# Gmail API vs Outlook Mail (Microsoft Graph) (slim)

> Gmail API scores 77.8 (BB) on agent readiness against Outlook Mail (Microsoft Graph)'s 66.3 (B), and leads in 5 of 7 scored categories. Outlook Mail (Microsoft Graph) leads on schema & documentation. Both do mailbox read. Category scores, facts, verdicts and agent notes side by…

- Full: https://www.anchorterminal.com/compare/gmail-api-vs-outlook-mail-graph.md (~2,050 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/gmail-api-vs-outlook-mail-graph.json · canonical https://www.anchorterminal.com/compare/gmail-api-vs-outlook-mail-graph
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Gmail API scores 77.8 (BB) on agent readiness against Outlook Mail (Microsoft Graph)'s 66.3 (B), and leads in 5 of 7 scored categories. Outlook Mail (Microsoft Graph) leads on schema & documentation. Both do mailbox read.

- Gmail API: BB 77.8, rank #17 of 629 · https://www.anchorterminal.com/tools/gmail-api.min.md
- Outlook Mail (Microsoft Graph): B 66.3, rank #221 of 629 · https://www.anchorterminal.com/tools/outlook-mail-graph.min.md
- Gmail API, 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 60; Security & auth, 81 against 71; Maintenance & community, 85 against 76; Transparency & trust, 82 against 75. Also Agent-ready, a grade of BB or better; No incidents deducted, where Outlook Mail (Microsoft Graph) loses 4 points for them.
- Outlook Mail (Microsoft Graph), good for Agents working in Microsoft 365 or Outlook.com mailboxes that need scoped reading, drafting, sending and incremental sync. Ahead on Schema & documentation, 93 against 82.

| Category | Gmail API | Outlook Mail (Microsoft Graph) |
| --- | --- | --- |
| Reliability (16%) | 90 | 60 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 82 | 93 |
| Agent ergonomics (13%) | 82 | 81 |
| Security & auth (14%) | 81 | 71 |
| Payments & pricing (10%) | 35 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 76 |
| Transparency & trust (7%) | 82 | 75 |

| Fact (where they differ) | Gmail API | Outlook Mail (Microsoft Graph) |
| --- | --- | --- |
| Vendor | Google | Microsoft |
| Hosted endpoint | `https://gmail.googleapis.com/gmail/v1` | `https://graph.microsoft.com/v1.0` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Pricing | Free | Your plan |
| Licence | Apache-2.0 (client libraries) | MIT (SDKs) |
| Tools exposed | 23 | 10 |
| Last release | 2026-09-23 | 2026-10-06 |
| Terms last updated | 2021-11-09 | 2025-10-01 |
| Privacy policy last updated | 2026-10-01 | 2026-09-01 |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | yes |
| Popularity | 12k stars, 1.1M npm/wk | 835 stars, 2.9M npm/wk, 1.6M PyPI/wk |