# Azure Key Vault vs Phase

> Azure Key Vault scores 74.7 (BB) on agent readiness against Phase's 68 (B), and leads in 4 of 7 scored categories. Phase leads on payments & pricing. Both do secrets store. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/azure-key-vault-vs-phase
- Markdown: https://www.anchorterminal.com/compare/azure-key-vault-vs-phase.md (~2,450 tokens)
- Slim: https://www.anchorterminal.com/compare/azure-key-vault-vs-phase.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/azure-key-vault-vs-phase.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: 2026-10-08

Azure Key Vault scores 74.7 (BB) on agent readiness against Phase's 68 (B), and leads in 4 of 7 scored categories. Phase leads on payments & pricing. Both do secrets store.

- Azure Key Vault: grade BB, 74.7/100, rank #60 of 722. Markdown https://www.anchorterminal.com/tools/azure-key-vault.md · JSON https://www.anchorterminal.com/api/v1/tools/azure-key-vault.json
- Phase: grade B, 68/100, rank #194 of 722. Markdown https://www.anchorterminal.com/tools/phase.md · JSON https://www.anchorterminal.com/api/v1/tools/phase.json

## Which one, for what

### Azure Key Vault (BB)

Good for: Agents and runtimes already on Azure, where a managed identity reads a secret with no stored credential.

Ahead on:
- Schema & documentation, 85 against 58
- Agent ergonomics, 75 against 56

Also in its favour:
- Agent-ready, a grade of BB or better

Watch for: No managed rotation for secrets. Key Vault raises a near-expiry event 30 days ahead and the owner's Azure Function does the rotation

### Phase (B)

Good for: Small teams that want an open-source secrets manager hosted in the EU or self-hosted, with coding agents kept away from values through the CLI.

Ahead on:
- Payments & pricing, 25 against 20

Also in its favour:
- Open source

Watch for: No OpenAPI document was found. The REST reference is prose with examples, covering 47 operations


## Score by category

| Category | Weight | Azure Key Vault | Phase | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 87 | 91 | Phase +4 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 58 | Azure Key Vault +27 |
| Agent ergonomics | 13% (16.2 this run) | 75 | 56 | Azure Key Vault +19 |
| Security & auth | 14% (17.5 this run) | 86 | 83 | Azure Key Vault +3 |
| Payments & pricing | 10% (12.5 this run) | 20 | 25 | Phase +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 80 | 83 | Phase +3 |
| Transparency & trust | 7% (8.8 this run) | 77 | 73 | Azure Key Vault +4 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **74.7 · BB** | **68 · B** | |

## Facts side by side

| Fact | Azure Key Vault | Phase |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Microsoft Corporation | Phi Security Inc. |
| Hosted endpoint | `https://<vault-name>.vault.azure.net` | `https://api.phase.dev` |
| Transports | HTTP | HTTP |
| Auth | OAuth | OAuth or key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Microsoft's Product Terms. The Azure SDK client libraries are MIT | MIT outside the `ee/` directories, which are under the proprietary Phase Console Enterprise licence |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-10-02 | 2026-10-04 |
| Terms last updated | no date given | 2025-10-06 |
| Privacy policy last updated | 2026-09-01 | 2026-03-11 |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | yes | yes |
| 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 |
| Popularity | 2.6M npm/wk, 9.5M PyPI/wk | 928 stars, 2.5k npm/wk, 235 PyPI/wk |

## Verdicts

**Azure Key Vault.** Access runs on Microsoft Entra ID tokens and Azure roles that can be scoped to one secret, with soft delete, a 99.99 per cent SLA and a public OpenAPI contract. Secret rotation needs an Event Grid trigger and a function the owner writes, audit logging is off until enabled, and an Azure subscription needs a person and a payment card.

**Phase.** Service account tokens can be minted with an expiry over the API, every secret read is logged, and the CLI redacts values when it detects an AI agent. No OpenAPI document or pagination was found in the reviewed documentation, and the Free plan keeps audit logs for 24 hours.

## Before you call either

### Azure Key Vault

1. Request a token for the resource https://vault.azure.net and send it as a Bearer header. Every call must carry `api-version`, such as 2025-07-01, because there is no default
2. Ask for the Key Vault Secrets User role on the vault or the single secret. Key Vault Reader returns metadata only, not values
3. Cache secret values in memory. A vault allows 4,000 reads and 300 secret creations per 10 seconds, and a subscription five times that
4. On 429 wait 1, 2, 4, 8 then 16 seconds. Throttled requests do not count against the limit
5. Don't retry Set Secret blindly. Each successful call creates a new version of the secret

### Phase

1. Enable server-side encryption on the app before calling `/v1/secrets`. Without it the REST API cannot read or write that app's secrets
2. Send `Authorization: Bearer ServiceAccount <token>` for a service account and `Bearer User <token>` for a personal access token. The token type is part of the header
3. Stay under 120 requests a minute per account on Free and 240 on Pro, and wait the seconds in the `retry-after` header on a 429
4. Treat a 409 on `POST /v1/secrets` as the key already existing at that path, and use `PUT` to change it. Rotating secrets reject `PUT` and `DELETE`
5. Have a person run `phase ai enable` and choose masked values. The CLI blocks an agent from running `phase ai enable` or `phase ai disable` itself

## Questions

### Which is better for AI agents, Azure Key Vault or Phase?

Azure Key Vault scores 74.7 (BB) on agent readiness against Phase's 68 (B), and leads in 4 of 7 scored categories. Phase leads on payments & pricing.

### Do Azure Key Vault and Phase need an API key?

Azure Key Vault uses an OAuth sign-in. Phase takes an API key or an OAuth sign-in.

### Can an agent call Azure Key Vault and Phase without installing anything?

Yes. Azure Key Vault has a hosted endpoint at https://<vault-name>.vault.azure.net and Phase at https://api.phase.dev.

### Are Azure Key Vault and Phase open source?

No open-source release is listed for Azure Key Vault. Phase is open source (MIT outside the `ee/` directories, which are under the proprietary Phase Console Enterprise licence).


## For agents

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

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