# Numeral vs Quaderno

> Quaderno scores 59.5 (C) on agent readiness against Numeral's 49.3 (D), and leads in 3 of 7 scored categories. Numeral leads on schema & documentation, agent ergonomics, security & auth and maintenance & community. Both do tax calculate. Category scores, facts, verdicts and…

- Canonical: https://www.anchorterminal.com/compare/numeral-vs-quaderno
- Markdown: https://www.anchorterminal.com/compare/numeral-vs-quaderno.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/numeral-vs-quaderno.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/numeral-vs-quaderno.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 Numeral's 49.3 (D), and leads in 3 of 7 scored categories. Numeral leads on schema & documentation, agent ergonomics, security & auth and maintenance & community. Both do tax calculate.

- Numeral: grade D, 49.3/100, rank #611 of 722. Markdown https://www.anchorterminal.com/tools/numeral.md · JSON https://www.anchorterminal.com/api/v1/tools/numeral.json
- 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

## Which one, for what

### Numeral (D)

Good for: An agent working for a seller or platform that has a Numeral account and needs tax at checkout, committed transactions for filing, and read access to nexus, registrations and filings through MCP.

Ahead on:
- Schema & documentation, 87 against 77
- Agent ergonomics, 71 against 56
- Security & auth, 47 against 39
- Maintenance & community, 60 against 28

Watch for: No status page, uptime SLA or numeric rate limit was found. The product page says rate limits can be removed on request

### 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 25
- Payments & pricing, 30 against 10
- Transparency & trust, 76 against 45

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 | Numeral | Quaderno | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 25 | 91 | Quaderno +66 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 77 | Numeral +10 |
| Agent ergonomics | 13% (16.2 this run) | 71 | 56 | Numeral +15 |
| Security & auth | 14% (17.5 this run) | 47 | 39 | Numeral +8 |
| Payments & pricing | 10% (12.5 this run) | 10 | 30 | Quaderno +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 60 | 28 | Numeral +32 |
| Transparency & trust | 7% (8.8 this run) | 45 | 76 | Quaderno +31 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **49.3 · D** | **59.5 · C** | |

## Facts side by side

| Fact | Numeral | Quaderno |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Numeral Two, Inc. | Recrea Systems, SL |
| Hosted endpoint | `https://api.numeralhq.com` | `https://quadernoapp.com/api` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | API key | OAuth or key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Proprietary service under Numeral's terms of service. The Go, Python and Node SDKs are Apache-2.0 | Proprietary service under Quaderno's terms of service. The Ruby library on GitHub is MIT |
| Tools exposed | 14 | none |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-09-15 | 2026-07-04 |
| Terms last updated | no date given | 2026-09-15 |
| Privacy policy last updated | no document linked | 2024-05-16 |
| 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 | not found in the text | yes |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 0 stars, 9 npm/wk, 19 PyPI/wk | 15 stars |

## Verdicts

**Numeral.** Docs are written for agents, with a public OpenAPI spec for 32 operations, Markdown pages, llms.txt and a remote MCP server whose 14 tools are read-only by default. No status page, numeric rate limit or SLA was found, the API ignores idempotency keys, and API access is sold on a custom plan after a demo.

**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

### Numeral

1. Send `X-API-Version: 2026-03-01` on every call to `https://api.numeralhq.com`. Merchant, platform and certificate endpoints reject requests without it
2. Commit with a stable `reference_order_id`. On `REFERENCE_ORDER_ID_ALREADY_EXISTS` look up the existing transaction, because `Idempotency-Key` is ignored
3. Commit before the calculation's `expires_at`. If it has expired, calculate again and commit the new `calculation_id` with the original `reference_order_id`
4. Send `amount` as the line total in minor units to `/tax/calculations` and as the per-unit price to `/tax/platform/calculations`
5. Start with an `sk_test_` key. Certificate endpoints and MCP certificate tools are live only and answer `TESTMODE_NOT_SUPPORTED` or `live_mode_required`

### 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

## Questions

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

Quaderno scores 59.5 (C) on agent readiness against Numeral's 49.3 (D), and leads in 3 of 7 scored categories. Numeral leads on schema & documentation, agent ergonomics, security & auth and maintenance & community.

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

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

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

Yes. Numeral has a hosted endpoint at https://api.numeralhq.com and Quaderno at https://quadernoapp.com/api.


## For agents

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

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