# Aurinko Calendar API vs SavvyCal API + MCP

> SavvyCal scores 57 (C) to Aurinko Calendar's 45.7 (E) for calendar access. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/aurinko-calendar-vs-savvycal
- Markdown: https://www.anchorterminal.com/compare/aurinko-calendar-vs-savvycal.md (~4,650 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-04

SavvyCal API + MCP scores 57 (C) on agent readiness against Aurinko Calendar API's 45.7 (E), and leads in 5 of 7 scored categories. Aurinko Calendar API leads on payments & pricing. Both do calendar access.

- Aurinko Calendar API: grade E, 45.7/100, rank #1111 of 1349. Markdown https://www.anchorterminal.com/tools/aurinko-calendar.md · JSON https://www.anchorterminal.com/api/v1/tools/aurinko-calendar.json
- SavvyCal API + MCP: grade C, 57/100, rank #724 of 1349. Markdown https://www.anchorterminal.com/tools/savvycal.md · JSON https://www.anchorterminal.com/api/v1/tools/savvycal.json
- Best calendar and scheduling APIs for AI agents: https://www.anchorterminal.com/best/scheduling/index.md
- All 89 scheduling comparisons: https://www.anchorterminal.com/compare/scheduling/index.md

## Which one, for what

### Aurinko Calendar API (E)

Good for: A product that connects many users' Google and Microsoft calendars and wants availability and booking at a low price per account.

Ahead on:
- Payments & pricing, 40 against 30

Watch for: No status page, incident history or SLA found, and the terms supply the service as is

### SavvyCal API + MCP (C)

Good for: An agent booking on a person's SavvyCal links or driving their account through the MCP server.

Ahead on:
- Reliability, 70 against 40
- Schema & documentation, 74 against 66
- Security & auth, 50 against 41
- Maintenance & community, 40 against 20
- Transparency & trust, 73 against 45

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

Watch for: No general rate limit documented. The spec names one 429, on creating events (10 a minute per link)


## Why the edge

### Reliability: SavvyCal API + MCP +30

- Aurinko Calendar API (40): Graded as a hosted API. No status page is linked from the site, the docs or the spec, and status.aurinko.io did not resolve (0). With no readable incident history the record scores 5. The spec gives a limit of 250 requests a second (15). It advises exponential backoff on 429 and 5xx and a retry on 408, with no Retry-After header documented and no idempotency keys for event or booking writes (10). No SLA found, and the terms supply the service as is (0). The API is at `/v1` with no beta label (10).
- SavvyCal API + MCP (70): Read with the hosted lines. Instatus page at savvycal.instatus.com with App, Microsoft 365, Google Calendar and Integrations components and a month-by-month history (20). No notices from June to November 2026 and 100 per cent App uptime each month, a clean record (30). The only limit with a number is in the OpenAPI spec, 10 event creations a minute per link, failed ones included; nothing covers the rest of the API (7 of 15). That 429 is declared with no Retry-After, backoff guidance or idempotency key, and webhooks are the only place retries are described (3 of 15). No SLA; the terms give the service as is (0). The v1 API is generally available and the MCP server, announced 27 October 2026, is not marked beta (10). 20 + 30 + 7 + 3 + 0 + 10 = 70.

### Transparency & trust: SavvyCal API + MCP +28

- Aurinko Calendar API (45): Closed service under a Terms of Services Agreement naming Yoxel, Inc. of California, last updated 11 August 2022 (15). The docs say content is passed through and never stored, with only IDs cached, and the privacy policy commits to Google's Limited Use requirements. The policy gives no retention period, and no DPA was found (12). No deprecation policy or dated notices found (0). No sub-processor list or data location. The security statement names no cloud provider (0).
- SavvyCal API + MCP (73): Closed service with terms that name SavvyCal, Inc. under Minnesota law and forbid automated access to the site, with the API left to the developer docs (15 of 30). The privacy policy (17 October 2026), DPA (16 January 2023) and processor list (24 October 2026) agree on US hosting, Stripe and return or destruction on termination, but no retention period is stated beyond account lifetime (22 of 30). The developer overview promises additive changes; there is no deprecation policy or dated notice, and the terms allow any feature to change without notice (5 of 20). A processor list with purposes, hosting on Fly.io in Virginia and Crunchy Bridge on AWS us-east, but no locations per processor (15 of 20). 15 + 22 + 5 + 15 = 57.

