EU-sovereign AI DLP vs US-hosted AI DLP
ZeusLock vs Nightfall: which AI DLP is right for European enterprises?
Both ZeusLock and Nightfall protect sensitive data from leaking to ChatGPT, Claude and Gemini. The differences come down to hosting jurisdiction, agent coverage and pricing — here is a fact-by-fact breakdown for buying teams in 2026.
Both products belong to the modern AI DLP category — they protect prompts at the browser layer, redact sensitive data in real time, and provide audit evidence to compliance teams. The honest framing is that Nightfall is the strongest US-anchored AI DLP for US-headquartered buyers, and ZeusLock is the strongest EU-anchored AI DLP for European buyers under EU AI Act, NIS2, DORA or French sovereignty requirements — plus the only product covering MCP and CLI agents today.
AI surface coverage
Where each product enforces controls on the most-used GenAI surfaces, by what each vendor publishes on their own site.
| ZeusLock | Nightfall | |
|---|---|---|
| OpenAI ChatGPT | ||
| Anthropic Claude (claude.ai) | ||
| Google Gemini | ||
| Microsoft Copilot | ||
| MCP protocol | ||
| AI CLI tools (Claude Code, Cursor, Copilot CLI) | ||
| Built-in French / EU detectors (SIRET, INSEE, EU VAT) Nightfall ships a broader US-identifier detector library; French / EU defaults are typically configured custom rather than out of the box. | ||
| On-premise / air-gapped deployment |
How each product intercepts data
The architectural path a sensitive prompt takes from the user's keyboard to the AI model.
ZeusLock architecture
ZeusLock path- 1
User opens any browser (Chrome, Edge, Firefox) with the ZeusLock extension, or invokes a CLI / MCP agent on the workstation.
- 2
Prompt is inspected locally — sensitive substrings are anonymised in real time before transmission.
- 3
Sanitised prompt is delivered to ChatGPT, Claude, Gemini, Copilot or an MCP-connected tool.
- 4
Audit event is recorded in the ZeusLock console on AWS Paris (eu-west-3) — or on-premise with Sovereign Edition under French jurisdiction.
Nightfall architecture
Competitor path- 1
User opens a browser with the Nightfall extension installed, or transmits data through an API-integrated SaaS (Slack, GitHub, Salesforce, Jira, Zendesk).
- 2
Nightfall classifies the content against its detector library and applies configured policy in real time.
- 3
On policy hit, the action is blocked, redacted or logged depending on configuration.
- 4
Telemetry flows to Nightfall's US-hosted cloud control plane; EU-region deployment is available but vendor remains US-jurisdiction.
At a glance
| ZeusLock | Nightfall | |
|---|---|---|
| Hosting | EU (AWS Paris, eu-west-3) + on-premise Sovereign Edition | US (AWS / GCP) |
| CLOUD Act exposure | None on Sovereign Edition; mitigated by EU residency on SaaS | Yes — US entity, subject to CLOUD Act subpoenas |
| Browser extension | Yes (Chrome, Edge, Firefox) | Yes |
| CLI / MCP coverage | Yes — only DLP covering MCP + CLI agents | No |
| Starting price | €4 / user / month | ~$8 / user / month |
| GDPR DPA | Standard, EU jurisdiction | Available, US-anchored |
| EU AI Act / NIS2 / DORA alignment | Built-in compliance reporting | Coverage via generic DLP audit logs |
Detection coverage
Both products detect credit cards, API keys, JWTs, passwords and PII. ZeusLock adds source-code IP detection (proprietary code, internal class names, API surfaces) and ships with first-class detection rules for IBAN, French SIRET/SIREN, EU VAT numbers and NHS numbers — the defaults that matter to European auditors. Nightfall ships a wider catalog of US-centric identifiers (SSN, EIN, driver licence formats from 50 states).
Deployment & maintenance
ZeusLock browser extension installs in 2 minutes per user, mass-deployable via Google Workspace, Microsoft Intune or Active Directory GPO under an hour. Nightfall has parity here. ZeusLock additionally ships a desktop CLI agent and an MCP guard for AI agents — neither has a Nightfall equivalent. If you operate AI agents on developer workstations or CI/CD pipelines, ZeusLock covers them; Nightfall does not.
Compliance (GDPR / EU AI Act / NIS2 / DORA)
ZeusLock is built on European infrastructure and produces report templates aligned to GDPR, EU AI Act (Article 53 transparency obligations), NIS2 (incident reporting) and DORA (digital operational resilience). The Sovereign Edition runs entirely on-premise — data never leaves the customer’s infrastructure, removing CLOUD Act and FISA 702 risk for banking, defence, public-sector and healthcare buyers. Nightfall offers an EU-region deployment but remains a US entity.
Pricing model
ZeusLock Starter is €4 / user / month (100 detections / user / month, 30-day history). Business is €7 / user / month (300 detections, 90-day history). Enterprise is on quote with unlimited detections, 1-year retention and an SLA. Nightfall pricing starts at roughly $8 / user / month for the SaaS tier and scales steeply on volume — ZeusLock is roughly half the cost at comparable feature parity for European deployments.
When ZeusLock is the better choice
- ✓You need data residency in the EU (banking, defence, public sector, healthcare).
- ✓You operate AI agents on developer workstations or CI/CD pipelines (CLI + MCP coverage).
- ✓You need EU AI Act, NIS2 or DORA reporting templates out of the box.
- ✓Sovereignty matters — Sovereign Edition runs entirely on-premise with zero US-cloud dependency.
- ✓You want roughly half the per-seat cost of Nightfall for comparable feature parity.
When Nightfall is the better choice
- •Your user base is overwhelmingly US-based and US-identifier detection (SSN, EIN, US driver licences) is the priority.
- •You already have a Nightfall + Salesforce / Slack / GitHub integration footprint you do not want to migrate.
- •You do not run AI agents on CLI or via MCP — those vectors are not in scope.
Frequently asked questions
Is ZeusLock more EU-compliant than Nightfall?
Yes for sovereignty-sensitive buyers. ZeusLock is a French SASU operating from EU infrastructure with an on-premise Sovereign Edition that removes CLOUD Act exposure entirely. Nightfall is a US entity; even with EU-region deployment its parent company is subject to US legal process.
Does ZeusLock support the same SaaS integrations as Nightfall?
ZeusLock covers the GenAI surface (browser, desktop, CLI, MCP) first-class. Nightfall additionally has API-level integrations with Slack, GitHub, Jira, Salesforce and Zendesk. If those API integrations are critical, Nightfall has the wider catalog today. The ZeusLock REST API + webhooks let you wire equivalent flows but require integration work.
How does pricing compare in practice?
For 100 seats, ZeusLock Business runs €700 / month (€8.4k / year). Comparable Nightfall packages typically quote $14-18k / year at the same seat count, depending on detection volume and integrations. Enterprise tiers diverge further on volume.
Can ZeusLock detect prompt injection like Nightfall?
Yes — ZeusLock blocks known prompt-injection and jailbreak patterns on both outbound prompts and model responses, across web, CLI and MCP. It is currently the only AI DLP that covers prompt injection across the MCP protocol used by agentic systems.
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