Average Ratings 0 Ratings

Total
ease
features
design
support

No User Reviews. Be the first to provide a review:

Write a Review

Average Ratings 0 Ratings

Total
ease
features
design
support

No User Reviews. Be the first to provide a review:

Write a Review

Description

Coldletter is an email design and automation layer that helps teams create, manage, and send product emails without replacing their existing email provider. It connects with delivery services such as SendGrid, Postmark, Amazon SES, Mailgun, Resend, and SparkPost, giving companies flexibility while keeping sending infrastructure intact. The platform includes a visual editor where teams can build templates, add variables, reuse blocks, and preview emails across clients such as Gmail, Outlook, and Apple Mail. Every template is designed to be responsive, accessible, and safe for dark mode by default. Developers can trigger templates through a single API request while Coldletter handles rendering, data merging, routing, retries, suppression, and idempotency. Marketing, lifecycle, design, and product teams can use the platform to manage email content without constantly relying on engineering for every change. Journey automation tools allow users to create workflows based on events, schedules, engagement, attributes, or A/B testing paths. Version control, template diffs, rollbacks, localization, test sends, roles, approvals, and analytics help teams manage production emails with more confidence. Coldletter gives organizations a structured way to build polished product emails while improving collaboration between technical and non-technical teams.

Description

Mailrith is an email marketing and automation platform built for startups, creators, newsletter operators, small businesses, agencies, and growing teams. Users can collect Subscribers through hosted forms, embedded forms, and landing pages, then organize them using tags, custom fields, and dynamic segments. They can send one-time Broadcasts, create automated Sequences, build visual Automations, manage reusable email templates, and use Magic Links to trigger actions when Subscribers click links. Mailrith also supports bring-your-own SMTP through Amazon SES, Postmark, SendGrid, Mailgun, Resend, Brevo, or a custom SMTP server. This gives users greater control over their email infrastructure and sending costs. For teams and developers, Mailrith includes shared workspaces, user permissions, API access, webhooks, OAuth support, and TypeScript and Python SDKs. This makes it suitable for both everyday email marketing and more advanced, connected business workflows.

API Access

Has API No 

API Access

Has API Yes 

Screenshots View All

No images available

Screenshots View All

Integrations

Amazon SES Yes 
Postmark Yes 
SendGrid Yes 
Brevo No 
ChatGPT No 
Claude No 
Mailgun No 
Resend No 
Zapier No 

Integrations

Amazon SES Yes 
Postmark Yes 
SendGrid Yes 
Brevo Yes 
ChatGPT Yes 
Claude Yes 
Mailgun Yes 
Resend Yes 
Zapier Yes 

Pricing Details

$0
Free Trial No 
Free Version Yes 

Pricing Details

$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 Trial Yes 
Free Version No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person Yes 

Vendor Details

Company Name

Optosoftware inc.

Founded

2025

Country

Canada

Website

coldletter.com

Vendor Details

Company Name

Mailrith

Founded

2026

Country

India

Website

mailrith.com

Product Features

Email Marketing

A/B Testing No 
Artificial Intelligence No 
Auto-Responders No 
CAN SPAM Compliance No 
Customer Surveys No 
Drip Campaigns No 
Dynamic Content No 
Event Triggered Email No 
Image Library No 
Landing Pages/Web Forms No 
Mailing List Management No 
Mobile Optimized Emails No 
Reporting/Analytics No 
Subscriber Management No 
Template Management No 
WYSIWYG Email Editor No 

Email Template Design

A/B Testing No 
Code From Scratch No 
Drag & Drop Editing No 
Image Library No 
Import HTML Code No 
Mobile-Friendly / Responsive No 
Potential Issue Identification No 
Premade Templates No 
Proofing No 
Reporting / Analytics No 
Text Editor No 
Theme Editor No 

Product Features

Email Marketing

A/B Testing No 
Artificial Intelligence Yes 
Auto-Responders Yes 
CAN SPAM Compliance Yes 
Customer Surveys No 
Drip Campaigns Yes 
Dynamic Content No 
Event Triggered Email Yes 
Image Library Yes 
Landing Pages/Web Forms Yes 
Mailing List Management Yes 
Mobile Optimized Emails Yes 
Reporting/Analytics Yes 
Subscriber Management Yes 
Template Management Yes 
WYSIWYG Email Editor No 

Alternatives

AledaMail Reviews

AledaMail

Senders

Alternatives

Coldletter Reviews

Coldletter

Optosoftware inc.
AledaMail Reviews

AledaMail

Senders
SendGrid Reviews

SendGrid

Twilio SendGrid