Mosaico
Mosaico: A free, developer-oriented editor for building responsive HTML email templates. Ranked #48 of 63 in Email Design Software by our editors (4.0/10); pricing: Free plan; best for developers seeking a basic open-source editor.
At a glance
- Editor score4.0 / 10
- PricingFree plan
- Best forDevelopers seeking a basic open-source editor
- Free planYes
- Paid fromFree
- Editor typeDrag-and-drop
- Founded2015 · Italy
- Facts checked20 Sep 2026
Where it wins
- Free and open source with web and self-hosted options
- Responsive drag-and-drop editing with reusable templates
- Custom templates, image resizing, undo/redo and test emails
Where it doesn't
- No documented integrations with other platforms
- Advanced workflow features are not included
- Verified HTML export is not available
Our verdict on Mosaico
Mosaico is an open-source JavaScript library and web-based editor for creating responsive HTML emails. It is aimed at developers who want to embed an email builder in their own applications, customize reusable layouts, or run the editor themselves. The drag-and-drop interface works with content blocks, editable text and images, block cloning, movement and removal, and style controls for colors, fonts, sizes and buttons. A hosted website provides a live demo, while self-hosting instructions and source code under the GPL license support developer-led deployment.
The editor’s strongest area is template construction. Mosaico supports template-driven customization and lets developers create custom templates with its template language. Image uploads include automatic resizing, and global undo and redo help manage changes during editing. Responsive email template editing, test-email sending and reusable blocks make the product suitable for teams that need a focused authoring layer rather than a broader campaign system. Its free, open-source model also avoids a conventional paid-plan comparison: the published product description presents Mosaico as a library with a hosted demo and self-hosting path.
Mosaico is a narrower choice than a full email marketing platform. The documented feature set focuses on editing and template development, without integrations, advanced workflow features or verified HTML export. There are also no AI features. Choose it when developer control, source availability and custom deployment matter more than an integrated ecosystem. Teams seeking connected campaign workflows, broader platform integrations or a confirmed export workflow should choose another email design tool.
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Mosaico pricing
Mosaico fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Editor type | Drag-and-drop |
| Reusable content blocks | Not verified |
| HTML export | Not verified |
| Custom code editing | Not verified |
| Custom fonts | Not verified |
| Included editor seats | Not verified |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Support | Email, Tickets, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | mosaico.io |
| Facts checked | 20 Sep 2026 |
Alternatives to Mosaico
- StripoA flexible email design workspace with broad ESP exports and collaborative editing.8.9
- Beefree (now RGE Studio)A flexible web-based design layer for email teams that need reusable workflows and HTML control.8.8
- StensulA governed email production platform for enterprise teams managing complex campaign workflows.8.7
See all Mosaico alternatives →
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Mosaico is listed in our Email Design Software directory. Add the badge to your site — it links back to this page.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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