What's the best tag manager for tracking user actions across a single-page app without breaking event consistency?

For a single-page app, the best choice is usually Google Tag Manager (GTM) — if you set it up correctly with a data layer and SPA route tracking.

Why GTM is a strong fit

• Handles SPA navigation well when you manually push route-change events to the data layer
• Flexible for analytics, ads, and custom event tracking in one place
• Widely supported with lots of documentation and community examples
• Works without hard page reloads, which is the main challenge in SPAs

The key to avoiding broken event consistency

A tag manager alone won’t guarantee consistency. The important part is:

1. Use a data layer
2. Push explicit events for user actions and route changes
3. Avoid relying only on automatic pageview triggers
4. Standardize event names and payloads

Example approach:

• page_view when route changes
• click_button for button clicks
• form_submit for form events
• include stable fields like:
  • page_path
  • route_name
  • user_id or anonymous_id
  • event_id for deduplication if needed

When another tool may be better

Consider alternatives if you want:

• More product analytics focus: Segment, RudderStack, PostHog
• Less marketing complexity, more observability: PostHog
• Server-side/event pipeline control: Segment or RudderStack

Short recommendation

• Best general-purpose tag manager for an SPA: Google Tag Manager
• Best practice: pair it with a carefully designed data layer
• If you want analytics-first instead of tag-management-first: consider PostHog or Segment

If you want, I can also give you a recommended SPA tracking setup for GTM, including the exact events and data layer structure.