Email on Acid vs Klaviyo

Mailchimp

Omnisend

Datadog

Drip

Litmus

charles

Compare Email on Acid and Klaviyo based on features, pricing, verified reviews, integrations & more on GetApp. Find out which software is best for your business in 2026.

Litmus helps agencies, designers and marketers to build, test, preview and track their emails for optimal email campaign effectiveness

charles assists companies in pioneering conversational commerce by integrating shop systems, chat apps, and bots in a single platform. Key features include lead distribution & qualification, analytics, human handover, one-to-one messaging, real-time conversations, multi-chat, automation, and more.

Datadog is a monitoring and security platform for Dev, Sec, and Ops teams that unifies metrics, traces, and logs in one place so teams can get full visibility into their IT environment.

Campaign Precheck is our guided seamless checklist that optimizes every email, from your preview text to visually-accessible design, deliverability checks and email previews, allowing you to save time, reach more subscribers and achieve higher ROI with every message.

Campaign Management

CAN-SPAM Compliance

Click Tracking

Email Campaign Management

Email Templates

Email Tracking

Geolocation

Image Library

Location Tracking

Mobile Optimization

Real-Time Analytics

Reporting/Analytics

Spam Blocker

Template Management

WYSIWYG Editor

Email on Acid

Web-based

Growth Manager

Email on acid does actually make it easier, and certainly lends good confidence to the work you're putting out. There is a huge variety of clients it will emulate and it's super simple to use.

Marketing Specialist

It's an unnerving feeling to send an email out to thousands of people, and email on acid helps put your mind at ease knowing your emails look great in any viewing platform.

Frontend Developer/Designer

But I do sometimes get frustrated that certain screenshots take forever, and sometimes they render badly. Small price to pay for a product that's actually in my budget as a freelancer.

marketing automation specialist

My experience has been really great from a product capabilities, support and reliability standpoint.

Multimedia Designer

I use this software A LOT. It is very intuitive to use and it is helpful in ensuring your emails look great.

Its a very good tool for helping to prepare and navigate through the email testing and deploying process.

eCommerce Email Marketing Manager

When using templates over and over and changing the code, errors can happen and I fully trust Email on Acid to tell me if my email if my email is broken or not rendering properly.

I dislike that this software allows you to see your ememo across multiple clients because then project managers get caught up in details in obscure email clients.

What I love about Email on Acid is how quickly I can see how my email renders across all email providers as well as internet browsers.

Marketing and PR Manager

No real cons, you even get a trial to evaluate the service before beginning to pay.

Email on Acid screenshot: Test your email until it’s perfect. We offer unlimited testing across 70+ clients and devices, so you know how your email will look before it hits the inbox.

Email on Acid screenshot: Protect your brand’s reputation. Check spelling on every part of your email, including the title, preheader, alt text and body copy. Campaign Precheck will find errors before your subscribers do.

Email on Acid screenshot: Email testing, simplified. Send a test email directly from your email service provider or upload your HTML to our system. We’ll help you spot funky formatting, broken links and code problems.

Email on Acid screenshot: Email on Acid lets you preview your email design across the most popular clients and devices, so you know how your email will look before it hits the inbox.

Email on Acid screenshot: Preview emails on mobile, desktop and tablet. See what your email looks like on more than 70 clients and devices. View the emails in portrait or landscape so you know how your email will look for every subscriber.

Email on Acid screenshot: Save time and drive revenue by testing your email before you hit send.

Email on Acid screenshot: Ensure your message is loud and clear. Image validation makes sure your images render properly on every email client and device, so you can reach more subscribers on more platforms.

Email on Acid screenshot: Don’t lose out on your CTA. URL validation checks every link in your email, so you can avoid broken URLs and lost CTAs. You’ll be able to verify landing pages and redirects without leaving the app.

Email on Acid screenshot: Connect with more subscribers. Campaign Precheck’s accessibility tool lets you optimize your code for screen readers and visually impaired subscribers.

Email on Acid screenshot: Improve team collaboration. Whether you’re an email marketer or a developer, our tools can help your team streamline the email testing process.

Email on Acid screenshot: Test and edit instantly. Simply load up your email and tweak the code in our editor – you’ll see the preview change as you adjust the code. Need to run a new email test? Just hit the “retest” button in the editor and see your new email render in seconds.

