Duolingo's GPT-4 AI tutor for language learners.
View detailsCodeSignal
A technical assessment and learning platform that measures and builds real coding skills.
CodeSignal is a skills assessment and practice platform for developers. It offers coding challenges, skill assessments, and interview preparation, with a focus on measuring real coding ability rather than memorised answers. Developers can practise in the browser, earn certificates, and build a skills profile that employers can see.
Key Features
- Coding practice and skill assessments
- Certificates recognised by employers
- AI-powered evaluation and reporting
- Pre-screening and technical interviews for companies
- Skills profiles for developers
- Integrations with applicant tracking systems
Pricing
| Plan | Price | Details |
|---|---|---|
| Free for Developers | $0 | Practice, assessments, and certificates for individual developers. |
| Business | Check official site | Hiring assessments and interviews for companies. See the official site for current pricing. |
Prices as listed in 2026 research. Always check the official site for the latest price — plans change. Free plan: Yes — it has a free plan.
Popular with: Developers, Students, Business Owners
How it works
For companies, CodeSignal provides pre-screening assessments, technical interviews, and skills-based hiring tools, with AI-powered evaluation and reporting. The platform covers many languages and topics, from algorithms to data science, and it integrates with common applicant tracking systems.
CodeSignal is free for individual developers to practise and earn certificates. Companies buy a subscription for assessments and interviews, with pricing on the official site. It is best for developers who want a skills profile that employers trust, and for companies that hire on skills rather than CVs.
Pros and Cons
✓ Pros
- Skills-based assessment, not CV screening
- Certificates employers recognise
- Good practice for interviews
- AI evaluation saves hiring time
✗ Cons
- Business pricing is not published clearly
- Assessment focus suits companies more than learners
- Some features need a paid team plan
Frequently Asked Questions
Is CodeSignal free?
Yes — CodeSignal has a free plan. Free for developers; business plans on the official site
What is CodeSignal best for?
developers who want to practise coding skills and earn certificates recognised by employers.
What kind of tool is CodeSignal?
CodeSignal is a Education & Learning tool on VerlumoAI.
Related Tools
Khan Academy's AI tutor that teaches, not just answers.
View detailsFlashcards plus an AI tutor that quizzes you — Q-Chat.
View detailsLast reviewed: November 2026