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Infisical vs AWS KMS

How Infisical and AWS KMS differ on scope, key custody, deployment and cost.

	Infisical	AWS KMS
Type	OSS secrets	Cloud KMS
Scope	App secrets, PKI, SSH	Encryption keys
Deployment	SaaS + self-hosted	SaaS (AWS)
Key custody	KMS module; HSM support in paid tiers	FIPS 140-3 Level 3 validated HSMs
How it works	Starts where most teams actually hurt: .env files in Slack. Syncs secrets into CI, Kubernetes and cloud platforms, with dynamic secrets and rotation in paid tiers, and an internal CA alongside. Self-host the same code you would rent.	Keys never leave the service — you call it to encrypt and decrypt rather than fetching key material. Envelope encryption is the normal pattern: KMS protects a data key, the data key protects your data. Every AWS service integrates natively, which is most of the value.
Pricing*	Free (5 identities); Pro $20/identity/mo	$1/key/mo + $0.03 per 10k requests
Free tier	Yes	Yes
Licence	MIT (core)	—
Best for	Teams escaping .env files	Anything already running on AWS

Infisical

Genuinely quick to adopt — hours, not a quarter
Open-source core you can self-host
Over a hundred integrations for syncing

Less proven at very large scale than Vault
Per-identity pricing adds up on big teams

AWS KMS

Integrated with essentially every AWS service
Key material never leaves the HSM boundary
Trivially cheap at small and moderate scale

Manages keys, not application secrets
Costs climb with request volume, not key count

Bottom line

Choose Infisical for teams escaping .env files. Choose AWS KMS for anything already running on aws.

* Published list pricing (vendor pricing pages, August 2026).