Integration Infrastructure Comparison

Ampersand vs HotGlue: Integration Infrastructure vs Embedded ETL

Ampersand is the native integration infrastructure for AI agents: real-time, bi-directional product integrations with direct API access. HotGlue is embedded ETL — it ingests your customers' SaaS and file data into your database or warehouse. Here's how to tell which one your team actually needs.

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Where Ampersand wins

The advantages that matter when your integration powers in-product UX, not offline data analysis.

  • True bi-directional sync

    Ampersand reads from and writes to your customer's systems. Create tasks in their CRM, update opportunities, post notes, attach files: all from inside your product. HotGlue is built to ingest data out of customer systems into your storage layer.

  • Sub-second real-time sync

    Ampersand's event-driven architecture delivers webhook notifications in under one second. HotGlue is scheduled batch ETL.

  • Embeddable customer UI

    Ampersand ships white-labeled React components for auth, field mapping, and sync settings. Your customer configures their own integration inside your product, no custom UI work required. HotGlue's embedded widget is primarily for authorization, not customer self-serve configuration.

  • Full custom object support

    Ampersand supports reading and writing any object or field, standard or custom, on every tier. Custom objects are where enterprise deals actually live. HotGlue can ingest custom objects, but there's no bi-directional path back into those objects for product actions.

  • Integrations as code

    Ampersand integrations are defined in amp.yaml files that live in your repo, go through PR review, and ship with your CI/CD. HotGlue's tap/target configuration lives in an outside dashboard.

  • Built for AI agents

    Ampersand's open-source AI SDK exposes integrations as tools that LLMs can invoke. The Docs MCP lets Claude Code and Cursor spin up integrations in minutes. HotGlue has no native agent tooling — it's a data pipeline, not an action layer.

What Customers Say

"Using Ampersand, we cut Julian's response time from 60 seconds to 5."
Muizz Matemilola, Engineering — 11x
"We chose Ampersand because we want to build an integration that we don't need to rebuild, and we want to meaningfully accelerate our upmarket journey."
Kshitij Grover, CTO — Orb
"Ampersand is the first developer platform that gets it right."
Eric Engoron, Engineering — Clay
"Ampersand is core to how we grow."
John Peña, CTO — Hatch (acq. by Yelp)
"Ampersand is helping Square connect to more upmarket Sellers, driving strong revenue growth."
Max Friz, Partnerships Lead — Square

When to Choose Each Platform

We believe in being honest. These tools solve different problems — most teams will eventually want both.

Choose HotGlue When You Need…

  • To ingest your customers' SaaS and file data into your database
  • Batch ETL pipelines feeding analytics, reports, or ML training
  • Read-only access to many data sources in a normalized target schema
  • A Singer/tap-based architecture with familiar tooling
  • A data-team-owned ingestion layer for your product

Choose Ampersand When You Need…

  • Bi-directional reads and writes into customer CRM/ERP
  • Real-time, sub-second data for AI agents or voice products
  • Per-customer OAuth, field mappings, and embeddable UI
  • Custom objects and fields on every tier
  • An integration that drives in-product UX, not offline analysis
  • Integrations versioned in Git and shipped with your code
  • Credential ownership and zero vendor lock-in

Frequently Asked Questions

  • Isn't HotGlue built for SaaS products?

    Yes, specifically for SaaS products that need to ingest their customers' data. HotGlue is an embedded ETL layer: it pulls data from customer SaaS, files, and databases and lands it in your storage so your product can analyze it. That's a real and useful use case. But if your product also needs to write back into those customer systems (create tasks, update records, push notes), HotGlue isn't designed for that. Ampersand is.

  • Can I use both?

    Yes, some teams use a data-ingestion layer for analytics pipelines and a product-integration platform for bi-directional in-product UX. The two serve different use cases owned by different teams (data engineering vs product engineering).

  • What does sub-second sync unlock?

    Ampersand's event-driven architecture delivers webhook notifications in under one second. That's the difference between an AI voice agent that feels real-time and one that pauses awkwardly while a batch job waits to run.

  • Does Ampersand support custom objects?

    Yes, on every tier. You can read and write custom objects and custom fields in Salesforce, HubSpot, NetSuite, Dynamics, and more without workarounds. Ampersand treats custom objects as first-class.

  • Is Ampersand suitable for AI and agentic use cases?

    Yes. Ampersand's open-source AI SDK exposes integrations as tools LLMs can invoke. The Docs MCP lets AI coding agents generate integration configs in minutes. Declarative YAML is machine-readable and machine-writable.

Need More Than Data Ingestion?

If your product has to write back into customer systems — update records, create tasks, push notes — you need a bi-directional product integration platform. That's Ampersand.

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