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What is Coldletter?

Coldletter is a product email platform that combines visual email design, template management, automation, and developer-friendly delivery workflows in one workspace. The platform is built to sit on top of existing sending providers, including SendGrid, Postmark, Amazon SES, Mailgun, Resend, and SparkPost. This allows teams to improve how emails are created and managed while continuing to rely on trusted providers for actual delivery. Coldletter’s editor lets users design emails like documents, using drag-and-drop blocks, reusable partials, typed variables, and real-time previews. Templates are built to be responsive, accessible, and dark-mode-safe, reducing the need for manual table-based HTML or MJML workarounds. Developers can send any template with one API call while Coldletter merges customer data, renders the email, chooses the configured route, and handles delivery safeguards. The platform also includes automation journeys with triggers, delays, branching logic, A/B testing, and scheduled sends. Teams can manage template versions like code, review diffs, roll back changes, run test sends, and require approvals before updates reach production. Localization features allow companies to create translated template variants that resolve automatically at send time. Unified analytics help teams track opens, clicks, bounces, and deliverability across multiple providers. Coldletter helps product, lifecycle, design, and engineering teams create better emails faster while keeping delivery reliable and workflows organized.

What is BigMailer?

Consolidate all your email marketing efforts into a single platform that offers exceptional return on investment. You can execute all your email campaigns seamlessly in one location, eliminating the need for multiple service providers. Manage all your brands and assets efficiently from a centralized hub, allowing both clients and your team to access the same resources. Each paid plan supports an unlimited number of brands and user accounts, making it particularly advantageous for agencies. Additionally, you have the ability to send transactional or drip emails triggered by customizable events or API calls. Create a dedicated Unsubscribe page that reflects your branding with your logo and preferred settings. The Free Startup plan provides the capability to store up to 1,000 contacts and send 2,000 emails monthly. Experience the benefit of UNLIMITED custom sending addresses, complete with optional DKIM and SPF configurations. Contacts can be organized across multiple lists without incurring extra charges, and you only pay based on the number of unique subscribers. Manage various clients, products, and websites effortlessly by adding unlimited brands from the main dashboard, where everything is neatly categorized into brands, including lists of campaigns, templates, and forms. This streamlined organization enhances your marketing strategy and improves overall efficiency.

Media

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Media

Integrations Supported

Amazon SES
Postmark
SendGrid

Integrations Supported

Amazon SES
KonnectzIT
Make
Pabbly Connect
Quickwork
Stackreaction
Upper
Zapier

API Availability

API Availability

Has API

Pricing Information

$0
Free Version

Pricing Information

$10 per month
$1 per 1000 contacts per month
Free Version
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Standard Support
Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub
Online Training

Company Facts

Organization Name

Optosoftware inc.

Date Founded

2025

Company Location

Canada

Company Website

coldletter.com

Company Facts

Organization Name

Founder Bits

Date Founded

2016

Company Location

United States

Company Website

www.bigmailer.io

Categories and Features

Email Marketing

Not specified

Email Template Design

Not specified

Categories and Features

Bulk Email

Not specified

Email Marketing

Auto-Responders
CAN SPAM Compliance
Drip Campaigns
Dynamic Content
Event Triggered Email
Image Library
Landing Pages/Web Forms
Mailing List Management
Mobile Optimized Emails
Reporting/Analytics
Subscriber Management
Template Management
WYSIWYG Email Editor

Email Template Design

Not specified

Marketing Automation

Analytics / ROI Tracking
Customizable CTAs
Drip Campaigns
Dynamic Content
Landing Pages / Web Forms
Segmentation
Website Visitor Tracking

Transactional Email

Not specified

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