The best on-premises application security testing platforms in 2026 are Ostorlab, Invicti Enterprise On-Premises, PortSwigger Burp Suite DAST, HCL AppScan, and OpenText Fortify. These solutions secure private web applications, APIs, source code, and mobile assets behind corporate firewalls through either locally deployed scan engines with cloud orchestration or fully self-hosted, customer-managed infrastructure.

Editorial disclosure

This comparison is published by Ostorlab and is based on publicly available first-party documentation. It does not represent an independent benchmark of vulnerability coverage, scan speed, false-positive rates, or deployment cost. Product capabilities, architecture, licensing, and data flows should be verified directly with each vendor.

On-premises application security testing platforms compared

Platform	Deployment model	Documented testing scope	Important distinction
Ostorlab	Local scanner with cloud-based management	Multi-asset coverage across web applications, APIs, networks, mobile applications, source code, and agentic assessments	Private targets are tested through an on-premises scanner, while orchestration and reporting remain cloud-managed.
Invicti Enterprise On-Premises	Customer-hosted enterprise DAST platform	Web applications and APIs	The application, scanning components, and management infrastructure are deployed within the customer environment.
Burp Suite DAST	Self-hosted enterprise DAST	Web applications and APIs	Organizations manage the DAST deployment and scan infrastructure within their environment.
HCL AppScan	Self-managed and private-site deployment options	DAST, SAST, SCA, and related AppSec workflows depending on product	Deployment and testing capabilities differ across AppScan Standard, Enterprise, and AppScan on Cloud.
OpenText Fortify	Customer-managed and hybrid enterprise AppSec options	SAST, DAST, SCA, and software-security governance	Capabilities are distributed across several Fortify products rather than one uniform platform.

The primary buying question is not simply whether a vendor uses the term “on-premises.” It is which components run locally, what information leaves the environment, and whether the resulting architecture satisfies the organization’s security and compliance requirements.

What is on-premises application security testing?

On-premises application security testing evaluates applications from infrastructure deployed within an organization’s network or another customer-controlled environment.

Organizations commonly use it to test:

• Internal web applications
• Private APIs
• Development and staging environments
• Applications accessible only through private networks
• Source-code repositories
• Mobile application packages
• Network services
• Systems restricted by regulatory or data-residency requirements

However, “on-premises” can describe several different architectures.

Deployment model	What runs locally	What may remain external
On-premises scanner	The scan engine that communicates with private targets	Management, scheduling, findings, or reporting
Hybrid platform	Selected scanners, connectors, or processing components	Central platform and orchestration
Self-hosted platform	Scanning, management, data storage, and reporting	Licensing or update services may still require connectivity
Air-gapped deployment	The complete platform and supporting services	No operational dependency on an external service

These models should not be treated as interchangeable. A locally deployed scanner can reach private assets, but that does not automatically mean all application data, findings, and platform functions remain inside the environment.

What organizations should evaluate

Deployment boundaries

Buyers should identify every component involved in the assessment:

• Scan engines
• Management consoles
• Databases
• Message queues
• Browser automation
• Dynamic-analysis infrastructure
• Source-code processing
• Reporting systems
• Update services
• AI or model endpoints

The vendor should explain where each component runs and how information moves between them.

Data processing and storage

Organizations should verify where the following data is processed and retained:

• Source code
• Application binaries
• Authentication credentials
• Session cookies and tokens
• HTTP requests and responses
• API specifications
• Vulnerability evidence
• Scan logs
• Findings and reports
• AI/agent interaction data

A platform may scan locally while still transmitting results or metadata to an external control plane. Whether that is acceptable depends on the organization’s threat model and compliance obligations.

Access to private targets

The platform should reach internal applications without requiring them to be exposed publicly.

A proof of value should test private DNS, internal certificate authorities, authenticated applications, segmented networks, proxies, and other controls present in the production environment.

Testing coverage

Deployment flexibility does not establish testing quality. Buyers should separately evaluate whether the proposed product supports the required combination of:

• Dynamic Application Security Testing
• Static Application Security Testing
• Software Composition Analysis
• API security testing
• Mobile application testing
• Network security scanning
• Authenticated assessment
• Agentic or multistep investigation (detailed targeted prompt)

A platform may provide strong on-premises DAST while requiring separate products for source-code or dependency testing.

Operations and maintenance

Self-hosting transfers operational responsibilities to the customer. These can include:

• Infrastructure sizing
• High availability
• Database administration
• Platform upgrades
• Scanner updates
• Backups
• Certificate management
• Monitoring
• Disaster recovery

A hybrid architecture reduces part of that burden but introduces an external platform dependency.

