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Developer Tools · head to head

Keil MDK vs Prettier

Keil MDK logo

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From
Free
Rated
-
Full reviewWebsite
Prettier logo

Prettier

Developer Tools

Opinionated code formatter

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site; Prettier inflexible style rules that cannot be customized significantly, forcing teams to accept opinionated defaults
  • Prices and features above were last checked on 29 August 2026.

Where they differ

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

Attributes where Keil MDK and Prettier differ
AttributeKeil MDKPrettier
Pricing modelfreemiumfree
PlatformsWebCLI, Editor Plugins, Build Tools
FoundedUnknown2016

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

What people use each for

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

Keil MDK

  • Embedded software developmentnot Prettier
  • ARM microcontroller programmingnot Prettier
  • Professional development environmentsnot Prettier

Prettier

  • Automatically formatting TypeScript files to project style standardsnot Keil MDK
  • Enforcing consistent HTML indentation across component filesnot Keil MDK
  • Removing style-related comments from pull request reviewsnot Keil MDK
  • Formatting GraphQL queries with consistent indentationnot 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

Prettier

  • Inflexible style rules that cannot be customized significantly, forcing teams to accept opinionated defaults
  • Developers must format entire files rather than selective line ranges in some contexts
  • Limited language support compared to some alternatives, though it covers major languages

Pricing, plan by plan

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

Prettier

Free

No published plan breakdown. See the Prettier review.

Which should you pick?

Choose Keil MDK if

  • You want to start without paying.
Keil MDK review

Choose Prettier if

  • You want to start without paying.
  • You work on CLI, Editor Plugins, Build Tools.
Prettier review

Questions people ask

Is Keil MDK or Prettier better?
Neither clearly leads. Keil MDK starts at Free and Prettier at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keil MDK or Prettier?
Keil MDK starts at Free and Prettier at Free.
Does Keil MDK or Prettier run on more platforms?
Keil MDK runs on Web. Prettier runs on CLI, Editor Plugins, Build Tools.
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 Prettier is typically brought in for.

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
Prettier: Is Prettier free and open source?

Yes, Prettier is completely free and open source, available as an npm package with no licensing costs or subscriptions.

Source
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
Prettier: Can Prettier be integrated with ESLint?

Yes, Prettier integrates with ESLint by disabling ESLint formatting rules via eslint-config-prettier, allowing both tools to work together with Prettier handling formatting and ESLint handling code quality.

Source
Prettier: Does Prettier support configuration customization?

Prettier is intentionally opinionated with limited configuration options to enforce consistency. You can create a .prettierrc file for basic customization, but Prettier does not support extensive rule customization like ESLint.

Source
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