Is Keil MDK or Spacelift better?

Neither clearly leads. Keil MDK starts at Free and Spacelift at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, Keil MDK or Spacelift?

Keil MDK starts at Free and Spacelift at Free.

Does Keil MDK or Spacelift run on more platforms?

Keil MDK runs on Web. Spacelift runs on Web, Self-hosted, Cloud.

Can I use Keil MDK for free?

Both have a free tier, so you can try either at no cost before committing.

What is Keil MDK best used for?

Keil MDK is most often used for embedded software development, arm microcontroller programming, professional development environments. Of those, embedded software development and arm microcontroller programming are not what Spacelift is typically brought in for.

What can Keil MDK do that Spacelift cannot?

Spacelift covers Multi-tool orchestration, Policy as code, Private workers, Spaces.

Developer Tools · head to head

Keil MDK vs Spacelift

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From: Free
Rated: -

Full review Website

Spacelift

Developer Tools

Infrastructure-as-code orchestration for Terraform, OpenTofu, Pulumi and Kubernetes

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site; Spacelift users are unlimited and private workers are metered, so deployment concurrency rather than headcount drives the bill, which inverts how most engineering budgets are built and is easy to under-forecast.
Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Keil MDK and Spacelift actually diverge.

Attributes where Keil MDK and Spacelift differ
Attribute	Keil MDK	Spacelift
Pricing model	freemium	By private worker and tier, not by user
Platforms	Web	Web, Self-hosted, Cloud

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Developer Tools).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Keil MDK

Nothing recorded that Spacelift does not also cover.

Only in Spacelift

Multi-tool orchestration
Policy as code
Private workers
Spaces
Blueprints
Drift detection

What people use each for

The jobs each tool is most often brought in to do.

Keil MDK

Embedded software developmentnot Spacelift
ARM microcontroller programmingnot Spacelift
Professional development environmentsnot Spacelift

Spacelift

Platform teams running infrastructure changes through approval gates rather than through application CInot Keil MDK
Organisations standardising Terraform and OpenTofu across many teams with policy enforcementnot Keil MDK
Estates needing private runners so cloud credentials never leave the networknot Keil MDK
Teams wanting drift detection and reconciliation rather than plan-time checks alonenot Keil MDK

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Keil MDK

Pricing for Essential and Professional subscriptions not disclosed on primary site
Customers must contact Arm Developer Tools store for subscription rates

Spacelift

Users are unlimited and private workers are metered, so deployment concurrency rather than headcount drives the bill, which inverts how most engineering budgets are built and is easy to under-forecast.
There is no affordable paid entry point. The free tier stops at two users and the next tier is a five-figure commitment with nothing in between.
Three of the five tiers are quote-only, so a shortlist cannot be costed without entering a sales process with each vendor on it.
The self-hosted build lags the hosted one, has no public worker pool and lacks the Azure and Google Cloud integrations available in the SaaS product, with OIDC federation offered as the workaround.
Stacks, Rego policies, Blueprints, Spaces and Spacelift-managed state are proprietary constructs, so leaving means rebuilding the orchestration layer rather than pointing it at a different runner.

Pricing, plan by plan

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

Spacelift

Free

FreeFree
- Two users
- Public workers only
- No private workers
Starter Plus$undefined/year
- Unlimited users
- Two public workers
- One to two private workers
Business$undefined/year
- Unlimited users
- Three private workers
- Quoted
Enterprise$undefined/year
- Unlimited users
- Five to thirty private workers
- Self-hosted option

Which should you pick?

Choose Keil MDK if

You want to start without paying.

Keil MDK review

Choose Spacelift if

You need multi-tool orchestration.
You want to start without paying.
You work on Web, Self-hosted, Cloud.
You also want policy as code.

Spacelift review

Questions people ask

Is Keil MDK or Spacelift better?: Neither clearly leads. Keil MDK starts at Free and Spacelift at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keil MDK or Spacelift?: Keil MDK starts at Free and Spacelift at Free.
Does Keil MDK or Spacelift run on more platforms?: Keil MDK runs on Web. Spacelift runs on Web, Self-hosted, Cloud.
Can I use Keil MDK for free?: Both have a free tier, so you can try either at no cost before committing.
What is Keil MDK best used for?: Keil MDK is most often used for embedded software development, arm microcontroller programming, professional development environments. Of those, embedded software development and arm microcontroller programming are not what Spacelift is typically brought in for.
What can Keil MDK do that Spacelift cannot?: Spacelift covers Multi-tool orchestration, Policy as code, Private workers, Spaces.

Answered from the vendors’ own pages

Keil MDK: Does Keil MDK have a free version?

Yes, Keil MDK Community Edition is free for non-commercial projects. Essential and Professional editions are available as monthly or annual subscriptions.

Source

Spacelift: How is Spacelift priced?

By tier and by private worker count rather than per user. Users are unlimited on every paid plan. The published figure on the pricing page carries no period label, and the FAQ describes the tier as an annual subscription, so confirm the period in writing.

Keil MDK: How much do Keil MDK paid editions cost?

Specific pricing for Essential and Professional editions is not published on the main site. Rates are available from the Arm Developer Tools store or by contacting Arm sales.

Source

Spacelift: Does it support OpenTofu?

Yes, and Spacelift sponsors the OpenTofu project, which is a substantive hedge for anyone avoiding Terraform under the Business Source Licence.

Spacelift: Is there a self-hosted version?

Yes, described as carrying Enterprise functionality, but it is priced on request and lags the hosted product on cloud integrations.

Spacelift: Why not just use the CI system we already have?

That is the real comparison. General purpose CI handles state, drift, approval gates and concurrency control for infrastructure poorly, and whether that is worth a five-figure floor depends on how much infrastructure change your organisation actually ships.

Spacelift: What happens to our pipelines if we leave?

They do not port. Rego policies, Blueprints, Spaces and managed state are Spacelift constructs and the orchestration has to be rebuilt elsewhere.

Keil MDK vs Spacelift

Keil MDK

Spacelift

The short version

Where they differ

What each one covers

Only in Keil MDK

Only in Spacelift

What people use each for

Keil MDK

Spacelift

Where each one falls short

Keil MDK

Spacelift

Pricing, plan by plan

Keil MDK

Spacelift

Which should you pick?

Choose Keil MDK if

Choose Spacelift if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Keil MDK

More on Spacelift

Keep looking

Other head to heads