# Codat vs Pennylane

> Pennylane scores 66.3 (B) to Codat's 64.3 (B) for accounting ledgers. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/codat-vs-pennylane
- Markdown: https://www.anchorterminal.com/compare/codat-vs-pennylane.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/codat-vs-pennylane.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/codat-vs-pennylane.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: 2026-10-09

Pennylane scores 66.3 (B) on agent readiness against Codat's 64.3 (B), and leads in 4 of 7 scored categories. Codat leads on reliability, agent ergonomics and maintenance & community. Both do accounting ledgers.

- Codat: grade B, 64.3/100, rank #357 of 950. Markdown https://www.anchorterminal.com/tools/codat.md · JSON https://www.anchorterminal.com/api/v1/tools/codat.json
- Pennylane: grade B, 66.3/100, rank #297 of 950. Markdown https://www.anchorterminal.com/tools/pennylane.md · JSON https://www.anchorterminal.com/api/v1/tools/pennylane.json
- Best accounting and invoicing APIs for AI agents: https://www.anchorterminal.com/best/accounting/index.md
- All 66 accounting comparisons: https://www.anchorterminal.com/compare/accounting/index.md

## Which one, for what

### Codat (B)

Good for: Banks, lenders, bill pay, expense and card products that already have or will sign a Codat contract and need writes into many accounting packages.

Ahead on:
- Reliability, 80 against 75
- Agent ergonomics, 81 against 66
- Maintenance & community, 75 against 65

Watch for: No public price. The pricing page returns 404 and fees are set in an order form

### Pennylane (B)

Good for: An agent working on the books of French companies or an accounting firm's client portfolio, with French chart of accounts, FEC export, Factur-X e-invoicing and VAT returns.

Ahead on:
- Schema & documentation, 85 against 77
- Security & auth, 68 against 49
- Payments & pricing, 20 against 10
- Transparency & trust, 76 against 71

Watch for: The API agreement allows changes, suspension or revocation with or without notice and supplies the API as is


## Score by category

| Category | Weight | Codat | Pennylane | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 75 | Codat +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 85 | Pennylane +8 |
| Agent ergonomics | 13% (16.2 this run) | 81 | 66 | Codat +15 |
| Security & auth | 14% (17.5 this run) | 49 | 68 | Pennylane +19 |
| Payments & pricing | 10% (12.5 this run) | 10 | 20 | Pennylane +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 75 | 65 | Codat +10 |
| Transparency & trust | 7% (8.8 this run) | 71 | 76 | Pennylane +5 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **64.3 · B** | **66.3 · B** | |

## Facts side by side

| Fact | Codat | Pennylane |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Codat Limited | Pennylane SAS |
| Hosted endpoint | `https://api.codat.io` | `https://app.pennylane.com/api/external/v2` |
| Transports | HTTP | HTTP |
| Auth | API key | OAuth or key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Proprietary service under Codat's Master Services Agreement. The documentation repository codatio/codat-docs is Apache-2.0 | Proprietary service under Pennylane's API agreement and customer terms |
| Tools exposed | none | 31 |
| Read-only variant documented | no | yes |
| llms.txt | no | yes |
| Last release | 2026-10-01 | 2026-09-30 |
| Terms last updated | 2022-09-05 | no date given |
| Privacy policy last updated | 2025-04-01 | no date given |
| 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 | yes | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 2.7k npm/wk, 222 PyPI/wk | none |

## Verdicts

**Codat.** Public OpenAPI specs, an Idempotency-Key header on writes, Retry-After on 429 and a written three-month deprecation notice suit an agent that retries. Access is the limitation. No price or self-serve signup is published, the general Accounting API is closed to new clients, and API keys carry no scopes.

**Pennylane.** The v2 API has per-resource read and write scopes, an OpenAPI definition on every reference page, llms.txt and a breaking-change process that ran over 24 weeks. Access needs a paid Essentiel plan or partner approval, creation endpoints are not idempotent, and the API agreement lets Pennylane change or revoke the API without notice.

## Before you call either

### Codat

1. Send `Authorization: Basic <base64 of the API key>` to https://api.codat.io. The Portal shows the ready-made header value
2. Send a new GUID as `Idempotency-Key` on every POST and PATCH, and reuse the same key when retrying after a 429
3. Treat writes as asynchronous on most APIs. Keep the push operation key and wait for the `{dataType}.write.successful` or `.unsuccessful` webhook
4. Call the Get model (options) endpoint for the connection before a create or update, because required fields differ by accounting package
5. Filter with `query=modifiedDate>...` and keep `pageSize` at 100. The daily quota is 1,000 requests times one plus the number of active connected companies

### Pennylane

1. Call `GET https://app.pennylane.com/api/external/v2/me` first to confirm the token, user and company context
2. Stay under 25 requests per 5 seconds per token and wait for the `retry-after` value on a 429
3. Do not retry a create after a timeout without checking first. Only supplier invoice imports are deduplicated
4. Send `filter` and `sort` again with every `cursor`. The cursor stores position only
5. Send amounts as strings such as "120.00", and ask for `:readonly` scopes when the task only reads
6. Use the MCP server for reads only. It cannot create, edit or delete, and firm connections need `company_id`

## Questions

### Which is better for AI agents, Codat or Pennylane?

Pennylane scores 66.3 (B) on agent readiness against Codat's 64.3 (B), and leads in 4 of 7 scored categories. Codat leads on reliability, agent ergonomics and maintenance & community.

### Do Codat and Pennylane need an API key?

Codat needs an API key. Pennylane takes an API key or an OAuth sign-in.

### Can an agent call Codat and Pennylane without installing anything?

Yes. Codat has a hosted endpoint at https://api.codat.io and Pennylane at https://app.pennylane.com/api/external/v2.


## For agents

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

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- [Codat vs Invoice Ninja API](https://www.anchorterminal.com/compare/codat-vs-invoice-ninja.md)
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