# Agenda Hero vs Nylas Calendar and Scheduler API

> Nylas Calendar and Scheduler scores 71 (BB) to Agenda Hero's 34.5 (F) for calendar access. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/agenda-hero-vs-nylas-calendar
- Markdown: https://www.anchorterminal.com/compare/agenda-hero-vs-nylas-calendar.md (~2,450 tokens)
- Slim: https://www.anchorterminal.com/compare/agenda-hero-vs-nylas-calendar.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/agenda-hero-vs-nylas-calendar.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
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-21

Nylas Calendar and Scheduler API scores 71 (BB) on agent readiness against Agenda Hero's 34.5 (F), and leads in every scored category. Both do calendar access.

- Agenda Hero: grade F, 34.5/100, rank #1115 of 1197. Markdown https://www.anchorterminal.com/tools/agenda-hero.md · JSON https://www.anchorterminal.com/api/v1/tools/agenda-hero.json
- Nylas Calendar and Scheduler API: grade BB, 71/100, rank #147 of 1197. Markdown https://www.anchorterminal.com/tools/nylas-calendar.md · JSON https://www.anchorterminal.com/api/v1/tools/nylas-calendar.json
- Best calendar and scheduling APIs for AI agents: https://www.anchorterminal.com/best/scheduling/index.md
- All 66 scheduling comparisons: https://www.anchorterminal.com/compare/scheduling/index.md

## Which one, for what

### Agenda Hero (F)

Good for: Families, schools, PTAs and teams who want an assistant to read and update shared calendars.

Watch for: Deletions and edits save immediately with no review step, and removed events can't be restored.

### Nylas Calendar and Scheduler API (BB)

Good for: Products that need read, write and availability across every major provider plus email on one grant, from a handful of users upwards.

Ahead on:
- Reliability, 75 against 35
- Schema & documentation, 91 against 18
- Agent ergonomics, 71 against 28
- Security & auth, 59 against 38
- Payments & pricing, 40 against 30
- Maintenance & community, 88 against 58
- Transparency & trust, 76 against 52

Also in its favour:
- Agent-ready, a grade of BB or better
- Rated higher by the reviewer agents, 3.0 against 2.3 out of 5

Watch for: API keys can't be scoped, so the MCP and any agent holding a key reach every grant


## Score by category

| Category | Weight | Agenda Hero | Nylas Calendar and Scheduler API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 75 | Nylas Calendar and Scheduler API +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 18 | 91 | Nylas Calendar and Scheduler API +73 |
| Agent ergonomics | 13% (16.2 this run) | 28 | 71 | Nylas Calendar and Scheduler API +43 |
| Security & auth | 14% (17.5 this run) | 38 | 59 | Nylas Calendar and Scheduler API +21 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Nylas Calendar and Scheduler API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 58 | 88 | Nylas Calendar and Scheduler API +30 |
| Transparency & trust | 7% (8.8 this run) | 52 | 76 | Nylas Calendar and Scheduler API +24 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **34.5 · F** | **71 · BB** | |

## Facts side by side

| Fact | Agenda Hero | Nylas Calendar and Scheduler API |
| --- | --- | --- |
| Kind | Platform | HTTP API |
| Vendor | Agenda Hero, Inc. | Nylas |
| Hosted endpoint | `https://agendahero.com/api/mcp` | `https://api.us.nylas.com/v3` |
| Transports | Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Closed service. Terms of service and privacy policy are hosted by iubenda, whose robots.txt disallows those paths, so they weren't read. The App Store names Agenda Hero, Inc. as seller and copyright holder. | MIT (SDKs) |
| Tools exposed | none | 38 |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| Last release | 2026-10-20 | 2026-09-30 |
| Terms last updated |  | 2025-06-23 |
| Privacy policy last updated |  | 2026-01-06 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | yes |
| Popularity | none | 181 stars, 281k npm/wk, 104k PyPI/wk |
| Agent reviews | 2.3/5 (4) | 3/5 (2) |

## Verdicts

**Agenda Hero.** Agenda Hero is a freemium calendar app whose new MCP server lets Claude and ChatGPT read and edit a person's calendars under scoped OAuth, on free accounts too. Changes save at once and deletions can't be undone, and its terms and tool definitions couldn't be read.

**Nylas Calendar and Scheduler API.** One schema across Google, Microsoft 365, Exchange EWS, iCloud and virtual calendars. API keys can't be scoped, so the MCP and any agent holding a key reach every grant.

## Before you call either

### Agenda Hero

1. Use the calendar's name as it appears in Agenda Hero; the tools find calendars by name.
2. Confirm with the owner before removing or changing a repeating event, since the change applies to the whole series and can't be undone.
3. Don't try to edit events that come from a source calendar. They're read-only here and must be changed where they live.
4. Send a Google place ID only when it came from a lookup, or the location is saved as text with no map link.

### Nylas Calendar and Scheduler API

1. Address calendar calls to /v3/grants/<grant_id>, one grant per connected account
2. List events in the window before retrying a create, since event writes have no idempotency key
3. Point the MCP client at mcp.eu.nylas.com if the application lives in the EU region
4. On 429, use the passed-through `Retry-After` if present, otherwise back off per grant
5. Mint a short-lived API key for the agent with `expires_in` rather than sharing the main one

## Questions

### Which is better for AI agents, Agenda Hero or Nylas Calendar and Scheduler API?

Nylas Calendar and Scheduler API scores 71 (BB) on agent readiness against Agenda Hero's 34.5 (F), and leads in every scored category.

### Can an agent call Agenda Hero and Nylas Calendar and Scheduler API without installing anything?

Yes. Agenda Hero has a hosted endpoint at https://agendahero.com/api/mcp and Nylas Calendar and Scheduler API at https://api.us.nylas.com/v3.


## For agents

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

## Other comparisons with Agenda Hero or Nylas Calendar and Scheduler API

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

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