NOI vs Skyflow: LLM Privacy Protection Compared [2026]
See how NOI stacks up against its alternative, Skyflow
NOI vs Skyflow: LLM Privacy Proxy vs Data Privacy Vault
Introduction
Skyflow is a well-funded, general-purpose data privacy vault with LLM capabilities. NOI is a purpose-built LLM privacy proxy that deploys in minutes. Both tokenize sensitive data. The architectures and integration paths differ significantly.
Product Overviews
NOI
NOI is a PII-tokenizing reverse proxy for LLM API traffic built by Enigma Vault. It detects sensitive data in prompts, replaces it with deterministic tokens, forwards a sanitized request to the model provider, and restores real values in the response. Integration requires changing the base_url in your existing OpenAI SDK client. Built on PCI Level 1 certified infrastructure. Free tier: 1M tokens/month, no credit card.
Skyflow
Skyflow is a data privacy vault company offering a zero-trust vault architecture for isolating, protecting, and governing sensitive data. Its LLM Privacy Vault extends this to LLM use cases with PII detection via a configurable sensitive data dictionary, tokenization or masking, and detokenization for authorized users. Skyflow uses polymorphic encryption and fine-grained access controls. Supports data residency in 150+ countries. Raised $30M+ from Khosla Ventures. Founded in 2019, headquartered in Palo Alto. SOC 2 Type 1 and 2, PCI Level 1, ISO 27001 compliant.
Feature-by-Feature Comparison
| Feature | NOI | Skyflow |
|---|---|---|
| Primary Focus | Dedicated LLM API privacy proxy. | General-purpose data privacy vault with LLM features. |
| Integration Method | Transparent reverse proxy. Change base_url. Two lines of code. | API-based. Requires vault setup, dictionary configuration, app-level integration. |
| Deployment Speed | Minutes. No vault setup or dictionary needed. | Weeks. Skyflow reports enterprise deployments in "less than three weeks." |
| Tokenization Approach | Deterministic tokenization. Vault-backed. | Polymorphic encryption and tokenization. Deterministic and format-preserving. |
| Data Residency | AWS Fargate. Configurable per deployment. | Global: 150+ countries via cloud-agnostic vault architecture. |
| Scope Beyond LLMs | Focused on LLM API traffic. Not a general-purpose vault. | Broad: PCI tokenization, PII vaulting, payments, healthcare data, plus LLM features. |
| Compliance Certifications | PCI Level 1, ISO 27001, HIPAA/GDPR/SOX ready. | SOC 2 Type 1 & 2, PCI Level 1, ISO 27001, HIPAA, GDPR. |
| Fail-Safe Behavior | Default-block. If tokenization fails, request is blocked. | Not prominently documented as default-block for LLM use cases. |
| Context Phrase Neutralization | Yes. Prevents LLM safety refusals on tokenized data. | Not documented as a feature. |
| SSE Streaming | Yes. Native SSE for OpenAI and Anthropic. | Not prominently documented for LLM streaming. |
| Pricing | Free: 1M tokens/month. Pro: $50/mo. Enterprise: custom. | Custom pricing. No public free tier for LLM use cases. |
The Verdict
If your primary need is protecting LLM API prompts and responses with the fastest possible integration, NOI is the more targeted solution. If you need a general-purpose data privacy vault that also handles payments, PCI compliance, global data residency across 150+ countries, and LLM privacy as one of several capabilities, Skyflow offers that breadth.
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Frequently Asked Questions
Partially. Skyflow is a general-purpose data privacy vault that has added LLM features through its LLM Privacy Vault. NOI is built specifically for LLM API traffic protection as a reverse proxy. They overlap on PII tokenization for LLM use cases, but Skyflow serves a much broader set of data privacy needs including payments, PCI compliance, and global data residency.
No. Skyflow requires API-based integration with vault setup and sensitive data dictionary configuration. This typically takes weeks for enterprise deployments. NOI deploys by changing a single base_url parameter in your existing OpenAI SDK client, requiring no vault setup and no dictionary configuration.
Both are strong. Skyflow holds SOC 2 Type 1 and 2, PCI Level 1, ISO 27001, HIPAA, and GDPR compliance. NOI is built on PCI Level 1 certified infrastructure (Enigma Vault) with ISO 27001, HIPAA, GDPR, and SOX readiness. Both can satisfy enterprise security reviews.
NOI. It is purpose-built for this use case, with a transparent proxy architecture that requires no vault setup, no dictionary configuration, and no application code changes beyond swapping the base URL. Skyflow is more appropriate if you also need a broader data privacy vault.
NOI offers a free tier with 1M protected tokens per month, all providers, and no credit card required. Skyflow does not publicly offer a free tier for LLM use cases. Skyflow pricing is custom and contact-sales, which typically means enterprise-tier pricing.
NOI is more practical for startups. The free tier (1M protected tokens per month, no credit card) and one-line integration mean you can add PII protection in minutes without a procurement process. Skyflow is better suited for enterprises that need a comprehensive AI data governance platform.