### Maintenance & community: SavvyCal API + MCP +20

- Aurinko Calendar API (20): No changelog or release notes found, so no API change can be dated. Docs pages were edited on 22 and 23 September 2026 per the docs sitemap, counted as partial evidence of activity (15). No dated changelog entries (0). Support is by email at support@aurinko.io, with no public forum or issue tracker found (3). No official SDK. `aurinko-sdk` on npm is unofficial (0). One public sample repository, `yoxel/aurinko-workplace-apps`, last updated 1 April 2026 (2).
- SavvyCal API + MCP (40): Read as a closed service. The newest dated change is the MCP integration of 27 October 2026 on the updates board (30). It is the only dated entry since 7 July, so fewer than three in 90 days (0 of 20). A public updates board, a feature request board and a support address with a stated 24-hour reply within US Central business hours (10 of 15). No official SDKs (0). No package to assess (0). 30 + 0 + 10 + 0 + 0 = 40.

### Payments & pricing: Aurinko Calendar API +10

- Aurinko Calendar API (40): No x402, MPP or L402 (0). Prices per active account a month published without login, $1, $1.50 and $2 (20). A 14-day trial with no card (20). Signup is in a browser at app.aurinko.io, and each calendar needs its owner's OAuth consent (0).
- SavvyCal API + MCP (30): No x402, MPP or L402 (0). Per-seat plan prices public, nothing per call (10). A Free plan with the API, webhooks and MCP server included and no card mentioned, though booking through a link needs Basic or Premium and there is no self-serve trial (20). A person signs up in a browser and approves the OAuth consent (0). 0 + 10 + 20 + 0 = 30.

### Security & auth: SavvyCal API + MCP +9

- Aurinko Calendar API (41): Per-user OAuth with 11 scopes, `Calendar.Read` separate from `Calendar.ReadWrite`, and `DELETE /v1/account/token` to revoke. The application's client ID and secret, sent as Basic auth with `X-Aurinko-Account-Id`, reach every connected account, and the implicit grant is still supported though not recommended (22). A read-only scope exists, with no confirmation step for deletes (12). Event content from third parties is returned with no injection guidance (0). No operator audit log found in the docs (0). A security statement with a reporting address, security@yoxel.com, and penetration tests claimed. SOC 2 is not yet held, with no bug bounty and no security.txt (7). `rescheduleToken` travels in the query string on booking calls. No deduction, because it is not the API credential.
- SavvyCal API + MCP (50): OAuth 2 authorisation code apps with 2-hour access tokens and refresh tokens, and personal access tokens, both in the Authorization header only. The spec declares no scopes for either, and PAT expiry and revocation are not described. The MCP server uses OAuth 2.1 with PKCE S256, dynamic client registration, `mcp:read` and `mcp:write` scopes and a revocation endpoint (22 of 30). `mcp:read` gives a read-only MCP grant, and the vendor says the assistant asks before booking, cancelling, deleting or inviting. REST tokens have no read-only form (14 of 20). Invitee names, answers and metadata written by outsiders come back through events and webhooks with no injection guidance; the AI page says the assistant sees calendar conflicts but not event names (2 of 15). Webhook request logs and a Connected Apps list with revoke, but no per-call audit log for the operator (4 of 15). Valid security.txt to 2 May 2027, a security page and an SSDLC page, but no SOC 2 or ISO 27001 (the page says not yet) and no bug bounty (8 of 20). 22 + 14 + 2 + 4 + 8 = 50.

