diff --git a/README.md b/README.md
index a7b98312..3b2acda7 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 [![GitHub Release](https://img.shields.io/github/v/release/jbzoo/csv-blueprint?label=Latest)](https://github.com/jbzoo/csv-blueprint/releases)    [![Total Downloads](https://poser.pugx.org/jbzoo/csv-blueprint/downloads)](https://packagist.org/packages/jbzoo/csv-blueprint/stats)    [![Docker Pulls](https://img.shields.io/docker/pulls/jbzoo/csv-blueprint.svg)](https://hub.docker.com/r/jbzoo/csv-blueprint/tags)    [![Docker Image Size](https://img.shields.io/docker/image-size/jbzoo/csv-blueprint)](https://hub.docker.com/r/jbzoo/csv-blueprint/tags)
 
 <!-- rules-counter -->
-[![Static Badge](https://img.shields.io/badge/Rules-277-green?label=Total%20number%20of%20rules&labelColor=darkgreen&color=gray)](schema-examples/full.yml)    [![Static Badge](https://img.shields.io/badge/Rules-66-green?label=Cell%20rules&labelColor=blue&color=gray)](src/Rules/Cell)    [![Static Badge](https://img.shields.io/badge/Rules-206-green?label=Aggregate%20rules&labelColor=blue&color=gray)](src/Rules/Aggregate)    [![Static Badge](https://img.shields.io/badge/Rules-5-green?label=Extra%20checks&labelColor=blue&color=gray)](#extra-checks)    [![Static Badge](https://img.shields.io/badge/Rules-227-green?label=Plan%20to%20add&labelColor=gray&color=gray)](tests/schemas/todo.yml)
+[![Static Badge](https://img.shields.io/badge/Rules-278-green?label=Total%20number%20of%20rules&labelColor=darkgreen&color=gray)](schema-examples/full.yml)    [![Static Badge](https://img.shields.io/badge/Rules-67-green?label=Cell%20rules&labelColor=blue&color=gray)](src/Rules/Cell)    [![Static Badge](https://img.shields.io/badge/Rules-206-green?label=Aggregate%20rules&labelColor=blue&color=gray)](src/Rules/Aggregate)    [![Static Badge](https://img.shields.io/badge/Rules-5-green?label=Extra%20checks&labelColor=blue&color=gray)](#extra-checks)    [![Static Badge](https://img.shields.io/badge/Rules-211-green?label=Plan%20to%20add&labelColor=gray&color=gray)](tests/schemas/todo.yml)
 <!-- /rules-counter -->
 
 ## Introduction
@@ -242,9 +242,10 @@ columns:
       is_email: true                    # Only email format. Example: "user@example.com".
       is_domain: true                   # Only domain name. Example: "example.com".
       is_uuid: true                     # Validates whether the input is a valid UUID. It also supports validation of specific versions 1, 3, 4 and 5.
-      is_alias: true                    # Only alias format. Example: "my-alias-123". It can contain letters, numbers, and dashes.
+      is_slug: true                     # Only slug format. Example: "my-slug-123". It can contain letters, numbers, and dashes.
       is_currency_code: true            # Validates an ISO 4217 currency code like GBP or EUR. Case-sensitive. See: https://en.wikipedia.org/wiki/ISO_4217.
       is_base64: true                   # Validate if a string is Base64-encoded. Example: "cmVzcGVjdCE=".
+      is_angle: true                    # Check if the cell value is a valid angle (0.0 to 360.0).
 
       # Validates if the given input is a valid JSON.
       # This is possible if you escape all special characters correctly and use a special CSV format.
@@ -898,7 +899,6 @@ It's random ideas and plans. No orderings and deadlines. <u>But batch processing
   * Warnings about deprecated options and features.
   * Add option `--recomendation` to show a list of recommended rules for the schema or potential issues in the CSV file or schema. It's useful when you are not sure what rules to use.
   * Add option `--error=[level]` to show only errors with a specific level. It's useful when you have a lot of warnings and you want to see only errors. 
-  * Move `const:HELP` to PHP annotations. Canonic way to describe the command.
   * S3 Storage support. Validate files in the S3 bucket? Hmm... Why not? But...
   * More examples and documentation.
 
