# Redox vs Zus Health

> Redox scores 58.3 (C) to Zus Health's 56.6 (C) for ehr integration. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/redox-vs-zus-health
- Markdown: https://www.anchorterminal.com/compare/redox-vs-zus-health.md (~2,200 tokens)
- Slim: https://www.anchorterminal.com/compare/redox-vs-zus-health.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/redox-vs-zus-health.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-14

Redox scores 58.3 (C) on agent readiness against Zus Health's 56.6 (C), and leads in 3 of 7 scored categories. Zus Health leads on schema & documentation, agent ergonomics and maintenance & community. Both do ehr integration.

- Redox: grade C, 58.3/100, rank #618 of 1076. Markdown https://www.anchorterminal.com/tools/redox.md · JSON https://www.anchorterminal.com/api/v1/tools/redox.json
- Zus Health: grade C, 56.6/100, rank #669 of 1076. Markdown https://www.anchorterminal.com/tools/zus-health.md · JSON https://www.anchorterminal.com/api/v1/tools/zus-health.json
- Best health record and wellness data APIs for AI agents: https://www.anchorterminal.com/best/health-data/index.md
- All 63 health comparisons: https://www.anchorterminal.com/compare/health-data/index.md

## Which one, for what

### Redox (C)

Good for: Health software vendors integrating with many hospital EHRs and networks, and integration teams who want an agent to manage Redox configuration.

Ahead on:
- Reliability, 85 against 66
- Security & auth, 78 against 49
- Payments & pricing, 15 against 5

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: The MCP server loads 107 tools in one set, including write and delete tools with no confirmation step

### Zus Health (C)

Good for: US care organisations and digital health builders that want a shared, continuously refreshed patient profile in FHIR with EHR embedding.

Ahead on:
- Schema & documentation, 77 against 56
- Agent ergonomics, 67 against 54
- Maintenance & community, 64 against 31

Watch for: No public prices, and the sandbox is requested through a Google Form


## Score by category

| Category | Weight | Redox | Zus Health | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 85 | 66 | Redox +19 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 56 | 77 | Zus Health +21 |
| Agent ergonomics | 13% (16.2 this run) | 54 | 67 | Zus Health +13 |
| Security & auth | 14% (17.5 this run) | 78 | 49 | Redox +29 |
| Payments & pricing | 10% (12.5 this run) | 15 | 5 | Redox +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 31 | 64 | Zus Health +33 |
| Transparency & trust | 7% (8.8 this run) | 59 | 59 | even |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **58.3 · C** | **56.6 · C** | |

## Facts side by side

| Fact | Redox | Zus Health |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Redox, Inc. | Zus Health, Inc. |
| Hosted endpoint | `https://api.redoxengine.com/mcp` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | OAuth | OAuth |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Proprietary service under Redox's Cloud Services Agreement, EULA and SLA (version 2016.1) | Proprietary service under the Zus Builder Terms of Service (last updated 11 March 2025), the Developer Sandbox Terms and the Zus Business Associate Addendum |
| Tools exposed | 107 | none |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | none | 2026-10-14 |
| Terms last updated | 2015-10-17 | 2025-03-11 |
| Privacy policy last updated | 2023-01-18 | 2026-06-24 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |

## Verdicts

**Redox.** Redox connects to EHRs and clinical networks behind a FHIR API, with signed-JWT OAuth keys, a 99.95 per cent SLA, a HackerOne bug bounty and a hosted MCP server for managing integrations. The MCP server exposes 107 tools at once with write and delete tools unconfirmed, OpenAPI files sit behind login, and the sandbox plan costs $15,000 a year.

**Zus Health.** FHIR R4 over an aggregated patient profile drawn from CommonWell, Carequality, Surescripts, Quest and ADT networks, with published rate limits, a 99.5 per cent SLA and a dated changelog. Accounts and sandboxes are provisioned by Zus on request, with no public prices, no named security certification and no SDK.

## Before you call either

### Redox

1. Name the environment in every MCP prompt and try configuration changes in staging first, as Redox advises
2. Stay under 7,500 requests per IP per five minutes, and back off exponentially on 5XX
3. Sign the token request with the private key whose public key is registered on the OAuth API key
4. Ask an organisation owner to enable the MCP server before connecting a client
5. Treat log payloads returned through MCP as PHI and as untrusted text

### Zus Health

1. Cache the access token for its hour. More than 200 token requests an hour per App Client returns 429
2. Request Patient History at most once per patient per 24 hours, and poll the job status endpoint
3. Use conditional create by identifier so a retried write doesn't duplicate a resource
4. Send `Zus-If-Match` with the resource's ETag on PUT and PATCH
5. Set `_count` up to 500 on searches, since the default page is 10

## Questions

### Which is better for AI agents, Redox or Zus Health?

Redox scores 58.3 (C) on agent readiness against Zus Health's 56.6 (C), and leads in 3 of 7 scored categories. Zus Health leads on schema & documentation, agent ergonomics and maintenance & community.

### Do Redox and Zus Health need an API key?

Both use an OAuth sign-in.

### Can an agent call Redox and Zus Health without installing anything?

Redox has a hosted endpoint at https://api.redoxengine.com/mcp. No hosted endpoint is listed for Zus Health.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/redox-vs-zus-health.json, and with the fewest tokens: https://www.anchorterminal.com/compare/redox-vs-zus-health.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "redox", "b": "zus-health"}`. From a terminal: `anchor compare redox zus-health`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/redox.json and https://www.anchorterminal.com/api/v1/tools/zus-health.json

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