# Quaderno vs Vertex O Series (slim)

> Quaderno scores 59.5 (C) on agent readiness against Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on 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/quaderno-vs-vertex-tax.md (~2,000 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/quaderno-vs-vertex-tax.json · canonical https://www.anchorterminal.com/compare/quaderno-vs-vertex-tax
- 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 Vertex O Series's 54.7 (C), and leads in 5 of 7 scored categories. Vertex O Series leads on security & auth and maintenance & community. Both do tax calculate.

- Quaderno: C 59.5, rank #377 of 629 · https://www.anchorterminal.com/tools/quaderno.min.md
- Vertex O Series: C 54.7, rank #464 of 629 · https://www.anchorterminal.com/tools/vertex-tax.min.md
- 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 65; Agent ergonomics, 56 against 51; Payments & pricing, 30 against 0; Transparency & trust, 76 against 68.
- Vertex O Series, good for An agent working inside a company that already has an O Series licence, for quotes, invoice tax, tax area lookups and tax configuration across sales tax, use tax and VAT. Ahead on Security & auth, 57 against 39; Maintenance & community, 62 against 28.

| Category | Quaderno | Vertex O Series |
| --- | --- | --- |
| Reliability (16%) | 91 | 65 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 74 |
| Agent ergonomics (13%) | 56 | 51 |
| Security & auth (14%) | 39 | 57 |
| Payments & pricing (10%) | 30 | 0 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 28 | 62 |
| Transparency & trust (7%) | 76 | 68 |

| Fact (where they differ) | Quaderno | Vertex O Series |
| --- | --- | --- |
| Vendor | Recrea Systems, SL | Vertex, Inc. |
| Hosted endpoint | `https://quadernoapp.com/api` | `https://calcconnect.vertexsmb.com/vertex-ws/v2` |
| Auth | OAuth or key | OAuth |
| Licence | Proprietary service under Quaderno's terms of service. The Ruby library on GitHub is MIT | Proprietary service under a customer agreement with Vertex, Inc. that isn't published |
| llms.txt | yes | no |
| Last release | 2026-07-04 | 2026-09-25 |
| Terms last updated | 2026-09-15 | no date given |
| Privacy policy last updated | 2024-05-16 | no date given |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Popularity | 15 stars | none |