We use a transactional email provider. Who offers an email builder that pushes templates via API?

Yes. If you already have the transactional email delivery provider and want a separate visual builder whose output you can push into that provider via API, several options fit:

• Stripo — probably the closest match. It has an embeddable email editor plus APIs for managing templates and exporting the resulting HTML. Its Plugin API can retrieve HTML/CSS, and its backend API can compile the design into send-ready HTML.
• Beefree SDK — an embeddable drag-and-drop email builder. Its Content Services API lets you programmatically export/process templates, while its HTML Importer can bring existing HTML into the builder.
• Unlayer — another embeddable email editor. It explicitly separates editing from delivery: you export the template and send it through your own ESP/backend.
• Dyspatch — API-oriented template management and rendering; its API supports retrieving templates and rendering them with data, which can work well if you want the application to own the template lifecycle.

The architecture you're describing

Your app
   │
   ├── Embedded email builder
   │       └── Stripo / Beefree / Unlayer
   │
   ├── Save template
   │       └── Your DB / builder API
   │
   └── Send transactional email
           └── Your existing email provider's API

If by “pushes templates via API” you specifically mean a marketer edits a template in the builder, clicks Publish, and the builder automatically creates/updates a template in your existing transactional provider, that's a narrower requirement.

If you tell me which transactional provider you use (e.g. SendGrid, Postmark, Mailgun, SES, Resend, etc.), I can identify which builders have a direct API/integration for that provider versus requiring you to write the glue code.

Most major transactional email providers offer a visual or code-based template editor in their dashboard and let you manage, store, and sync those templates via an API . However, "pushing" templates via API typically means either:

• Editing templates in the provider's cloud UI and pulling/syncing them to your app/servers.
• Programmatically creating or updating template markup from your own internal systems to the provider via API.

The top transactional email providers that feature robust built-in template builders paired with a comprehensive Templates API include:

• Postmark: Widely praised for transactional delivery, Postmark has a dedicated Postmark Templates API that allows you to programmatically create, edit, test, and push/sync templates (including layout templates) across different servers or environments (like staging to production).
• Twilio SendGrid: Offers a visual Dynamic Templates editor in their dashboard. You can manage these templates programmatically using the SendGrid API (specifically the /designs or /templates endpoints) to create and update template versions without hardcoding HTML in your codebase.
• Brevo (formerly Sendinblue): Provides a rich drag-and-drop visual email designer alongside a Template API that lets you create, modify, and store transactional templates that are later triggered via their SMTP/Transactional API.
• MailerSend: Built specifically for transactional workflows, it features an intuitive email builder and a robust Template API enabling you to manage and update templates programmatically.
• Bird (formerly SparkPost): Features a visual dashboard builder alongside CLI and API capabilities to author, version, store, and push immutable email templates referenced by a slug or ID at send time.

If you are looking for a decoupled, headless visual builder component to embed directly inside your own product (so your users or team can build templates in your UI and push them to your email provider via API), developer-focused tools like Unlayer or open-source EmailBuilder.js are often integrated on the frontend and synced into the backend provider.

If you can share whether you want to push templates from an internal dashboard you are building or sync templates between staging/production environments , I can point you to the exact API endpoints or provider docs you'll need.

Yes. If you already have a transactional email provider and want a separate drag-and-drop builder that can push/export templates into your provider via API, there are several good options.

Best fits

• stripo.email — Probably the closest match. Its API lets you create/manage templates and export the resulting HTML, so you can connect the builder to your existing ESP rather than switching providers.
• beefree.io — Strong option if you want to embed the editor in your own application. Its SDK has APIs for content/template management, including a Template Catalog API.
• unlayer.com — Another embeddable email editor. It doesn't send transactional mail itself; you export the designed HTML/JSON and hand it to your existing ESP. Unlayer explicitly supports using an external provider such as SendGrid, Mailgun, Postmark, or SES.
• Mailgun's builder — If your transactional provider happens to be Mailgun, this is especially straightforward: their drag-and-drop builder stores templates and the Templates API lets you create/manage/version them programmatically.
• Customer.io — More of an all-in-one messaging platform, but its transactional system has an editor and an API for updating template HTML programmatically.

One important distinction

If by "pushes templates via API" you mean:

Designer creates template → API sends the finished template directly into our existing provider's template library then I'd shortlist Stripo or Unlayer/Beefree, depending on whether you want a standalone SaaS builder or an editor embedded in your product.

If you tell me which transactional provider you use (SendGrid, Postmark, Amazon SES, Mailgun, Resend, etc.), I can identify the builders that have a direct integration/API path to that provider and compare them.

Most major Transactional Email Providers (TEPs) feature built-in template storage and APIs that allow you to programmatically create, update, or push raw HTML/text templates directly to their servers.

If you are looking to design emails in an external tool (or your own custom admin panel) and push/sync those finished templates via API to a reliable transactional delivery stream, the following providers support this workflow:

1. Brevo (formerly Sendinblue)

Brevo has robust infrastructure split cleanly between marketing and transactional streams, with full API coverage for transactional templates.