diff --git a/schema-examples/full.json b/schema-examples/full.json
index 272cc225..eaee85a4 100644
--- a/schema-examples/full.json
+++ b/schema-examples/full.json
@@ -84,9 +84,10 @@
                 "is_email"              : true,
                 "is_domain"             : true,
                 "is_uuid"               : true,
-                "is_alias"              : true,
+                "is_slug"               : true,
                 "is_currency_code"      : true,
                 "is_base64"             : true,
+                "is_angle"              : true,
                 "is_json"               : true,
                 "is_latitude"           : true,
                 "is_longitude"          : true,
diff --git a/schema-examples/full.php b/schema-examples/full.php
index 6ebdc382..01952588 100644
--- a/schema-examples/full.php
+++ b/schema-examples/full.php
@@ -105,9 +105,10 @@
                 'is_email'              => true,
                 'is_domain'             => true,
                 'is_uuid'               => true,
-                'is_alias'              => true,
+                'is_slug'               => true,
                 'is_currency_code'      => true,
                 'is_base64'             => true,
+                'is_angle'              => true,
                 'is_json'               => true,
                 'is_latitude'           => true,
                 'is_longitude'          => true,
diff --git a/schema-examples/full.yml b/schema-examples/full.yml
index dc3a2f39..1f72dc8d 100644
--- a/schema-examples/full.yml
+++ b/schema-examples/full.yml
@@ -156,9 +156,10 @@ columns:
       is_email: true                    # Only email format. Example: "user@example.com".
       is_domain: true                   # Only domain name. Example: "example.com".
       is_uuid: true                     # Validates whether the input is a valid UUID. It also supports validation of specific versions 1, 3, 4 and 5.
-      is_alias: true                    # Only alias format. Example: "my-alias-123". It can contain letters, numbers, and dashes.
+      is_slug: true                     # Only slug format. Example: "my-slug-123". It can contain letters, numbers, and dashes.
       is_currency_code: true            # Validates an ISO 4217 currency code like GBP or EUR. Case-sensitive. See: https://en.wikipedia.org/wiki/ISO_4217.
       is_base64: true                   # Validate if a string is Base64-encoded. Example: "cmVzcGVjdCE=".
+      is_angle: true                    # Check if the cell value is a valid angle (0.0 to 360.0).
 
       # Validates if the given input is a valid JSON.
       # This is possible if you escape all special characters correctly and use a special CSV format.
diff --git a/schema-examples/full_clean.yml b/schema-examples/full_clean.yml
index c9e5dfb3..32edd8d2 100644
--- a/schema-examples/full_clean.yml
+++ b/schema-examples/full_clean.yml
@@ -112,9 +112,10 @@ columns:
       is_email: true
       is_domain: true
       is_uuid: true
-      is_alias: true
+      is_slug: true
       is_currency_code: true
       is_base64: true
+      is_angle: true
       is_json: true
       is_latitude: true
       is_longitude: true
diff --git a/src/Rules/Cell/DateFormat.php b/src/Rules/Cell/DateFormat.php
index 0bdfa577..8e5fb3ce 100644
--- a/src/Rules/Cell/DateFormat.php
+++ b/src/Rules/Cell/DateFormat.php
@@ -40,7 +40,7 @@ public function validateRule(string $cellValue): ?string
         $date = \DateTimeImmutable::createFromFormat($expectedDateFormat, $cellValue);
         if ($date === false || $date->format($expectedDateFormat) !== $cellValue) {
             return "Date format of value \"<c>{$cellValue}</c>\" is not valid. " .
-                "Expected format: \"<green>{$expectedDateFormat}<green>\"";
+                "Expected format: \"<green>{$expectedDateFormat}</green>\"";
         }
 
         return null;
diff --git a/src/Rules/Cell/ExactValue.php b/src/Rules/Cell/ExactValue.php
index 9d820b3c..c244a0b9 100644
--- a/src/Rules/Cell/ExactValue.php
+++ b/src/Rules/Cell/ExactValue.php
@@ -30,9 +30,13 @@ public function getHelpMeta(): array
 
     public function validateRule(string $cellValue): ?string
     {
+        if ($cellValue === '') {
+            return null;
+        }
+
         if ($this->getOptionAsString() !== $cellValue) {
             return "Value \"<c>{$cellValue}</c>\" is not strict equal to " .
-                "\"<green>{$this->getOptionAsString()}<green>\"";
+                "\"<green>{$this->getOptionAsString()}</green>\"";
         }
 
