Treblle: API Observability & Governance | hokai.io

Last updated: 2026-06-04

Treblle monitors APIs across 50+ data points with 13 security checks per request and auto-generated docs. GDPR/PCI compliant. Free: 250K requests/month, no card needed.

Treblle is an API observability and governance platform founded in 2020 in Zagreb, Croatia, backed by $8.42M from Nauta Capital. It captures 50+ data points per API request, runs 13 automated security checks, generates live documentation from traffic, and scores APIs across AI Readiness, Design, Performance, and Security dimensions. The free plan includes 250,000 requests per month with no credit card required. Paid tiers cover higher volumes and enterprise support.

About Treblle

Treblle is an API observability and governance platform founded in 2020 by Vedran Cindrić and Darko Blaževic, headquartered in Zagreb, Croatia. The company raised $8.42M in funding with Nauta Capital as the primary investor and had reached $620,900 in annual revenue with 200 customers by 2023. The platform sits between your API and your consumers, capturing every request and response and surfacing 50+ data points per call for monitoring, security, governance, and documentation purposes. The core mechanism is a lightweight SDK integration (available for Node.js, Python, PHP, Laravel, .NET, Go, Java, Ruby, and 20+ more frameworks) or an API gateway connector (AWS API Gateway, Azure API Management, Kong, MuleSoft, Traefik) that forwards request metadata to Treblle's platform. From there, Treblle runs 13 automated security checks per request, including SQL injection detection, DDoS pattern analysis, and threat-level scoring, while simultaneously generating and maintaining live OpenAPI documentation from actual traffic rather than requiring manual specification updates. The governance system scores each API across four dimensions: AI Readiness (operation ID completeness, response schema documentation), Design (URL patterns, HTTP method correctness, versioning), Performance (response time benchmarks, CDN usage, compression headers), and Security (HTTPS enforcement, security headers like CSP and HSTS, authentication scheme verification). Alfred, Treblle's built-in AI assistant, analyzes the OpenAPI spec alongside live traffic and generates specific remediation suggestions when scores fall below benchmarks. Compliance monitoring covers GDPR, PCI DSS, CCPA, and HIPAA, automatically flagging requests that expose sensitive data patterns and applying masking rules to stored logs. The free plan includes 250,000 API requests per month with no credit card required. Paid plans (Starter, Team, Enterprise) unlock higher request volumes, additional team seats, and enterprise support, with pricing available on the Treblle pricing page.

Pricing

Free: 250,000 API requests/month, no credit card required. Paid tiers: Starter (small teams), Team (business-critical APIs), Enterprise (custom pricing). No credit card required until exceeding 250,000 requests/month.

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

• Free tier includes 250,000 API requests per month with no credit card required, which covers the full API traffic volume of most early-stage startups and is 5x more generous than comparable free tiers from Postman or Moesif.
• Documentation is auto-generated from live traffic rather than requiring manual OpenAPI spec maintenance, eliminating the common problem of outdated API docs that no longer match production behavior.
• Single SDK integration provides monitoring, security scanning, governance scoring, compliance checking, and documentation simultaneously, replacing tools that would otherwise require 3-4 separate integrations.

Cons

• Pricing for paid tiers beyond the free plan is not publicly listed, requiring a sales conversation for teams that need more than 250,000 requests/month, which creates friction for self-serve engineering teams evaluating the tool.
• The platform focuses on HTTP REST APIs and lacks native support for GraphQL subscriptions or gRPC, which limits its usefulness for teams using modern API transport protocols.
• Governance scoring is valuable but generates alert volume that teams must triage: APIs with large existing technical debt receive dozens of simultaneous fix recommendations without a clear prioritization ranking.

Frequently Asked Questions

What is Treblle and what does it do?

Treblle is an API observability and governance platform founded in 2020 by Vedran Cindrić and Darko Blaževic in Zagreb, Croatia, backed by $8.42M in funding from Nauta Capital. It integrates with your API via a lightweight SDK or API gateway connector and captures 50+ data points for every request, providing real-time monitoring, 13 automated security checks per request, live auto-generated documentation, compliance scanning (GDPR, PCI DSS, CCPA, HIPAA), and API governance scoring across design, performance, security, and AI readiness dimensions.

How much does Treblle cost?

Treblle's free plan includes 250,000 API requests per month with no credit card required. Beyond the free tier, Treblle offers Starter (for small professional teams), Team (for business-critical APIs), and Enterprise plans, with specific pricing for paid tiers not publicly listed. You can use the full platform for free up to 250,000 monthly requests, and Treblle only asks for payment information when you exceed that threshold. Contact Treblle's sales team for current paid tier pricing.

What are the main features of Treblle?

Treblle's core features include real-time API monitoring with 50+ data points per request, 13 automated security checks (SQL injection, DDoS detection, threat scoring), live auto-generated OpenAPI documentation from actual traffic, API governance scoring across AI readiness, design, performance, and security, compliance monitoring for GDPR, PCI DSS, CCPA, and HIPAA, and Alfred AI assistant for governance remediation guidance. All features activate from a single SDK integration in your existing API code.

Is Treblle free to use?

Yes, Treblle has a free plan that includes 250,000 API requests per month with no credit card required. The free plan provides access to the full monitoring, security scanning, documentation generation, and governance scoring features. For most early-stage startups and small APIs, 250,000 requests per month is sufficient without requiring a paid upgrade. Treblle only requests payment information once usage exceeds the free tier limit.

What are the best alternatives to Treblle?

The main alternatives are Postman (preferred when API testing and team collaboration on request collections is the primary need), Moesif (preferred for B2B API analytics and customer-facing usage metering), ReadMe (preferred for developer portal creation with manual API documentation), and Stoplight (preferred for design-first API development with visual OpenAPI spec editing). Treblle differentiates itself with auto-generated documentation from live traffic and multi-dimensional governance scoring that none of these alternatives provide in a single tool.

Who is Treblle best for?

Treblle is best for backend engineering teams at API-first companies who need real-time production visibility without building custom logging infrastructure, and for platform engineers managing multiple internal APIs who need centralized governance and compliance monitoring. It is particularly strong for companies with GDPR or PCI DSS obligations where automatic sensitive data detection in API traffic is required. It is not well-suited for teams working with GraphQL subscriptions, gRPC, or WebSocket APIs, which Treblle does not currently support.

Does Treblle have an API?

Treblle integrates into your existing API via SDKs available for 20+ frameworks including Node.js (Express, NestJS, Fastify), Python (Django, Flask, FastAPI), PHP (Laravel, Symfony), Java (Spring Boot), .NET Core, Go, and Ruby on Rails. API gateway integrations are available for AWS API Gateway, Azure API Management, Kong, MuleSoft, Traefik, and Cloudflare. Documentation is available at docs.treblle.com with framework-specific quickstart guides for each integration method.

Visit Treblle Official Website