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What is stensul?

Email Generation System. The process of crafting emails can be significantly streamlined without the necessity for extra personnel or sacrificing quality. Stensul works effortlessly with leading automation tools. By leveraging this platform, you can enhance your team's efficiency without the burden of hiring more staff or lowering standards. Built-in guidelines empower marketers to produce emails in just a matter of minutes. It promotes teamwork, enabling groups to design effective emails that achieve desired outcomes. Rather than relying on fragmented communication tools, a comprehensive platform unites all team members for better collaboration and efficiency. This ensures that everyone is on the same page, ultimately leading to improved project outcomes.

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.

Media

Media

No images available

Integrations Supported

Acoustic Campaign
Adobe Campaign
Adobe Marketo Engage
Brandfolder
Braze
Eloqua
HubSpot CRM
HubSpot Customer Platform
HubSpot Marketing Hub
Iterable
Marigold Engage
Marigold Engage+
Microsoft Outlook
Movable Ink
Oracle Responsys
Salesforce Agentforce Marketing
Salesforce Marketing Cloud Account Engagement

Integrations Supported

Amazon SES
Postmark
SendGrid

API Availability

API Availability

Pricing Information

Pricing not provided

Pricing Information

$0
Free Version

Supported Platforms

Not specified

Supported Platforms

SaaS

Customer Service / Support

Standard Support
Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Not specified

Training Options

Documentation Hub

Company Facts

Organization Name

stensul

Company Location

United States

Company Website

stensul.com

Company Facts

Organization Name

Optosoftware inc.

Date Founded

2025

Company Location

Canada

Company Website

coldletter.com

Categories and Features

Email Marketing

A/B Testing
CAN SPAM Compliance
Dynamic Content
Image Library
Mobile Optimized Emails
Template Management

Email Template Design

Not specified

Categories and Features

Email Marketing

Not specified

Email Template Design

Not specified

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