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What is Mosaico?

Crafting an email that displays well on various devices and clients can be quite challenging, even for experienced experts. Mosaico makes this task easier, allowing you to create an eye-catching and functional template without requiring a specialized team or extensive testing. It seamlessly works with all prominent email clients and devices, providing options for graphic customization of the overall theme as well as specific style tweaks for each component. You can eliminate the frustration of continuous saves, reviews, and approvals; thanks to an intuitive template language, you can have your HTML design operational on Mosaico within just a few hours, including automatic adjustments for different screen sizes. Released under the GPL license, Mosaico's complete codebase is available on GitHub, encouraging developers, template creators, end-users, and UI/UX designers to provide their feedback and suggestions (though support requests are not accepted) by reaching out at feedback at mosaico.io! With Mosaico, not only can you simplify your email design process, but you can also greatly boost your overall productivity. So go ahead and take advantage of this innovative tool to elevate your email marketing efforts.

What is Coldletter?

Coldletter is a product email platform that combines visual email design, template management, automation, and developer-friendly delivery workflows in one workspace. The platform is built to sit on top of existing sending providers, including SendGrid, Postmark, Amazon SES, Mailgun, Resend, and SparkPost. This allows teams to improve how emails are created and managed while continuing to rely on trusted providers for actual delivery. Coldletter’s editor lets users design emails like documents, using drag-and-drop blocks, reusable partials, typed variables, and real-time previews. Templates are built to be responsive, accessible, and dark-mode-safe, reducing the need for manual table-based HTML or MJML workarounds. Developers can send any template with one API call while Coldletter merges customer data, renders the email, chooses the configured route, and handles delivery safeguards. The platform also includes automation journeys with triggers, delays, branching logic, A/B testing, and scheduled sends. Teams can manage template versions like code, review diffs, roll back changes, run test sends, and require approvals before updates reach production. Localization features allow companies to create translated template variants that resolve automatically at send time. Unified analytics help teams track opens, clicks, bounces, and deliverability across multiple providers. Coldletter helps product, lifecycle, design, and engineering teams create better emails faster while keeping delivery reliable and workflows organized.

Media

Media

No images available

Integrations Supported

Sapiency

Integrations Supported

Amazon SES
Postmark
SendGrid

API Availability

API Availability

Pricing Information

Pricing not provided
Free Trial Offered?

Pricing Information

$0
Free Version

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Mosaico

Date Founded

2015

Company Website

mosaico.io

Company Facts

Organization Name

Optosoftware inc.

Date Founded

2025

Company Location

Canada

Company Website

coldletter.com

Categories and Features

Email Template Design

Not specified

Categories and Features

Email Marketing

Not specified

Email Template Design

Not specified

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