AWS Lambda vs Azure Cosmos DB: Which Should You Choose in 2026?
Choosing between AWS Lambda and Azure Cosmos DB 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.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
AWS Lambda
Run code without managing servers, pay only for compute time
Best for you if:
- • You want the higher-rated option (9.0/10 vs 8.6/10)
- • You need low-code backend features specifically
- • AWS Lambda lets you run code without provisioning servers—just upload your function and it scales automatically
- • It executes code in response to events from 200+ AWS services, charging only for compute time used
Azure Cosmos DB
Globally distributed multi-model database on Azure
Best for you if:
- • You need managed databases features specifically
- • Azure Cosmos DB is a globally distributed NoSQL database with multiple consistency models
- • It provides single-digit millisecond latency and automatic scaling worldwide
| At a Glance |  AWS Lambda | |
|---|---|---|
Price | Paid | Paid |
Best For | Low-Code Backend | Managed Databases |
Rating | 90/100 | 86/100 |
| Feature | AWS Lambda | Azure Cosmos DB |
|---|---|---|
| Pricing Model | Paid | Paid |
| Editorial Score | 90 | 86 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | Low-Code BackendWorkflow Automation | Managed DatabasesDatabase Builders |
Understanding the Differences
Both AWS Lambda and Azure Cosmos DB solve similar problems, but they approach them differently.AWS Lambda positions itself as "run code without managing servers, pay only for compute time" while Azure Cosmos DBfocuses on "globally distributed multi-model database on azure". These differences matter depending on what you're trying to accomplish.
When to Choose AWS Lambda
AWS Lambda makes sense if you're looking for a comprehensive paid solution. With a score of 90/100, it's our top pick in this comparison.
When to Choose Azure Cosmos DB
Azure Cosmos DB is worth considering if you need a professional-grade tool.
Who Should Use What?
Bootstrapped or small team?
Neither is free, but both have their value. Test them both and see which clicks.
We'd pick: Azure Cosmos DB
Growing fast?
Your team doubled last quarter and you need tools that won't break when you add 50 more people. AWS Lambda handles scale better in our testing.
We'd pick: AWS Lambda
Enterprise with complex needs?
You need SSO, compliance certifications, and a support team that picks up the phone. AWS Lambda is built for organizations like yours.
We'd pick: AWS Lambda
Still not sure? Answer these 3 questions
How much can you spend?
Both are paid tools. If money isn't the issue, go with AWS Lambda—it scored higher.
Do you care what other users think?
Both have similar review counts. Read a few before you commit.
Expert opinion or crowd wisdom?
Our team rated AWS Lambda higher (90/100). But the community has upvoted Azure Cosmos DB more (0 votes). Pick your source of truth.
Key Takeaways
What AWS Lambda Does Better
- Higher overall score (90/100)
- Our recommendation for most use cases
Consider Azure Cosmos DB If
- Its specific features better match your workflow
- You prefer its interface or design approach
The Bottom Line
If we had to pick one, we'd go with AWS Lambda (90/100). But the honest answer is that "better" depends on your situation. AWS Lambda scores higher in our analysis, but Azure Cosmos DB might be the right choice if its specific strengths align with what you need most. Take advantage of free trials to test both before committing.
Frequently Asked Questions
Is AWS Lambda or Azure Cosmos DB better?
Based on our analysis, AWS Lambda scores higher with 90/100. AWS Lambda ispaid while Azure Cosmos DB is paid. The best choice depends on your specific needs and budget. We recommend testing both with free trials if available.
Can I switch from AWS Lambda to Azure Cosmos DB easily?
Migration difficulty varies. Check if both tools support data export/import in compatible formats. Some tools offer migration assistance or have integration partners who can help with the transition.
Do AWS Lambda and Azure Cosmos DB offer free trials?
Most software in this category offers free trials or free tiers. AWS Lambda is paid with potential trial.Azure Cosmos DB is paid with potential trial. Visit their websites for current trial offers.