# Fonoa vs Quaderno (slim)

> Quaderno scores 59.5 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 4 of 7 scored categories. Fonoa leads on agent ergonomics, security & auth and maintenance & community. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/fonoa-vs-quaderno.md (~2,150 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/fonoa-vs-quaderno.json · canonical https://www.anchorterminal.com/compare/fonoa-vs-quaderno
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Quaderno scores 59.5 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 4 of 7 scored categories. Fonoa leads on agent ergonomics, security & auth and maintenance & community. Both do tax calculate.

- Fonoa: D 51.7, rank #575 of 722 · https://www.anchorterminal.com/tools/fonoa.min.md
- Quaderno: C 59.5, rank #427 of 722 · https://www.anchorterminal.com/tools/quaderno.min.md
- Fonoa, good for An agent working for a company that already has a Fonoa contract and needs tax ID validation, VAT or GST calculation, or e-invoice reporting across many countries through one API. Ahead on Agent ergonomics, 64 against 56; Security & auth, 47 against 39; Maintenance & community, 49 against 28.
- Quaderno, 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; Schema & documentation, 77 against 68; Payments & pricing, 30 against 3; Transparency & trust, 76 against 48.

| Category | Fonoa | Quaderno |
| --- | --- | --- |
| Reliability (16%) | 66 | 91 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 68 | 77 |
| Agent ergonomics (13%) | 64 | 56 |
| Security & auth (14%) | 47 | 39 |
| Payments & pricing (10%) | 3 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 49 | 28 |
| Transparency & trust (7%) | 48 | 76 |

| Fact (where they differ) | Fonoa | Quaderno |
| --- | --- | --- |
| Vendor | Fonoa Technologies Limited | Recrea Systems, SL |
| Hosted endpoint | `https://api.fonoa.com` | `https://quadernoapp.com/api` |
| Auth | API key | OAuth or key |
| Licence | Proprietary service. The API contract is not published. The public Terms of Service took effect on 14 May 2020 and name older seller sites | Proprietary service under Quaderno's terms of service. The Ruby library on GitHub is MIT |
| Last release | 2026-10-02 | 2026-07-04 |
| Terms last updated | no document linked | 2026-09-15 |
| Privacy policy last updated | no date given | 2024-05-16 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | none | 15 stars |