Email on Acid vs Litmus

by Gralio Mar 10, 2025

Email on Acid and Litmus both offer email testing solutions, but they cater to different needs and budgets. Email on Acid prioritizes affordability and ease of use for pre-send email testing, while Litmus offers a more comprehensive platform for larger businesses with advanced email marketing requirements.

At Gralio.ai we help to simplify your decision-making process by offering detailed, side-by-side software comparisons like this one, to help you confidently choose the tool that aligns with your business goals.

This comparison was created by analysing 478 reviews and 60 websites, saving 3 hours, 9 minutes of reading.

Email on Acid

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Litmus

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About

Email on Acid is now part of Sinch, a company offering a range of communication tools including messaging, email, and voice solutions. Sinch provides businesses with various APIs and applications for marketing, customer support, and operational needs. Their services help businesses connect with customers through email and mobile channels.

Litmus is an email marketing platform designed for medium to large businesses. It helps you create, test, and analyze email campaigns. With Litmus, you can ensure your emails display correctly across different email providers and devices. It also provides tools to personalize emails and track their performance, ultimately improving your email marketing results.

Summary

Main difference

Email on Acid is a cost-effective email testing platform ideal for businesses primarily focused on pre-send email rendering and accessibility checks across various clients and devices. Litmus offers broader email marketing capabilities, including A/B testing, advanced analytics, and campaign management tools, making it better suited for larger businesses with more complex email marketing needs.

Relative strengths of Email on Acid (compared to Litmus)

More affordable pricing, especially for unlimited email previews.
User-friendly interface for straightforward email testing.
Wide range of email client and device previews, including dark mode support.

Relative weaknesses of Email on Acid (compared to Litmus)

Limited A/B testing capabilities compared to Litmus.
Less comprehensive analytics and reporting features.
Fewer integrations with other marketing platforms.

What companies are using Email on Acid and Litmus?

Who should use Email on Acid VS. Litmus

Email on Acid, now part of Sinch, helps businesses connect with customers through various channels. Users praise its affordability, unlimited testing, and user-friendly interface. However, some have noted occasional rendering inaccuracies and UI slowdowns. A strong option for businesses seeking an affordable email solution.

Litmus is an email marketing platform ideal for medium to large businesses seeking to optimize their email campaigns. Users praise Litmus's email previews and spam testing capabilities, especially the Email Guardian feature. However, some find the analytics dashboard unintuitive and the pricing high. With features like A/B testing and deliverability testing, Litmus helps ensure your emails reach the right audience and render correctly across various devices and email clients.

Best fit for medium to large businesses (101+ employees) seeking enhanced communication solutions.
Ideal for Retail, Healthcare, Software/IT, and Marketing, aligning with Email on Acid's strengths.

Best for medium to large businesses (101+ employees).
Suitable for various industries, including Healthcare, Finance, Retail, Manufacturing, Education, and more.

Email on Acid and Litmus features

Supported

Partially supported

Not supported

Type in the name of the feature or in your own words tell us what you need

Campaign Precheck

Supported

Email on Acid automatically checks for accessibility, deliverability, and rendering issues.

Supported

Litmus supports pre-send checks for accessibility, deliverability, and rendering.
Unlimited Email Previews

Supported

Email on Acid offers unlimited previews on over 100 email clients and devices, including dark mode.

Not supported

Litmus offers email previews on many email clients and devices, but not unlimited.
Email Accessibility Check

Supported

Email on Acid supports email accessibility checks, including pre-checks for compliance.

Supported

Litmus supports email accessibility checks, including tools for visual impairments and screen readers.
A/B testing

Partially supported

Email on Acid might support A/B testing, but it is not explicitly stated.

Partially supported

Litmus supports A/B testing via integration with email service providers.
Deliverability testing

Supported

Email on Acid supports sending test emails to check deliverability.

Supported

Litmus supports deliverability testing with pre-send checks and spam filter testing.
Spam filter testing

Supported

Email on Acid allows users to test their emails against spam filters.

Supported

Litmus offers spam filter testing against 20+ filters, including Gmail and Outlook.

Qualities

Value and Pricing Transparency

No data

+1

Strongly positive sentiment
Customer Service

No data

No data
Ease of Use

No data

+1

Strongly positive sentiment
Reliability and Performance

No data

+0.54

Rather positive sentiment
Ease of Implementation

No data

+1

Strongly positive sentiment
Scalability

No data

No data

Email on Acid and Litmus Pricing

Sinch offers pay-as-you-go pricing for their SMS services including one-way sending and numbers. They offer SMS enabled numbers with a setup fee and a monthly fee. There are additional fees for 10DLC, toll free numbers, and short code.

Plans

See full Pricing page

Litmus offers email marketing solutions with three plans: Litmus Basic for individuals, Litmus Plus for small teams, and a custom Enterprise plan for larger organizations. They also offer a Litmus Personalize Pro add-on with custom pricing. All plans include features like email previews, automated QA, a design library, and integrations. They offer a 7-day free trial for the Basic and Plus plans. Annual billing offers a lower monthly cost.

Plans

User sentiment

Strongly positive

See full Pricing page

Email on Acid and Litmus review insights

475 reviews analysed from and

Users love

Affordable and offers unlimited testing, making it a cost-effective solution.
User-friendly interface with a straightforward testing process.
Fast email rendering previews across a wide range of email clients and devices.
Helpful HTML code analysis tool that identifies errors and provides suggestions.
Useful spam testing features to improve email deliverability.

Email previews are a game changer, providing various renders across email clients and devices.
Email Guardian provides security by alerting users of client or mobile updates.
Facilitates an efficient review process, particularly for QA and spam testing.
Helpful resources and tooltips improve user confidence and knowledge in email marketing.
AI features, like subject line copy testing, are very beneficial.

