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.
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.
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
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.
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
0875 8479
Years of dev time saved
5271 0380 4060 9840
Production outages saved
7431 7120 4620 2140
In production since
9802 7040 8131 7266
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.