Coldletter

Coldletter

Optosoftware inc.
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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

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.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

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

Small businesses, startups, founders, small marketing teams, growing businesses

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

No images available

Screenshots and Videos

No images available

Pricing

$0
Free Version
Free Trial

Pricing

Free
Free Version
Free Trial

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 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

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Optosoftware inc.
Founded: 2025
Canada
coldletter.com

Company Information

Drip Drop
Founded: 2025
United States
dripdrop.dev/

Alternatives

Alternatives

SendGrid

SendGrid

Twilio SendGrid
SendGrid

SendGrid

Twilio SendGrid

Categories

Categories

Integrations

SendGrid
Amazon SES
Gmail
Mailgun
Microsoft Outlook
Postmark
Telnyx
Twilio

Integrations

SendGrid
Amazon SES
Gmail
Mailgun
Microsoft Outlook
Postmark
Telnyx
Twilio
Claim Coldletter and update features and information
Claim Coldletter and update features and information
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Claim Drip Drop and update features and information