About BitDive

BitDive is a runtime verification tool for Java and Kotlin services that records real execution behavior, including method calls, SQL queries and downstream requests, to review pull requests by behavior, ground AI coding agents in real context, and generate deterministic JUnit regression tests. It targets Java and Kotlin engineering teams, including those using AI agents such as Cursor, Claude or Devin to write code.

A lightweight Java agent attaches to a running service in about 5 minutes with no code changes, capturing traces, SQL and method calls with under 2% runtime overhead. Before letting an AI agent touch the code, BitDive gives it this runtime trace via MCP; after the agent applies a fix, BitDive captures a new trace and compares it against the baseline to catch SQL drift, extra calls, or performance regressions.

Once a change is proven correct, BitDive locks in the verified behavior as a deterministic JUnit replay suite with zero token usage, auto-mocking databases, HTTP calls and Kafka messages directly from the recorded trace. A Service Map and HeatMap visualize the full execution chain for debugging, PII is automatically masked before data leaves the application, and all data stays in the user's own infrastructure under a zero-trust security model.

BitDive is free for individual developers to use the full verification workflow without a sales process; company-wide rollout, with SSO, RBAC, private or air-gapped deployment and procurement support, is custom-priced. The company reports 35.5K+ Maven downloads, 1.1K+ active installs, and 117+ trusted teams, and its research cites 729 runtime-verified findings across 1,246 real pull requests on 6 production-scale codebases with 95% independent critic agreement.

Use cases

Eliminating AI hallucinations about existing code behavior
Reviewing pull requests by actual runtime behavior
Building a regression safety net before modernizing legacy systems
Reproducing a production bug locally from its trace
Catching breaking changes to API contracts

Key features

Records every method call, SQL query and downstream request
Gives AI agents (Cursor, Claude, Devin) real runtime context
Compares before/after traces to prove a change is correct
Generates deterministic JUnit replay tests at zero token cost
Auto-mocks databases, HTTP calls and Kafka from recorded traces
Visualizes execution with a Service Map and HeatMap
Auto-masks PII before it leaves the application
Single JVM agent install, under 2% runtime overhead, no code changes
Zero-trust encryption for data at rest and in transit
Local-first capture; data stays in your own infrastructure

Pros and cons

Pros

No sales process needed to start as an individual developer

35.5K+ Maven downloads and 117+ trusted teams

Minimal recording overhead, single-digit milliseconds

Cons

Free developer tier has no SLA, indemnities or custom engineering support

Company-wide rollout features require contacting sales

Pricing

Developer Use

Free

Full BitDive workflow for individual developers
Runtime traces, before/after comparison, and deterministic JUnit replay
MCP access for AI-assisted debugging and verification

Company Rollout

Custom

Organizational rollout across teams and services
SSO, RBAC, auditability, and rollout governance
Private cloud, self-hosted, and air-gapped deployment options

Reviews

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Frequently asked questions

What does BitDive do?

It captures real execution behavior from Java and Kotlin services and turns it into replay-based JUnit suites.

How is it different from Mockito?

BitDive records real behavior from running services instead of relying on hand-written mock scripts.

Do I need to change my code?

No, a Java agent attaches at startup with no SDK, annotations or code modifications.

What about performance overhead?

Single-digit millisecond overhead per request, suitable for staging and production.

Can AI agents use BitDive?

Yes, BitDive exposes runtime context to AI coding agents via MCP for tools like Cursor and Claude.

Is BitDive really free for individual developers?

Yes, individual developers can start through the self-serve flow without talking to sales.

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