Customer.io as a subprocessor: 4 vendors that use it (September 2026)
4 vendors in the directory name Customer.io on their published subprocessor list, read from each vendor's own page and re-checked daily.
Vendors that use Customer.io (September 2026)
| # | Vendor | Uses it for | Location | First seen |
|---|---|---|---|---|
| 1 | Fly.io | Newsletters and transactional email | United States | September 26, 2026 |
| 2 | Gorgias | Customer communication | United States | September 26, 2026 |
| 3 | Metabase | Email communications. | United States | September 26, 2026 |
| 4 | Notion | Transactional, broadcast, and marketing messaging. | USA | September 26, 2026 |
First seen: the first check of the vendor's list that named Customer.io.
Know the day one of your vendors adds Customer.io
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Customer.io as a subprocessor: FAQ
- Which vendors use Customer.io as a subprocessor?
- 4 vendors in the ClauseTrail directory list Customer.io as a subprocessor: Fly.io, Gorgias, Metabase, and Notion.
- How is this list kept up to date?
- ClauseTrail reads each vendor's published subprocessor list every day. A vendor appears here while its latest list names Customer.io, and moves to "No longer listed by" when a later list drops it.