Spacelift vs env0 vs Atlantis: IaC Automation Compared (2026)

Pick Spacelift if governance matters most: per-phase OPA policies, native drift detection, and the widest IaC support. Pick env0 if your workflow is ephemeral per-PR environments with TTLs and cost guardrails. Pick Atlantis if you want free, self-hosted, PR-driven Terraform and will run it yourself. HCP Terraform is the incumbent all three get compared against.

Once your Terraform footprint outgrows a handful of state files, running plan and apply from laptops stops working. For the broader field, see our best Infrastructure-as-Code tools guide.

Side by side, as of October 2026

Hosting model

Spacelift: SaaS-first, running on managed workers, with private worker pools inside your network for private resources. A fully self-hosted edition exists only on the Enterprise+ tier.

env0: Also SaaS-first, with the same self-hosted-agent option so runs execute against private networks while the control plane stays managed. No open-source core.

Atlantis: Self-hosted open-source, full stop. You run a Go binary (usually a container) somewhere reachable by your Git provider's webhooks. There is no SaaS Atlantis. That single fact drives most of the trade-offs below.

Policy-as-code

This is where Spacelift pulls ahead. Policies are written in Rego (Open Policy Agent) and attach at defined points: plan, approval, push, login, trigger, and notification. You can block an apply based on the plan's resource changes, not just the code. Spacelift supports Rego v0 and v1 and recommends v1 for new policies:

# Deny any plan that destroys an RDS instance in production
package spacelift

deny contains msg if {
    some resource in input.terraform.resource_changes
    resource.type == "aws_db_instance"
    "delete" in resource.change.actions
    "env:production" in input.spacelift.stack.labels
    msg := sprintf("blocked: deleting RDS %s in production", [resource.address])
}

env0: Uses OPA as well, wired through its approval-policy system, plus native cost and TTL guardrails. Solid, though less granular than Spacelift's per-phase model.

Atlantis: Has policy_check mode built on conftest (also OPA/Rego), so you can gate plans on policy. It works, but you assemble and maintain the plumbing yourself rather than getting a managed policy library.

Pricing model

Spacelift: As of October 2026 the Free plan covers 2 users and 1 public worker. Starter+ is $20,000 a year with unlimited users; Business and Enterprise are quoted, and price scales mainly with private worker count.

env0 (now styled "env zero"): The free tier allows up to 30 active environments and 250 deployments a month with unlimited users. Paid tiers are quoted and priced per successful apply or per environment, not per seat.

Atlantis: The software is free. Your cost is the compute you run it on plus the engineering time to operate it, patch it, and keep it available. That's rarely zero, but it's predictable and has no per-seat component, which matters a lot at 50-plus engineers.

Drift detection

Spacelift: Scheduled drift detection is a first-class feature. It periodically runs plans, flags stacks that no longer match state, and can auto-remediate by applying.

env0: Ships continuous drift detection with notifications and optional auto-remediation, configurable per environment.

Atlantis: No native drift detection. Teams bolt it on with a cron job that runs terraform plan and pipes results somewhere, or add a separate tool like driftctl. It's doable, but it's your project, not a checkbox.

Multi-IaC support

Spacelift: The broadest. Terraform, OpenTofu, Pulumi, CloudFormation, Ansible, and Kubernetes manifests all run as native stack types.

env0: Terraform, OpenTofu, Terragrunt, Pulumi, CloudFormation, and custom flows. Strong coverage, especially if you live in Terragrunt.

Atlantis: Terraform and OpenTofu focused, with Terragrunt via a wrapper. It does the Terraform workflow extremely well and doesn't pretend to be a general orchestrator.

Workflow and PR integration

All three post plan output as PR comments and gate the merge on approval.

Atlantis is the purest expression of the model: open a PR, it comments the plan, you type atlantis apply in the thread, it applies and reports back. Nothing else in the UI to learn.

Spacelift and env0 add web UIs, run history, RBAC, stack dependencies, and an audit trail on top of the same PR loop.

Ephemeral environments

env0 owns this category: spin up a full environment from a PR, tag it with a TTL, and destroy it automatically when the PR merges or the timer expires. "Every feature branch gets a disposable copy of the stack" becomes configuration rather than a scripting project.

Spacelift supports the pattern too through stack templates and hooks, but it's less turnkey. Atlantis has no built-in concept of ephemeral, TTL-bound environments; you'd script the create-and-destroy lifecycle yourself.

Self-hosting cost, honestly

Atlantis is free as a license, not as an operation. You own uptime, webhooks, the state backend, secrets, upgrades, and the on-call when the runner wedges mid-apply. For a team that already runs infrastructure competently, that overhead is small and the control is worth it. For a team that would rather not babysit another service, the seat cost of Spacelift or env0 buys back that time.

Making the decision

Ask three questions in order:

1. Do you want to run the service yourself? If no, Atlantis is out, and you're choosing between Spacelift and env0. If you're happy operating it and want zero seat cost, Atlantis is a strong finalist.
2. Is your defining need governance or ephemeral environments? Governance and broad policy leans Spacelift. Disposable per-PR environments and cost controls lean env0.
3. How many IaC tools do you actually run? Pure Terraform or OpenTofu keeps all three in play. A mix of Pulumi and CloudFormation pushes you toward Spacelift.

Questions people ask

Spacelift vs Atlantis: which should I use?

Atlantis if you want a free, PR-comment-driven Terraform workflow and are happy to host it, patch it, and build drift detection yourself. Spacelift if you need managed runs, per-phase policies, drift detection, and support for Pulumi or CloudFormation. The break-even is usually ops time: once operating Atlantis costs an engineer's week every quarter, the managed tool pays for itself.

Is env0 cheaper than Terraform Cloud?

It depends on shape. HCP Terraform bills per managed resource ($0.10 to $0.99 a month on Essentials to Premium as of October 2026), so a large estate gets expensive even with few users. env0 bills per apply or environment and has a free tier of 30 environments. Many resources with infrequent applies favors env0; small estates fit HCP Terraform's 500-resource free tier.

What are the main Spacelift alternatives?

env0, Atlantis, HCP Terraform, and Scalr are the common shortlist. Our Terraform Cloud alternatives piece covers migrating off HashiCorp's managed offering.

The call we'd make

For most growing platform teams, we'd start with Spacelift. The per-phase OPA policies and native drift detection solve the two problems that actually hurt as you scale (ungoverned applies and silent drift), and the broad IaC support means you won't outgrow it when someone inevitably adds Pulumi.

If ephemeral environments are your core workflow, go env0; nothing else makes that pattern as effortless. If you're a lean, infra-competent team that wants a free, PR-native flow and doesn't mind owning a container, Atlantis is still the honest answer. Check Spacelift's $20,000 Starter+ floor against your budget before you fall for the feature grid.

Sources

• Spacelift pricing
• env zero (env0) pricing
• HashiCorp pricing: HCP Terraform
• Spacelift docs: Policies
• Atlantis releases on GitHub