Lumen vs Fume

Comprehensive side-by-side comparison — features, pricing, performance, and more.

Updated August 2026

Lumen

Buildt AI Limited

The coding model that actually gets it — specialist coding AI (Cosine)

Freemium

73% verification coverage

Fume

Fume Technologies, Inc.

Get an extensive Playwright test suite overnight — autonomous AI QA

Paid

70% verification coverage

Trust & Reliability

Lumen

Uptime:100% (30-day)Status page

Customers (per vendor):Babcock, BT, HSBC +4

GDPR

Fume

SOC 2

Too Close to Call

Fume (6.7) vs Lumen (6.6) — difference of 0.1 points

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

AI Comparison Summary

Lumen

6.6

avg score

Fume

6.7

avg score

Both tools score very similarly overall — the best choice depends on your specific priorities.

Based on 12 dimensions

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

Too close to call — it's a tie

Lumen

Best For

Engineering teams in highly regulated industries needing secure, air-gapped AI coding capabilities

Organizations working with legacy systems and niche programming languages like COBOL or Fortran

Enterprise development teams requiring production-quality code generation and complex architecture reasoning

Software development teams seeking to improve code quality and accelerate development cycles in secure environments

Consider Alternatives If

Non-coding tasks (Lumen is specialized for software engineering)

Teams without strict security or data privacy requirements (its core value is in secure environments)

Users expecting automatic code integration without human review (outputs require manual checking)

Fume

Best For

Growing engineering teams automating browser testing without dedicated QA engineers

Software development teams needing resilient end-to-end tests that self-heal

Organizations migrating existing Playwright, Selenium, or Cypress tests to an AI-powered system

Companies seeking full code ownership and local execution of AI-generated tests

Consider Alternatives If

Not for non-technical users seeking a no-code test builder

Not for unit or integration testing (focuses on end-to-end browser testing)

Not for teams unwilling to integrate AI into their QA processes

* Verdict is based on our algorithmic scoring of publicly available data. Learn about our methodology

Lumen is best for

🤖Automation & Agents9.0🎧Customer Support9.0✍️Writing & Content8.0

Fume is best for

✍️Writing & Content7.0💬Chat & Conversation7.0🔍Research7.0

Filter by your use case:

Pros & Cons

Lumen

Pros

Specialized training on production code for superior software development outcomes
Supports a wide range of niche and enterprise programming languages
Flexible deployment options including public cloud, single-tenant, and air-gapped environments
Integrates into existing developer workflows via CLI, cloud, and desktop interfaces
Offers multi-agent orchestration and external tool access via MCP for complex tasks

Cons

Requires access to existing software code repositories for full functionality
No refunds are payable for any fees paid under any circumstances
Fair usage limits may apply, leading to suspension or termination if exceeded
Outputs are not automatically integrated into code repositories, requiring manual review and incorporation
Does not process personal data on behalf of users, limiting its use for PII-sensitive codebases

Fume

Pros

Generates 100% Playwright code, ensuring full ownership and local execution
Automates test design, writing, and maintenance, eliminating manual QA work
Self-heals flaky tests using an AI agent fallback, improving test stability
Supports migration of existing Playwright, Selenium, and Cypress tests
Offers free cloud test runners, reducing infrastructure costs
Integrates easily into existing CI/CD pipelines with a single API call

Cons

Requires video input for test generation, which may not suit all testing methodologies
Focuses primarily on browser testing, potentially limiting scope for other test types
No visual builder or low-code option for non-developers, requiring some technical familiarity
Pricing may be a barrier for very small teams or individual developers
Relies on AI for test generation and maintenance, which may require trust in AI's accuracy

Weighted Score — Adjust What Matters to You

Pick a profile or drag sliders — scores and radar update instantly on the right.

Quick profiles:

Ease of Use5

Output Quality5

Value for Money5

Customization5

Support5

Integration5

Accuracy & Reliability5

Compliance & Data Protection5

Performance5

Task Completion5

Tool Use Correctness5

Planning Quality5

Dimension Comparison

Lumen

6.6

/ 10

Fume

6.7

/ 10

Your pick

Dimension Breakdown

Ease of Use

How intuitive is onboarding, UI navigation, and day-to-day usage for the target audience?

Lumen

7.0

Fume

7.0

Output Quality

How accurate, reliable, and useful are the outputs this product generates?

Lumen

8.0

Fume

8.0

Value for Money

How well does the pricing match the features and output quality delivered?

Lumen

7.0

Fume

7.0

Customization

Calculated

How much can users tailor workflows, settings, prompts, or outputs to their needs?

Lumen

3.0

Fume

5.0▲ +2.0

Support

How strong is the documentation, customer support, community, and learning resources?

Lumen

7.0

Fume

7.0

Integration

Calculated

How well does it connect with other tools, APIs, and workflows?

Lumen

6.0

Fume

6.0

Accuracy & Reliability

Factual accuracy and hallucination resistance

Lumen

8.0

Fume

8.0

Compliance & Data Protection

Calculated

Compliance certifications and data-protection posture, aggregated from verified compliance signals

Lumen

4.0

Fume

4.0

Performance

Calculated

Latency + throughput speed

Lumen

5.0

Fume

5.0

Task Completion

End-to-end task success rate

Lumen

8.0

Fume

8.0

Tool Use Correctness

Picks the correct tool + correct arguments

Lumen

8.0

Fume

8.0

Planning Quality

Calculated

Multi-step planning depth + replanning capability

Lumen

8.0▲ +1.0

Fume

7.0

Calculated = derived from structured signals (integration count, API/open-source config, compliance certs, response-time). AI = LLM-assessed from public website content. Methodology

Task Performance

Lumen

Task

Fume

7.0

Code Completion

1.0

8.0

Bug Detection

7.0

Code Explanation

6.0

8.0

Refactoring

7.0

Test Generation

9.0

Multi Language Support

1.0

8.0

Context Understanding

7.0

Documentation Generation

6.0

8.0

Performance Optimization

5.0

8.0

Security Scanning

4.0

* Task scores (1–10) are algorithmically generated from publicly available data.

Data is sourced from public information and vendor websites. It may not always be up-to-date — verify pricing and features directly with the vendor before purchasing.Report inaccuracy

Frequently Asked Questions

Which is better, Lumen or Fume?

Both are strong options. Lumen is a strong choice, while Fume is a strong choice. The best choice depends on your specific use case, budget, and workflow requirements.

Is Lumen cheaper than Fume?

Lumen starts at free (freemium model). Fume starts at free (paid model) with a free trial. Use the Cost Calculator above for a detailed estimate.

What are the main differences between Lumen and Fume?

Lumen — "The coding model that actually gets it — specialist coding AI (Cosine)". Fume — "Get an extensive Playwright test suite overnight — autonomous AI QA". Key differences include their pricing models, platform support, integrations, and technical capabilities. See the Feature Comparison table above for a complete side-by-side breakdown.

Can I use Lumen and Fume together?

Yes, many teams use both tools together for different purposes. Use the Stack Builder section above to combine Lumen and Fume with other tools and save your AI toolkit.

Does Lumen or Fume have a free plan?

Lumen is available for free. Fume is a paid tool with a free trial. Always verify current pricing directly with the vendor.

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