---
title: "Locke vs Nightfall AI"
description: "Nightfall AI offers centralised, AI-native DLP across cloud apps. Locke detects sensitive data on the device with a zero-knowledge model. How the two approaches differ — verify specifics with each vendor."
url: "https://sonomos.ai/compare/sonomos-vs-nightfall-ai/"
source: "https://sonomos.ai/compare/sonomos-vs-nightfall-ai/"
---

# Locke vs Nightfall AI

Nightfall AI is an established AI-native data security and DLP platform, known for high-accuracy detection across a wide set of integrated SaaS apps. It has extended into browser-based AI controls aimed at exfiltration. It's a strong fit for organisations that want centralised, server-side detection and an auditable record across their cloud estate. The core difference: Nightfall's detection model inspects content the platform can see, so content is evaluated by the vendor's service instead of staying entirely on the user's device. (Vendor capabilities change quickly. Details here are category-level as of 2026; verify specifics with Nightfall directly.)

## When Nightfall AI fits

- You want a mature, centrally managed DLP platform with broad SaaS integration coverage and an auditable detection record.
- Your security team prefers server-side detection and centralised policy management over per-device controls.
- You need data discovery and classification across many cloud applications, not only the AI-prompt path.

## When Locke fits

- You want detection to run entirely on the device, with no prompt content evaluated by an external service.
- Zero-knowledge is a hard requirement: the privacy layer itself should never see your data.
- You want a low-cost entry point: the Locke Early Access desktop app, free for one person.

## Side-by-side

| Dimension | Locke | Nightfall AI |
| --- | --- | --- |
| Where detection runs | Entirely on the device, before any network call. | Centralised, AI-native detection across integrated apps and traffic. |
| Trust model | Zero-knowledge: the vendor never sees prompt content. | Content is evaluated by the platform to enforce policy. |
| Primary scope | Sensitive data in AI prompts, masked before it leaves the device. | Broad data security and DLP across SaaS, with AI controls added. |
| Entry point | Locke Free costs nothing (Early Access); Teams starts at $14.99 per seat a month. | Commercial platform. Contact vendor for current pricing. |
| Best for | Local-first, zero-knowledge control over AI prompts. | Centralised, AI-native DLP across a cloud-app estate. |

## Bottom line

Nightfall AI is a capable, broad data-security platform with strong centralised detection. Locke is narrower and deliberately local: detection runs on the device, the privacy layer never sees your data, and the entry point is free. For centralised cloud DLP, Nightfall is a serious option. If local-first and zero-knowledge are non-negotiable, look at Locke. Compare current capabilities with the vendor before deciding.

[Download Locke](https://sonomos.ai/downloads/)[See the Locke demo](https://sonomos.ai/locke/#demo)[See pricing](https://sonomos.ai/pricing/)[Talk to the team](https://sonomos.ai/contact/)

## Related comparisons

- [Locke vs Private AI](https://sonomos.ai/compare/sonomos-vs-private-ai/)
- [Locke vs Strac](https://sonomos.ai/compare/sonomos-vs-strac/)
- [Locke vs Cyberhaven](https://sonomos.ai/compare/sonomos-vs-cyberhaven/)

[View all comparisons](https://sonomos.ai/compare/)

## Further reading

- [The Best AI Privacy Tools for ChatGPT, Claude, and Gemini (2026)](https://sonomos.ai/blog/best-ai-privacy-tools-chatgpt-claude-gemini-2026/)
- [AI Data Leakage: 7 Ways Sensitive Information Escapes to LLMs (and How to Stop It)](https://sonomos.ai/blog/ai-data-leakage-7-ways-sensitive-info-escapes-to-llms/)
- [What Is PII Redaction? A Plain-English Guide for AI Users](https://sonomos.ai/blog/what-is-pii-redaction-ai/)