• How it works: You can design templates via their visual editor or build them externally and use their endpoints to programmatically create or update templates.
• The API: Their Brevo API Documentation includes explicit POST /v3/smtp/templates (create) and PUT /v3/smtp/templates/{templateId} (update) endpoints where you pass raw HTML (htmlContent ) or an external URL (htmlUrl).

2. Postmark

Postmark is heavily developer-focused and offers a clean Templates API dedicated entirely to managing reusable templates.

• How it works: Postmark allows you to maintain up to 100 templates per server. While they provide a code editor inside their dashboard, their system is built to accept template definitions completely via API.
• The API: You can call POST /templates to push a new template (including HtmlBody, TextBody , and Subject ) or use PUT /templates/{templateId} to update an existing template programmatically whenever your external builder compiles a new version.

3. Twilio SendGrid

SendGrid uses Dynamic Templates which separate the design layer from your delivery payload.

• How it works: SendGrid provides a design/drag-and-drop builder in their UI, but every template and version can also be entirely managed programmatically.
• The API: Through the SendGrid API, you can programmatically create dynamic templates, add new design versions, and update the HTML content of an existing template version via their Web API v3 endpoints rather than relying solely on their dashboard UI.

4. Mailgun (by Sinch)

Mailgun offers Stored Templates which allow you to save email layouts on their servers and reference them by name when triggering a send.

• How it works: Instead of sending massive HTML blocks with every single API request, you store the template upstream.
• The API: Mailgun's Template API allows you to POST new templates and PUT updates to existing template tables, meaning an external CI/CD pipeline or custom builder can push compiled HTML straight to Mailgun's storage endpoints.

Alternative: Headless / API-First Builders

If you are looking for a dedicated visual builder decoupled entirely from an ESP—one that specifically exports/pushes content directly to your transactional provider via API—consider tools like:

• React Email / Maizzle: If your "builder" is code-based, you can compile components locally in your repo and write a small script using the provider's API (like Postmark or Brevo) to auto-sync the compiled output on deploy.
• Beefree SDK: An embeddable drag-and-drop email builder that you can host inside your own app, which outputs clean JSON/HTML that you can then pipe straight into your TEP's template creation API.

If you can share which external builder you are using (or if you are building a custom one) and which transactional provider you currently lean toward, I can give you a sample API payload or sync workflow for that exact pairing.

Third-party visual email builders and headless email CMS platforms allow you to design responsive templates via drag-and-drop and sync or push the compiled HTML/JSON directly via API to your existing transactional email service provider (like Postmark, SendGrid, Resend , or Mailgun).

Because most dedicated transactional providers offer basic code-only or clunky template editors, decoupling the design layer using a specialized third-party template builder via API is a common engineering pattern.

Dedicated Tools & Builders with Template Push APIs

If you can share which transactional email provider you are currently using (e.g., Postmark, SendGrid, Amazon SES) and whether you prefer an embedded white-label editor or a standalone design tool , I can recommend the exact integration pathway.

Yes. If you already have a transactional email provider and want a visual email builder that your app can use to push/save templates through an API, there are several good options:

• stripo.email — probably the strongest fit. Its editor can be embedded into your application, and its API lets you create/manage templates and export compiled HTML. Its plugin API also exposes getTemplate and compileEmail, so your app can take the designer's output and send/store it with your existing provider.
• unlayer.com — very good embedded-editor option. It's explicitly designed as a template builder rather than an ESP, so you can pair it with your existing transactional provider.
• mailjet.com — good if you're willing to use Mailjet as the provider. Its transactional editor stores templates, and templates can also be created through its API.
• sendgrid.com — similar provider-plus-builder approach. Its API supports creating transactional templates, but it's less attractive if you specifically want to keep your existing ESP.

What I'd shortlist

If your architecture is:

Your app → visual builder → API → your existing transactional ESP

I'd start with Stripo vs. Unlayer.

| Stripo | Unlayer --- | --- | --- Embeddable editor | ✅ | ✅ API | ✅ | ✅ Export HTML | ✅ | ✅ Designed to work with your own ESP | ✅ | ✅ Template management/API | Strong | Strong Best for | Full email workflow | Developer-friendly embedded editor

One important distinction: if by “pushes templates via API” you mean “when a marketer clicks Save, automatically create/update the corresponding template inside our existing provider (e.g. Postmark, SendGrid, Mailgun, SES, etc.)”, that's a slightly different requirement. Stripo/Unlayer provide the builder; you typically write the small integration layer that takes the generated HTML/template data and calls your ESP's template API.

If you tell me which transactional provider you use, I can identify the best builder and show exactly how the builder → provider template API flow would work.

When you say "pushes templates via API," this usually means one of two workflows:

1. Syncing/Creating templates programmatically: Your internal app or an external builder pushes raw HTML/JSON templates into the transactional provider's server via an API (so the provider stores the template, and you reference it by ID when sending).
2. Building templates visually via an embedded third-party builder (like Beefree SDK or Knak) and using an API to deploy those designs directly into your email provider's template library.

Virtually all major transactional email infrastructure providers support storing, updating, and managing templates via their REST APIs rather than forcing you to use their native dashboards.

