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Utilities · head to head

Karabiner-Elements vs Truecaller

Karabiner-Elements logo

Karabiner-Elements

Utilities

Free open source keyboard remapper for macOS, working at driver level before the OS sees a keystroke

From
Free
Rated
-
Full reviewWebsite
Truecaller logo

Truecaller

Utilities

Caller ID and spam blocking app that identifies unknown numbers by crowdsourcing users' contact books

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Karabiner-Elements it requires granting significant system-level permissions, including input monitoring, which some security-conscious users are reluctant to allow.; Truecaller its caller ID database is built from other users uploading their contact books, which means a person's name and number can be listed without them ever installing or consenting to Truecaller directly.
  • They diverge on capability: Karabiner-Elements covers Low-level key remapping, Truecaller covers Caller ID.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Karabiner-Elements and Truecaller actually diverge.

Attributes where Karabiner-Elements and Truecaller differ
AttributeKarabiner-ElementsTruecaller
Pricing modelOpen source, no licence feeFree tier plus subscription
PlatformsMaciOS, Android

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

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 Karabiner-Elements

  • Low-level key remapping
  • Complex modifications
  • Per-app and per-device rules
  • Complex modification rule library
  • Simple modifications GUI
  • Apple Silicon native

Only in Truecaller

  • Caller ID
  • Spam blocking
  • Call recording
  • SMS spam filtering
  • Truecaller for Business
  • Premium profile controls

What people use each for

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

Karabiner-Elements

  • A developer who wants to remap Caps Lock to Escape or Control and needs tap versus hold behaviournot Truecaller
  • Someone switching from a Windows or Linux keyboard layout who wants familiar modifier positions on a Macnot Truecaller
  • A user with an accessibility need around key repeat rate or modifier key behaviour that macOS settings cannot covernot Truecaller
  • Anyone who wants serious keyboard customisation without paying for BetterTouchTool or a similar all-in-one toolnot Truecaller

Truecaller

  • Someone wanting to identify unknown numbers calling from delivery services, banks or scam operationsnot Karabiner-Elements
  • A user who wants unknown-sender SMS automatically filtered out of the main inboxnot Karabiner-Elements
  • A small business wanting its verified name and logo to show when it calls customersnot Karabiner-Elements
  • A person who wants to check whether their own number is unexpectedly listed and request removalnot Karabiner-Elements

Where each one falls short

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

Karabiner-Elements

  • It requires granting significant system-level permissions, including input monitoring, which some security-conscious users are reluctant to allow.
  • Writing custom complex modification rules by hand means editing JSON, which is a real barrier for a non-technical user without the community rule library.
  • It only remaps keyboard input, so a user who also wants gesture or window management customisation needs a second tool such as BetterTouchTool or Rectangle.
  • Being an unpaid open source project, support depends on GitHub issues and community forums rather than a vendor support desk with guaranteed response times.
  • It is Mac only, so it does nothing for remapping needs on a Windows or Linux machine in the same household.

Truecaller

  • Its caller ID database is built from other users uploading their contact books, which means a person's name and number can be listed without them ever installing or consenting to Truecaller directly.
  • Removing a number requires actively finding and using the unlisting tool; it is opt-out, not opt-in, so most people never realise they need to do this.
  • The free tier is ad-supported, and ads appear on the call screen itself, which some users find intrusive during otherwise mundane phone use.
  • Call recording availability depends on local law and has been restricted or removed in some regions and OS versions, so it cannot be relied on everywhere.
  • Regulatory and app-store scrutiny of the contact-upload model has led to restrictions or bans in some countries, so availability and feature set are not consistent globally.

Pricing, plan by plan

Karabiner-Elements

Free
  • Karabiner-ElementsFree
    • Free and open source under the MIT licence
    • Full functionality with no paid tier
    • Optional donation via GitHub Sponsors or PayPal

Truecaller

Free
  • FreeFree
    • Caller ID and spam blocking
    • Ad-supported
    • Limited profile privacy controls
  • Premium$2.99/month
    • Ad-free
    • See who viewed your profile
    • Priority spam list updates

Which should you pick?

Choose Karabiner-Elements if

  • You need low-level key remapping.
  • You want to start without paying.
  • You work on Mac.
  • You also want complex modifications.
Karabiner-Elements review

Choose Truecaller if

  • You need caller id.
  • You want to start without paying.
  • You work on iOS, Android.
  • You also want spam blocking.
Truecaller review

Questions people ask

Is Karabiner-Elements or Truecaller better?
Neither clearly leads. Karabiner-Elements starts at Free and Truecaller at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Karabiner-Elements or Truecaller?
Karabiner-Elements starts at Free and Truecaller at Free.
Does Karabiner-Elements or Truecaller run on more platforms?
Karabiner-Elements runs on Mac. Truecaller runs on iOS, Android.
Can I use Karabiner-Elements for free?
Both have a free tier, so you can try either at no cost before committing.
What is Karabiner-Elements best used for?
Karabiner-Elements is most often used for a developer who wants to remap caps lock to escape or control and needs tap versus hold behaviour, someone switching from a windows or linux keyboard layout who wants familiar modifier positions on a mac, a user with an accessibility need around key repeat rate or modifier key behaviour that macos settings cannot cover, anyone who wants serious keyboard customisation without paying for bettertouchtool or a similar all-in-one tool. Of those, a developer who wants to remap caps lock to escape or control and needs tap versus hold behaviour and someone switching from a windows or linux keyboard layout who wants familiar modifier positions on a mac are not what Truecaller is typically brought in for.
What can Karabiner-Elements do that Truecaller cannot?
Karabiner-Elements covers Low-level key remapping, Complex modifications, Per-app and per-device rules, Complex modification rule library. Truecaller covers Caller ID, Spam blocking, Call recording, SMS spam filtering.

Answered from the vendors’ own pages

Karabiner-Elements: Is Karabiner-Elements really free?

Yes, entirely. It is open source under the MIT licence with no paid tier, though the project accepts voluntary donations.

Truecaller: How does Truecaller know who is calling me from an unsaved number?

It matches the number against a database built largely from other users' uploaded contact lists, plus spam reports from its user base.

Karabiner-Elements: Does it work on Apple Silicon Macs?

Yes, versions from 14 onward run natively on M1 through M4 chips.

Truecaller: Can I remove my number from Truecaller if I never installed it?

Yes, Truecaller provides an unlisting search and removal tool at truecaller.com/unlisting, though you must find and use it yourself.

Karabiner-Elements: Do I need to write JSON to use it?

Not necessarily. Simple key swaps use a GUI, and complex modifications can be imported from a public community rule library instead of writing rules by hand.

Truecaller: Does Truecaller read my messages or call content?

Truecaller states it does not access call or message content, only caller ID and spam-reporting metadata.

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