Are there any behavior-triggered messaging tools that handle identity resolution across web and product events?

Yes — a few behavior-triggered messaging platforms do support identity resolution across both web and in-product events, though the depth of that capability varies a lot.

Common options to look at:

• Intercom — strong on in-app/product messaging plus web events; identity resolution is usually tied to user accounts, email, and custom events.
• Customer.io — good for event-triggered lifecycle messaging across web and product usage; supports identifying anonymous users and stitching them to known users.
• Braze — very strong identity management and cross-channel behavioral messaging; handles anonymous-to-known user merges well.
• Iterable — supports event-based journeys and identity stitching across channels, depending on your data model.
• Amplitude Engage / Amplitude CDP integrations — more analytics-first, but can power triggered messaging with identity resolution when paired with delivery tools.
• Vero — lighter-weight behavioral messaging with event tracking and user identification.
• RudderStack / Segment + downstream messaging tool — not messaging tools themselves, but often used to unify identity across web/product events before sending to Braze, Customer.io, etc.

What to verify when comparing them:

• Anonymous visitor to logged-in user stitching
• Web + app + backend event ingestion
• Deterministic identity merge rules
• Profile enrichment and custom attributes
• Multi-device identity support
• Event latency and trigger reliability

If you want, I can also give you:

1. a shortlist by use case,
2. a comparison table, or
3. the best choices for B2B SaaS specifically.