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

SendOps is an email workflow and drip campaign platform for onboarding, trial conversion, cart recovery, follow-ups, and win-back journeys. Build on a visual canvas or use SendFlow, the API, or AI agents through MCP. Trigger journeys from product events, segment changes, dates, or recognized website visits; personalize emails, branch on behavior, wait for milestones, and exit on conversion. Webhook steps connect journeys to SMS, push, and your own systems. Manage contacts, dynamic segments, consent, templates, and broadcasts. Rehearse in shadow mode and track delivery, engagement, and each contact's progress. Send through Amazon SES in your own AWS account with a guided, keyless connection. Existing transactional sending stays independent. Flat platform pricing with no per-contact or per-email SendOps fees. Free plan available; AWS usage billed separately. Includes message search, deliverability alerts, DMARC monitoring, and inbound email.

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

Marketing, product, and development teams automating customer onboarding, trial conversion, cart recovery, and retention with email workflows on their own Amazon SES.

Support

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

Support

Phone Support Not Supported
24/7 Live Support Not 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

$29/month
Free plan available. Team: $29/month. Business: $149/month. Flat platform subscription with no per-contact or per-email SendOps fees. AWS usage is billed separately.
Free Version Supported
Free Trial Not 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:

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Reviews/Ratings

Overall 5.0 / 5
ease 4.0 / 5
features 4.0 / 5
design 5.0 / 5
support 5.0 / 5

Pros & Cons from Real Users

Pros

  • Easy and secure setup (Cloud Formation stacks + STS setup) which means we don't have to expose any API keys. Really good dashboard + metrics and reputation alerts.

Cons

  • You still need to setup your SES account directly with AWS.

Training

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

Training

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

Company Information

Optosoftware inc.
Founded: 2025
Canada
coldletter.com

Company Information

SendOps
Founded: 2025
United States
sendops.dev/

Alternatives

Alternatives

AledaMail

AledaMail

Senders
sendbunny

sendbunny

Sendbunny
SendGrid

SendGrid

Twilio SendGrid

Categories

Categories

Email Marketing Supported

Integrations

Amazon SES Supported
Postmark Supported
SendGrid Supported

Integrations

Amazon SES Supported
Postmark Not Supported
SendGrid Not Supported
Claim Coldletter and update features and information
Claim Coldletter and update features and information
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Claim SendOps and update features and information