A visual workspace for your team
Design messages and forms with reusable blocks. See the Slack preview as you build, without burying every copy change in your application code.
The building engine for Slack
Slack is great.
Building for it should be, too.
Design visually. Bring your data. Make it interactive.
LithoBlocks brings the builder, the engine, and the delivery tools together—so you can focus on the experience.
Visual builderDynamic templatesForms & actionsAPI & MCP
From notification to conversation
Interactive example · Try it A message that moves work forward.
release-review Slack preview
Connected by LithoBlocks
- 01Start with an action.
A button gives the team a useful next step.
- 02Keep the context.
Open a form with the release already attached.
- 03Send data. Update Slack.
Send the response to your service via webhook and update the original message.
Webhook · Example delivery Received by your service
The submitted note travels with the release context.
- Release
- REL-024
- Submitted by
- Alex Morgan
- Requested change
- Add a screenshot of the new search experience.
Slack message updated, too.
Build the template. Keep the preview in sight.
Compose your message with reusable blocks while the rendered Slack experience stays alongside it.
A reusable structure. A different result every time.
Use sample data to see how your placeholders become real content before you send.
One submission. Data to your service. An update in Slack.
Current product · September 2026 Connect form submissions to your webhook to send the answers and release context to your service, and update the original message so the team stays in the loop. Try it above.
More than a message builder.
The engine behind
your Slack experience.
Slack gives you the building blocks. LithoBlocks brings them together in a product your whole team can build with.
An engine for dynamic content
Turn structured data into rich Slack experiences with placeholders, conditions, repeating content and tables. Reuse one template across your workflows.
Interactions that do real work
Connect buttons to webhooks, open forms, and update the original message as someone responds. Keep the selected item in context through the next action.
Delivery that fits the experience
Send immediately, schedule a reminder, or combine events into a digest. Choose the delivery pattern that makes sense for what you’re building.
Built for your stack
Your data in.
A better experience out.
LithoBlocks holds the template and handles the rendering. Your application sends the data. Your team can improve the experience without rewriting the integration.
VERSION / VALIDATE / COMPILE / SEND
Create and version templates programmatically. Validate your authoring with free diagnostics, then compile or deliver through metered operations.
your-backend.js REST API
// On your server; replace the sample IDs.
const response = await fetch(
'https://api.lithoblocks.com/v1/templates/send',
{
method: 'POST',
headers: {
Authorization: `Bearer ${process.env.LB_API_KEY}`,
'Content-Type': 'application/json'
},
body: JSON.stringify({
template_id: '11111111-1111-4111-8111-111111111111',
channel_id: 'C0123456',
data: { count: 14 }
})
}
);
if (!response.ok) throw new Error(await response.text());Replace the example IDs with your template and destination. Keep API keys on your server.
One connected product
From authoring to the next actionBuild it once.
Keep making it better.
Bring design, development and operations into the same workflow.
Reusable. Versioned. Yours.
Share templates across your team, inspect versions, and keep changes under your control.
Explore templates →Work with your assistant.
Use MCP to discover, author and validate templates, with access tied to your permissions.
Meet the MCP integration →See what happened.
Follow message usage, delivery attempts, interactions and webhook outcomes from the dashboard.
Explore the interaction loop →Build the next step
Make every
interaction useful.
Give your team a form that collects the right details. Design the input, preview the experience, and keep it connected to the work.
Open LithoBlocks ↗The form builder Current product · Sample data
Plans that grow with you
Pricing & credit estimator →A platform to build on.
A plan that fits.
Choose a shared credit allowance for your organization, with clear usage rates for each operation.
Builder
$20 / month
500 monthly credits →Team$50 / month
1,000 monthly credits →Business$250 / month
10,000 monthly credits →Credits cover rendering and delivery operations. Scheduled sends, bulk sends and digests have distinct charging rules. Understand usage →
Slack + LithoBlocks
Build something great with Slack.
The visual workspace and engine for your next Slack experience.