# Aidbox vs Zus Health

> Aidbox scores 64.2 (B) to Zus Health's 56.6 (C) for fhir servers. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/aidbox-vs-zus-health
- Markdown: https://www.anchorterminal.com/compare/aidbox-vs-zus-health.md (~2,200 tokens)
- Slim: https://www.anchorterminal.com/compare/aidbox-vs-zus-health.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/aidbox-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

Aidbox scores 64.2 (B) on agent readiness against Zus Health's 56.6 (C), and leads in 4 of 7 scored categories. Zus Health leads on reliability and transparency & trust. Both do fhir servers.

- Aidbox: grade B, 64.2/100, rank #385 of 1076. Markdown https://www.anchorterminal.com/tools/aidbox.md · JSON https://www.anchorterminal.com/api/v1/tools/aidbox.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

### Aidbox (B)

Good for: An organisation building its own clinical data repository, EHR or payer platform on FHIR, where an agent works against that store.

Ahead on:
- Agent ergonomics, 79 against 67
- Security & auth, 74 against 49
- Payments & pricing, 25 against 5
- Maintenance & community, 80 against 64

Watch for: No built-in rate limiting or brute-force protection, by the vendor's hardening page

### 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:
- Reliability, 66 against 59
- Transparency & trust, 59 against 45

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


## Score by category

| Category | Weight | Aidbox | Zus Health | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 59 | 66 | Zus Health +7 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 77 | even |
| Agent ergonomics | 13% (16.2 this run) | 79 | 67 | Aidbox +12 |
| Security & auth | 14% (17.5 this run) | 74 | 49 | Aidbox +25 |
| Payments & pricing | 10% (12.5 this run) | 25 | 5 | Aidbox +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 80 | 64 | Aidbox +16 |
| Transparency & trust | 7% (8.8 this run) | 45 | 59 | Zus Health +14 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **64.2 · B** | **56.6 · C** | |

## Facts side by side

| Fact | Aidbox | Zus Health |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Health Samurai, Inc. | Zus Health, Inc. |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | HTTP, Streamable HTTP, SSE (legacy) | HTTP |
| Auth | OAuth | OAuth |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Proprietary. Aidbox runs from Health Samurai's Docker images under a free development licence (no PHI) or a paid production licence. Examples and the Python SDK on GitHub are MIT | 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 | 9 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-08 | 2026-10-14 |
| Terms last updated | no document linked | 2025-03-11 |
| Privacy policy last updated | 2021-06-10 | 2026-06-24 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |

## Verdicts

**Aidbox.** Graded on the FHIR REST API of an Aidbox instance the owner runs. Monthly releases, two-year LTS lines, SMART on FHIR, AccessPolicy rules and AuditEvent logging are documented, and a free development licence needs no sales call. Aidbox has no rate limiting of its own, its MCP module is alpha, and no terms of service were found on the website.

**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

### Aidbox

1. Ask the operator for a Client with an AccessPolicy limited to the task. Don't rely on the public MCP policy, which the docs mark unsafe
2. Use `If-None-Exist` on creates and conditional update on identifiers so retries don't duplicate records
3. Use `_elements` and `_count` to keep responses small, and follow the Bundle's paging links
4. Throttle yourself. Aidbox applies no rate limit, so a burst lands on the customer's database
5. Don't load real patient data into an instance on a development licence

### 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, Aidbox or Zus Health?

Aidbox scores 64.2 (B) on agent readiness against Zus Health's 56.6 (C), and leads in 4 of 7 scored categories. Zus Health leads on reliability and transparency & trust.

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

Both use an OAuth sign-in.

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

No hosted endpoint is listed for Aidbox. No hosted endpoint is listed for Zus Health.


## For agents

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

## Other comparisons with Aidbox or Zus Health

- [Aidbox vs Health Gorilla](https://www.anchorterminal.com/compare/aidbox-vs-health-gorilla.md)
- [Aidbox vs Medblocks](https://www.anchorterminal.com/compare/aidbox-vs-medblocks.md)
- [Aidbox vs Medplum](https://www.anchorterminal.com/compare/aidbox-vs-medplum.md)
- [Aidbox vs Metriport Medical API](https://www.anchorterminal.com/compare/aidbox-vs-metriport.md)
- [Aidbox vs Particle Health](https://www.anchorterminal.com/compare/aidbox-vs-particle-health.md)
- [Aidbox vs Redox](https://www.anchorterminal.com/compare/aidbox-vs-redox.md)
- [Aidbox vs ROOK](https://www.anchorterminal.com/compare/aidbox-vs-rook.md)
- [Aidbox vs Terra API](https://www.anchorterminal.com/compare/aidbox-vs-terra.md)
- [Medplum vs Zus Health](https://www.anchorterminal.com/compare/medplum-vs-zus-health.md)
- [1upHealth vs Aidbox](https://www.anchorterminal.com/compare/1uphealth-vs-aidbox.md)
- [1upHealth vs Zus Health](https://www.anchorterminal.com/compare/1uphealth-vs-zus-health.md)
- [Health Gorilla vs Zus Health](https://www.anchorterminal.com/compare/health-gorilla-vs-zus-health.md)
- [Medblocks vs Zus Health](https://www.anchorterminal.com/compare/medblocks-vs-zus-health.md)
- [Metriport Medical API vs Zus Health](https://www.anchorterminal.com/compare/metriport-vs-zus-health.md)
- [Particle Health vs Zus Health](https://www.anchorterminal.com/compare/particle-health-vs-zus-health.md)
- [Aidbox vs Validic Inform](https://www.anchorterminal.com/compare/aidbox-vs-validic.md)
- [ROOK vs Zus Health](https://www.anchorterminal.com/compare/rook-vs-zus-health.md)
- [Terra API vs Zus Health](https://www.anchorterminal.com/compare/terra-vs-zus-health.md)
- [Validic Inform vs Zus Health](https://www.anchorterminal.com/compare/validic-vs-zus-health.md)
- [Redox vs Zus Health](https://www.anchorterminal.com/compare/redox-vs-zus-health.md)