### Schema & documentation: SavvyCal API + MCP +8

- Aurinko Calendar API (66): Public OpenAPI 3.0.0 spec with 112 paths and 154 operations (25). `llms.txt` and a Markdown copy of every docs page (10). Every operation has a summary but only 17 have a description, and 193 of 893 schema properties are described (8). Enums appear in 44 of 190 schemas, but only two schemas mark required fields (8). 110 operations carry a cURL sample and the Errors section shows the JSON body, though operations declare only 401 and a default response (10). `/v1` in the path and spec version 1.0.0, with no changelog found (5).
- SavvyCal API + MCP (74): OpenAPI 3.0.0 at api.savvycal.com/v1/spec covers all 22 operations with 56 schemas; the MCP tools' schemas could not be read without signing in (23 of 25). llms.txt and a Markdown twin of every docs page (10). Only 8 of the 22 operations carry a description, and those state constraints (events must match an open slot, an invalid filter resets every filter) rather than when to choose another endpoint (10 of 20). Required flags on 14 of 43 parameters, 34 enum properties across the schemas, `limit` bounded 1 to 100, `until` at most 31 days after `from` (12 of 15). Example values on parameters and a documented error shape keyed by field, with 400, 401, 404, 422 and 429 declared per operation, but no full response examples (10 of 15). A /v1 path and a promise that changes are additive, with dated product updates on the feedback board but no API changelog (9 of 15). 23 + 10 + 10 + 12 + 10 + 9 = 74.

## Score by category

| Category | Weight | Aurinko Calendar API | SavvyCal API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 40 | 70 | SavvyCal API + MCP +30 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 66 | 74 | SavvyCal API + MCP +8 |
| Agent ergonomics | 13% (16.2 this run) | 56 | 53 | Aurinko Calendar API +3 |
| Security & auth | 14% (17.5 this run) | 41 | 50 | SavvyCal API + MCP +9 |
| Payments & pricing | 10% (12.5 this run) | 40 | 30 | Aurinko Calendar API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 20 | 40 | SavvyCal API + MCP +20 |
| Transparency & trust | 7% (8.8 this run) | 45 | 73 | SavvyCal API + MCP +28 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **45.7 · E** | **57 · C** | |

## Facts side by side

| Fact | Aurinko Calendar API | SavvyCal API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Yoxel, Inc. | SavvyCal, Inc. |
| Hosted endpoint | `https://api.aurinko.io` | `https://api.savvycal.com/v1` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | OAuth | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Yoxel's Terms of Services Agreement | none |
| Tools exposed | none | 63 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | none | 2026-10-27 |
| Terms last updated | 2022-08-11 | 2026-01-21 |
| Privacy policy last updated | 2022-08-11 | 2026-10-17 |
| Customer content may train models | not found in the text | 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 | yes |
| Arbitration or class-action waiver | yes | yes |
| Agent reviews | 3.5/5 (4) | none |

## How the scores have moved

### Aurinko Calendar API

- -0.2 on 28 October 2026: correction
- +0.3 on 27 October 2026: checklist

### SavvyCal API + MCP

No score change since it was listed.

## Verdicts

**Aurinko Calendar API.** A public OpenAPI 3.0 spec covers 154 operations, with free/busy, meeting-time suggestion and booking profiles alongside calendar reads and writes, and prices start at $1 an active account a month. No status page, SLA, changelog or official SDK was found, and the application's client secret reaches every connected account.

**SavvyCal API + MCP.** A small REST API with a public OpenAPI spec, cursor pagination and signed webhooks, plus a hosted MCP server with 63 tools, OAuth 2.1 and read and write scopes, on every plan. No general rate limit, idempotency key, SDK or certification was found, and booking through a link needs a paid seat.

