Codium AI vs Mellum by JetBrains: Which is Better in 2026?
Choosing between Codium AI and Mellum by JetBrains comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Codium AI is our overall pick for AI coding workflows. Pick Mellum by JetBrains if you need its specific feature set.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Codium AI
AI-powered test generation for code
Best for you if:
- • You want to try before committing
- • Codium AI is an AI-powered test generation tool that creates unit tests automatically
- • It analyzes your code and generates meaningful test cases with edge cases and assertions
Mellum by JetBrains
AI coding assistant for JetBrains IDEs
Best for you if:
- • AI assistant integrated into JetBrains IDEs for coding.
- • Provides intelligent code completion, generation, and explanation.
| At a Glance |  Codium AI |  Mellum by JetBrains |
|---|---|---|
Starts at | FreeFree tier available | Custom |
Best For | AI Coding | AI Coding |
Rating | 4.8/5 | - |
Free plan | Yes | No |
Choose Codium AI or Mellum by JetBrains?
Choose Codium AI if
AI-powered test generation for code
- AI test generation
- IDE integration
- Good for coverage
- You want a free tier before you commit
Choose Mellum by JetBrains if
AI coding assistant for JetBrains IDEs
- Deep integration with JetBrains IDEs for a seamless workflow.
- Significantly speeds up coding and reduces boilerplate.
- Helps developers understand unfamiliar codebases quickly.
| Feature | Codium AI | Mellum by JetBrains |
|---|---|---|
| Pricing Model | Freemium | Paid |
| User Rating | ★4.8/5 63 reviews | No ratings yet |
| Categories | AI CodingTesting & QA | AI CodingDeveloper Tools |
In-Depth Analysis
Codium AI
AI-powered test generation for code
Strengths
- +AI test generation
- +IDE integration
- +Good for coverage
- +Privacy options
- +Free tier
Weaknesses
- -Test quality varies
- -Learning curve
- -Language support varies
- -Enterprise expensive
- -Not replacement for manual
Key features
Value 78/100. Codium AI's pricing is fair and generous for individual developers with a free tier offering 250 credits/month, but the Teams plan at $19/user/month is a strong value given its test generation and PR-Agent features.
Watch out: Overage credits not specified; may require upgrade
Mellum by JetBrains
AI coding assistant for JetBrains IDEs
Strengths
- +Deep integration with JetBrains IDEs for a seamless workflow.
- +Significantly speeds up coding and reduces boilerplate.
- +Helps developers understand unfamiliar codebases quickly.
- +Improves code quality through intelligent suggestions and refactoring.
Weaknesses
- -Requires an existing JetBrains IDE subscription.
- -May have a learning curve for optimal utilization of AI features.
- -Reliance on AI might reduce deep understanding of certain code segments over time.
Key features
Pricing: Codium AI vs Mellum by JetBrains
| Plan | Codium AI | Mellum by JetBrains |
|---|---|---|
| Tier 1 | Free Developer | N/A |
| Tier 2 | $19 month per user Teams | N/A |
| Tier 3 | custom Enterprise | N/A |
Pricing verified from each vendor's public pricing page. Compare in detail on Codium AI pricing and Mellum by JetBrains pricing.
Who Should Use What?
On a budget?
Codium AI has a free tier. Mellum by JetBrains is paid only.
Go with: Codium AI
Want the highest-rated option?
Codium AI is rated 4.8/5. Mellum by JetBrains has no ratings yet.
Go with: Codium AI
Value user reviews?
Codium AI: 63 reviews (4.8/5). Mellum by JetBrains: no ratings yet.
Go with: Codium AI
3 Questions to Help You Decide
What's your budget?
Codium AI is freemium. Mellum by JetBrains is paid. Codium AI lets you start free.
What's your use case?
Both are ai coding tools. Compare their specific features to decide.
How important are ratings?
Codium AI is rated 4.8/5; Mellum by JetBrains has no ratings yet.
Key Takeaways
Codium AI
- Free tier available
- Our pick for this comparison
Mellum by JetBrains
- Choose if you want aI coding assistant for JetBrains IDEs
The Bottom Line
Codium AI is our pick.
Frequently Asked Questions
Is Codium AI or Mellum by JetBrains better?
Codium AI is rated in our evaluation. Codium AI is freemium and Mellum by JetBrains is paid.
What are Codium AI and Mellum by JetBrains used for?
Codium AI: AI-powered test generation for code. Mellum by JetBrains: AI coding assistant for JetBrains IDEs.
What does Codium AI cost vs Mellum by JetBrains?
Codium AI is freemium (free tier + paid plans). Mellum by JetBrains is a paid tool. Visit their websites for detailed pricing.