Coldletter

Coldletter

Optosoftware inc.
SendGrid

SendGrid

Twilio SendGrid
+
+

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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

Email is the backbone of your customer engagement. The Twilio SendGrid Email API is the email service trusted by developers and marketers for time-savings, scalability, and delivery expertise. Our flexible 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. Monitor engagement data and optimize deliverability with our Deliverability Insights dashboard. Whether you’re sending 100 emails or 100 billion, SendGrid is built to scale. Integrate with our RESTful APIs and SMTP in minutes, with sample code libraries available in 7 languages, interactive docs, templates, and more.

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

Companies of all sizes searching for an email API to deliver an exceptional email experience

Support

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

Support

Phone Support Supported
24/7 Live Support 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

$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 Version 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 3.9 / 5
ease 4.0 / 5
features 3.9 / 5
design 4.1 / 5
support 3.9 / 5

Pros & Cons from Real Users

Pros

  • Ok, thanks for the opportunity, be honest, these are my feedback after useing, please check below. first pro: 80% successful rate to find right email. second pro: most of time input first name and family name with company website, i can find right email.
  • Emails actually get delivered unlike some other email marketing services and transactional email services we were using prior to SendGrid.
  • Almost nothing. The system is too barebones, can't put emojis in emails, very little actual customization, other platforms are much better.
  • I did like that the software was easy to use. It had a very user-friendly interface and made things easy to navigate through. Uploading contacts was a streamlined process.
  • Sendgrid allows our company to send updates to a vast array of consumers through email. The credentials built through Sendgrid software allow our emails to not end up in the Junk Folder.

Cons

  • First con: if a person has many job positions at different companies, you only can obtain the first company information and existing person emails. Second con: it can't link with more social channels, like Twitter or Instagram and can't grab email in pictures and PDF files, also many information shows in Google but can't be found here. Third con: RocketReach can find the right email but usually GetEmail can't. Fourth con: the cost is high for monthly, and can't get free credits most of times. That's all the cons I found, i have been using this tool for more than one and a half years, anyway, thank you very much, hope your team can improve and do better.
  • No cons for our use cases. Does everything we need it to do.
  • First of all the service didn't work. The campaigns wouldn't be sent at all and I had to call customer support. EVERY TIME. And it would take time, hours DAYS, every time. So we lost a lot in proper campaign timing, leads would get cold. We lost ROI there.
  • I didn't like that their shared IP still got bad ratings. I used a few of their competitors before this, and was getting much better open rates using the same emails on the other platforms.
  • I needed a lot of help setting up my account. It would be helpful to have a more user-friendly set up.

Training

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

Training

Documentation Supported
Webinars Supported
Live Online Supported
In Person Not Supported

Company Information

Optosoftware inc.
Founded: 2025
Canada
coldletter.com

Company Information

Twilio SendGrid
Founded: 2009
United States
sendgrid.com/en-us

Alternatives

Alternatives

AledaMail

AledaMail

Senders
sendbunny

sendbunny

Sendbunny
SMTP.com

SMTP.com

Ziff Davis
SendGrid

SendGrid

Twilio SendGrid

Categories

Categories

Bulk Email Supported
Email APIs Supported
Email Management Supported
Email Marketing Supported
Email Testing Supported
Email Tracking Supported
Email Verification Supported
SMTP Supported

Email Marketing Features

A/B Testing Not Supported
Artificial Intelligence Not Supported
Auto-Responders Supported
CAN SPAM Compliance Supported
Customer Surveys Supported
Drip Campaigns Not Supported
Dynamic Content Supported
Event Triggered Email Supported
Image Library Not 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 Supported

Email Template Design Features

A/B Testing Not Supported
Code From Scratch Not Supported
Drag & Drop Editing Supported
Image Library Not Supported
Import HTML Code Not Supported
Mobile-Friendly / Responsive Supported
Potential Issue Identification Not Supported
Premade Templates Supported
Proofing Not Supported
Reporting / Analytics Supported
Text Editor Supported
Theme Editor Supported

Email Management Features

Data Recovery Supported
Email Archiving Not Supported
Email Deletion Not Supported
Email Discovery Not Supported
Email Monitoring Supported
Email Recall Not Supported
Queue Manager Supported
Response Management Supported
Routing Supported
Shared Inboxes Not Supported
Signature Management Supported
Spam Blocker Not Supported
Whitelisting / Blacklisting Supported

Email Testing Features

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

Email Tracking Features

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

Email Verification Features

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

Marketing Automation Features

A/B Testing Supported
Analytics / ROI Tracking Supported
Artificial Intelligence Supported
Content / Blogging Platform Supported
Customizable CTAs Supported
Drip Campaigns Supported
Dynamic Content Supported
Landing Pages / Web Forms Supported
Lead Scoring Supported
Sales Intelligence Not Supported
Search Marketing Supported
Segmentation Supported
Social Marketing Not Supported
Website Visitor Tracking Supported

Transactional Email Features

A/B Testing Supported
Contact Database Not Supported
Dynamic Content Supported
Email Monitoring Supported
Mailing List Management Not Supported
Reporting/Analytics Supported
Spam Check Not Supported
Template Management Supported

eCommerce Marketing Features

AB Testing Not Supported
Abandoned Cart Email Not Supported
Analytics / ROI Tracking Not Supported
Customer Data Profiles Not Supported
Dynamic Content Not Supported
Email Marketing Supported
Email Personalization Supported
Facebook Ads Not Supported
Google Ads Not Supported
Product Recommendations Not Supported
Push Notifications Not Supported
Retargeting Not Supported
Search Marketing Not Supported
Segmentation Not Supported
Signup Forms & Popups Not Supported
SMS Marketing Not Supported
Social Marketing Not Supported
Triggered Emails Supported
Website Visitor Tracking Not Supported

Integrations

123worx Not Supported
Abstra Not Supported
AcelleMail Not Supported
Apollo Not Supported
Campaign Genius Not Supported
Centrex Software Not Supported
Clougistic Not Supported
Filmo Not Supported
Focus X Not Supported
Follow Up Boss Not Supported
MyFormData Not Supported
Privy Not Supported
Quickwork Not Supported
Rekomi Not Supported
ScrumGenius Not Supported
SweepWidget Not Supported
Unifonic Not Supported
Voucherify Not Supported
Warmbox Not Supported
Zoho Flow Not Supported

Integrations

123worx Supported
Abstra Supported
AcelleMail Supported
Apollo Supported
Campaign Genius Supported
Centrex Software Supported
Clougistic Supported
Filmo Supported
Focus X Supported
Follow Up Boss Supported
MyFormData Supported
Privy Supported
Quickwork Supported
Rekomi Supported
ScrumGenius Supported
SweepWidget Supported
Unifonic Supported
Voucherify Supported
Warmbox Supported
Zoho Flow Supported
Claim Coldletter and update features and information
Claim Coldletter and update features and information
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