ColdletterOptosoftware inc.
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Related Products
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About
Coldletter is an email templating and automation platform built for product and engineering teams that need better control over the emails their applications send. The platform works on top of providers such as SendGrid, Postmark, Amazon SES, Mailgun, Resend, and SparkPost, allowing teams to keep their existing delivery stack. Users can design responsive, accessible, and dark-mode-safe email templates with a visual editor instead of hand-coding complex HTML or MJML. Coldletter also supports reusable blocks, typed variables, live previews, test sends, localization, version control, and approval workflows. Its automation tools let teams build email journeys with triggers, waits, branches, A/B testing, and delivery analytics. Coldletter helps teams design, automate, manage, and deliver product emails more reliably from one centralized workspace.
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About
Mailvex is an email builder for teams that need on-brand emails without a designer or a developer.
You assemble an email from ready blocks and your brand kit is applied automatically. Upload a PDF brand book and Mailvex extracts colours, fonts, logo and spacing, then applies them across every template.
The compiler handles what makes email coding a separate craft: table-based layout, inline styles, dark mode support, mobile spacing and a running weight counter that keeps emails under the clipping limit.
AI covers the routine: generate a whole email from a description, rewrite a block, produce subject lines, write alt text or translate an email. Layouts can be imported from Figma, from a screenshot or from existing HTML.
The output is clean HTML that pastes into any sending platform, with merge-tag profiles so personalisation works without editing code.
160 templates across 10 industries, four interface languages, free plan with no time limit.
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
Coldletter is designed for product teams, engineering teams, lifecycle marketers, SaaS companies, and developers that need a centralized platform for designing, automating, versioning, and sending product emails through existing providers
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Audience
Marketers, ecommerce teams, email agencies, online schools and designers who create email campaigns without a dedicated email developer
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
Not Supported
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Screenshots and VideosNo images available
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Screenshots and VideosNo images available
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Pricing
$0
Free Version
Supported
Free Trial
Not Supported
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Pricing
$12/month
Free Version
Supported
Free Trial
Supported
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Reviews/
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Reviews/
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationOptosoftware inc.
Founded: 2025
Canada
coldletter.com
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Company InformationMailvex
Founded: 2026
mailvex.tech
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Integrations
Amazon SES
Not Supported
Postmark
Not Supported
SendGrid
Not Supported
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