         return null;
diff --git a/src/Rules/Cell/IsAngle.php b/src/Rules/Cell/IsAngle.php
new file mode 100644
index 00000000..1bb5635a
--- /dev/null
+++ b/src/Rules/Cell/IsAngle.php
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * JBZoo Toolbox - Csv-Blueprint.
+ *
+ * This file is part of the JBZoo Toolbox project.
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @license    MIT
+ * @copyright  Copyright (C) JBZoo.com, All rights reserved.
+ * @see        https://github.com/JBZoo/Csv-Blueprint
+ */
+
+declare(strict_types=1);
+
+namespace JBZoo\CsvBlueprint\Rules\Cell;
+
+final class IsAngle extends IsFloat
+{
+    private float $min = 0.0;
+    private float $max = 360.0;
+
+    public function getHelpMeta(): array
+    {
+        return [
+            [],
+            [
+                self::DEFAULT => ['true', 'Check if the cell value is a valid angle (0.0 to 360.0).'],
+            ],
+        ];
+    }
+
+    public function validateRule(string $cellValue): ?string
+    {
+        $result = parent::validateRule($cellValue);
+        if ($result !== null) {
+            return $result;
+        }
+
+        $angle = (float)$cellValue;
+        if ($angle < $this->min || $angle > $this->max) {
+            return "Value \"<c>{$cellValue}</c>\" is not a valid angle <green>({$this->min} to {$this->max})</green>";
+        }
+
+        return null;
+    }
+}
diff --git a/src/Rules/Cell/IsAlias.php b/src/Rules/Cell/IsSlug.php
similarity index 66%
rename from src/Rules/Cell/IsAlias.php
rename to src/Rules/Cell/IsSlug.php
index bab6f35a..5c1e549c 100644
--- a/src/Rules/Cell/IsAlias.php
+++ b/src/Rules/Cell/IsSlug.php
@@ -16,9 +16,9 @@
 
 namespace JBZoo\CsvBlueprint\Rules\Cell;
 
-use JBZoo\Utils\Filter;
+use Respect\Validation\Validator;
 
-final class IsAlias extends AbstractCellRule
+final class IsSlug extends AbstractCellRule
 {
     public function getHelpMeta(): array
     {
@@ -27,7 +27,7 @@ public function getHelpMeta(): array
             [
                 self::DEFAULT => [
                     'true',
-                    'Only alias format. Example: "my-alias-123". It can contain letters, numbers, and dashes.',
+                    'Only slug format. Example: "my-slug-123". It can contain letters, numbers, and dashes.',
                 ],
             ],
         ];
@@ -35,9 +35,8 @@ public function getHelpMeta(): array
 
     public function validateRule(string $cellValue): ?string
     {
-        $alias = Filter::alias($cellValue);
-        if ($cellValue !== $alias) {
-            return "Value \"<c>{$cellValue}</c>\" is not a valid alias. Expected \"<green>{$alias}</green>\".";
+        if (!Validator::slug()->validate($cellValue)) {
+            return "Value \"{$cellValue}\" is not a valid slug. Expected format \"<green>my-slug-123</green>\"";
         }
 
         return null;
diff --git a/tests/Rules/Cell/ExactValueTest.php b/tests/Rules/Cell/ExactValueTest.php
index 31f28761..55afbd19 100644
--- a/tests/Rules/Cell/ExactValueTest.php
+++ b/tests/Rules/Cell/ExactValueTest.php
@@ -28,16 +28,13 @@ final class ExactValueTest extends TestAbstractCellRule
     public function testPositive(): void
     {
         $rule = $this->create('123');
+        isSame('', $rule->test(''));
         isSame('', $rule->test('123'));
     }
 
     public function testNegative(): void
     {
         $rule = $this->create('123');
-        isSame(
-            'Value "" is not strict equal to "123"',
-            $rule->test(''),
-        );
         isSame(
             'Value "2000-01-02" is not strict equal to "123"',
             $rule->test('2000-01-02'),
diff --git a/tests/Rules/Cell/IsAngleTest.php b/tests/Rules/Cell/IsAngleTest.php
new file mode 100644
index 00000000..11d51c2f
--- /dev/null
+++ b/tests/Rules/Cell/IsAngleTest.php
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * JBZoo Toolbox - Csv-Blueprint.
+ *
+ * This file is part of the JBZoo Toolbox project.
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @license    MIT
+ * @copyright  Copyright (C) JBZoo.com, All rights reserved.
+ * @see        https://github.com/JBZoo/Csv-Blueprint
+ */
+
+declare(strict_types=1);
+
+namespace JBZoo\PHPUnit\Rules\Cell;
+
+use JBZoo\CsvBlueprint\Rules\Cell\IsAngle;
+use JBZoo\PHPUnit\Rules\TestAbstractCellRule;
+
+use function JBZoo\PHPUnit\isSame;
+
+final class IsAngleTest extends TestAbstractCellRule
+{
+    protected string $ruleClass = IsAngle::class;
+
+    public function testPositive(): void
+    {
+        $rule = $this->create(true);
+        isSame('', $rule->test('0'));
+        isSame('', $rule->test('90'));
+        isSame('', $rule->test('360.0'));
+        isSame('', $rule->test('360'));
+
+        $rule = $this->create(false);
+        isSame(null, $rule->validate('90.1.1.1.1'));
+    }
+
+    public function testNegative(): void
+    {
+        $rule = $this->create(true);
+        isSame(
+            'Value "1230" is not a valid angle (0 to 360)',
+            $rule->test('1230'),
+        );
+        isSame(
+            'Value "-0.1" is not a valid angle (0 to 360)',
+            $rule->test('-0.1'),
+        );
+        isSame(
+            'Value "90.1.1.1.1" is not a float number',
+            $rule->test('90.1.1.1.1'),
+        );
+    }
+}
diff --git a/tests/Rules/Cell/IsAliasTest.php b/tests/Rules/Cell/IsSlugTest.php
similarity index 73%
rename from tests/Rules/Cell/IsAliasTest.php
rename to tests/Rules/Cell/IsSlugTest.php
index 304f7004..774f0ab4 100644
--- a/tests/Rules/Cell/IsAliasTest.php
+++ b/tests/Rules/Cell/IsSlugTest.php
@@ -16,19 +16,19 @@
 
