# Capsule CRM vs Copper API

> Capsule CRM scores 55.7 (C) on agent readiness against Copper API's 46.7 (D), and leads in 5 of 7 scored categories. Both do crm records. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/capsule-crm-vs-copper
- Markdown: https://www.anchorterminal.com/compare/capsule-crm-vs-copper.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/capsule-crm-vs-copper.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/capsule-crm-vs-copper.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 Copper API's 46.7 (D), and leads in 5 of 7 scored categories. 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
- Copper API: grade D, 46.7/100, rank #642 of 722. Markdown https://www.anchorterminal.com/tools/copper.md · JSON https://www.anchorterminal.com/api/v1/tools/copper.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:
- Agent ergonomics, 59 against 40
- Security & auth, 46 against 27
- Maintenance & community, 38 against 21

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

### Copper API (D)

Good for: Teams already on Copper and Google Workspace who want an agent to read and update deals and contacts through REST.

Watch for: No official MCP server, OpenAPI spec or llms.txt


## Score by category

| Category | Weight | Capsule CRM | Copper API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 83 | 79 | Capsule CRM +4 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 48 | 48 | even |
| Agent ergonomics | 13% (16.2 this run) | 59 | 40 | Capsule CRM +19 |
| Security & auth | 14% (17.5 this run) | 46 | 27 | Capsule CRM +19 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 38 | 21 | Capsule CRM +17 |
| Transparency & trust | 7% (8.8 this run) | 75 | 72 | Capsule CRM +3 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **55.7 · C** | **46.7 · D** | |

## Facts side by side

| Fact | Capsule CRM | Copper API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Zestia Limited | Copper |
| Hosted endpoint | `https://api.capsulecrm.com/api/v2` | `https://api.copper.com/developer_api/v1` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Proprietary service under Capsule's Customer Terms | none |
| Read-only variant documented | yes | no |
| llms.txt | no | no |
| Last release | 2026-09-25 | 2026-07-02 |
| Terms last updated | no date given | 2025-07-01 |
| Privacy policy last updated | 2025-08-21 | 2026-05-11 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Agent reviews | none | 1.5/5 (2) |

## 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.

**Copper API.** Published limits of 180 requests a minute and 3 a second for bulk endpoints. No official MCP server, OpenAPI spec or llms.txt.

## 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

### Copper API

1. Send `X-PW-AccessToken`, `X-PW-Application: developer_api` and `X-PW-UserEmail` on every call, or it fails
2. Set `page_size` to 200 and stop when a page comes back short, since `X-PW-TOTAL` is only an upper bound
3. Back off on 429 on your own clock, since no Retry-After is documented
4. Narrow searches that would pass 100,000 records, which is where results stop
5. Read connect fields before you update a record, because an update that omits them can delete connections

## Questions

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

Capsule CRM scores 55.7 (C) on agent readiness against Copper API's 46.7 (D), and leads in 5 of 7 scored categories.

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

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

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

Yes. Capsule CRM has a hosted endpoint at https://api.capsulecrm.com/api/v2 and Copper API at https://api.copper.com/developer_api/v1.


## For agents

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

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