What did this comparison find?

On-premises does not have one standard meaning

The largest source of confusion is the phrase itself. A local scanner, a hybrid service, and a fully self-hosted platform solve different requirements even though vendors may describe all three as on-premises capabilities.

Architecture diagrams and documented data flows are more useful than the deployment label alone.

Private access and data sovereignty are separate requirements

A scanner can test an internal application while the platform still stores findings externally. Conversely, a fully self-hosted platform can keep assessment data local but require significantly more infrastructure and maintenance.

Buyers should evaluate target access and data control independently.

Testing breadth varies by product family

Some platforms concentrate on enterprise DAST. Others combine static, dynamic, dependency, mobile, network, or agentic testing through multiple products or scan profiles.

The comparison should therefore evaluate the exact components included in the proposed deployment rather than assuming that every capability advertised by the vendor is available on-premises.

Air-gapped support must be verified explicitly

A self-hosted installation is not necessarily air-gapped. Licensing, signature updates, telemetry, external callbacks, AI functions, or product upgrades may require connectivity.

Organizations with isolation requirements should test those dependencies before selection.

Platform evaluations

Ostorlab

Focus: Hybrid on-premises scanning with cloud-managed orchestration, reporting, and multi-asset coverage across web, API, mobile, network, and agentic assessments.

Ostorlab provides an On-Premises Scanner for assessing assets that are inaccessible from the public internet.

The scanner is deployed inside the customer environment and initiates an outbound connection to the Ostorlab platform. This allows it to receive scan tasks and assess private web applications, APIs, network assets, and other supported targets without opening inbound access to them.

The architecture is hybrid. Scanning originates from customer-controlled infrastructure, while configuration, orchestration, findings, and reporting are managed through the Ostorlab cloud platform. Organizations should therefore evaluate the information exchanged with the platform and should not treat the deployment as fully self-hosted or air-gapped.

The broader Ostorlab platform supports web, API, network, mobile, and source-code security testing. It also provides agentic scan profiles designed to investigate application behavior, validate findings, and examine relationships across connected assets.

This approach reduces the infrastructure required to operate a complete local AppSec platform while extending testing to private environments.

What to verify: Network egress requirements, transmitted data, regional hosting, scan profiles supported by the local scanner, concurrency, high availability, and operation during connectivity interruptions.

Invicti Enterprise On-Premises

Focus: Fully customer-hosted enterprise DAST platform featuring automated proof-based vulnerability validation across web applications and APIs.

Invicti Enterprise On-Premises provides a customer-hosted platform for automated web application and API security testing.

Its architecture can include the Invicti web application, database, scanning agents, and supporting services deployed within customer-controlled infrastructure. Distributed agents allow organizations to place scanning capacity near applications located across different network segments.

Invicti emphasizes enterprise DAST and automated validation. Its Proof-Based Scanning technology confirms supported vulnerabilities by demonstrating that exploitation is possible and attaching evidence to the finding.

The self-hosted model gives organizations greater control over infrastructure and data placement, but it also requires them to operate and maintain the platform.

What to verify: Infrastructure requirements, database architecture, supported authentication methods, agent placement, high availability, update procedures, API coverage, and whether any external services remain necessary.

Burp Suite DAST

Focus: Self-hosted enterprise web and API vulnerability scanning utilizing distributed Burp Scanner engines and CI/CD automation.

Burp Suite DAST provides centralized automated web and API security scanning using Burp Scanner.

PortSwigger documents self-hosted deployment options for organizations that need to operate DAST within their own environment. The platform supports scheduled scans, role-based access, CI/CD integration, issue tracking, APIs, and distributed scanning infrastructure.

Burp Suite DAST should be distinguished from Burp Suite Professional. DAST is intended for centralized and repeatable automated testing, while Burp Suite Professional is an interactive toolkit used by security practitioners for analyst-directed testing.

The self-hosted deployment provides control over the platform environment, but buyers should verify the exact architecture and external dependencies associated with the proposed edition.

What to verify: Supported self-hosted architecture, Kubernetes requirements where applicable, scanner capacity, authentication, API onboarding, upgrade procedures, external service dependencies, and the division between automated DAST and manual Burp workflows.

HCL AppScan

Focus: Multi-modal application security suite providing self-managed and private-site testing across DAST, SAST, and SCA workflows.

HCL AppScan is an application-security product family covering dynamic, static, software-composition, and related testing workflows.

On-premises capabilities are available through products such as AppScan Enterprise and AppScan Standard, while AppScan on Cloud uses a different delivery model and can employ private-site scanning to reach applications unavailable from the public internet.

