Google Cloud's Text Moderation bills per unit of characters — a cost that grows with every message. Filter8's marginal cost is compute, so it stays flat as you scale, runs sub-millisecond, and keeps nothing after the response. (This is the paid Cloud NL classifier — not the free Perspective API, which is being retired.)
A per-character-block price looks trivial on a demo and compounds at scale — it's multiplied by every message, and longer messages cost more. A single core sustains tens of thousands of messages per second, so volume that runs into five or six figures a month on a per-call API is a rounding error in compute for a deterministic core.
Note the migration context too: the free option many teams used — Perspective — is being retired, which is what pushes teams toward paid hosted classifiers like this one. A deterministic, flat-cost core is both cheaper and more durable than swapping one per-call vendor for another.
Google Cloud Natural Language brings broad multilingual ML and deep GCP ecosystem integration, managed and maintained by Google. If you're all-in on Google Cloud and need multilingual nuance or the wider NL toolkit (entities, syntax, sentiment), it's a natural fit. Filter8 is deliberately narrow: the fastest, cheapest, most private path for high-volume text moderation, and it escalates the ambiguous tail to a model when you want that nuance.
No per-character meter to ration against. 100 free calls, no card.