Skyflow popularized the "data privacy vault" pattern: instead of scattering sensitive fields across your databases and microservices, you route them into an isolated, access-controlled vault and work with tokens everywhere else. It's a well-regarded architecture for engineering teams building data pipelines, checkout flows, or LLM applications that need to keep raw PII out of systems that don't strictly need it. But the model still depends on a vault — your sensitive data has to be sent somewhere, encrypted and tokenized under Skyflow's infrastructure (or a Bring-Your-Own-Cloud deployment of it), so it can be detokenized on demand later. anonym.plus takes the opposite approach to a different problem: rather than managing where PII lives after it's collected, it removes PII from a document before the document ever leaves your machine. Nothing is vaulted, because nothing is sent anywhere to be vaulted. The two tools solve adjacent but distinct problems — Skyflow secures PII flowing through live systems and APIs; anonym.plus anonymizes documents and files that a person or team needs to share, upload, or feed into an AI tool without exposing the original data at all.
Feature Comparison
Competitor data from Skyflow's public product pages and developer documentation, 2026 — verify before relying. Skyflow does not publish full pricing; figures below reflect its disclosed pricing factors, not confirmed rates.
| Feature | anonym.plus | Skyflow |
|---|---|---|
| Data leaves your device | Never (100% on-device) | Yes — sensitive data is sent via API into Skyflow's vault for tokenization/encryption |
| Deployment | Desktop app (Windows/macOS/Linux), fully local | Cloud API/service — multi-tenant SaaS, Virtual Private Skyflow, or Bring-Your-Own-Cloud |
| Offline / air-gap capable | Yes — runs with no internet connection | No — every tokenize/detokenize/detect call requires reaching the vault API |
| Entity types / scope | 340+ PII entity types detected automatically in documents | Not a document PII detector — secures whatever structured fields (name, SSN, card number, etc.) you define in your vault schema |
| Encryption | Local AES-256-GCM, offline key vault | Patented polymorphic encryption + tokenization inside Skyflow's vault; Bring-Your-Own-Key (BYOK) supported |
| Account / login required | No account for core anonymization | Yes — requires a Skyflow account and a provisioned vault |
| Pricing model | One-time license, no subscription | Usage-based / enterprise: platform fee plus data-subject volume and region, custom quotes |
| Setup / DevOps | None — install and run (bundles Presidio + spaCy) | Developer integration required: define a vault schema, integrate the API/SDK, wire up policies and connectors |
| Compliance angle | Reduces exposure by never transmitting source documents in the first place | Governance and tokenization layer supporting HIPAA, PCI DSS, GDPR, DPDP, and CCPA/CPRA for data already flowing through your systems |
| Data residency / cross-border transfer | Not applicable — no data is transmitted, so GDPR Art. 44-49 transfer-mechanism questions do not arise | Region-specific vault instances are available, but cross-border questions still apply whenever the vault's region differs from where data subjects are located |
| Billing granularity | One-time per-seat license; cost is fixed regardless of data volume | Platform fee plus usage tied to data-subject volume and region — cost grows with scale |
Skyflow Strengths
- Patented polymorphic encryption lets some operations (aggregation, comparison) run on encrypted data without decrypting it first
- Flexible tokenization types — random, format-preserving, and deterministic — that keep tokenized data usable in downstream systems
- Fine-grained governance combining role-based and attribute-based access control (PBAC), including dynamic masking based on who's asking (e.g., showing only the last four digits of a card)
- Multiple deployment/isolation models (multi-tenant SaaS, Virtual Private Skyflow, BYOC) to match different compliance postures
- Broad connector ecosystem (70+ integrations, including Stripe, Snowflake, and Salesforce) for wiring the vault into existing data pipelines
- SOC 2, HIPAA, and PCI DSS compliance credentials aimed at regulated industries (fintech, healthcare, travel, retail)
Skyflow Limitations
- The vault is the product — sensitive data must be sent to Skyflow's infrastructure (or your BYOC deployment of it) to be protected; it never stays purely on your own device
- Built for structured fields inside pipelines and applications, not for anonymizing arbitrary documents (PDFs, DOCX, scans) a person needs to share or upload
- Requires real developer integration: schema design, API/SDK work, and policy configuration before any data is protected — not a point-and-click tool
- Pricing is usage-based and not fully public — expect a custom quote tied to platform fees, data-subject volume, and region
- Even with polymorphic encryption and BYOK, the vault operator's infrastructure and API become part of your compliance and trust boundary
Why Choose anonym.plus
- 100% on-device processing — no document content ever leaves your machine, so there's no vault to provision, trust, or breach
- 340+ PII entity types detected locally, built on Microsoft Presidio + spaCy
- Works fully offline — disconnect the network and it still runs
- Local AES-256-GCM encryption with an offline key vault, entirely under your control
- One-time license — no subscription, no usage-based billing, no data-subject counting
- No account required for core anonymization; internet is only needed once, for license activation
- No document data egress by design — verifiable by running the app fully offline on an air-gapped machine
- Zero setup or DevOps — no schema to design, no API to integrate; the detection engine is bundled, just install and run
Your data never leaves your device — there is nothing to breach, no data center, and no jurisdiction to trust.