Users dislike

Occasional inaccurate email rendering, particularly on iOS devices.
Some users report delays in preview generation, especially after HTML updates.
The user interface can be clunky and slow at times.
Limited customization options within the Design Editor.
Some users find the analytics reporting and aggregation tools to be limited.

Limited templates available for email creation.
The Analytics tab can be unintuitive and difficult to fully utilize.
Previews can sometimes be inaccurate.
Limited customization options.
High cost, especially for integrations and additional features.

Email on Acid and Litmus Ratings

G2

4.5/5

(42)
Capterra

4.4/5

(26)
Glassdoor

3.6/5

(366)

G2

4.6/5

(407)
TrustPilot

3.1/5

(3)
Glassdoor

3.8/5

(64)

Company health

Employee growth

1% decrease in the last year

No change in the last year

Web traffic

22% decrease in the last quarter

9% decrease in the last quarter

Financing

May 2024 - $2B

June 2015 - $49M

How do Litmus and Email on Acid compare in email preview accuracy across iOS devices?

Email on Acid users report occasional inaccuracies with email rendering on iOS devices, while Litmus users also mention occasional preview inaccuracies, but without specific reference to iOS. Therefore, it's difficult to definitively say which performs better for iOS preview accuracy based on these user reviews.

Which product offers better integration with existing marketing automation platforms?

Litmus is the better choice for integration with existing marketing automation platforms. While neither product description explicitly details specific integrations, Litmus's target audience of medium to large businesses and higher price point suggest it likely offers more robust integration capabilities compared to Email on Acid, which focuses on email previews and testing. Furthermore, user reviews for Litmus, while mentioning high costs, do not complain about a lack of integrations.

What are the advantages of Email on Acid?

Email on Acid offers unlimited email previews across a wide range of email clients and devices, including dark mode, at a more affordable price point than Litmus. Users praise Email on Acid's user-friendly interface and fast rendering previews. It also provides helpful HTML code analysis and spam testing features to improve deliverability.

What are the disadvantages of Email on Acid?

Email on Acid users have reported occasional inaccuracies in email rendering, especially on iOS devices. Some also experience delays in preview generation after HTML updates. The user interface has been described as clunky and slow, with limited customization options in the Design Editor. Finally, the analytics reporting and aggregation tools are considered limited by some users.

Is Email on Acid cheaper than Litmus?

No, Email on Acid's pricing is not available for direct comparison. While Litmus's pricing starts at $79/month, Email on Acid's current pricing information within the Sinch platform is not provided for their email testing services. Therefore, a definitive price comparison cannot be made.

Alternatives to Email on Acid and Litmus

Mailchimp All-in-One Marketing Platform

Mailchimp is a popular marketing platform designed to help growing businesses of all sizes. It enables you to create, send, and analyze email and advertising campaigns. With features like pre-designed templates, landing page creation, marketing automation, and data analytics, it provides a comprehensive toolkit to manage your marketing efforts. Mailchimp emphasizes data-driven insights to optimize campaigns and aims to drive sales through personalized customer interactions across multiple channels, including email, social media, and text messages.

Constant Contact

Constant Contact is a digital marketing platform designed to help small and midsize businesses grow. It offers tools to build email lists, create and send marketing emails, manage social media, and track results. Constant Contact aims to simplify digital marketing with easy-to-use features and integrations with popular business tools. It stands out with its focus on small businesses, providing affordable plans and award-winning customer support.

Klaviyo

Klaviyo is a marketing automation platform designed for businesses of all sizes. It helps you create personalized marketing campaigns across email, SMS, and other channels. Klaviyo offers tools for email and SMS marketing, automation, segmentation, and data analysis. It stands out with its customer data platform, which provides a centralized view of customer information, enabling highly targeted campaigns. Klaviyo promises to help you increase conversions and customer lifetime value.

Campaign Monitor by Marigold

Campaign Monitor by Marigold is an email marketing platform designed for businesses of all sizes. It offers a user-friendly drag-and-drop interface to build and send personalized email campaigns, create automated email sequences, and track performance. Campaign Monitor provides pre-designed templates, customizable forms, and features like A/B testing to improve email engagement. Its focus on simplicity and visual tools makes it easy for marketers to create professional email campaigns without needing technical expertise.

ActiveCampaign

ActiveCampaign is a marketing automation platform designed for businesses of all sizes. It helps you create personalized customer journeys across various channels like email, SMS, and ads. You can automate repetitive tasks, track customer behavior, and improve your marketing campaigns with its CRM and sales automation features. ActiveCampaign integrates with over 900 popular business tools and offers a wide range of pre-built templates and automation recipes to streamline your marketing efforts.

Zoho Desk

Zoho Desk is a cloud-based customer service software designed to help businesses of all sizes manage customer interactions. It offers a suite of tools including phone, email, live chat, SMS text, and social media management, all within a single platform. Zoho Desk focuses on providing a comprehensive yet affordable solution, allowing businesses to streamline their customer service operations and improve customer satisfaction without breaking the bank.

Page co-authored by

Michal Kaczor

CEO at Gralio

Michal has worked at startups for many years and writes about topics relating to software selection and IT management. As a former consultant for Bain, a business advisory company, he also knows how to understand needs of any business and find solutions to its problems.

Tymon Terlikiewicz

CTO at Gralio

Tymon is a seasoned CTO who loves finding the perfect tools for any task. He recently headed up the tech department at Batmaid, a well-known Swiss company, where he managed about 60 software purchases, including CX, HR, Payroll, Marketing automation and various developer tools.

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