What Our Customers Say
Real feedback from founders, engineers, and operators who use Keplars to power their transactional and marketing email infrastructure.
Loved by Product Teams Worldwide
From early-stage startups to scaling engineering teams. Real companies, real results.
"Keplars made email much easier for us. We've used other email tools before, and there's usually some friction - setup, deliverability, or configuration. With Keplars, things felt much more straightforward. We got started quickly, and emails have been consistently reliable. Deliverability has been strong, and the platform is built with strong security, so we're comfortable using it for critical user communication. The developer experience is smooth, and the email editor makes it easy to build and iterate without switching tools. Overall, it fits naturally into our product workflow."
Hamza Zia
Founder & CEO at Gitstart
"We tried a few email tools before this, and honestly, the biggest difference for us was how simple everything felt. You don't need to spend hours figuring things out. The APIs are clear, and the email editor is one of the easiest we've used. It's powerful, but not overwhelming."
Edward So
Cofounder and CEO @ Roostoo Labs
"Keplars runs our internal transactional emails and powers email sending for FoundersBoxx users directly from their own accounts. Two very different use cases, one clean integration. Had it all wired up in minutes."
Filiberto Secchi
Founder & CEO at FoundersBoxx
"With Keplars, we can clearly see delivery, opens, and clicks without digging through logs or multiple tools. It's straightforward, fast to set up, and just feels more predictable and easier to work with."
Damien Mahuzier
Head of Sales at Gitstart
"Keplars is a seamless integration of work emails into our SuperheroSoftware Stack. It is very effective and we look forward to working with them for a long time."
Tim Coleman
Co-Founder of O'Ryan Health
"Integrating with Keplars has been way easier than I thought - everything is super smooth and responsive. As Head of Engineering at TouchStack we have migrated from Resend to Keplars which is way cheaper and flexible to configure email setups for our clients."
Kobby Isreal
CTO at TouchStack
"Keplars has now been our go-to email service provider. It is extremely easy to integrate with and steps for configuration are pretty much simple to go through. Our roll out of Keplars has been fast and efficient and we are getting the value from using Keplars. I strongly recommend Keplars for startup founders who are starting a new project or even scaling existing projects."
Brian Adjei-Otchwemah
Senior Client Success Manager
All Reviews
Every review, unfiltered.
"I've tried several email APIs, but Keplars.com stands out with its simplicity and speed. Perfect for high-volume transactional emails without the hassle. Top-notch service!"
Anchit Das
Co-Founder & CTO @ Stealth AI Startup
"Very cool! Thanks for the video that was well made and helpful."
Jonathan Goldsmith
iOS Developer
"I really love how you've removed the pain point for developer when configuring a mail service like resend, where I always need to have a domain registered already that I can map to the service."
Sola Maxwell Lana
Full-stack Developer
"Have been using other service in the past, I guess a simple REST bases system is much better. I like the product."
Priyanshu Verma
Co-Founder & Tech @KaizenLabs
"Keplars made setting up email for our startup product straightforward and fast. From a backend perspective, the API was clear and developer-friendly, and we had everything running within minutes."
Oluwatobi Makinde
Lead Software Developer
"I really like what you’ve built, the user experience is very intuitive. The setup process was smooth and straightforward."
Collins Ndubisi
Product Designer & Game Developer
"I switched from EmailJS to Keplars to focus on code rather than configurations. The instant open and delivery rate tracking gives me total confidence, plus the AI templates save me hours of design work. It is the best choice for developers who value efficiency over complex setups."
Joseph Jonah
Full-Stack Developer
"Lightning-fast support and continuous improvements. Excellent service."
James Brown
DevOps Engineer
"Seamless workflow integration that saved us countless hours."
Lisa Anderson
Full Stack Developer
"Professional, reliable, and feature-rich. Everything we needed in one place."
Christopher Lee
Tech Lead
"Got it set up and sent my first email in under 10 minutes, really smooth experience for a beginner like me. The setup was straightforward and the node works cleanly inside n8n workflows."
Kingsley Mark
AI Automation Specialist
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Set up in under 5 minutes. No SMTP configuration. No deliverability headaches.
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