Coldletter

Coldletter

Optosoftware inc.
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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.

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.

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

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

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

Audience

Businesses that want email marketing using Amazon SES, Postmark, SendGrid, and other SMTP services.

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$0
Free Version Supported
Free Trial Not Supported

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 Not Supported
Free Trial Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Supported

Company Information

Optosoftware inc.
Founded: 2025
Canada
coldletter.com

Company Information

Mailrith
Founded: 2026
India
mailrith.com

Alternatives

Alternatives

AledaMail

AledaMail

Senders
AledaMail

AledaMail

Senders
Coldletter

Coldletter

Optosoftware inc.
sendbunny

sendbunny

Sendbunny
SendGrid

SendGrid

Twilio SendGrid
sendbunny

sendbunny

Sendbunny

Categories

Categories

Email Marketing Supported

Email Marketing Features

A/B Testing Not Supported
Artificial Intelligence Supported
Auto-Responders Supported
CAN SPAM Compliance Supported
Customer Surveys Not Supported
Drip Campaigns Supported
Dynamic Content Not Supported
Event Triggered Email Supported
Image Library Supported
Landing Pages/Web Forms Supported
Mailing List Management Supported
Mobile Optimized Emails Supported
Reporting/Analytics Supported
Subscriber Management Supported
Template Management Supported
WYSIWYG Email Editor Not Supported

Integrations

Amazon SES Supported
Postmark Supported
SendGrid Supported
Brevo Not Supported
ChatGPT Not Supported
Claude Not Supported
Mailgun Not Supported
Resend Not Supported
Zapier Not Supported

Integrations

Amazon SES Supported
Postmark Supported
SendGrid Supported
Brevo Supported
ChatGPT Supported
Claude Supported
Mailgun Supported
Resend Supported
Zapier Supported
Claim Coldletter and update features and information
Claim Coldletter and update features and information
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Claim Mailrith and update features and information