
Brevo
Litmus
Email on Acid
AWeber
MailerLite
250ok
Mailtrap
Email HTML testing tools for web developers

Mailgun
SendGrid Email API
Postmark
Amazon SES
Mailjet
Sparkpost
Brevo
Security-first transactional email: SMTP relay and REST API for password resets, receipts, 2FA and notifications. 100% owned infrastructure, strict sender vetting, human deliverability, ISO 27001/27701/HIPAA, native SendGrid/Mailgun compatibility.

Which is more popular?
Based on our record, Testi@ seems to be more popular. It has been mentioned 3 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | testi.at | omnivery.com |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from the Czech Republic · 1 - 9 employees · 2022 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Testi@ yet.
Omnivery is a security-first transactional email platform for teams whose password resets, 2FA codes, receipts, and confirmations have to arrive — in the inbox, on time. It provides both an SMTP relay and a REST API natively compatible with the SendGrid v3, Mailgun v3, and SparkPost v1 schemas,...
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of Testi@ yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
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Jakub Olexa, Founder and CEO of Mailkit and Omnivery, discusses Non-Human Interactions (NHI) in e...
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Testi@ and Omnivery.
Omnivery's answer:
Omnivery's answer:
Omnivery closes the gaps the major providers leave. Against SendGrid, Mailgun, and Amazon SES you get 100% owned infrastructure (no third-party cloud), the ISO 27001 / 27701 / HIPAA trio, native bot detection, and deliverability run by senior human analysts rather than automated alerts — a combination none of them offer together. Migration is low-risk: the REST API is natively compatible with SendGrid v3, Mailgun v3, and SparkPost v1, so most integrations move with a credential swap, and one-click migration carries over suppression lists, bounces, and unsubscribes. Kiwi switched in 45 minutes and saw a 17% click-rate improvement. And with data residency available in both the EU and US, teams with regional compliance requirements are covered either way.
Omnivery's answer:
Omnivery runs entirely on its own infrastructure — no third-party cloud provider — built security-first with support for multiple geographic data-storage regions. Sending is delivered through a high-performance mail transfer agent exposed as both an SMTP relay and a REST API that is natively compatible with the SendGrid v3, Mailgun v3, and SparkPost v1 schemas, with real-time webhooks for delivery events. The Bot Detection API is powered by 20+ proprietary datasets built over 8+ years, combining IP reputation, user-agent analysis, behavioural pattern matching, and honeypot data.
Omnivery's answer:
Omnivery grew out of Mailkit, an email platform founded in the Czech Republic in 2006 that became known for deliverability — "the ones who know how to deliver." Over the years, customers kept asking to use that sending infrastructure directly as an SMTP and API service. Founder and CEO Jakub Olexa saw that most sending services shared the same weakness — loose abuse controls and weak privacy enforcement dragging down everyone's reputation and deliverability — so Omnivery was built on the opposite principle: strict sender vetting, no free plans, owned infrastructure, and compliance first. The company was founded in 2021 and the platform launched in May 2022, carrying 18+ years of deliverability heritage.
Omnivery's answer:
Omnivery is a transactional email platform that runs on 100% owned infrastructure — no third-party cloud — and admits only vetted senders, so every customer sends from a clean IP neighbourhood rather than a shared pool full of unknown accounts. Three things set it apart from SendGrid, Mailgun, and Amazon SES: it is certified to ISO 27001, ISO 27701, and HIPAA together (a combination no other major transactional provider holds), it never stores message content, and it includes a Bot Detection API that flags security-scanner clicks, Apple MPP opens, and botnet fraud. Deliverability is handled by senior human analysts who reach out before problems become incidents — not by automated alerts.
Omnivery's answer:
Omnivery is built for teams that treat email as mission-critical infrastructure and can't afford a password reset, 2FA code, receipt, or booking confirmation to arrive late or land in spam. In practice that means SaaS and product teams, e-commerce and marketplaces, travel and booking platforms, and regulated industries — financial services, insurance, and healthcare (Omnivery is HIPAA-certified, with BAAs available). It's a particularly strong fit for regulated and privacy-sensitive teams that need compliance enforced at the infrastructure level — with data residency available in the EU or US — and for utilities, banks, and public-sector bodies running legacy systems that can send via SMTP but can't be rebuilt around a REST API.
Share your experience with using Testi@ and Omnivery. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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As an email marketing agency we've been using Omnivery for our clients for several years now and their proactive support never case to amaze us. We're sending through Omnivery apprx. 250 mio. emails / year. Excellent...
I've been using Omnivery for a little over a year now, and the platform has continued to evolve in ways that have helped take our email program to the next level. One of the biggest differentiators is its ability to...
Recommendations tracked on public social media and blogs since March 2021.


My company, a small startup, asked me to create an email signature that can be customized and used by everyone on the team. They requested design that included a circular image of the sender, some styled text, and social media links. I... Source: over 3 years ago
For peace of mind — Learn the peculiarities of HTML mails (Think 1995 HTML & Inline CSS mixed with shitty client quirks) and roll your own engine, then test with something like https://testi.at. - Source: Hacker News / over 4 years ago
You can test out the html using something like PutsMail or Testi@. If you like the result, rename it the file to IntegrationTests/Snapshots/Welcome.expected.html. - Source: dev.to / almost 5 years ago
Tracking Omnivery since Jul 2026.
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