STACK vs. Aembit
Aembit is a workload-identity company. STACK is an agent-runtime company. The headlines look similar in 2026, but the engines underneath were built for different jobs. This page is for buyers trying to figure out whether they need both, or whether one of them is enough.
A workload-IAM company that recently started serving agents
Aembit (aembit.io) was founded to solve workload-to-workload access across clouds. The product they shipped is very good at that job. AWS workloads need to call Azure SaaS APIs, GCP workloads need to call on-prem databases, none of these workloads should hold long-lived secrets. Aembit's Access Control Plane sits in the middle and brokers the credentials, with Conditional Access policies that evaluate identity attributes, geography, time, and workload posture at request time. They have SOC 2 and ISO 27001:2022. Multi-cloud is genuinely first-class.
In 2026 they leaned into agents. The homepage tagline became “IAM for Agentic AI”. They shipped an MCP Gateway. The pitch became that agents are a kind of non-human identity and their existing control plane handles them naturally. That is true at the credential-issuance layer. An agent is a workload, an agent has an identity, that identity gets attested, a short-lived token is brokered. If your problem stops there, Aembit is a credible answer.
Why Conditional Access stops short for agent runtime
Conditional Access is identity-and-context-aware. It checks who you are, where you're calling from, what time it is, and whether your runtime posture is healthy. Once those checks pass and a token is issued, the resource trusts the token until it expires. That is a fine model for a workload that does deterministic work: read this row, write this object, call this API endpoint. It is a worse model for an agent, because an agent inside a single session can be steered by the words it reads. A prompt-injected agent has the same identity, the same posture, the same geography it had a second ago. It just has a different intent now.
STACK was built around that observation. We re-evaluate intent and scope at the proxy boundary on every outbound call, not just at issuance. We run content-aware detectors at the same point: prompt-injection, output exfiltration, scope drift, behavioral anomaly. We hash-chain every decision so it's externally verifiable. Revoke once and the cut propagates through five layers in under sixty seconds, including delegated children. None of that is what Aembit was built to do, and reasonable people at Aembit would probably agree.
The honest read: if your job is “broker access between non-human identities across clouds,” Aembit is in front of STACK on multi-cloud breadth, on-prem support, and operational maturity. If your job is “keep an agent inside its lane while it executes, with content-aware detection and a tamper-evident record of what it did,” Aembit can issue the token but does not enforce on the agent's actions after that. That is the gap STACK fills.
Talk to us if you're sizing the agent-runtime question and want a straight answer about what each side covers.
Last reviewed 2026-05-09. Aembit claims sourced from aembit.io homepage and trust page.