Segment, Tealium and Amperity are often compared, but they were built for different jobs, and their integration catalogs show it. CdpHub recorded every integration the three document on their public pages: 1,624 listings in all, each with its direction, how it runs where the page says, and a link to the page that describes it.
This comparison starts from those catalogs, because a catalog is a platform's own statement of what it was built to do. It then turns to the two things a catalog can't show, identity resolution and real-time processing, using each vendor's documentation.
The three catalogs side by side
| Segment | Tealium | Amperity | |
|---|---|---|---|
| Documented integrations | 555 | 886 | 183 |
| Partner tools | 459 | 636 | 113 |
| Into the platform / out of it / both | 103 / 452 / 0 | 49 / 832 / 5 | 58 / 122 / 3 |
| Client-side (tag, pixel or SDK) | 20% | 67% | 0% |
| Server-side (API, stream or file) | 80% | 30% | 92% |
| Warehouse | 3% | 2% | 7% |
| Largest categories | Analytics & BI (119), Email & Marketing Automation (95), Personalization & Testing (69) | Advertising (330), Analytics & BI (117), Email & Marketing Automation (79) | Advertising (44), Email & Marketing Automation (39), Data Infrastructure (19) |
| Of the 25 most connected tools, documents | 23 | 24 | 24 |
| Other platforms that integrate with it | 17 | 9 (13 counting Tealium iQ, its tag manager) | 3 |
A listing can run more than one way, so the three run shares can add up to more than 100 percent. "Partner tools" counts distinct products as the directory groups them. Segment names several ad-network features and product versions as separate products (TikTok Conversions, TikTok Audiences and TikTok Pixel, for example), and the directory counts those separately, so a strict count by product would put Segment roughly 25 lower.
What each catalog is built around
Tealium documents a tag manager's catalog. 594 of its 886 listings run client-side, nearly all of them vendor tags, and 222 of those are for advertising. Its 832 outbound listings are the most of any platform in the directory, and 376 of its 636 tools appear on no other platform. That long tail of vendor pixels it can deploy and govern is what sets the catalog apart. On the server side, 249 listings send data out from Tealium's servers, most of them connectors that act on event and visitor data from EventStream and AudienceStream.
Segment documents an event router's catalog. 449 of its 555 listings run server-side and 116 client-side. Analytics & BI is its largest category, ahead of Email & Marketing Automation and Personalization & Testing: the catalog is built to send one event stream to many analytics and engagement tools. Other vendors connect to Segment more than to the other two: 17 of the directory's other platforms document an integration with it, against 9 for Tealium (13 counting its Tealium iQ tag manager) and 3 for Amperity.
Amperity documents a round-trip catalog. None of its 183 listings runs in the browser: all are server-side or warehouse. 48 of its 113 tools have documented flows in both directions, against about one in nine of Segment's tools and one in 23 of Tealium's. Amperity pulls data from systems such as Salesforce, Zendesk, Attentive and Klaviyo and sends audiences, attributes or profile updates back to the same tools. The catalog is small but mainstream: only 16 of its tools appear on no other platform, and it documents 24 of the directory's 25 most connected tools.
Where the catalogs meet
The common core is close to complete on all three. Of the 25 tools in the CDP Market Landscape report's most-connected chart (Meta, Google Ads, Snowflake, Amazon S3, BigQuery, HubSpot, Salesforce, Shopify, TikTok and the rest), Segment documents 23, and Tealium and Amperity 24 each. The gaps are specific: Segment has no Azure Blob Storage or SFTP listing, Tealium none for Zendesk, Amperity none for Google Tag Manager. Beyond that core the catalogs diverge, and that divergence is where the three products differ.
Warehouses are now a two-way street on all three.
- Segment loads event data into seven warehouses as storage destinations and also sends data to Amazon S3, Google Cloud Storage (in beta) and SingleStore. It reads back in two ways: Reverse ETL from seven warehouses (Snowflake, BigQuery, Databricks, Redshift, Postgres, Azure Synapse and IBM Db2), and the Data Graph on four (Snowflake, BigQuery, Databricks and Redshift), which feeds Linked Audiences and Linked Events. Some of these are still pre-release: Db2 Reverse ETL is in private beta, and Segment marks its Snowflake Reverse ETL and BigQuery Data Graph pages as in active development.
