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Developer Tools · head to head

Keil MDK vs Tuta

Keil MDK logo

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From
Free
Free plan
Yes
Full reviewWebsite
Tuta logo

Tuta

Cybersecurity

Secure, green and ad-free. Email to feel good about.

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site; Tuta individual plan pricing only shown in EUR; no USD conversion provided on site
  • Prices and features above were last checked on 29 August 2026.

Where they differ

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

Attributes where Keil MDK and Tuta differ
AttributeKeil MDKTuta
CategoryDeveloper ToolsCybersecurity

Identical on both: starting price (Free), pricing model (freemium), free tier (Yes), platforms (Web), user rating (Not yet rated).

What people use each for

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

Keil MDK

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

Tuta

  • Private encrypted email communicationnot Keil MDK
  • Users valuing end-to-end encryption and zero-knowledge architecturenot Keil MDK
  • Individuals seeking open-source email clientsnot Keil MDK
  • Organizations requiring quantum-resistant encryptionnot 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

Tuta

  • Individual plan pricing only shown in EUR; no USD conversion provided on site
  • Family plan pricing separate (EUR 3 or EUR 8 per additional user) not included in main pricing
  • Shared mailboxes require additional EUR 3-8 monthly charges

Pricing, plan by plan

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

Tuta

Free
  • Free PlanFree
    • 1 GB storage
    • 1 calendar
    • 3 labels
  • Revolutionary Plan$3/month
    • 20 GB storage
    • 15 email aliases
    • 3 custom domains
  • Legend Plan$8/month
    • 500 GB storage
    • 30 email aliases
    • 10 custom domains

Which should you pick?

Choose Keil MDK if

  • You want to start without paying.
Keil MDK review

Choose Tuta if

  • You want to start without paying.
Tuta review

Questions people ask

Is Keil MDK or Tuta better?
Neither clearly leads. Keil MDK starts at Free and Tuta at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keil MDK or Tuta?
Keil MDK starts at Free and Tuta at Free.
Does Keil MDK or Tuta run on more platforms?
Both run on Web, so platform support will not decide this one for you.
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 Tuta 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
Tuta: How much does Tuta email cost?

Tuta offers a free plan with 1 GB storage. Paid plans are EUR 3/month (Revolutionary) with 20 GB storage and 15 email aliases, and EUR 8/month (Legend) with 500 GB storage and 30 email aliases. Family plan add-ons cost EUR 3-8 per additional mailbox member monthly.

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
Tuta: Is there a free email plan with Tuta?

Yes, Tuta's free plan includes 1 GB of storage, one calendar, three labels, and full end-to-end encryption security features with no custom domains or email aliases.

Source
Tuta: What are the limits on Tuta's free email plan?

The free plan provides 1 GB storage, access to one calendar, three labels maximum, and no support for custom domains or additional email aliases.

Source
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