---
title: "Marketplace and add-ons"
section: "Builder Guide"
canonical_url: "https://support.buildwithhq.com/builder-guide/marketplace.html"
reviewed_at: "2026-09-14"
authority: Official
---

# Marketplace and add-ons

Install extensions into your apps — from single components to complete bundles.

## In brief

- **Audience:** Builders
- **Time:** Varies by add-on
- **Billing:** Per add-on

The marketplace offers add-ons that extend your applications: components, template packs, and container-based services that run alongside your app. Products install as single items or as bundles whose components install in a defined order.

## Installing

Pick a product, review what it includes and what it costs, and install into a chosen app. Bundles show each included component and whether it's required or optional.

## Container-based add-ons

Some add-ons run as isolated services with their own compute. These are held to a strict disclosure standard: every access they make to your tenant data is written to a tamper-evident ledger your customers can verify. What an add-on runs is frozen and fingerprinted at the moment it's invoked, so the audit trail reflects exactly the code that touched the data.

Note

Add-ons never get blanket access to your data. Their network reach is sealed or allow-listed, and their data access is logged in a ledger that cannot be silently edited after the fact.

For the full model — declared endpoints, egress policies, immutable versions, and fingerprints — see [Appliances and their endpoints](appliances-and-endpoints.html). And if you've built something worth selling yourself, the [Selling Templates](../selling/index.html)  section covers the other side of the counter.

---

Capability review: 2026-09-14. [View the canonical guide](https://support.buildwithhq.com/builder-guide/marketplace.html).