Should be replaced with 'equals(..., ignoreCase = true)'

Reports case-insensitive comparisons that can be replaced with equals(..., ignoreCase = true).

By using equals() you don't have to allocate extra strings with toLowerCase() or toUpperCase() to compare strings.

The quick-fix replaces the case-insensitive comparison that uses toLowerCase() or toUpperCase() with equals(..., ignoreCase = true).

Note: May change semantics for some locales.

Example:

  fun main() {
      val a = "KoTliN"
      val b = "KOTLIN"
      println(a.toLowerCase() == b.toLowerCase())
  }

After the quick-fix is applied:

  fun main() {
      val a = "KoTliN"
      val b = "KOTLIN"
      println(a.equals(b, ignoreCase = true))
  }

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

ReplaceWithIgnoreCaseEquals

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Kotlin | Redundant constructs

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection ReplaceWithIgnoreCaseEquals

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2025.2

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025