel platform (email, SMS, push) offering SMTP/API transactional email, templates and tracking suitable for SMBs and apps.
Rank HistoryAVG#17.9
Serplock RatingSerplock Rating is our score for how visible a brand is in ChatGPT for this category. Higher is better. The highest scores belong to brands ChatGPT recommends most often here.35.1
Share of VoiceShare of Voice is a brand's share of recommendations compared to other brands in this category. Higher is better. A leading share means ChatGPT points users to that brand more than competitors.0.5%
ConsistencyConsistency is how often ChatGPT includes a brand in this category from week to week. Higher is better. Reliable presence means steady visibility in AI answers.56%
Average AI RankAverage AI Rank is the typical position ChatGPT gives a brand in this category over time. Lower is better. Brands users hear about most often rank closer to #1.#17.9
