Head to head · Tax calculate · October 2026 research run
Anrok vs Quaderno
Anrok scores 61.6 (C) on agent readiness against Quaderno's 59.5 (C), and leads in 3 of 7 scored categories. Quaderno leads on schema & documentation, payments & pricing and transparency & trust. Both do tax calculate.
Which one, for what
Anrok C
Good for An agent working for a software or ecommerce seller that already uses Anrok and wants calculation, exemption certificates and filing status in one account.
Ahead on
- Agent ergonomics, 70 against 56
- Security & auth, 59 against 39
- Maintenance & community, 47 against 28
Watch for
No self-serve signup. Starter is $100 per market a month through "Talk to us", and Custom is quoted by sales
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
- Schema & documentation, 77 against 71
- Payments & pricing, 30 against 15
- Transparency & trust, 76 against 54
Watch for
One API key reads and writes everything its user can reach. Scopes exist only on Connect OAuth tokens (read_only, read_write)
Score by category
| Category | Weight this run | Anrok | Quaderno | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 88 | 91 | Quaderno +3 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 71 | 77 | Quaderno +6 |
| Agent ergonomics | 13%16.2 | 70 | 56 | Anrok +14 |
| Security & auth | 14%17.5 | 59 | 39 | Anrok +20 |
| Payments & pricing | 10%12.5 | 15 | 30 | Quaderno +15 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 47 | 28 | Anrok +19 |
| Transparency & trust | 7%8.8 | 54 | 76 | Quaderno +22 |
| Negative events | ≤15 | 0 | 0 | |
| Total | 61.6 · C | 59.5 · C |
Facts side by side
| Fact | Anrok | Quaderno |
|---|---|---|
| Kind | HTTP API | HTTP API |
| Vendor | Anrok, Inc. | Recrea Systems, SL |
| Hosted endpoint | https://api.anrok.com | https://quadernoapp.com/api |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Proprietary service under the Anrok SaaS Services Agreement. The OpenAPI file states "All rights reserved" | Proprietary service under Quaderno's terms of service. The Ruby library on GitHub is MIT |
| Tools exposed | 31 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-06 | 2026-07-04 |
| Terms last updated | 2026-07-01 | 2026-09-15 |
| Privacy policy last updated | 2026-07-01 | 2024-05-16 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | yes |
| 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 | none | 15 stars |
Verdicts
Anrok
The public OpenAPI 3.1 spec covers 26 operations with typed error codes, and the remote MCP server uses OAuth 2.1 with six scopes and keeps voids, refunds and filing approval away from the model. Access needs a seller account arranged through sales, API keys carry no scopes, and no API changelog, SDK or subprocessor list was found.
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.
Before you call either
Anrok
- Send every call as a POST with a JSON body to https://api.anrok.com, including reads such as /v1/seller/products/list
- Call createEphemeral for a quote and createOrUpdate only when the invoice is final. createOrUpdate saves the transaction for filing
- Reuse the same transaction id on a retry. createOrUpdate overwrites by id, so a repeat doesn't create a second record
- Expect transactionFrozenForFiling once a transaction is on a filed return. Negate it with createNegation and write a new id with a suffix such as :s2
- On 429 wait the number of seconds in Retry-After. The default limit is 10 requests a second per seller account
Quaderno
- Call GET https://quadernoapp.com/api/authorization first. Its
hrefgives the account subdomain that every other call needs - Before retrying a failed POST /transactions, list invoices by
processor_idto check whether the sale was recorded. There is no idempotency key - Treat GET /invoices/{id}/deliver as a write. It emails the invoice to the customer
- Correct a final invoice with a credit note. DELETE on invoices returns 410 and PUT accepts only notes, tags, metadata and address fields
- Read X-RateLimit-Remaining and X-RateLimit-Reset, and page with
created_beforeandlimitup to 100
Questions
Which is better for AI agents, Anrok or Quaderno?
Anrok scores 61.6 (C) on agent readiness against Quaderno's 59.5 (C), and leads in 3 of 7 scored categories. Quaderno leads on schema & documentation, payments & pricing and transparency & trust.
Do Anrok and Quaderno need an API key?
Both take an API key or an OAuth sign-in.
Can an agent call Anrok and Quaderno without installing anything?
Yes. Anrok has a hosted endpoint at https://api.anrok.com and Quaderno at https://quadernoapp.com/api.
Other comparisons with Anrok or Quaderno
Machine-readable
- This page as Markdown
/compare/anrok-vs-quaderno.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/anrok.json·/api/v1/tools/quaderno.json - From a terminal
anchor compare anrok quaderno(the CLI) - Over MCP
compare_tools {"a": "anrok", "b": "quaderno"}at/mcp, no key