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
Mailrith is an email marketing and automation platform built for startups, creators, newsletter operators, small businesses, agencies, and growing teams.
It helps users grow their Subscriber lists through hosted forms, embedded forms, and landing pages, then organize those Subscribers using tags, custom fields, and dynamic segments. Users can send one-time Broadcasts, create automated Sequences, build visual Automations, manage reusable email templates, and use Magic Links to trigger actions when links are clicked.
Mailrith also supports bring-your-own SMTP through Amazon SES, Postmark, SendGrid, Mailgun, Resend, Brevo, or a custom SMTP provider, giving users greater control over their sending infrastructure. Team workspaces, permissions, API access, webhooks, and OAuth support make it suitable for both everyday email marketing and more advanced connected workflows.
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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
Businesses that want email marketing using Amazon SES, Postmark, SendGrid, and other SMTP services.
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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 Videos |
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Pricing
$0
Free Version
Free Trial
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Pricing
$29/month
Fixed Pricing (Pricing doesn't increase with number of subscribers or emails sent)
Available Plans: 1. Solo Plan - $29/month or $290/year 2. Pro Plan - $49/month or $490/year 3. Agency Plan - $149/month or $1490/year (Additional Workspaces available at $12/month/workspace)
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 InformationMailrith
Founded: 2026
India
mailrith.com
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Categories |
Categories |
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Email Marketing Features
A/B Testing
Artificial Intelligence
Auto-Responders
CAN SPAM Compliance
Customer Surveys
Drip Campaigns
Dynamic Content
Event Triggered Email
Image Library
Landing Pages/Web Forms
Mailing List Management
Mobile Optimized Emails
Reporting/Analytics
Subscriber Management
Template Management
WYSIWYG Email Editor
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Integrations
Amazon SES
Postmark
SendGrid
Brevo
ChatGPT
Claude
Mailgun
Resend
Zapier
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Integrations
Amazon SES
Postmark
SendGrid
Brevo
ChatGPT
Claude
Mailgun
Resend
Zapier
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