# Capsule CRM vs Nutshell

> Capsule CRM scores 55.7 (C) on agent readiness against Nutshell's 49.6 (D), and leads in 3 of 7 scored categories. Nutshell leads on schema & documentation, security & auth, payments & pricing and maintenance & community. Both do crm records. Category scores, facts, verdicts and…

- Canonical: https://www.anchorterminal.com/compare/capsule-crm-vs-nutshell
- Markdown: https://www.anchorterminal.com/compare/capsule-crm-vs-nutshell.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/capsule-crm-vs-nutshell.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/capsule-crm-vs-nutshell.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

Capsule CRM scores 55.7 (C) on agent readiness against Nutshell's 49.6 (D), and leads in 3 of 7 scored categories. Nutshell leads on schema & documentation, security & auth, payments & pricing and maintenance & community. Both do crm records.

- Capsule CRM: grade C, 55.7/100, rank #504 of 722. Markdown https://www.anchorterminal.com/tools/capsule-crm.md · JSON https://www.anchorterminal.com/api/v1/tools/capsule-crm.json
- Nutshell: grade D, 49.6/100, rank #607 of 722. Markdown https://www.anchorterminal.com/tools/nutshell.md · JSON https://www.anchorterminal.com/api/v1/tools/nutshell.json

## Which one, for what

### Capsule CRM (C)

Good for: Small teams already on Capsule who want an agent to read and write contacts, opportunities, projects and tasks over REST with a read-only scope available.

Ahead on:
- Reliability, 83 against 42
- Agent ergonomics, 59 against 44

Watch for: No OpenAPI file, llms.txt or official SDK was found

### Nutshell (D)

Good for: Small sales teams already on Nutshell who want an agent to read pipeline data over MCP or write records over REST at a low seat price.

Ahead on:
- Schema & documentation, 57 against 48
- Security & auth, 58 against 46
- Payments & pricing, 35 against 30
- Maintenance & community, 46 against 38

Watch for: No rate limit numbers, 429 handling or Retry-After found for the REST API


## Score by category

| Category | Weight | Capsule CRM | Nutshell | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 83 | 42 | Capsule CRM +41 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 48 | 57 | Nutshell +9 |
| Agent ergonomics | 13% (16.2 this run) | 59 | 44 | Capsule CRM +15 |
| Security & auth | 14% (17.5 this run) | 46 | 58 | Nutshell +12 |
| Payments & pricing | 10% (12.5 this run) | 30 | 35 | Nutshell +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 38 | 46 | Nutshell +8 |
| Transparency & trust | 7% (8.8 this run) | 75 | 71 | Capsule CRM +4 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **55.7 · C** | **49.6 · D** | |

## Facts side by side

| Fact | Capsule CRM | Nutshell |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Zestia Limited | Nutshell, Inc. |
| Hosted endpoint | `https://api.capsulecrm.com/api/v2` | `https://app.nutshell.com/rest` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Proprietary service under Capsule's Customer Terms | Proprietary service under Nutshell's Terms of Service |
| Read-only variant documented | yes | yes |
| llms.txt | no | yes |
| Last release | 2026-09-25 | 2026-08-21 |
| Terms last updated | no date given | 2026-06-02 |
| Privacy policy last updated | 2025-08-21 | 2026-06-02 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | not found in the text | yes |

## Verdicts

**Capsule CRM.** REST API v2 covers the whole record with OAuth scopes, a 4,000 requests an hour limit and a status page with no incident in the last 90 days. There is no OpenAPI file, llms.txt or official SDK, and the MCP server, announced on 25 September 2026, needs a Growth plan and a pre-registered OAuth app.

**Nutshell.** The REST reference is served as Markdown with an OpenAPI fragment per operation, and the hosted MCP server uses OAuth with PKCE and can only read. No rate limit numbers, error format or API changelog were found in the reviewed documentation, and API keys carry no scopes.

## Before you call either

### Capsule CRM

1. Send `Authorization: Bearer <token>` to `https://api.capsulecrm.com/api/v2`. Projects use the old name in paths, `/kases`
2. Follow the `Link` header for the next page. `perPage` goes up to 100 and the default is 50
3. On 429, wait until the epoch time in `X-RateLimit-Reset`. The docs suggest one second between calls
4. Ask for the `read` scope when the task only reads. A write with a read-only token answers 403 with `insufficient_scope`
5. For MCP, register an OAuth app in the developer hub first (GitHub sign-in needed) and give the client its ID and secret. Personal API tokens are refused

### Nutshell

1. Authenticate REST calls with HTTP Basic, a Nutshell user's email as username and the API key as password, against `https://app.nutshell.com/rest`
2. Use IDs in the `<number>-<type>` form, such as `3-accounts`, and send updates as JSON Patch with `content-type: application/json-patch+json`
3. Page lists with `page[limit]` and `page[page]`, which is 0-based, and call `/accounts/list/fields` or the lead and contact equivalents for valid filter keys
4. Use the REST API for writes. The MCP server only reads, and OAuth tokens need the `read` scope
5. Filter webhook events yourself, because every webhook receives all events and subscriptions are created in Setup, not through the API

## Questions

### Which is better for AI agents, Capsule CRM or Nutshell?

Capsule CRM scores 55.7 (C) on agent readiness against Nutshell's 49.6 (D), and leads in 3 of 7 scored categories. Nutshell leads on schema & documentation, security & auth, payments & pricing and maintenance & community.

### Do Capsule CRM and Nutshell need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Capsule CRM and Nutshell without installing anything?

Yes. Capsule CRM has a hosted endpoint at https://api.capsulecrm.com/api/v2 and Nutshell at https://app.nutshell.com/rest.


## For agents

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

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