 namespace JBZoo\PHPUnit\Rules\Cell;
 
-use JBZoo\CsvBlueprint\Rules\Cell\IsAlias;
+use JBZoo\CsvBlueprint\Rules\Cell\IsSlug;
 use JBZoo\PHPUnit\Rules\TestAbstractCellRule;
 
 use function JBZoo\PHPUnit\isSame;
 
-final class IsAliasTest extends TestAbstractCellRule
+final class IsSlugTest extends TestAbstractCellRule
 {
-    protected string $ruleClass = IsAlias::class;
+    protected string $ruleClass = IsSlug::class;
 
     public function testPositive(): void
     {
         $rule = $this->create(true);
-        isSame('', $rule->test(''));
+        isSame('Value "" is not a valid slug. Expected format "my-slug-123"', $rule->test(''));
         isSame('', $rule->test('123'));
 
         $rule = $this->create(false);
@@ -39,7 +39,7 @@ public function testNegative(): void
     {
         $rule = $this->create(true);
         isSame(
-            'Value "Qwerty, asd 123" is not a valid alias. Expected "qwerty-asd-123".',
+            'Value "Qwerty, asd 123" is not a valid slug. Expected format "my-slug-123"',
             $rule->test('Qwerty, asd 123'),
         );
     }
diff --git a/tests/schemas/todo.yml b/tests/schemas/todo.yml
index 5980fecc..735f9548 100644
--- a/tests/schemas/todo.yml
+++ b/tests/schemas/todo.yml
@@ -40,8 +40,6 @@ columns:
 
     rules:
       # https://github.com/Respect/Validation/blob/main/docs/08-list-of-rules-by-category.md
-      is_credit_card: brands[]        # https://github.com/Respect/Validation/blob/main/docs/rules/CreditCard.md
-      is_iban: true
       is_bool_value: true             # https://github.com/Respect/Validation/blob/main/docs/rules/BoolVal.md
 
       # Dates
@@ -66,6 +64,8 @@ columns:
       subdivision_code: [ ]           # https://github.com/Respect/Validation/blob/main/docs/rules/SubdivisionCode.md
 
       # ids
+      is_credit_card: brands[]        # https://github.com/Respect/Validation/blob/main/docs/rules/CreditCard.md
+      is_iban: true
       postal_code: country code       # https://github.com/Respect/Validation/blob/main/docs/rules/PostalCode.md
       is_bsn: true
       is_cnh: true
@@ -194,15 +194,14 @@ columns:
       # Math
       is_fibonacci: true
       is_prime_number: true
-      is_positive: true
-      is_negative: true
-      is_zero: true
       is_digit: true
       is_digits: true
       is_even: true
       is_odd: true
       is_roman: true
       is_perfect_square: true
+
+      # Strings
       is_alnum: true
       is_alpha: true
       is_charset: true
@@ -210,22 +209,18 @@ columns:
       no_whitespace: true
       is_phone: true
       is_punct: true
-      is_slug: true
-      is_space(s): true
+      is_spaces: true
+      is_space: true
       is_regex: true
       is_version: true
       is_vowel: true
       is_consonant: true
       is_xdigit: true
-      is_angle:                       # 0.0-360.0
 
       custom_func: callbak function
 
 
     aggregate_rules:
-      count_true: 1
-      count_false: 1
-
       # https://github.com/markrogoyski/math-php#statistics---averages
       truncated_mean: [ 1, 25 ]      # 25 percent of observations trimmed from each end of distribution
       generalized_mean: [ 1, 2 ]     # p-power mean