Because AppScan is a product family, deployment and testing coverage depend on the selected components. Organizations should establish whether they need centralized enterprise DAST, desktop testing, source-code analysis, dependency analysis, or a combination of these functions.

The broader portfolio can support mature AppSec programs, but its architecture and licensing require product-level evaluation.

What to verify: Exact AppScan products and versions, which components are fully self-hosted, database and server requirements, private-site scanning architecture, supported testing methods, licensing, and upgrade responsibilities.

OpenText Fortify

Focus: Broad enterprise AppSec portfolio supporting customer-managed source code analysis (SAST), dynamic testing (WebInspect), and central security governance.

OpenText Fortify provides enterprise application-security testing across source code, deployed applications, and software dependencies.

Its portfolio includes Fortify Static Code Analyzer, WebInspect, Software Security Center, and software-composition capabilities. These products can support customer-managed AppSec workflows, including static analysis, dynamic testing, centralized governance, and integration with development pipelines.

Fortify’s strength is the breadth of its product family, but that breadth also means buyers must identify which products are required to create the intended on-premises architecture.

A Fortify deployment should be evaluated as a collection of connected components rather than a single scanner.

What to verify: Required Fortify products, deployment topology, licensing, database and infrastructure requirements, source-code handling, scan-engine placement, product interoperability, update procedures, and any cloud dependencies.

How to run a credible proof of value

Evaluation area	Verification procedure
Private access	Scan an application accessible only through internal DNS and confirm that no public exposure is required.
Data flow	Record every outbound connection and identify which application data, evidence, and metadata leave the environment.
Authentication	Test representative SSO, session-renewal, certificate, and role-based workflows.
Testing coverage	Run the required DAST, SAST, SCA, API, mobile, or network assessments using the proposed deployment.
Isolation	Interrupt external connectivity and document which functions continue, fail, or queue for later execution.
Scaling	Test concurrent scans and measure the infrastructure required for the expected application portfolio.
Maintenance	Perform an update or simulate the update process, including rollback and scanner synchronization.
Evidence	Confirm that findings contain reproducible requests, responses, code locations, or other technical proof.
Fix validation	Correct selected vulnerabilities and verify that the platform retests the affected behavior.

The proof of value should answer:

1. Which components run inside the organization?
2. Which data leaves the environment?
3. Can the platform test every required private asset?
4. What stops working without external connectivity?
5. Who is responsible for maintaining each component?
6. Can developers reproduce and verify the reported findings?

Frequently asked questions

What are the leading on-premises application security testing platforms?

The platforms evaluated in this comparison are Ostorlab, Invicti Enterprise On-Premises, Burp Suite DAST, HCL AppScan, and OpenText Fortify. They differ in deployment architecture, testing scope, data handling, infrastructure requirements, and support for disconnected environments.

What is on-premises application security testing?

On-premises application security testing uses scanning or management components deployed within customer-controlled infrastructure to assess private applications, APIs, source code, binaries, or network services.

Is an on-premises scanner the same as a self-hosted platform?

No. An on-premises scanner executes tests from the customer environment, while orchestration and reporting may remain cloud-based. A self-hosted platform places the management layer, data storage, reporting, and scanning infrastructure under customer control.

Can on-premises security testing operate without internet access?

Only platforms explicitly designed for disconnected or air-gapped operation can be assumed to work without internet access. Self-hosted products may still require connectivity for licensing, updates, telemetry, external callbacks, or AI services.

Why do organizations deploy application security testing on-premises?

Common reasons include access to private applications, data-residency requirements, protection of source code and credentials, network segmentation, regulatory obligations, and the need to control assessment infrastructure.

What should buyers ask an on-premises AppSec vendor?

Buyers should ask which components run locally, what data leaves the environment, which functions require internet connectivity, who manages updates, which testing methods are supported locally, and whether the proposed architecture can meet isolation and availability requirements.

Ostorlab deployment consideration

Ostorlab extends its application-security platform into private environments through an on-premises scanner.

The scanner allows organizations to assess private web applications, APIs, networks, and other supported assets without exposing those targets publicly. It connects these assessments with Ostorlab’s broader scanning, findings, remediation, and monitoring workflows.

The defining architectural point is equally important: Ostorlab’s on-premises capability is a hybrid deployment, not a fully self-hosted or air-gapped platform.

Organizations should consider it when they need local access to private targets while retaining centralized cloud management. Those requiring all orchestration, storage, reporting, and testing infrastructure to remain inside an isolated environment should verify whether that requirement can be met before selection.

The decision should ultimately answer one question:

Does the proposed deployment keep the right components and data inside the environment while still providing the testing coverage the organization needs?