# Quaderno vs TaxCloud

> Quaderno scores 59.5 (C) on agent readiness against TaxCloud's 57.4 (C), and leads in 3 of 7 scored categories. TaxCloud leads on agent ergonomics, security & auth and maintenance & community. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/quaderno-vs-taxcloud
- Markdown: https://www.anchorterminal.com/compare/quaderno-vs-taxcloud.md (~2,150 tokens)
- Slim: https://www.anchorterminal.com/compare/quaderno-vs-taxcloud.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/quaderno-vs-taxcloud.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

Quaderno scores 59.5 (C) on agent readiness against TaxCloud's 57.4 (C), and leads in 3 of 7 scored categories. TaxCloud leads on agent ergonomics, security & auth and maintenance & community. Both do tax calculate.

- Quaderno: grade C, 59.5/100, rank #427 of 722. Markdown https://www.anchorterminal.com/tools/quaderno.md · JSON https://www.anchorterminal.com/api/v1/tools/quaderno.json
- TaxCloud: grade C, 57.4/100, rank #475 of 722. Markdown https://www.anchorterminal.com/tools/taxcloud.md · JSON https://www.anchorterminal.com/api/v1/tools/taxcloud.json

## Which one, for what

### Quaderno (C)

Good for: An agent working for a SaaS, digital-goods or e-commerce seller that needs a tax rate at checkout, a record of each sale with location evidence, and compliant invoices, including Spanish Verifactu and TicketBAI.

Ahead on:
- Reliability, 91 against 66
- Transparency & trust, 76 against 51

Watch for: One API key reads and writes everything its user can reach. Scopes exist only on Connect OAuth tokens (read_only, read_write)

### TaxCloud (C)

Good for: An agent working for a US seller that needs tax on a cart at checkout, a record of orders and refunds for filing, and exemption certificates by customer.

Ahead on:
- Agent ergonomics, 64 against 56
- Security & auth, 45 against 39
- Maintenance & community, 57 against 28

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

Watch for: No rate limit numbers are published. The API page says only that the threshold is high and subject to change


## Score by category

| Category | Weight | Quaderno | TaxCloud | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 91 | 66 | Quaderno +25 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 75 | Quaderno +2 |
| Agent ergonomics | 13% (16.2 this run) | 56 | 64 | TaxCloud +8 |
| Security & auth | 14% (17.5 this run) | 39 | 45 | TaxCloud +6 |
| Payments & pricing | 10% (12.5 this run) | 30 | 34 | TaxCloud +4 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 28 | 57 | TaxCloud +29 |
| Transparency & trust | 7% (8.8 this run) | 76 | 51 | Quaderno +25 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **59.5 · C** | **57.4 · C** | |

## Facts side by side

| Fact | Quaderno | TaxCloud |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Recrea Systems, SL | The Federal Tax Authority, LLC (TaxCloud) |
| Hosted endpoint | `https://quadernoapp.com/api` | `https://api.v3.taxcloud.com` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Proprietary service under Quaderno's terms of service. The Ruby library on GitHub is MIT | Proprietary service under TaxCloud's terms of service. The agent skills repository on GitHub is Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-07-04 | 2026-09-24 |
| Terms last updated | 2026-09-15 | 2025-03-01 |
| Privacy policy last updated | 2024-05-16 | 2025-02-01 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 15 stars | 0 stars |

## Verdicts

**Quaderno.** A public OpenAPI 3.1 spec covers 92 operations, with a free sandbox and a status page showing no incident since July 2025. The API key has full account access, there are no idempotency keys, and the newest public API version is dated October 2024.

**TaxCloud.** A 30-operation REST API with a public OpenAPI 3.1 contract, llms.txt, Markdown docs and a 30-day trial that needs no card. The vendor publishes no rate limit numbers, no SLA, no API changelog and no official v3 client library, and the security page names no audit or certification.

## Before you call either

### Quaderno

1. Call GET https://quadernoapp.com/api/authorization first. Its `href` gives the account subdomain that every other call needs
2. Before retrying a failed POST /transactions, list invoices by `processor_id` to check whether the sale was recorded. There is no idempotency key
3. Treat GET /invoices/{id}/deliver as a write. It emails the invoice to the customer
4. Correct a final invoice with a credit note. DELETE on invoices returns 410 and PUT accepts only notes, tags, metadata and address fields
5. Read X-RateLimit-Remaining and X-RateLimit-Reset, and page with `created_before` and `limit` up to 100

### TaxCloud

1. Send `X-API-KEY` on every call and put the connection ID in the path, as in `/tax/connections/{connectionId}/carts`. A wrong ID returns 404
2. Mark nexus states active in the account first. With none active the API returns zero tax and no error
3. Use a separate test connection. There is no sandbox, and orders on a live connection go into filing
4. Pass a stable `idempotencyKey` on refunds, and never convert the same cart twice. A second conversion creates a duplicate liability
5. Void a wrong order before 12:00 AM Eastern on the 10th of the month after its `completedDate`. Later requests return 422

## Questions

### Which is better for AI agents, Quaderno or TaxCloud?

Quaderno scores 59.5 (C) on agent readiness against TaxCloud's 57.4 (C), and leads in 3 of 7 scored categories. TaxCloud leads on agent ergonomics, security & auth and maintenance & community.

### Do Quaderno and TaxCloud need an API key?

Quaderno takes an API key or an OAuth sign-in. TaxCloud needs an API key.

### Can an agent call Quaderno and TaxCloud without installing anything?

Yes. Quaderno has a hosted endpoint at https://quadernoapp.com/api and TaxCloud at https://api.v3.taxcloud.com.


## For agents

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

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