- Tealium reads tables from Snowflake, BigQuery, Databricks and Redshift as cloud data sources, with Databricks Delta Sharing and Trino in early access. Its connectors stream or load event and visitor data into Snowflake, BigQuery, Redshift, Databricks and Microsoft Fabric, and its Audience Discovery app builds audiences inside Snowflake.
- Amperity shares data both ways with Snowflake, Databricks and BigQuery through Amperity Bridge, using each warehouse's own sharing feature instead of file copies. Its other warehouse paths move files: it pulls from Amazon S3, Azure Blob Storage, Google Cloud Storage and, in beta, Microsoft Fabric, and loads into Redshift, Azure Synapse and BigQuery through cloud storage.
What the catalog doesn't show: identity and real time
Integration listings say where data can go, not how a platform decides that two records are the same person. For that, the vendors' own documentation is the source.
- Segment: Identity Resolution is part of Unify (formerly Profiles), an add-on to the Business tier that comes with Engage. It merges identifiers into one profile by rules you set for which external IDs must be unique and which IDs and sources can link profiles, protects against bad merges, and works in real time.
- Tealium: AudienceStream CDP builds visitor profiles from the event data flowing through EventStream. Visitor stitching joins profiles when an identifier such as a hashed email or customer ID fills a visitor ID attribute. It happens in real time, can't be reversed once done, and Tealium turns it on for each account and profile on request.
- Amperity: Stitch compares pairs of customer records with machine-learning models and Amperity's patented algorithms, combining deterministic, probabilistic and transitive matches under one Amperity ID. Stitch runs as a full identity-resolution job, and Amperity also documents real-time identity recognition that attaches new events to known profiles.
The practical difference: Segment and Tealium resolve identity on identifiers you send, in real time. Amperity is the only one of the three whose own identity resolution includes probabilistic matching, which Amperity describes as approximate matching on customer keys and profile fields. (Tealium documents a beta route for bringing in probabilistic identity data from Acxiom, a partner.)
Best fit, by the data
| If your priority is | Best fit | What the data shows |
|---|---|---|
| Deploying and governing vendor tags and pixels | Tealium | 594 client-side listings, nearly all tags, and 376 tools no other platform documents |
| Routing one event stream to many analytics and engagement tools | Segment | 449 server-side listings, Analytics & BI its largest category, 17 platforms integrate with it |
| Unifying fragmented customer records from many systems | Amperity | Machine-learning Stitch with probabilistic matching, 48 tools with flows both ways |
| Real-time audiences on top of tag management | Tealium | Real-time visitor stitching in AudienceStream, 832 outbound listings |
| Activating data that lives in your warehouse | Compare all three | Segment Reverse ETL (7 warehouses) and Data Graph (4), Tealium cloud data sources (4), Amperity Bridge (3, both ways) |
The bottom line
These three platforms are not interchangeable, and their catalogs say so plainly. Tealium is the strongest fit when the job starts in the browser: the most tags, the longest tail and real-time stitching behind them. Segment fits engineering-led teams that want one clean event stream delivered to many tools, and more vendors integrate with it than with Tealium or Amperity. Amperity fits brands whose problem is identity: messy records across retail, e-commerce and service systems, resolved with probabilistic matching and synced back to the tools that sent them.
All three now read from and write to the warehouse, so "warehouse support" no longer separates them. Check instead whether each documents the specific tools in your stack, in the direction you need. The CdpHub directory lists every integration above with a link to the vendor's page.
How we count
- Counts are every integration with a third-party tool that each platform documents on a public page, as of October 2026. The platform's own SDKs, libraries, APIs and features are not counted.
- Run types: client-side means a tag, pixel, SDK or plugin in the site or app carries the data; server-side means the platform's servers exchange data by API, webhook, stream or file; warehouse means the tool is a warehouse, lake, bucket or database, or the integration is reverse ETL or data sharing.
- The 25 most connected tools are the ones the CDP Market Landscape 2026 report's chart shows as documented by the most of the directory's 44 platforms. Counts change as catalogs change; the live directory is the reference.
Sources
- Segment: Unify overview, Identity Resolution overview, Data Graph, Reverse ETL
- Tealium: Introduction to AudienceStream, About visitor stitching
- Amperity: How Stitch works, Identity resolution summary
- Integration counts: the CdpHub directory, which links each listing to the vendor page it came from.