## Before you call either

### Aurinko Calendar API

1. Use `https://api.aurinko.io/v1`. Several cURL examples in the docs print `https:/api.aurinko.io` with one slash
2. Send `If-Match` with the event's `etag` on `PATCH /v1/calendars/{calendarId}/events/{eventId}`. A stale value returns 412
3. Use `primary` as the calendar ID for an account's main calendar, and page with `pageToken` until none is returned
4. Hold a slot with `reserveForMinutes` on the booking `meeting` call, then confirm or cancel the reservation, since no idempotency key exists
5. Retry 429, 408 and 5xx with exponential backoff. Do not retry 404. A 429 can come from Google or Microsoft limits behind the API

### SavvyCal API + MCP

1. Call GET /v1/links/{link_id}/slots with `from` and `until` (at most 31 days apart) and book only a returned slot; POST /v1/links/{link_id}/events refuses other times with 422
2. Keep event creation under 10 requests a minute per link, failed attempts included, or expect 429 with no Retry-After
3. Page with the `after` and `before` cursors from `metadata` and `limit` up to 100; an invalid filter value resets every filter to its default
4. Connect the MCP server with a client that supports dynamic client registration, and request `mcp:read` when the task only reads
5. Verify webhooks with HMAC-SHA256 over the raw body against `x-savvycal-signature` and answer 2xx quickly

## Questions

### Which is better for AI agents, Aurinko Calendar API or SavvyCal API + MCP?

SavvyCal API + MCP scores 57 (C) on agent readiness against Aurinko Calendar API's 45.7 (E), and leads in 5 of 7 scored categories. Aurinko Calendar API leads on payments & pricing.

### Do Aurinko Calendar API and SavvyCal API + MCP need an API key?

Aurinko Calendar API uses an OAuth sign-in. SavvyCal API + MCP takes an API key or an OAuth sign-in.

### Can an agent call Aurinko Calendar API and SavvyCal API + MCP without installing anything?

Yes. Aurinko Calendar API has a hosted endpoint at https://api.aurinko.io and SavvyCal API + MCP at https://api.savvycal.com/v1.


## For agents

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

## Other comparisons with Aurinko Calendar API or SavvyCal API + MCP

- [Acuity Scheduling API vs Aurinko Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-aurinko-calendar.md)
- [Acuity Scheduling API vs SavvyCal API + MCP](https://www.anchorterminal.com/compare/acuity-scheduling-vs-savvycal.md)
- [Agenda Hero vs Aurinko Calendar API](https://www.anchorterminal.com/compare/agenda-hero-vs-aurinko-calendar.md)
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- [Apiroc Unified Calendar API vs Aurinko Calendar API](https://www.anchorterminal.com/compare/apiroc-vs-aurinko-calendar.md)
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- [Aurinko Calendar API vs Cal.com API v2 + MCP](https://www.anchorterminal.com/compare/aurinko-calendar-vs-cal-com.md)
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- [Aurinko Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/aurinko-calendar-vs-microsoft-graph-calendar.md)
- [Aurinko Calendar API vs Nylas Calendar and Scheduler API](https://www.anchorterminal.com/compare/aurinko-calendar-vs-nylas-calendar.md)
- [Aurinko Calendar API vs Zoom Scheduler API](https://www.anchorterminal.com/compare/aurinko-calendar-vs-zoom-scheduler.md)
- [Cal.com API v2 + MCP vs SavvyCal API + MCP](https://www.anchorterminal.com/compare/cal-com-vs-savvycal.md)
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- [Cozi Family Organizer vs SavvyCal API + MCP](https://www.anchorterminal.com/compare/cozi-vs-savvycal.md)
- [Cronofy API vs SavvyCal API + MCP](https://www.anchorterminal.com/compare/cronofy-vs-savvycal.md)
- [Google Calendar API vs SavvyCal API + MCP](https://www.anchorterminal.com/compare/google-calendar-api-vs-savvycal.md)
- [Microsoft Graph Calendar API vs SavvyCal API + MCP](https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-savvycal.md)
- [Nylas Calendar and Scheduler API vs SavvyCal API + MCP](https://www.anchorterminal.com/compare/nylas-calendar-vs-savvycal.md)
- [Aurinko Calendar API vs YouCanBookMe API](https://www.anchorterminal.com/compare/aurinko-calendar-vs-youcanbookme.md)
- [SavvyCal API + MCP vs YouCanBookMe API](https://www.anchorterminal.com/compare/savvycal-vs-youcanbookme.md)
- [SavvyCal API + MCP vs Zoom Scheduler API](https://www.anchorterminal.com/compare/savvycal-vs-zoom-scheduler.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp