# Black Ore vs Fieldguide: who uses which

On usedby, 3 companies use Black Ore and 36 use Fieldguide. 1 company uses both, including Withum. Counts include every proof level, job-post signals included; each company keeps its proof level on each side. Latest check 2026-10-19: 39 of 39 public lines checked.

## Side by side

|  | [Black Ore](https://www.usedby.ai/tools/black-ore.md) | [Fieldguide](https://www.usedby.ai/tools/fieldguide.md) |
|---|---|---|
| Public customers | 3 | 36 |
| Confirmed | 0 | 7 |
| Observed | 3 | 29 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers (every proof level) | Accounting & Audit (2), Management Consulting (1) | Accounting & Audit (32), Cybersecurity (2), Management Consulting (1) |
| Category | Finance & accounting AI | Finance & accounting AI |
| Data processing terms | — | A data processing agreement is available. ([fieldguide.com](https://www.fieldguide.com/trust), checked 2026-10-08) |

## Companies that use both

Every proof level counts; the proof level of each side is shown, strongest proofs first. The first public proof is not an adoption date.

| Company | Proof, Black Ore | Proof, Fieldguide | First public proof, Black Ore | First public proof, Fieldguide |
|---|---|---|---|---|
| [Withum](https://www.usedby.ai/companies/withum.md) | Observed | Observed | On or before October 2026 | On or before September 2026 |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Fieldguide: [Holbrook & Manter](https://www.usedby.ai/case-studies/holbrook-manter-fieldguide.md): **35-50%**: “Holbrook & Manter’s teams are already saving 35-50% in hours per engagement.” (captured by usedby 2026-10-07)
- Fieldguide: [BerryDunn](https://www.usedby.ai/case-studies/berrydunn-fieldguide.md): **75%**: “helping reduce the amount of on-site travel by 75%” (captured by usedby 2026-10-07)

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Source: https://www.usedby.ai/compare/black-ore-vs-fieldguide · How we check: https://www.usedby.ai/methodology