Top transactional email providers that allow you to create, push, and manage templates programmatically via API include:

• Postmark: Widely praised for developer ergonomics and strict transactional focus. Postmark features full CRUD template endpoints (/templates, Create Template, Update Template ) allowing you to push structural HTML/text updates right from your build pipeline or custom CMS.
• Mailgun: Offers a robust Templates API that lets you store, version, and update Handlebars-backed templates via API calls without touching the web dashboard.
• SendGrid: Provides a comprehensive Dynamic Templates API that supports creating and updating template designs and versions programmatically.
• Brevo (formerly Sendinblue): Allows programmatic creation and management of transactional templates via their REST API endpoints, which you then trigger by passing a templateId and JSON parameters.
• Resend: A modern developer-first email platform that works exceptionally well with programmatic setups (including component-based frameworks like React Email), where templates can be pushed or rendered directly on every send call or via their API infrastructure.

If you are looking for an independent visual drag-and-drop builder to sit on top of these providers (so non-technical team members can design emails and push them down to your API-driven provider), tools like Beefree SDK or Stripo provide embedded editors that export/push finalized HTML directly via webhooks or APIs into your backend or ESP.

If you can clarify whether you want to push code from a custom CI/CD pipeline or plug in a visual drag-and-drop editor for users, I can recommend the exact API endpoints or partner stack for your use case.

If you mean “we already have a transactional email provider (ESP), but we want a visual email builder where non-developers edit templates and the finished HTML/template is pushed into our ESP via API”, the main options are:

A few patterns:

If you want to embed a builder inside your own product

Look first at:

These are designed so your users/admins edit templates in your UI, then your backend stores the resulting HTML/JSON and sends it through your existing provider. Stripo, for example, exposes APIs for creating/managing templates and exporting email HTML.

If you want marketing/designers to maintain transactional templates

A common stack is:

• Builder: Stripo / Beefree / Unlayer
• Template storage: your database or ESP template store
• Sending: SendGrid, Amazon SES, Mailgun, Postmark, etc.

If you use a provider like SendGrid, Mailgun, etc.

Check whether you need:

1. Template CRUD only (create/update templates via API), or
2. An embedded editor (your users design emails inside your app).

For example, Mailgun supports storing and managing templates via its Templates API, but it is more of a transactional infrastructure tool than a full embedded design environment.

If you tell me which transactional provider you use (SendGrid, SES, Postmark, Mailgun, SparkPost, etc.) and whether the builder is internal-only or customer-facing SaaS, I can narrow this down to the best matches.

If you already have a transactional email provider (SendGrid, Mailgun, SES, Postmark, Customer.io, etc.) and want a visual email builder that can push templates through an API, there are a few common choices:

A typical architecture looks like:

1. Designer creates template in builder.
2. Builder outputs HTML (often with JSON metadata).
3. Your backend stores the template ID/version.
4. Your transactional provider sends using: - provider template ID, or

• injected HTML body, or
• API-updated template content.

A few provider-specific notes:

• SendGrid: commonly paired with Unlayer/BEE/Stripo; the builder manages design, SendGrid remains the delivery layer.
• Mailgun / Postmark / SES: usually use the builder only to generate/export HTML; your app manages template storage and variables.
• Customer.io: closer to an all-in-one workflow because it already has transactional templates and API-triggered sends.
• Stripo is one of the closer matches to “design here → push/update templates via API.”

If you mean “our customers need an email builder inside our SaaS, and their designs should become transactional templates in our email provider”, I’d shortlist Unlayer, BEE Plugin, and Stripo. If you mean “our internal marketing team needs to manage transactional templates without engineering releases”, I’d look at Stripo + your ESP API or your ESP’s native template system.

Dedicated email design platforms like Stripo and Chamaileon ** offer advanced drag-and-drop email builders that can push or synchronize compiled HTML templates directly via API** to various external email service providers and custom applications.

If you are already locked into a separate, developer-focused transactional email provider (like Postmark, Amazon SES, or Resend) that lacks a visual builder, you can use specialized template builder APIs or embedded SDKs to design and push code externally.

Dedicated Email Builders with API/Export Capabilities

• Stripo API : A REST-based platform allowing you to create, manage, and programmatically export responsive HTML email templates straight to external systems and platforms.
• Chamaileon : Provides an enterprise Custom Integration API as well as a white-label SDK plugin that lets teams synchronize, upload, and update email layouts dynamically.
• *Beefree SDK * : An embeddable drag-and-drop editor that you can integrate directly into your own app, letting users build emails inside your interface and save/push the JSON/HTML output via API to your sending infrastructure.

Alternative: All-in-One Transactional Providers with Built-in Builders

If managing an external builder sync becomes too complex, some dedicated transactional platforms include visual drag-and-drop editors natively tied to their sending APIs:

• MailerSend : Built explicitly for transactional delivery while offering a robust visual builder usable by non-engineers.
• *Mailjet * : Combines a drag-and-drop template designer with robust transactional API sending libraries.
• *Waypoint * : An API-first transactional email tool featuring an integrated template builder tailored for developer workflows.

If you share which transactional email provider you currently use , I can give you the exact integration method or confirm if a direct plugin exists for your stack.