Flowlines vs Arize.
Flowlines reads from Arize rather than replacing it. Arize is broad ML/LLM observability with tracing, evals, and metrics; Flowlines is focused behavioral observability that adds cross-session signals, behavioral cohorts, and prompt-version impact on top of the OTEL traces Arize already collects.
Arize (and Phoenix) is a broad observability platform for ML and LLM systems: tracing, evaluation, drift on embeddings/metrics, and dashboards. It's deep and general-purpose.
Flowlines is narrow and behavioral. It reads OTEL traces (the same ones Arize ingests) and concentrates on agent behavior across sessions: named behavioral signals, happy/at-risk/churning cohorts, per-user Power Score, and before/after impact for every prompt version. If you run Arize, Flowlines connects to the same OTEL source.
Arize is the broad platform; Flowlines is the opinionated behavioral layer for agents specifically. They share the same OTEL traces, so adding Flowlines is a read connection, not a re-instrumentation.