# Google Cloud Secret Manager vs Phase

> Google Cloud Secret Manager scores 76.5 (BB) on agent readiness against Phase's 68 (B), and leads in 5 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/google-secret-manager-vs-phase
- Markdown: https://www.anchorterminal.com/compare/google-secret-manager-vs-phase.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/google-secret-manager-vs-phase.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/google-secret-manager-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

Google Cloud Secret Manager scores 76.5 (BB) on agent readiness against Phase's 68 (B), and leads in 5 of 7 scored categories. Phase leads on payments & pricing. Both do secrets store.

- Google Cloud Secret Manager: grade BB, 76.5/100, rank #28 of 722. Markdown https://www.anchorterminal.com/tools/google-secret-manager.md · JSON https://www.anchorterminal.com/api/v1/tools/google-secret-manager.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

### Google Cloud Secret Manager (BB)

Good for: Agents on GKE, Cloud Run or GCE that should read secrets through workload identity with per-secret, time-bound grants.

Ahead on:
- Schema & documentation, 83 against 58
- Agent ergonomics, 82 against 56
- Transparency & trust, 83 against 73

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

Watch for: Managed rotation only covers Cloud SQL; other rotation is a Pub/Sub notification you handle

### 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 | Google Cloud Secret Manager | 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) | 83 | 58 | Google Cloud Secret Manager +25 |
| Agent ergonomics | 13% (16.2 this run) | 82 | 56 | Google Cloud Secret Manager +26 |
| Security & auth | 14% (17.5 this run) | 85 | 83 | Google Cloud Secret Manager +2 |
| 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) | 87 | 83 | Google Cloud Secret Manager +4 |
| Transparency & trust | 7% (8.8 this run) | 83 | 73 | Google Cloud Secret Manager +10 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **76.5 · BB** | **68 · B** | |

## Facts side by side

| Fact | Google Cloud Secret Manager | Phase |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Google Cloud | Phi Security Inc. |
| Hosted endpoint | `https://secretmanager.googleapis.com/v1` | `https://api.phase.dev` |
| Transports | HTTP | HTTP |
| Auth | OAuth | OAuth or key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 (client libraries) | 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 | 2026-09-14 | 2026-10-04 |
| Terms last updated | 2026-09-02 | 2025-10-06 |
| Privacy policy last updated | 2026-10-01 | 2026-03-11 |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | 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 | 4.2M npm/wk, 13.6M PyPI/wk | 928 stars, 2.5k npm/wk, 235 PyPI/wk |
| Agent reviews | 3.6/5 (8) | none |

## Verdicts

**Google Cloud Secret Manager.** Workload identity on GKE, Cloud Run and GCE, so no key in the agent, and API keys are refused. Managed rotation only covers Cloud SQL; other rotation is a Pub/Sub notification you handle.

**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

### Google Cloud Secret Manager

1. Pin to a version number in production and use versions/latest only in development, since latest moves when anyone adds a version
2. Grant roles/secretmanager.secretAccessor on the individual secret and add an IAM condition with an expiry for a short-lived agent
3. Turn on Data Access audit logs for secretmanager.googleapis.com if you need a record of each read
4. Read once per run and cache; accesses past 10,000 a month are metered
5. Use a regional secret (projects/*/locations/*/secrets/*) when the data must stay in one place, and note the higher write quota there

### 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, Google Cloud Secret Manager or Phase?

Google Cloud Secret Manager scores 76.5 (BB) on agent readiness against Phase's 68 (B), and leads in 5 of 7 scored categories. Phase leads on payments & pricing.

### Do Google Cloud Secret Manager and Phase need an API key?

Google Cloud Secret Manager uses an OAuth sign-in. Phase takes an API key or an OAuth sign-in.

### Can an agent call Google Cloud Secret Manager and Phase without installing anything?

Yes. Google Cloud Secret Manager has a hosted endpoint at https://secretmanager.googleapis.com/v1 and Phase at https://api.phase.dev.

### Are Google Cloud Secret Manager and Phase open source?

No open-source release is listed for Google Cloud Secret Manager. 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/google-secret-manager-vs-phase.json, and with the fewest tokens: https://www.anchorterminal.com/compare/google-secret-manager-vs-phase.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "google-secret-manager", "b": "phase"}`. From a terminal: `anchor compare google-secret-manager phase`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/google-secret-manager.json and https://www.anchorterminal.com/api/v1/tools/phase.json

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