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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

Completely free for up to 500 contacts with no limitations on features or support, this platform offers a user-friendly Drag & Drop email designer featuring over 70 customizable design blocks. Each account comes equipped with ready-to-use email templates, 1,000 email credits, and 10 SMS credits, providing ample resources for effective communication. Unlike competitors such as Klaviyo, Mailchimp, and Sendgrid, our sending servers are based in the EU, ensuring that your data remains within European borders. Additionally, you have the option to include a "Do Not Track" feature in your sign-up forms to respect user privacy. By recommending Sensorpro, you can earn lifetime revenue, and the platform offers all the necessary tools for managing an agency account. Whether you're a small business or managing a high volume of emails, our independent infrastructure is designed to scale and handle up to 1 million emails daily without relying on third-party services like Amazon or Sendgrid, providing both reliability and flexibility for all users. Furthermore, our commitment to customer support ensures that users feel supported throughout their experience.

API Access

Has API No 

API Access

Has API No 

Screenshots View All

No images available

Screenshots View All

Integrations

Amazon SES Yes 
BigCommerce No 
KonnectzIT No 
Postmark Yes 
SendGrid Yes 
Shopify No 
Ultra Commerce No 

Integrations

Amazon SES No 
BigCommerce Yes 
KonnectzIT Yes 
Postmark No 
SendGrid No 
Shopify Yes 
Ultra Commerce Yes 

Pricing Details

$0
Free Trial No 
Free Version Yes 

Pricing Details

No price information available.
Free Trial No 
Free Version Yes 

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 Yes 
Mac No 
Linux No 
Chromebook No 

Customer Support

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

Customer Support

Business Hours Yes 
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 No 
Webinars No 
Live Training (Online) No 
In Person No 

Vendor Details

Company Name

Optosoftware inc.

Founded

2025

Country

Canada

Website

coldletter.com

Vendor Details

Company Name

Sensorpro

Founded

2001

Country

Ireland

Website

sensorpro.eu

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 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 

SMS Survey

Alerts / Notifications No 
Analytics / Reporting No 
Audience Targeting No 
Campaign Management No 
Contact Management No 
Customizable Templates No 
Keyword Tracking No 
MMS No 
Mass Texting No 
Message Personalization No 
Scheduled Messaging No 
Survey Builder No 
Template Management No 

Survey

Custom Survey URLs No 
Data Analysis Tools Yes 
Email Marketing Yes 
Mobile Survey Yes 
Offline Response Collection No 
Paper Survey No 
Question Branching Yes 
Question Library No 
Site Intercept Survey No 
Skip Logic Yes 
Supports Audio / Images / Video Yes 

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