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Average Ratings 8 Ratings

Total
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features
design
support

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

Partner with the email service trusted by developers and marketers for time-savings, scalability, and delivery expertise. The Twilio SendGrid Email API and proprietary Mail Transfer Agent (MTA), intuitive console, powerful features, and email experts make it easy to ensure all your email gets delivered in seconds and without interruption. Whether you’re sending 100 emails or 100 billion, SendGrid is built to scale, while maximizing inbox placement and protecting your reputation as a trusted sender. Monitor engagement data and optimize deliverability with our Deliverability Insights dashboard. Integrate with our RESTful APIs and SMTP in minutes, with sample code libraries available in 7 languages, interactive docs, templates, and more.

API Access

Has API No 

API Access

Has API Yes 

Screenshots View All

No images available

Screenshots View All

Integrations

Airplane No 
Blueshift No 
Clay No 
CrossEngage No 
EventAgent.ai No 
Fresh Relevance No 
Iconicus Commerce No 
MLM Protec No 
Meltano No 
Nango No 
Remarkety No 
Salesmachine No 
ShipX360 No 
SpiceCRM No 
Stadio No 
Sublytics No 
Teamleader No 
Tilavon No 
TomaCRM No 
ViralSweep No 

Integrations

Airplane Yes 
Blueshift Yes 
Clay Yes 
CrossEngage Yes 
EventAgent.ai Yes 
Fresh Relevance Yes 
Iconicus Commerce Yes 
MLM Protec Yes 
Meltano Yes 
Nango Yes 
Remarkety Yes 
Salesmachine Yes 
ShipX360 Yes 
SpiceCRM Yes 
Stadio Yes 
Sublytics Yes 
Teamleader Yes 
Tilavon Yes 
TomaCRM Yes 
ViralSweep Yes 

Pricing Details

$0
Free Trial No 
Free Version Yes 

Pricing Details

$19.95 per month
Free - $0/mo for 100 emails/day forever
Essentials - starting at $19.95/mo
Pro - starting at $89.95/mo
Premier - custom pricing
Free Trial Yes 
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 No 
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) Yes 
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 Yes 
Live Training (Online) Yes 
In Person No 

Vendor Details

Company Name

Optosoftware inc.

Founded

2025

Country

Canada

Website

coldletter.com

Vendor Details

Company Name

Twilio SendGrid

Founded

2009

Country

United States

Website

sendgrid.com/en-us

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

eCommerce Marketing

AB Testing No 
Abandoned Cart Email No 
Analytics / ROI Tracking No 
Customer Data Profiles No 
Dynamic Content No 
Email Marketing Yes 
Email Personalization Yes 
Facebook Ads No 
Google Ads No 
Product Recommendations No 
Push Notifications No 
Retargeting No 
SMS Marketing No 
Search Marketing No 
Segmentation No 
Signup Forms & Popups No 
Social Marketing No 
Triggered Emails Yes 
Website Visitor Tracking No 

Email Deliverability

DMARC Analytics No 
Deliverability Alerts No 
Deliverability Reporting No 
Email Address Verification No 
Email Content Testing No 
Email Previewing No 
IP Blacklist Monitoring No 
Inbox Placement Testing No 
Reputation Reporting No 

Email Management

Data Recovery Yes 
Email Archiving No 
Email Deletion No 
Email Discovery No 
Email Monitoring Yes 
Email Recall No 
Queue Manager Yes 
Response Management Yes 
Routing Yes 
Shared Inboxes No 
Signature Management Yes 
Spam Blocker No 
Whitelisting / Blacklisting Yes 

Email Marketing

A/B Testing No 
Artificial Intelligence No 
Auto-Responders Yes 
CAN SPAM Compliance Yes 
Customer Surveys Yes 
Drip Campaigns No 
Dynamic Content Yes 
Event Triggered Email Yes 
Image Library No 
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 Yes 

Email Template Design

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

Email Testing

A/B Testing Yes 
Accessibility Testing Yes 
DMARC Analytics Yes 
Deliverability Rates Yes 
HTML Validation Yes 
IP Blacklist Checking Yes 
Improvement Recommendations Yes 
Pre-Send Email Testing Yes 
Preview Across Browsers & Devices Yes 
Reporting / Analytics Yes 
Sender Reputation Scoring Yes 
Spam Testing Yes 

Email Tracking

A/B Testing Yes 
Audience Segmentation Yes 
Campaign Management Yes 
Event-Based Notifications Yes 
Location Tracking Yes 
Team Management Yes 

Email Verification

Bulk Email Verification Yes 
Catch-all Server Detection Yes 
Disposable Email Detection Yes 
Domain Check Yes 
Mail Server Validation Yes 
Single Email Verification Yes 
Spam Trap Detection Yes 
Syntax Check Yes 

Marketing Automation

A/B Testing Yes 
Analytics / ROI Tracking Yes 
Artificial Intelligence Yes 
Content / Blogging Platform Yes 
Customizable CTAs Yes 
Drip Campaigns Yes 
Dynamic Content Yes 
Landing Pages / Web Forms Yes 
Lead Scoring Yes 
Sales Intelligence No 
Search Marketing Yes 
Segmentation Yes 
Social Marketing No 
Website Visitor Tracking Yes 

Transactional Email

A/B Testing Yes 
Contact Database No 
Dynamic Content Yes 
Email Monitoring Yes 
Mailing List Management No 
Reporting/Analytics Yes 
Spam Check No 
Template Management Yes 

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