# Basis vs Zest: who uses which

On usedby, 18 companies use Basis and 28 use Zest. No company is listed with both yet. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side. Latest check 2026-10-07: 36 of 46 public lines checked.

## Side by side

|  | [Basis](https://www.usedby.ai/tools/basis.md) | [Zest](https://www.usedby.ai/tools/zest.md) |
|---|---|---|
| Public customers | 18 | 28 |
| Confirmed | 4 | 18 |
| Observed | 14 | 10 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | Accounting & Audit (1) | Banking & Mortgages (23) |
| Category | Finance & Accounting AI | Finance & Accounting AI |
| Security | SOC 2 Type II, ISO 27001, ISO 42001 ([getbasis.ai](https://www.getbasis.ai/security), checked 2026-10-07) | — |
| Data residency | United States ([getbasis.ai](https://www.getbasis.ai/security), checked 2026-10-07) | — |
| Your data | Not used to train models by default. ([getbasis.ai](https://www.getbasis.ai/security), checked 2026-10-07) | — |
| Data processing terms | A data processing agreement is available. ([getbasis.ai](https://www.getbasis.ai/legal/privacy-policy), checked 2026-10-07) | — |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Basis: [Boyum Barenscheer](https://www.usedby.ai/case-studies/boyum-barenscheer-basis.md): story without a checked figure. (captured by usedby 2026-10-07)

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Source: https://www.usedby.ai/compare/basis-vs-zest · How we check: https://www.usedby.ai/methodology