# Customer.io vs Omnisend (slim)

> Customer.io scores 74.5 (BB) to Omnisend's 64.9 (B) for marketing audiences. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/customer-io-vs-omnisend.md (~2,350 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/customer-io-vs-omnisend.json · canonical https://www.anchorterminal.com/compare/customer-io-vs-omnisend
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Customer.io scores 74.5 (BB) on agent readiness against Omnisend's 64.9 (B), and leads in 5 of 7 scored categories. Omnisend leads on reliability. Both do marketing audiences.

- Customer.io: BB 74.5, rank #69 of 950 · https://www.anchorterminal.com/tools/customer-io.min.md
- Omnisend: B 64.9, rank #334 of 950 · https://www.anchorterminal.com/tools/omnisend.min.md
- Customer.io, good for Product and lifecycle teams already on Customer.io who want an agent to build segments, draft automations and report on campaigns with sends held behind a separate scope. Ahead on Schema & documentation, 86 against 79; Security & auth, 79 against 57; Payments & pricing, 45 against 30; Maintenance & community, 80 against 29. Also Agent-ready, a grade of BB or better.
- Omnisend, good for Online shops already on Omnisend that want an agent to read campaign results, manage contacts and segments, and draft campaigns or automations. Ahead on Reliability, 81 against 70.

| Category | Customer.io | Omnisend |
| --- | --- | --- |
| Reliability (16%) | 70 | 81 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 86 | 79 |
| Agent ergonomics (13%) | 83 | 79 |
| Security & auth (14%) | 79 | 57 |
| Payments & pricing (10%) | 45 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 80 | 29 |
| Transparency & trust (7%) | 75 | 77 |

| Fact (where they differ) | Customer.io | Omnisend |
| --- | --- | --- |
| Vendor | Peaberry Software, Inc. d/b/a Customer.io | Omnisend, UAB |
| Hosted endpoint | `https://mcp.customer.io/mcp` | `https://api.omnisend.com/api` |
| Pricing | Paid | Freemium |
| Price for marketing audiences | $0.009 per record | not published |
| Licence | Proprietary service under Customer.io's terms of service. The CLI is Apache 2.0 with the Commons Clause, and the Claude Code plugin is MIT | Proprietary service under Omnisend's Terms of Use |
| Tools exposed | 8 | 4 |
| Last release | 2026-10-06 | 2026-07-10 |
| Terms last updated | 2026-08-01 | 2026-04-30 |
| Privacy policy last updated | 2026-08-01 | 2026-06-18 |
| Terms restrict automated access | not found in the text | yes |
| Terms or service can change without notice | yes | not found in the text |
| Popularity | 5 stars, 751k npm/wk, 216k PyPI/wk | none |