Last updated: 2026-08-20
Treblle sits between an API and its consumers, running 13 automated security checks on every request that passes through it. It scores APIs across four dimensions (AI readiness, design, performance, security) and auto-generates OpenAPI documentation directly from live traffic, distinguishing it from monitoring-only tools.
About Treblle
Treblle is an API observability and governance platform founded in 2020 by Vedran Cindric and Darko Blazevic, headquartered in Zagreb, Croatia. The company raised $8.42M in funding, led by Nauta Capital, and had reached $620,900 in annual revenue with 200 customers by 2023. The platform sits between an API and its consumers, capturing every request and response for monitoring, security, governance, and documentation purposes. Integration happens through a lightweight SDK, available for Node.js, Python, PHP, Laravel, .NET, Go, Java, Ruby, and 20+ other frameworks, or through an API gateway connector for AWS API Gateway, Azure API Management, Kong, MuleSoft, or Traefik. Either path forwards request and response metadata to Treblle's platform, where it feeds the monitoring, security scanning, governance scoring, and documentation features described below.
Pricing
Free tier available with no credit card required. Starter and Team plans are priced by request volume and team seats, disclosed only through a sales conversation. Enterprise uses custom negotiated contracts.
Key Features
- Real-Time API Monitoring: Tracks every API request and response in real time, exposing 50+ data points per call including latency, error rates, device info, user context, and geographic distribution.
- Automated Security Scanning: Runs 13 security checks per request including SQL injection detection, DDoS pattern analysis, and threat-level scoring, with alerts triggered on violations without requiring manual rule configuration.
- API Governance Scoring: Continuously scores APIs across 4 dimensions (AI Readiness, Design, Performance, Security) and surfaces specific actionable fixes, not just a score, so teams know exactly what to change.
- Live Auto-Generated Documentation: Generates and maintains OpenAPI-compliant documentation from actual live traffic, keeping docs current without requiring developers to manually update specification files after each API change.
- Compliance Monitoring: Automatically detects sensitive data patterns in API traffic and applies masking for GDPR, PCI DSS, CCPA, and HIPAA compliance, with per-request compliance violation flagging.
- Alfred AI Assistant: Built-in AI advisor that analyzes the OpenAPI spec and live traffic together, generating specific remediation suggestions for governance gaps, documentation holes, and security misconfigurations.
Pros
- The free tier is notably more generous than comparable tools like Postman or Moesif, letting most early-stage startups run their full API traffic without paying anything, by Treblle's own tier comparison.
- Documentation is generated from live traffic instead of a manually maintained OpenAPI spec, so it can't drift out of sync with what the API actually does the way hand-written docs often do.
- One SDK integration turns on monitoring, security scanning, governance scoring, compliance checking, and documentation together, rather than requiring three or four separate tools stitched into the same pipeline.
Cons
- Pricing above the free plan isn't published, so teams evaluating Starter, Team, or Enterprise plans need a sales conversation rather than a self-serve checkout.
- Treblle covers HTTP REST APIs but has no native support for GraphQL subscriptions or gRPC, which rules it out for teams standardized on those transport protocols.
- Governance scoring can generate a large volume of fix recommendations at once for APIs with existing technical debt, and Treblle doesn't rank them by priority.
Data Handling
- Compliance
- GDPR · PCI DSS · CCPA · HIPAA compliance monitoring
Frequently Asked Questions
How much does Treblle cost in 2026?
Treblle costs nothing until you outgrow the free plan's request allowance. Starter and Team plans require contacting Treblle's sales team, since exact pricing isn't published for either tier, and Enterprise adds negotiated contracts with undisclosed minimum commitments. One hidden cost: if usage spikes past the free allowance mid-month, Treblle requires upgrading for the full month rather than prorating a one-time overage.
Does Treblle have a free plan?
Yes. Treblle's free plan includes 250,000 API requests per month before you need to add a credit card, and it isn't a limited trial: monitoring, security scanning, documentation generation, and governance scoring are all included at that tier. Crossing the monthly cap requires upgrading to a paid plan; Treblle doesn't meter or bill per-request overage.
Which tools compete with Treblle in 2026?
Postman and Moesif are the closest competitors: Postman focuses on API testing and team collaboration on request collections, while Moesif targets B2B usage analytics and customer-facing metering. ReadMe and Stoplight compete on the documentation side, with ReadMe building developer portals from manually maintained specs and Stoplight offering a visual, design-first OpenAPI editor. None of the four combine live-traffic documentation generation with governance scoring the way Treblle does.
What separates Treblle from Postman?
Postman is built around manually creating and running API request collections for testing, while Treblle passively observes production traffic and turns it into documentation, security checks, and governance scores without anyone writing test cases. Postman doesn't score API governance or flag compliance violations, which are core to Treblle. Teams often use both together: Postman for pre-release testing, Treblle for post-deployment observability.
How do you get started with Treblle?
Sign up for Treblle's free plan (no credit card needed), then install the SDK that matches your stack, such as Node.js, Python, or Laravel, or connect an existing gateway like Kong or AWS API Gateway. Once the SDK is wired in, request and response data starts appearing in the dashboard immediately, and Treblle begins building live API documentation from that traffic without further setup.
HokAI guides covering Treblle
- AI Development Services in 2026: Which Layer You Actually Need: AI development services means four separate infrastructure layers, not one purchase: sandboxing, prompt testing, workflow durability, and API governance.