diff --git a/src/main/scala/com/lectra/kapoeira/glue/Asserts.scala b/src/main/scala/com/lectra/kapoeira/glue/Asserts.scala
index 44bcef7..822f740 100644
--- a/src/main/scala/com/lectra/kapoeira/glue/Asserts.scala
+++ b/src/main/scala/com/lectra/kapoeira/glue/Asserts.scala
@@ -63,6 +63,21 @@ object Asserts extends Matchers with LazyLogging {
       }
     )
 
+  def approxEqual(assertionContext: AssertionContext, alias: String, jsonExpression: String, expected: String, approxRange: String):Assertion =
+    assertKafkaOutput(
+    assertionContext,
+    alias,
+    jsonExpression,
+    { actual => (
+        for{
+          x <- actual.double()
+          expected <- JsonExpr(expected).value.double()
+          approx <- JsonExpr(approxRange).value.double()
+        } yield{ x should equal ( expected  +- approx ) }
+      ).fold(fail(s"${actual} equal ${expected} +- ${approxRange}"))(identity)
+    }
+  )
+
   def matchExactObject(
                    assertionContext: AssertionContext,
                    alias: String,
@@ -150,6 +165,11 @@ object Asserts extends Matchers with LazyLogging {
 
   implicit class JsonNodeOps(val jsonNode: JsonNode) {
 
+    def double():Option[Double] ={
+      val none = (_:Any) => Option.empty[Double]
+      jsonNode.fold(obj = none, arr = none, number = Some(_), strng = none, bln = none, bin = none, nullOrUndef = none)
+    }
+
     def fold[T](
         obj: JsonNode => T,
         arr: JsonNode => T,
diff --git a/src/main/scala/com/lectra/kapoeira/glue/FeaturesStepDefinitions.scala b/src/main/scala/com/lectra/kapoeira/glue/FeaturesStepDefinitions.scala
index 7e00f60..19e0176 100644
--- a/src/main/scala/com/lectra/kapoeira/glue/FeaturesStepDefinitions.scala
+++ b/src/main/scala/com/lectra/kapoeira/glue/FeaturesStepDefinitions.scala
@@ -176,7 +176,7 @@ class FeaturesStepDefinitions
   }
 
   // ASSERT
-  And("^assert\\s+(\\S+)\\s+(\\S+)\\s*==\\s*(.*)\\s*$") {
+  And("^assert\\s+(\\S+)\\s+(\\S+)\\s*==\\s*([^+-]*)\\s*$") {
     (alias: String, jsonExpression: String, expected: String) =>
       logger.debug(
         s"Assert Step : (alias,jsonExpression,expected) ($alias,$jsonExpression,$expected)"
@@ -226,6 +226,21 @@ class FeaturesStepDefinitions
       )
   }
 
+  And("""^assert\s+(\S+)\s+(\$\S*)\s*==\s+([+-.eE0-9]+)\s+\+\-\s+([+-.eE0-9]+)\s*$""") {
+    (alias: String, jsonExpression: String, expectedJsonNumber: String,approximationJsonNumber:String) =>
+      val interpolatedExpectedJson =
+        backgroundContext.substituteVariablesIn(expectedJsonNumber)
+      val interpolatedApproximationJson =
+        backgroundContext.substituteVariablesIn(approximationJsonNumber)
+      Asserts.approxEqual(
+        assertionContext,
+        alias,
+        jsonExpression,
+        interpolatedExpectedJson,
+        interpolatedApproximationJson
+      )
+  }
+
   And("^assert\\s+var\\s+(\\S+)\\s+(\\$\\S*)\\s+match\\s+object\\s+(.*)$") {
     (variableName: String, jsonExpression: String, expectedJson: String) =>
       val interpolatedExpectedJson =
diff --git a/src/test/resources/features/assertions.feature b/src/test/resources/features/assertions.feature
index b507bc3..d78bc04 100644
--- a/src/test/resources/features/assertions.feature
+++ b/src/test/resources/features/assertions.feature
@@ -19,10 +19,19 @@ Feature: assertions
       | topic_out   | key1_${uuid} | aliasHeaders2.1 | value2.1 |
       | topic_out   | key2_${uuid} | aliasHeaders2.2 | value2.2 |
       | topic_out   | key3_${uuid} | aliasHeaders2.3 | value2.3 |
+      | topic_out   | key4_${uuid} | aliasHeaders2.4 | value2.4 |
     And assert value2.1 $.qux == 42
     And assert value2.2 $ has size 2
     And assert value2.2 $ == [3,4]
     And assert value2.3 $ == "value2.3"
+    And assert value2.4 $.foo == 12.0038209653823934567890123456789
+    And assert value2.4 $.foo == 12.0 +- 0.1
+    And assert value2.4 $.foo == 12.1 +- 0.1
+    And assert value2.4 $.foo == 12.0038 +- 1E-4
+    And assert value2.4 $.foo == 12.0037 +- 1E-3
+    And assert value2.4 $.foo == 12.0039 +- 1E-3
+    And assert value2.4 $.foo == 12.003 +- 1E-3
+    And assert value2.4 $.foo == 12.004 +- 1E-3
     And assert aliasHeaders2.1 $ == {"foo":"bar","baz":"42"}
     And assert aliasHeaders2.1 $.foo == "bar"
 
