Tabnine vs Codeium vs Amazon CodeWhisperer: Best Free AI Code Assistant 2025

Not every developer needs a $20/month AI coding subscription. In 2025, three tools stand out for offering genuinely useful free tiers: Tabnine, Codeium, and Amazon CodeWhisperer. Each takes a different approach to AI-assisted coding, and the right choice depends on your language stack, preferred IDE, and privacy requirements.

This in-depth comparison covers free-tier limits, supported languages and IDEs, code completion accuracy, and real-world performance so you can pick the best free AI code assistant without spending a dollar.

Quick Comparison Table

Feature	Tabnine	Codeium	CodeWhisperer
Free Tier	Basic completions	Unlimited completions	Unlimited (Individual)
Languages	30+	70+	15 (deep), many more basic
IDE Support	VS Code, JetBrains, Vim, Neovim	VS Code, JetBrains, Vim, Neovim, Emacs, Eclipse	VS Code, JetBrains, AWS Cloud9
Chat / Explain	Limited on free	Yes (unlimited)	No
Security Scanning	No	No	Yes (free)
Privacy Model	No code storage (free)	No training on user code	Opt-out of sharing
License Filter	Pro only	No	Yes (reference tracker)
Paid Upgrade	$12/mo	$10/mo (Teams)	$19/mo (Pro)

Tabnine: The Privacy-First Veteran

Tabnine has been in the AI code completion space since 2018, making it one of the longest-running tools in this category. Its free tier provides basic code completions powered by smaller models, while the Pro tier unlocks larger models and whole-function generation.

Free Tier Details

• Short code completions (2-3 lines typical)
• 30+ language support
• Local model option for complete privacy
• Basic inline suggestions

Strengths

• Privacy leadership: Tabnine never stores or trains on your code, even on the free tier. The local model option means your code never leaves your machine.
• Consistency: Completions are predictable and rarely hallucinate APIs that do not exist.
• JetBrains excellence: One of the best-performing AI assistants in IntelliJ-based IDEs.

Weaknesses

• Free tier completions are shorter than competitors
• No chat or code explanation on the free plan
• Smaller model means less context awareness

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Codeium: The Most Generous Free Tier

Codeium (now Windsurf) has disrupted the AI coding space by offering unlimited code completions for free—no daily caps, no feature restrictions on completions. It also includes an integrated chat feature for code explanations and refactoring.

Free Tier Details

• Unlimited code completions
• Unlimited chat messages for code Q&A
• 70+ language support
• Context awareness across your project files

Strengths

• Truly unlimited: No artificial caps on the free tier. Use it all day without worrying about limits.
• Broadest IDE support: Works in VS Code, all JetBrains IDEs, Vim, Neovim, Emacs, Eclipse, and even Jupyter notebooks.
• Chat included: Ask questions about your code, get explanations, and request refactoring—all for free.
• Fast completions: Sub-200ms latency in most scenarios.

Weaknesses

• No open-source license filtering
• Requires cloud connection (no offline mode)
• Occasionally suggests deprecated patterns

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Amazon CodeWhisperer: The AWS-Native Choice

Amazon CodeWhisperer is Amazon’s answer to GitHub Copilot, and its Individual tier is completely free with unlimited completions. It shines brightest when writing AWS-related code but handles general programming well too.

Free Tier Details

• Unlimited code completions
• Built-in security scanning (50 scans/month)
• Open-source reference tracker
• 15 languages with deep support

Strengths

• AWS expertise: Unmatched for AWS SDK code, CloudFormation templates, CDK constructs, and Lambda functions.
• Security scanning: Free vulnerability detection is unique among competitors at this price point.
• Reference tracker: Flags when a suggestion resembles open-source code and shows the license, helping you stay compliant.
• No account paywalls: Just sign in with an AWS Builder ID (free) to get started.

Weaknesses

• Fewer supported languages than Codeium
• No integrated chat or code explanation
• Completion quality varies outside AWS context
• Limited IDE support compared to Codeium and Tabnine

Try CodeWhisperer Free →

Head-to-Head: Real-World Performance

Completion Speed

All three tools deliver completions in under 300ms on average. Codeium tends to be the fastest for short completions, while CodeWhisperer occasionally takes longer for multi-line suggestions as it performs additional security checks.

Accuracy by Language

Language	Tabnine	Codeium	CodeWhisperer
Python	Good	Excellent	Excellent
JavaScript/TypeScript	Good	Excellent	Good
Java	Good	Good	Excellent
Go/Rust	Fair	Good	Fair
AWS (CDK/SAM/CF)	Fair	Good	Excellent

Context Understanding

Codeium reads across multiple files in your project for context, giving it an edge for large codebases. Tabnine’s free tier has limited context windows. CodeWhisperer focuses on the current file but uses Amazon’s large training dataset for intelligent suggestions.

Which Should You Choose?

Choose Tabnine if:

• Privacy is your top priority (local model option)
• You primarily use JetBrains IDEs
• You want consistent, conservative suggestions
• You work in regulated industries with strict data policies

Choose Codeium if:

• You want the most features for free
• You work across multiple languages and IDEs
• You value chat and code explanation alongside completions
• You are a student or indie developer on a tight budget

Choose CodeWhisperer if:

• You build on AWS regularly
• Security scanning matters to you
• Open-source license compliance is important
• You need enterprise-grade governance (Professional tier)

Can You Use Multiple Tools Together?

Technically yes, but it is not recommended. Running two AI completion extensions simultaneously causes conflicts—duplicate suggestions, slower performance, and confusing UI overlaps. Pick one as your primary and disable the others.

A better approach: use Codeium for daily coding and CodeWhisperer specifically when writing AWS infrastructure code. Just toggle extensions as needed.

How Do These Compare to GitHub Copilot?

GitHub Copilot remains the most popular AI coding assistant, but at $10-19/month it is not free. If cost is not a concern, Copilot offers excellent quality. But for developers who want a strong free option, Codeium matches or exceeds Copilot in many scenarios. Check our detailed Copilot comparison for more.

Frequently Asked Questions

Is Codeium really free forever?

Codeium has committed to keeping its Individual plan free. The company monetizes through its Teams and Enterprise plans, so individual developers benefit from the free tier as a growth strategy.

Does CodeWhisperer require an AWS account?

You need a free AWS Builder ID, which is separate from a regular AWS account. No credit card is required.

Can Tabnine work completely offline?

Yes. Tabnine’s local model runs entirely on your machine. This is unique among AI code assistants and makes it the best choice for air-gapped environments.

Which tool is best for beginners?

Codeium, thanks to its unlimited chat feature. Beginners can ask the AI to explain code, suggest improvements, and learn programming concepts interactively.

Do these tools support Copilot-style ghost text?

Yes. All three show inline suggestions as gray ghost text that you accept with Tab. The experience is very similar to Copilot.

Final Verdict

For most developers on a budget, Codeium is the clear winner—unlimited completions, chat, and the broadest IDE support, all for free. CodeWhisperer is a must-try for AWS developers thanks to its unique security scanning and license tracking. And Tabnine remains the top choice for privacy-conscious developers who need local inference.

The best part? All three are free to try, so install each one for a day and see which fits your workflow. You might be surprised how much faster you code with the right AI assistant.