Comparison

Deslint vs. SonarQube: the honest comparison.

SonarQube and Deslint sit at different points in the pipeline. SonarQube is the enterprise-grade quality platform that runs server-side after commit, covering 40+ languages with SAST, taint analysis, SCA, and secrets detection. Deslint is a deterministic verification layer that runs inside the agent loop on the developer’s machine, before files are written and before shell commands execute. Different scopes, both useful — most regulated teams will end up running both.

Last updated May 14, 2026. Written by the deslint team. We’re trying to be honest, not to sell.

TL;DR at a glance

Question	Winner
Where does it fire — agent loop or server?	Deslint
Multi-language SAST across the whole org (Java, C#, Python, Go, …)	SonarQube
Design-system / Tailwind / WCAG enforcement in JSX	Deslint
MCP server callable from Cursor / Claude Code	Deslint
Pre-execution gate for shell commands the agent proposes	Deslint
Mature enterprise dashboard + portfolio reporting	SonarQube
Local-first, runs without a server	Deslint
CI / merge-gate integration	Both

What each tool is actually built for

SonarQube

An enterprise code-quality platform. Engineers commit code, CI pushes the scan to a SonarQube server (or SonarQube Cloud), and the platform reports issues across SAST, taint analysis, secrets detection, IaC scanning, and SCA. Covers 40+ languages — Java, C#, Python, Go, TypeScript, C++, Kotlin, Terraform, Kubernetes — and ships portfolio dashboards, customisable quality gates, and compliance exports.

If you run a 500-engineer org across multiple languages and you want a single quality-and-security platform with a dashboard the CISO can read, SonarQube is mature, deeply capable, and widely adopted. Trusted by Mercedes-Benz, Adobe, NASA, and Santander (their own social proof).

Deslint

A deterministic verification layer for AI-generated code. Runs inside the agent loop via MCP — your AI calls verify_before_write before writing a file and verify_shell_exec before running a command. 62 rules across design tokens, WCAG, backend safety, Next.js boundaries, and AI-coding antipatterns. Sub-1 ms warm verdict. Local. Zero LLM in the hot path.

Its scope is narrower than SonarQube’s by design. Deslint is not trying to be your SAST platform — it’s the structural gate the agent loop calls thousands of times per session, and the deterministic check that runs the moment the AI proposes a change.

Seven real questions, answered honestly

Where in the pipeline does each fire?

SonarQube fires post-commit, server-side. The developer commits, CI runs the scan, the server reports back. By the time SonarQube weighs in, the code has been written and shared. Useful as the org-wide quality dashboard; slow for the AI authoring loop.

Deslint fires inside the agent loop, on the developer’s machine, before the file is written. Sub-1 ms warm. The fix happens before the file lands on disk.

Verdict: Different pipeline stages. Both useful at their respective layers.

How many languages does each cover?

SonarQube covers 40+ languages and IaC technologies — Java, C#, Python, Go, Rust, C++, TypeScript, Kotlin, Swift, PHP, Ruby, Terraform, Kubernetes, and on. If your org has a Java backend, a Go data pipeline, and a Python ML team, SonarQube’s breadth is structurally unmatched.

Deslint covers TypeScript/JavaScript today, across six parsers (React JSX, Vue, Svelte, Angular, Astro, HTML). The 2027 roadmap ships Python next, then Go. We’re narrower on purpose — every language adds an integration burden that doesn’t serve our agent-loop thesis.

Verdict: SonarQube, conclusively, for multi-language SAST.

Who catches Tailwind / WCAG / design-token drift in JSX?

Deslint, decisively. Our 62 rules include arbitrary Tailwind values (bg-[#1a5276]), off-scale spacing, dark-mode parity, WCAG 2.2 AA contrast, responsive integrity, and design-token enforcement against your Tailwind config. This is the AI-generated-frontend category SonarQube’s rule packs structurally don’t cover.

SonarQube has solid TypeScript rules for code quality and bug detection but no concept of “this className violated the design system” or “this contrast ratio fails the WCAG 1.4.3 criterion.” Different scope.

