When is AWS Lambda the better choice?

You are already using AWS services like S3, DynamoDB, EventBridge, or SNS and want Lambda to sit in the middle of that stack. You need advanced Lambda options such as provisioned concurrency, durable workflows, tenant isolation, or managed instances. You want to tune runtime cost tightly and understand charges in requests, GB-seconds, and add-on features separately. You expect to outgrow the free tier in a way that benefits from AWS pricing tools like Savings Plans or EC2-backed managed instances.

When is Cloud Functions for Firebase the better choice?

You are building a Firebase-first mobile or web app and want backend logic close to Firebase Authentication, Firestore, or other Firebase triggers. You want a free tier with more included invocations and extra allowances for outbound networking, build minutes, and container storage. You want to start without a credit card requirement being stated in the free tier. You prefer a simpler path for app backends and event handlers rather than general AWS infrastructure.

AWS Lambda vs Cloud Functions for Firebase: Free Tier Comparison

Q: How much does AWS Lambda cost after the free tier?

AWS Lambda on-demand - Pay for what you use. AWS Lambda is clearly usage-based after the free tier, with charges for requests and execution duration, plus separate pricing for add-ons like provisioned concurrency and durable functions. Firebase also uses usage-based pricing on Blaze, but the input does not provide enough rate detail to price scenarios reliably beyond the included no-cost quotas. For small builders staying inside the free tier, Firebase is the cheaper entry because it does not require a card in the provided data. Once usage grows, Lambda gives more granular control and more paid features, but costs can stack up across compute, storage, and workflow extras.

Q: How much does Cloud Functions for Firebase cost after the free tier?

Blaze plan - Pay as you go (Blaze plan). AWS Lambda is clearly usage-based after the free tier, with charges for requests and execution duration, plus separate pricing for add-ons like provisioned concurrency and durable functions. Firebase also uses usage-based pricing on Blaze, but the input does not provide enough rate detail to price scenarios reliably beyond the included no-cost quotas. For small builders staying inside the free tier, Firebase is the cheaper entry because it does not require a card in the provided data. Once usage grows, Lambda gives more granular control and more paid features, but costs can stack up across compute, storage, and workflow extras.

Quick answer

Cloud Functions for Firebase - Cloud Functions for Firebase wins for most builders who want a free serverless backend with no card required and more included usage, while AWS Lambda is the better fit when you want broader AWS integration and more control over runtime costs.

How the free tiers compare

These two free tiers are both usage-based serverless compute, but they are built for different kinds of builders. AWS Lambda is the more general-purpose option: it has a larger ecosystem, explicit request and duration pricing, and several advanced paid add-ons like provisioned concurrency, durable functions, tenant isolation, and managed instances. Cloud Functions for Firebase is narrower but friendlier for app builders, especially mobile and web teams already using Firebase. Its free tier includes more invocations, a bundled set of networking and build/storage allowances, and, importantly, no credit card requirement is stated for Spark. The tradeoff is scope: Firebase is easier for Firebase-centric backends, while Lambda is the more flexible infrastructure choice once you need deeper AWS integration or specialized execution features.

AWS Lambda vs Cloud Functions for Firebase free tier, side by side

	AWS LambdaFTV 49	Cloud Functions for FirebaseFTV 58
Free invocations per monthFirebase includes more invocation volume at no cost.	1 million	2 million
Free execution timeBoth list the same GB-seconds allowance.	400,000 GB-seconds per month	400,000 GB-seconds per month
Free CPU-secondsOnly Firebase explicitly includes CPU-seconds.	Not listed	200,000 per month
Free outbound networkingFirebase bundles outbound networking in the free tier.	Not listed	5 GB per month
Free build minutesRelevant for Firebase deployments and build workflows.	Not listed	120 Cloud Build minutes per day
Free artifact/container storageOnly Firebase includes this storage allowance.	Not listed	500 MB container storage in Artifact Registry
Credit card required for free tierThis claim is only made where the input explicitly states it.	Yes	No

After you outgrow the free tier

AWS Lambda is clearly usage-based after the free tier, with charges for requests and execution duration, plus separate pricing for add-ons like provisioned concurrency and durable functions. Firebase also uses usage-based pricing on Blaze, but the input does not provide enough rate detail to price scenarios reliably beyond the included no-cost quotas. For small builders staying inside the free tier, Firebase is the cheaper entry because it does not require a card in the provided data. Once usage grows, Lambda gives more granular control and more paid features, but costs can stack up across compute, storage, and workflow extras.

AWS Lambda next stepAWS Lambda on-demand - Pay for what you useUsage-based

Cloud Functions for Firebase next stepBlaze plan - Pay as you go (Blaze plan)Usage-based

Cost at real usage

Usage	AWS Lambda	Cloud Functions for Firebase
1.5 million invocations/month, light functionsLambda request pricing is $0.20 per million requests. Firebase invocation pricing is not provided in the input, so only the free-tier status is stated.	~$0.10/mo est. for requests over free tier, plus compute if duration exceeds free GB-seconds	Free (within tier)
2 million invocations/month, moderate execution timeBoth are still within the listed invocation allowance on Firebase, but Lambda only has 1 million free requests.	~$0.20/mo est. for requests over free tier, plus compute if duration exceeds free GB-seconds	Free (within tier)
500,000 GB-seconds/month, 1 million invocationsLambda compute pricing is $0.0000166667 per GB-second in the example rate. Firebase rates were not supplied.	~$1.67/mo est. for 100,000 GB-seconds over free tier, plus requests beyond 1 million if any	Free (within tier)

Estimates, not quotes. Usage-based rates change - verify with the vendor's pricing page before committing.

When to pick each one

Pick AWS Lambda when…

You are already using AWS services like S3, DynamoDB, EventBridge, or SNS and want Lambda to sit in the middle of that stack.
You need advanced Lambda options such as provisioned concurrency, durable workflows, tenant isolation, or managed instances.
You want to tune runtime cost tightly and understand charges in requests, GB-seconds, and add-on features separately.
You expect to outgrow the free tier in a way that benefits from AWS pricing tools like Savings Plans or EC2-backed managed instances.

Pick Cloud Functions for Firebase when…

You are building a Firebase-first mobile or web app and want backend logic close to Firebase Authentication, Firestore, or other Firebase triggers.
You want a free tier with more included invocations and extra allowances for outbound networking, build minutes, and container storage.
You want to start without a credit card requirement being stated in the free tier.
You prefer a simpler path for app backends and event handlers rather than general AWS infrastructure.

Bottom line

For the most common builder use case, Cloud Functions for Firebase is the easier free-tier pick if you are already in the Firebase ecosystem and want more included usage with no card requirement stated. AWS Lambda is the better choice when your backend needs to live in the broader AWS world or you expect to use advanced serverless features later. In short: Firebase wins for app builders starting simple, Lambda wins for infrastructure-minded builders who want more room to grow.

Read the full listings: AWS Lambda and Cloud Functions for Firebase. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.