Email on Acid screenshot: Email QA workflow

Email on Acid screenshot

Freelancers

Large Enterprises

Mid Size Business

Non Profit

Public Administrations

Small Business

Mailchimp is a marketing automation platform that allows users to create, send & analyze email & ad campaigns, with email templates, landing pages, and a mobile app

Omnisend is an email marketing software designed specifically for ecommerce businesses. It combines email, SMS, and web push notifications in a single platform with pre-built automations for cart abandonment, welcome series, and post-purchase campaigns. The platform features advanced segmentation capabilities that update in real time based on customer behavior and integrates with multiple eCommerce tools.

Meet Drip: the world’s first direct-to-people platform that enables community-driven brands to take direct control of each stage of their customer’s journey. From collecting a new visitor’s email to rewarding repeat buyers, Drip helps brand-focused marketers automate their growth stress-free.

Klaviyo is the all-in-one platform built to help B2C companies grow by integrating email/ SMS marketing, full-funnel analytics, and service in one solution. Powered by customer data and built-in AI, Klaviyo makes it easy to scale marketing automation and personalization across all your channels.

2-Way Messaging

A/B Testing

Activity Dashboard

Alerts/Notifications

Audience Targeting

Automated Responses

Autoresponders

Behavior Tracking

Behavioral Analytics

Campaign Analytics

Campaign Planning

Campaign Scheduling

Campaign Segmentation

Channel Management

Contact Database

Contact Management

Conversion Tracking

Customer Database

Customer Profiles

Customer Segmentation

Customizable Branding

Customizable CTAs

Customizable Fields

Customizable Forms

Customizable Templates

Data Import/Export

Data Integration

Drag & Drop

Drip Campaigns

Dynamic Content

Email Management

Email Marketing

Engagement Tracking

Event Triggered Actions

GDPR Compliance

Generative AI

Interaction Tracking

Landing Pages/Web Forms

Lead Capture

Lead Generation

Lead Management

List Management

Marketing Automation

Marketing Calendar

Mass Texting

Message Personalization

Mobile Coupons

Monitoring

Multi-Campaign

Multi-Channel Communication

Multi-Channel Marketing

Multiple Data Sources

Multivariate Testing

Personalization

Predictive Modeling

Preview Functionality

Real-Time Data

Real-Time Monitoring

Real-Time Reporting

Reporting & Statistics

ROI Tracking

Sales Analytics

Scheduled Messaging

Segmentation

Shortcodes

SMS Marketing

SMS Messaging

Social Marketing

Social Media Integration

Third-Party Integrations

Web Forms

Website Visitor Tracking

Klaviyo

Program Faciliator

The analytics are great, too. I also love that they automatically place subscribers in sub categories like potential sales or engaged subscribers.

Director of Ecommerce

We felt confident in their ability to successfully transition ESP platforms. The product itself is quite good and does everything you would expect it to.

Marketing Director

Klaviyo makes it super easy to segment customers based on any number of attributes. This has been such a great feature that I can really get granular about my audience.

Manager

The other huge plus is their amazing customer service. They are on their toes waiting to help you.

Overall we like Klaviyo. We've had a good experience with them and the customer service is always helpful.

M satisfied because the revenue generated with email marketing via klaviyo is really good and I definitely recommend it for every e-commerce store.

There's very little I dislike about this software. My only complaint is small - when creating a new sequence, you can't change the "trigger" that initiates the flow.

Owner

I like Klaviyo's flows the best. It's easy to learn how to trigger action-based flows from activities on your e-commerce site.

Growth marketer

Klaviyo offers the best email marketing analytics I have seen so far. The feature online best is the live analytics.

I integrated Klaviyo with my Shopify store with such ease. I love having everything all in one place and being able to schedule emails weeks even months in advance.

CRO Specialist

The administrator is super easy to use, its UX is dummy-proof and covers all the basics of email marketing.

My overall experience is very good with integration and implementation.

VP of Innovation

This is just a really disingenuous way to price as you get charged for that user every month even if you dont email a list member.

I will continue to recommend Klaviyo to this whose budget account for it and who want full email marketing capabilities in one nicely packaged app.

Quite good, It is very simple to use so anybody with limited email marketing knowledge can use. Would recommend it for small mid-size companies.

Digital Marketing and E-Commerce Intern

I would highly recommend  Klaviyo to anyone who is working in E-Commerce - I cannot get over how easy to use the platform is.

It was difficult to understand at first. You would have to read a lot of documentation before you can understand basic features.

Graphic Designer

Not everything is customizable. While fonts can be imported, they don't always show up on email browsers so you're limited by Klaviyo's native fonts.

Email on Acid vs Klaviyo Comparison (2026)

Email on Acid

Klaviyo

Overview

Video & Screenshots

Pricing

User reviews

Key features

Integrations

Alternatives