Verdict: Deslint. SonarQube does not compete here.

Who works inside Cursor / Claude Code / Codex / Windsurf?

Deslint ships an MCP server with 12 tools the agent calls during authoring — including verify_before_write (pre-write gate) and verify_shell_exec (pre-execute gate, the Agent Action Firewall). Sub-1 ms warm verdict. The agent corrects its own output before the file is written.

SonarQube has no MCP surface and isn’t structurally positioned for the agent loop — it’s a server. You can’t put a SonarQube call on every AI-generated edit; the latency and deployment model don’t fit.

Verdict: Deslint. SonarQube is the wrong layer for this.

Who has the mature enterprise dashboard?

SonarQube, conclusively. Portfolio reporting, customisable quality gates, compliance exports, role-based access, audit logs, multi-project dashboards. This is fifteen years of enterprise UI work; Deslint won’t match it on day one, or honestly, on year one.

Deslint’s Teams and Enterprise tiers (waitlisted in Q3 2026) ship cross-repo dashboards focused on the AI-PR surface — per-agent attribution, weekly drift digest, Hosted Policy Registry for the firewall. Narrower scope, but optimised for the AI authoring loop rather than the whole-org code-quality view.

Verdict: SonarQube, today. Deslint is purpose-built for a different metric.

Can either run fully air-gapped?

Both. SonarQube Server supports self-hosted, air-gapped deployments — that’s a core enterprise offering and why it’s widely deployed in regulated industries.

Deslint runs locally by default. The ESLint plugin, the CLI, and the MCP server are all subprocesses on the developer machine. Zero bytes of source code leave the box, no server to deploy, no licence to manage.

Verdict: Both work air-gapped — through different mechanisms.

What does it cost?

SonarQube Community Edition is open source; SonarQube Developer, Enterprise, and Data Center editions are commercial (per developer-LOC or per LOC). At enterprise scale, that’s typically $50k–$500k+ per year.

Deslint’s open-source tier is free and MIT-licensed forever, including the firewall. Teams ($99/mo for 5 developers) and Enterprise (from $10k/year) add dashboards and the Hosted Policy Registry. Different cost shapes, different scopes — not a like-for-like comparison.

Verdict: Deslint is cheaper, SonarQube is broader. Buy what fits the scope.

When to use which

Use SonarQube alone if:

You run a multi-language org with 100+ engineers, you want one quality-and-security dashboard for the whole company, and you’re comfortable with code-quality checks firing post-commit on a server rather than inside the agent loop.

Use Deslint alone if:

Your stack is TypeScript/JavaScript-first (React, Vue, Svelte, Angular, Astro), you ship AI-generated code, you want a deterministic gate inside the agent loop, and you don’t need a multi-language enterprise platform yet.

Use both if:

You already run SonarQube as the org-wide quality platform and your engineers ship AI-generated frontend code through Cursor / Claude Code / Codex / Windsurf. Deslint fills the agent-loop gap SonarQube doesn’t fit; SonarQube fills the multi-language whole-org gap Deslint doesn’t cover. They sit at different stages of the pipeline.

Running them together

The cleanest setup we’ve seen: Deslint MCP inside the agent loop, Deslint CLI as the pre-commit / merge gate on the frontend surface, and SonarQube as the post-commit org-wide quality and SAST platform. Three layers, three different jobs.

# AI authoring loop (sub-millisecond, deterministic)
# Cursor / Claude Code / Codex → Deslint MCP
#   verify_before_write   → pre-write gate
#   verify_shell_exec     → pre-execute gate

# CI / merge gate — design + a11y + AI-coding rules
pnpm deslint scan "apps/**/*.{ts,tsx}" --format sarif

# Post-commit, org-wide quality + SAST + SCA
# SonarQube Server / Cloud picks up the commit and reports

Ready to add the agent-loop layer?

It takes about two minutes. The getting-started guide walks through the ESLint plugin, the CLI, the MCP server, and the Agent Action Firewall. None of them replace SonarQube; they sit beside it.

Get started Read the firewall page MCP setup guides