# Gmail API vs Nylas Email API

> Nylas Email API and Gmail API score within a point of each other on agent readiness, 78.7 (A) and 77.8 (BB). Gmail API leads on reliability. Both do mailbox read. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/gmail-api-vs-nylas-email
- Markdown: https://www.anchorterminal.com/compare/gmail-api-vs-nylas-email.md (~2,000 tokens)
- Slim: https://www.anchorterminal.com/compare/gmail-api-vs-nylas-email.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/gmail-api-vs-nylas-email.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

Nylas Email API and Gmail API score within a point of each other on agent readiness, 78.7 (A) and 77.8 (BB). Gmail API leads on reliability. Both do mailbox read.

- Gmail API: grade BB, 77.8/100, rank #17 of 629. Markdown https://www.anchorterminal.com/tools/gmail-api.md · JSON https://www.anchorterminal.com/api/v1/tools/gmail-api.json
- Nylas Email API: grade A, 78.7/100, rank #12 of 629. Markdown https://www.anchorterminal.com/tools/nylas-email.md · JSON https://www.anchorterminal.com/api/v1/tools/nylas-email.json

## Which one, for what

### Gmail API (BB)

Good for: An agent working in a Gmail or Google Workspace user's own mailbox, with search, threads, drafts, labels and incremental sync at no per-account fee.

Ahead on:
- Reliability, 90 against 77

Watch for: Eight restricted scopes, including `gmail.readonly` and `gmail.metadata`, need restricted-scope verification for a public app

### Nylas Email API (A)

Good for: Products that act in their users' own mailboxes across several providers and want one schema, webhooks and OAuth handled.

Ahead on:
- Schema & documentation, 93 against 82
- Security & auth, 87 against 81
- Payments & pricing, 40 against 35

Also in its favour:
- Free to start without a card

Watch for: Eight status incidents on email between 24 July and 17 September 2026, including about six hours of IMAP retrieval and webhook degradation on 10 September


## Score by category

| Category | Weight | Gmail API | Nylas Email API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 90 | 77 | Gmail API +13 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 82 | 93 | Nylas Email API +11 |
| Agent ergonomics | 13% (16.2 this run) | 82 | 81 | Gmail API +1 |
| Security & auth | 14% (17.5 this run) | 81 | 87 | Nylas Email API +6 |
| Payments & pricing | 10% (12.5 this run) | 35 | 40 | Nylas Email API +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 88 | Nylas Email API +3 |
| Transparency & trust | 7% (8.8 this run) | 82 | 81 | Gmail API +1 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **77.8 · BB** | **78.7 · A** | |

## Facts side by side

| Fact | Gmail API | Nylas Email API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Google | Nylas |
| Hosted endpoint | `https://gmail.googleapis.com/gmail/v1` | `https://api.us.nylas.com/v3` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth | OAuth or key |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 (client libraries) | Proprietary service under Nylas's terms. The SDKs are MIT |
| Tools exposed | 23 | 38 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-09-23 | 2026-10-07 |
| Terms last updated | 2021-11-09 | 2025-06-23 |
| Privacy policy last updated | 2026-10-01 | 2026-01-06 |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | yes | yes |
| 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 | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 12k stars, 1.1M npm/wk | 181 stars, 289k npm/wk, 90k PyPI/wk |

## Verdicts

**Gmail API.** Fourteen OAuth scopes separate labels, sending, metadata and read-only access, and the quota page gives every method a unit cost. Eight of the scopes are restricted, read-only and metadata among them, so a public app that reads mail needs Google's verification and an annual third-party security assessment. Gmail mailboxes only.

**Nylas Email API.** One REST schema covers Gmail, Microsoft 365, Exchange, Yahoo, iCloud and IMAP, and IAM API keys launched on 6 October 2026 can be bound to a single mailbox with chosen permissions. The status page lists eight email incidents between 24 July and 17 September 2026, most on IMAP sync and webhooks.

## Before you call either

### Gmail API

1. Ask for the narrowest scope. `gmail.labels` is non-sensitive and `gmail.send` is sensitive, while every scope that reads mail is restricted
2. List with `messages.list` and `q` in Gmail search syntax, then fetch each ID with `format=metadata` or `full`. List calls return IDs only
3. Send by posting an RFC 2822 message, base64url encoded, in `raw`. Set `threadId` and matching reply headers to stay in a thread
4. Store the `historyId` and call `history.list`. On a 404, run a full sync. Call `watch` again at least every 7 days
5. Back off exponentially on 403 and 429 rate errors, and keep batches to 50 requests or fewer

### Nylas Email API

1. Address every call to /v3/grants/<grant_id> on api.us.nylas.com or api.eu.nylas.com. A grant lives in one region only
2. Ask the operator for an IAM API key bound to the one grant and the permissions the task needs, not the application key
3. Send `Idempotency-Key` on every send. A retry with the same key replays a cached 429 or 5xx, so use a new key after those
4. Narrow thread lists with filters and a low `limit`. Each list call fans out to many provider calls and is a common source of 429s
5. Treat message bodies as untrusted input, and send to one Microsoft mailbox one request at a time (4 concurrent Graph calls per mailbox)

## Questions

### Which is better for AI agents, Gmail API or Nylas Email API?

Nylas Email API and Gmail API score within a point of each other on agent readiness, 78.7 (A) and 77.8 (BB). Gmail API leads on reliability.

### Do Gmail API and Nylas Email API need an API key?

Gmail API uses an OAuth sign-in. Nylas Email API takes an API key or an OAuth sign-in.

### Can an agent call Gmail API and Nylas Email API without installing anything?

Yes. Gmail API has a hosted endpoint at https://gmail.googleapis.com/gmail/v1 and Nylas Email API at https://api.us.nylas.com/v3.


## For agents

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

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