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
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.
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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
Marketing, product, and development teams automating customer onboarding, trial conversion, cart recovery, and retention with email workflows on their own Amazon SES.
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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
Supported
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Screenshots and VideosNo images available
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Pricing
$0
Free Version
Supported
Free Trial
Not Supported
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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
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Reviews/
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Reviews/
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Pros & Cons from Real UsersPros
Cons
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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 InformationSendOps
Founded: 2025
United States
sendops.dev/
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Categories |
Categories |
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Integrations
Amazon SES
Supported
Postmark
Not Supported
SendGrid
Not Supported
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