ColdletterOptosoftware inc.
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Related Products
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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.
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About
Drip Drop is an email and SMS marketing automation tool that runs on your own provider accounts. Connect SendGrid, Mailgun, Gmail, Outlook, SMTP, Twilio, or Telnyx and you send at provider cost, no per-contact markup on top of what you already pay to send.
You build campaigns in a drag-and-drop flow builder: triggers, delays, branching, and timezone-aware scheduling, with email or SMS at each step. Import and manage contacts, segment and organize with tags and custom fields, start from a template or have AI draft the copy, then track opens, clicks, and delivery per flow. Webhooks and a public API connect it to what you already run, and unsubscribes, STOP/HELP, and consent handling are built in.
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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
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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
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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
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Audience
Small businesses, startups, founders, small marketing teams, growing businesses
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
Not Supported
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Screenshots and VideosNo images available
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Screenshots and Videos |
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Pricing
$0
Free Version
Supported
Free Trial
Not Supported
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Pricing
Free
Free Version
Supported
Free Trial
Supported
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Reviews/
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Reviews/
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationOptosoftware inc.
Founded: 2025
Canada
coldletter.com
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Company InformationDrip Drop
Founded: 2025
United States
dripdrop.dev/
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Categories |
Categories |
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Integrations
SendGrid
Supported
Amazon SES
Supported
Gmail
Not Supported
Mailgun
Not Supported
Microsoft Outlook
Not Supported
Postmark
Supported
Telnyx
Not Supported
Twilio
Not Supported
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Integrations
SendGrid
Supported
Amazon SES
Not Supported
Gmail
Supported
Mailgun
Supported
Microsoft Outlook
Supported
Postmark
Not Supported
Telnyx
Supported
Twilio
Supported
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