Heard: native analytics vs third-party — they measure different reach

Heard: native analytics vs third-party — they measure different reach
Confirmed: X's native analytics counts impressions including the 'For You' algorithmic surface; many third-party tools historically estimate from follower reach only.
Rumored: as of recent API changes, some external dashboards under-report impressions by 20-40% because they lost access to the full impression field.
Which to trust for what:
— Native: source of truth for impressions, profile clicks, the engagement-to-impression ratio
— Third-party (Blackmagic, etc.): better for trend lines, posting-time heatmaps, follower cohort analysis
What it means for your reach: report from native, optimize patterns with the external tool. Don't make decisions on third-party impression counts.