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Cybersecurity · head to head

Google Authenticator vs Keil MDK

Google Authenticator logo

Google Authenticator

Cybersecurity

Free TOTP two-factor authentication app that gained optional cloud sync in 2023

From
Free
Free plan
Yes
Full reviewWebsite
Keil MDK logo

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Google Authenticator enabling cloud sync moves the security boundary for your 2FA codes to your Google account, so a compromised Google account can expose the same codes syncing was meant to protect.; Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Google Authenticator and Keil MDK actually diverge.

Attributes where Google Authenticator and Keil MDK differ
AttributeGoogle AuthenticatorKeil MDK
Pricing modelFree, no in-app purchasesfreemium
PlatformsiOS, AndroidWeb
CategoryCybersecurityDeveloper Tools

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

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 Google Authenticator

  • TOTP code generation
  • QR code setup
  • Optional Google account sync
  • Offline generation
  • Manual entry

Only in Keil MDK

Nothing recorded that Google Authenticator does not also cover.

What people use each for

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

Google Authenticator

  • Someone setting up two-factor authentication on a website that asks for a TOTP appnot Keil MDK
  • A user who wants codes to survive a lost or replaced phone via account syncnot Keil MDK
  • Someone who prefers a simple, free, single-purpose authenticator over a password manager's built-in onenot Keil MDK
  • A person migrating between phones who wants existing 2FA codes to transfer automaticallynot Keil MDK

Keil MDK

  • Embedded software developmentnot Google Authenticator
  • ARM microcontroller programmingnot Google Authenticator
  • Professional development environmentsnot Google Authenticator

Where each one falls short

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

Google Authenticator

  • Enabling cloud sync moves the security boundary for your 2FA codes to your Google account, so a compromised Google account can expose the same codes syncing was meant to protect.
  • It has no built-in backup export in a portable format, so moving away from Google Authenticator to another app usually means resetting 2FA on every individual service.
  • It lacks organisational features such as folders, search or notes that some competing authenticator apps offer for people managing many accounts.
  • There is no desktop app, so codes must be read off a phone screen when logging in from a computer.
  • If sync is off and the phone is lost without a separate backup, all codes are unrecoverable and every linked account needs its 2FA reset through account recovery.

Keil MDK

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

Pricing, plan by plan

Google Authenticator

Free
  • FreeFree
    • Unlimited accounts and codes
    • Optional Google account cloud sync
    • No ads

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

Which should you pick?

Choose Google Authenticator if

  • You need totp code generation.
  • You want to start without paying.
  • You work on iOS, Android.
  • You also want qr code setup.
Google Authenticator review

Choose Keil MDK if

  • You want to start without paying.
Keil MDK review

Questions people ask

Is Google Authenticator or Keil MDK better?
Neither clearly leads. Google Authenticator starts at Free and Keil MDK at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Google Authenticator or Keil MDK?
Google Authenticator starts at Free and Keil MDK at Free.
Does Google Authenticator or Keil MDK run on more platforms?
Google Authenticator runs on iOS, Android. Keil MDK runs on Web.
Can I use Google Authenticator for free?
Both have a free tier, so you can try either at no cost before committing.
What is Google Authenticator best used for?
Google Authenticator is most often used for someone setting up two-factor authentication on a website that asks for a totp app, a user who wants codes to survive a lost or replaced phone via account sync, someone who prefers a simple, free, single-purpose authenticator over a password manager's built-in one, a person migrating between phones who wants existing 2fa codes to transfer automatically. Of those, someone setting up two-factor authentication on a website that asks for a totp app and a user who wants codes to survive a lost or replaced phone via account sync are not what Keil MDK is typically brought in for.
What can Google Authenticator do that Keil MDK cannot?
Google Authenticator covers TOTP code generation, QR code setup, Optional Google account sync, Offline generation.

Answered from the vendors’ own pages

Google Authenticator: Does Google Authenticator cost anything?

No, it is free with no subscription or in-app purchases.

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
Google Authenticator: Is cloud sync safe?

Google documents it as protected by your Google account security. Whether that is an acceptable trade-off versus device-only storage is debated; you can turn sync off if you prefer local-only codes.

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
Google Authenticator: Can I export my codes to another app?

There is no official bulk export; moving to a different authenticator typically requires re-adding each account from its setup page.

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