# Rillet vs Zest: who uses which

On usedby, 20 companies use Rillet 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 2026-10-08: 38 of 48 public lines checked.

## Side by side

|  | [Rillet](https://www.usedby.ai/tools/rillet.md) | [Zest](https://www.usedby.ai/tools/zest.md) |
|---|---|---|
| Public customers | 20 | 28 |
| Confirmed | 9 | 18 |
| Observed | 11 | 10 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | DevTools & Infrastructure (1), Fintech & Payments (1), HR & Recruiting (1) | Banking & Mortgages (23) |
| Category | Finance & Accounting AI | Finance & Accounting AI |
| Security | SOC 2 Type II ([rillet.com](https://www.rillet.com/product/security-and-permissions), checked 2026-10-08) | — |
| Integrations | Salesforce, HubSpot, Stripe, Ramp, Brex, Expensify, BILL, Avalara, Rippling, Deel, Chargebee, Mercury ([rillet.com](https://www.rillet.com/product/native-integrations), checked 2026-10-08) | — |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Rillet: [Postscript](https://www.usedby.ai/case-studies/postscript-rillet.md): **3 days**: “Postscript's close is now consistently 3 days.” (captured by usedby 2026-10-08)
- Rillet: [Halcyon](https://www.usedby.ai/case-studies/halcyon-rillet.md): story without a checked figure. (captured by usedby 2026-10-08)

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