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
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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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
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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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
Free Trial
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Pricing
$12/month
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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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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Categories |
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Integrations
Amazon SES
Postmark
SendGrid
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