GeezerVison is showing www.diffblue.com — AI Testing Agent for Enterprise Unit Testing - Diffblue - Diffblue

Automated regression unit test generation at scale

The Diffblue Testing Agent orchestrates your AI coding tools to create comprehensive, high quality test coverage with developer intervention so you can The Diffblue Testing Agent orchestrates your AI coding tools to create comprehensive, high quality test coverage with developer intervention so you can modernize legacy code with confidence

Generate your first tests

View benchmark results

The Problem

AI coding agents can’t deliver comprehensive coverage

You need 80%+ coverage. Claude and Copilot demand constant developer babysitting and still won’t get you close.

Low coverage despite endless prompting

Our benchmark research shows that hours of work and continuous prompting still results in low test coverage.

Constant context switching = AI toil

Checking in on your unpredictable agent every few minutes is the new developer productivity destroyer. Context switching kills.

Verification is the new bottleneck

Making sure AI-generated code doesn’t break requires high regression unit test coverage. Guaranteeing the tests are right requires Diffblue.

AI coding agents weren’t built for automatically generating tests at project-level scale. The Diffblue Testing Agent was.

Discover Diffblue Testing Agent

fixes

Verifies

Ships

HOW WE'RE DIFFERENT

Your AI coding agents generate individual tests. The Diffblue Testing Agent automatically orchestrates the entire process until the job is done: coverage analysis, build system fixes, test plan creation, parallelized test generation, output verification, project clean-up, and PR preparation.

They generate. We guarantee.

01
From AI code to production code
AI coding agents produce code quickly, including tests. But "produced" isn't "production-ready." Without verification, orchestration, and rollback, AI-generated tests create more work, not less.
02
From AI output to production-ready tests
Diffblue Agents uses your existing, enterprise-approved AI coding platform as the engine — then wraps it in a decade of test engineering expertise: scoping, sequencing, verification, and quality guarantees that turn raw AI output into tests you'd actually merge.

Works with your enterprise-approved AI stack.
No new LLM vendor to evaluate.

AI coding agents

+ Senior Developer

AI coding agents

+ Diffblue Testing Agent

Scope

Manual prompting

Entire codebase, autonomous

Developer effort

Constant monitoring & rework

Zero — point, run, walk away

Error handling

Garbage left behind, manual clean-up

Automated fixing and clean-up

Scale

Incremental progress

Hundreds of classes, parallelised

Expertise

Ad-hoc prompting

10 years of test engineering workflows

* Internal benchmark across 8 enterprise-grade Java repositories totalling 31,069 coverable lines. See benchmarks below.

BENCHMARK RESULTS

Don't take our word for it. See the data.

Diffblue Testing Agent vs. Sr.Developer + Claude Code — Internal benchmark across 8 enterprise-grade Java repositories totalling 31,069 coverable lines. All repositories started from 0% test coverage.

Java · Customer-provided project · 20k LoC (9k coverable lines)

Diffblue Testing Agent

+ Claude Code

Claude Code

+ Sr. Developer

Avg. line coverage

80.7%

32.3%

Avg. mutation coverage

61.3%

24.2%

Avg. test strength

81.8%

73.9%

Human intervention required

Setup only

510 minutes (8.5 hrs)

Across 8 anonymized Java repos · 31,069 coverable lines · All starting at 0% coverage

View full benchmark methodology and results

HOW IT WORKS

Point it at the repo. Walk away.

Diffblue Agents CLI processes your entire codebase autonomously — including legacy Java 8 and 11 codebases that generic AI tools struggle with.

Platform compatibility

Works with your enterprise-approved AI stack

Supported

Diffblue Agents for GitHub Copilot

Enterprise test generation that makes your Copilot investment pay off

Supported

Diffblue Agents for Claude Code

Autonomous test generation with the reliability Claude alone can't deliver

Java 8, 11, 17, 21, 25

Python

Gemini CLI— Coming soon

Codex— Coming soon

Pricing

Outcome-based pricing that scales with your value

Every line you’re charged for represents a unit test that compiles, passes, and improves your coverage. You’re only charged for tests that actually work.

See pricing

Charged per verified line of coverage added

Tests designed to achieve high mutation testing scores

Scales naturally — more repos  = more coverage = more value

Every Diffblue-generated test is verified to compile and pass before delivery

No maintenance renewal problem — pay once for coverage delivered

ENTERPRISE TRUST

Built for organizations that can't afford to get testing wrong

Banks need months of security review. Defense contractors require air-gapped solutions. Diffblue has been earning that trust for a decade.

Lines tested in production

7345

1629

9M +

Years of dev time saved

2131

2340

5300

5610

Production outages saved

9631

1020

2610

2370

In production since

9052

3800

3251

2306

Banks need months of security review. Defense contractors require air-gapped solutions. Healthcare companies need audit trails. Diffblue has been earning that trust for a decade.

Oxford University spin-out — formal methods heritage

Fortune 500 customers in financial services, insurance, technology

Diffblue CLI runs locally — your code stays in your environment

On-premises solutions available for regulated environments

Need a fully on-prem, no-LLM solution?

Diffblue Cover provides deterministic, offline Java unit test generation for environments that require air-gapped deployment with zero external dependencies.

Learn about Diffblue Cover

Autonomous unit test generation for enterprise codebases

Run the Diffblue Testing Agent on your codebase. See the coverage
results. Deploy with the AI coding platform you already use.

Request your evaluation