Integrations
Braze + Segment + Amplitude: who talks to whom, and in which direction
This stack fails in the diagram stage: teams wire 'Braze and Amplitude' without deciding which of the three documented connections they mean, then wonder why sessions look wrong through Segment. Here's the wiring with directions labeled.
Braze ↔ Amplitude: three connections, not one
| Connection | Direction | What the docs say it does |
|---|---|---|
| Braze (Cohort Sync) | Amplitude → Braze | Sends Amplitude cohorts to Braze, where they appear as segment filters ('Amplitude Cohorts'); one-time, scheduled, or real-time sync modes. |
| Braze event streaming | Amplitude → Braze | Forwards Amplitude events and users to Braze, with a Send Users option for user/property updates. |
| Braze Currents source | Braze → Amplitude | Sends Braze marketing-engagement events (sends, opens, clicks) into Amplitude; requires external_user_id or device_id so events attach to the right person. |
All three from the Amplitude source/destination catalogs (Sources). The classic loop: behavioral cohort out via sync, campaign engagement back via Currents - closing the 'did the campaign change behavior' question inside Amplitude.
Where does Segment fit - and where does it bite?
Segment's Amplitude destination accepts Page, Group, Identify, and Track calls across browser, iOS, Android, and server components - the standard CDP-as-source pattern, and Amplitude's own Segment source docs describe the client-side variant where Segment's library delegates collection to Amplitude's bundled SDK.
The nuance that bites, quoted from Segment's docs: Segment doesn't have a concept for a session. Device-mode calls include session information because Amplitude's SDK is bundled; cloud-mode calls need session_id set explicitly as an integration-specific option - or your session-based charts (and session replay stitching) quietly fragment. Device IDs differ by mode too: bundled device-mode lets Amplitude generate them, server-side falls back from context.device.id to the anonymousId.
Field rule (ours): decide device-mode vs cloud-mode per platform BEFORE launch, and put the session_id decision in the tracking plan. It is a one-line option that decides whether 'sessions' means anything.
The identity thread through all of it
Every wire above rides the same identifiers: Braze Currents needs your external_user_id to match Amplitude's user_id; Segment's ID choices become Amplitude's device_id story. If those IDs aren't the same stable internal identifier everywhere, each integration multiplies the fragmentation - see our identity resolution guide for how Amplitude merges (and permanently refuses to merge) IDs.
Sources
- Amplitude docs: Braze cohort sync destination
- Amplitude docs: Braze event streaming destination
- Amplitude docs: Braze Currents source
- Segment docs: Amplitude destination (session & device-ID behavior)
- Amplitude docs: Segment source
Product capabilities change - every claim above links to the primary source it came from. Judgment calls and field observations are ours and labeled in-line.
Frequently asked questions
How do I send Amplitude cohorts to Braze?+
Through the documented Braze (Cohort Sync) destination: connect it, pick the cohort, and choose one-time, scheduled, or real-time sync. The cohort then appears in Braze as a segment filter under 'Amplitude Cohorts', ready for campaign targeting.
Why do my Amplitude sessions look wrong when events come through Segment?+
Almost always the mode: Segment has no session concept of its own. Device-mode (bundled SDK) carries Amplitude session information automatically; cloud-mode does not unless you explicitly set session_id as an integration-specific option - per Segment's own docs. Fix the option, or move the affected platform to device-mode.
Can Braze campaign events show up inside Amplitude?+
Yes - the Braze Currents source streams marketing-engagement events into Amplitude, provided each event carries an external_user_id or device_id that matches your Amplitude identifiers. That's the wire that lets you measure campaign impact on retention inside your product analytics.
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