How the data flows: vault vs local processing
Skyflow and anonym.plus solve privacy from opposite directions. A data privacy vault, as Skyflow defines the category, is a system that ingests sensitive field values, stores them in an isolated environment, and returns non-sensitive tokens for use everywhere else. anonym.plus never ingests anything anywhere — it processes a document where it already sits, on your device, and nothing is stored or transmitted afterward.
Skyflow's tokenize/detokenize flow
- Your application captures a sensitive field at the point of collection — a card number, SSN, or name entered into a form or API request
- That value is sent via API call to Skyflow's vault — multi-tenant SaaS, a Virtual Private Skyflow instance, or a Bring-Your-Own-Cloud deployment your team provisions and operates
- The vault tokenizes and encrypts the value using Skyflow's polymorphic encryption, then returns a token that your systems store and use instead of the raw value
- When an authorized process later needs the real value, it calls the vault's detokenize endpoint, and the vault returns the original — meaning the sensitive value is retained indefinitely inside the vault, by design
anonym.plus's local anonymization flow
- You open a document — PDF, DOCX, or scanned image — directly in the desktop app on your own machine; there is no capture or ingestion step to a separate system
- The bundled detection pipeline (Microsoft Presidio + spaCy) locates 340+ PII entity types inside the document's local memory representation
- Matched spans are redacted, masked, or replaced directly in the output file — no token is issued because no vault exists to redeem it against
- If you choose reversible pseudonymization, the mapping is held in a local AES-256-GCM-encrypted vault file on your device, not a server anyone else operates
Skyflow's model is defined by retention: the whole point of a vault is that the original sensitive value is kept, safely, so it can be retrieved later. anonym.plus's model is defined by removal: the point is that the original value doesn't need to be kept anywhere outside the document you already control, because there's no live system depending on retrieving it later.
When Skyflow makes sense vs when anonym.plus wins
Skyflow is the right tool when
- A fintech or healthcare engineering team needs to reduce PCI DSS or HIPAA scope across a live production system — for example, replacing card numbers in a checkout pipeline with tokens so most services never touch raw card data
- The workflow needs dynamic, role-based masking — showing a support agent only the last four digits of a card while a billing service detokenizes the full number
- Sensitive fields need to flow through many connected systems (70+ connectors including Stripe, Snowflake, and Salesforce, per Skyflow's own documentation), and tokens need to remain format-preserving so downstream code doesn't break
- The organization has engineering capacity to design a vault schema, integrate an SDK, and operate ongoing infrastructure or a managed subscription
anonym.plus is the right tool when
- A single professional needs to anonymize a batch of documents — scanned contracts, medical records, HR files — before sharing them, with no live system or pipeline involved at all
- The environment is air-gapped or network-restricted by policy, so no outbound API call — to any vault, anywhere — is permitted
- There's no ongoing need to "detokenize" anything later, because the goal is a finished anonymized document, not a live reference to data still held somewhere else
- A fixed, one-time cost is preferred over a platform fee plus usage tied to data-subject volume and region
The key difference is not encryption strength — Skyflow's polymorphic encryption and anonym.plus's AES-256-GCM are both well-regarded cryptographic approaches. The key difference is whether the sensitive value continues to exist, retrievable, inside someone's infrastructure after the operation completes.
Data residency, cross-border transfer, and Schrems II
Under GDPR Articles 44-49, transferring personal data outside the EU/EEA requires an approved mechanism — an adequacy decision, Standard Contractual Clauses, or another recognized safeguard. This requirement is triggered by one fact: personal data leaving the EEA. Skyflow addresses this in part by offering region-specific vault instances, so a customer can choose to keep a vault's storage location inside a given jurisdiction.
That does not remove the underlying legal question, though — it relocates it. In Schrems II (CJEU, Case C-311/18, judgment of 16 July 2020), the Court of Justice invalidated the EU-US Privacy Shield, ruling that U.S. surveillance law failed to offer protection essentially equivalent to the GDPR for personal data transferred to U.S. infrastructure. Any vault deployment whose region, sub-processors, or support access spans a jurisdiction different from where the data subjects are located still needs to satisfy Articles 44-49 and, per Schrems II, demonstrate supplementary safeguards beyond contractual clauses alone.
anonym.plus is not subject to this analysis at all, because no personal data is transmitted to any vault, region, or third-party infrastructure in the first place. The document stays on the device where the person doing the work already has lawful access to it. There is no transfer to authorize, because there is no transfer.