diff --git a/src/test/resources/features/records/keyheadersvalue.dat b/src/test/resources/features/records/keyheadersvalue.dat
index ec2fdc5..b43e52f 100644
--- a/src/test/resources/features/records/keyheadersvalue.dat
+++ b/src/test/resources/features/records/keyheadersvalue.dat
@@ -1,3 +1,4 @@
 key1_${uuid}#{"qux":42}#{"foo":"bar","baz":42}
 key2_${uuid}#[3,4]#{"foo":"bar","baz":[1,2]}
 key3_${uuid}#value2.3#{"foo":"bar"}
+key4_${uuid}#{"foo":12.0038209653823934567890123456789}#{"foo":"bar"}
diff --git a/src/test/scala/com/lectra/kapoeira/glue/AssertsTest.scala b/src/test/scala/com/lectra/kapoeira/glue/AssertsTest.scala
index dc863ab..8a93751 100644
--- a/src/test/scala/com/lectra/kapoeira/glue/AssertsTest.scala
+++ b/src/test/scala/com/lectra/kapoeira/glue/AssertsTest.scala
@@ -33,6 +33,31 @@ class AssertsTest extends AnyFlatSpec with Matchers with MockFactory {
 
   behavior of "Asserts"
 
+  it should "assert approximatively equals on numbers" in {
+    val backgroundContext = mock[BackgroundContext]
+    val assertionContext = new AssertionContext(WhenStepsLive(backgroundContext, recordConsume, KapoeiraProducer.run _))
+    val consumerRecord =
+      new ConsumerRecord("topic", 0, 0, "key", """{"foo": 12.003820965382393}""".getBytes.asInstanceOf[Any])
+    val valueAlias = "valueAlias"
+    val keyValueRecord = KeyValueWithAliasesRecord("topic", "key", valueAlias)
+    (backgroundContext
+      .consumeTopic(_: String, _: Map[String, Int])(_: RecordConsumer))
+      .expects(*, *, *)
+      .returning(Map("key" -> Seq(consumerRecord)))
+    val expectedConsumedRecords = List(keyValueRecord)
+    assertionContext.launchConsumption(expectedConsumedRecords)
+
+    Asserts.approxEqual(assertionContext, valueAlias, "$.foo", "12.0038","0.0001" )
+    Asserts.approxEqual(assertionContext, valueAlias, "$.foo", "12.0038","1E-4" )
+    Asserts.approxEqual(assertionContext, valueAlias, "$.foo", "12.0037","1E-3" )
+    Asserts.approxEqual(assertionContext, valueAlias, "$.foo", "12.0039","1E-3" )
+    Asserts.approxEqual(assertionContext, valueAlias, "$.foo", "12.003","1E-3" )
+    Asserts.approxEqual(assertionContext, valueAlias, "$.foo", "12.004","1E-3" )
+    Asserts.approxEqual(assertionContext, valueAlias, "$.foo", "12.0","0.1" )
+    Asserts.approxEqual(assertionContext, valueAlias, "$.foo", "12.1","0.1" )
+
+  }
+
   it should "assert equality on literals" in {
     val backgroundContext = mock[BackgroundContext]
     val assertionContext = new AssertionContext(WhenStepsLive(backgroundContext, recordConsume, KapoeiraProducer.run _))