diff --git a/CHANGELOG.md b/CHANGELOG.md
index 216d1db..dc6b78d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.1.0
+
+- Add `get_supported_languages` method to engine
+- Fix issue with "x,x" improper fraction rule
+- Compute tolerance against rounded value instead of floor
+- Use Decimal for string input
+- Add command-line interface
+
 ## 1.0.0
 
 - Initial release
diff --git a/setup.py b/setup.py
index 40c17c9..f1db621 100644
--- a/setup.py
+++ b/setup.py
@@ -9,11 +9,15 @@
 module_dir = this_dir / module_name
 data_files = list((module_dir / "rbnf").glob("*.xml"))
 
+version_path = module_dir / "VERSION"
+data_files.append(version_path)
+version = version_path.read_text(encoding="utf-8").strip()
+
 # -----------------------------------------------------------------------------
 
 setup(
     name=module_name,
-    version="1.0.0",
+    version=version,
     description="Rule-based number formatting using Unicode CLDR data",
     url="http://github.com/rhasspy/unicode",
     author="Michael Hansen",
diff --git a/tests/test_en.py b/tests/test_en.py
index 4307043..e6747f6 100644
--- a/tests/test_en.py
+++ b/tests/test_en.py
@@ -26,13 +26,17 @@ def test_english():
     # Special rules
     assert engine.format_number(-1) == "minus one"
     assert engine.format_number(float("nan")) == "not a number"
-    assert engine.format_number(float("inf")) == "infinity"
+    assert engine.format_number(float("inf")) == "infinite"
 
     # Fractions
     assert (
         engine.format_number(3.14, ruleset_name=RulesetName.CARDINAL)
         == "three point fourteen"
     )
+    assert (
+        engine.format_number("5.3", ruleset_name=RulesetName.CARDINAL)
+        == "five point three"
+    )
 
     # Ordinals
     assert engine.format_number(99, ruleset_name=RulesetName.ORDINAL) == "ninety-ninth"
diff --git a/tests/test_engine.py b/tests/test_engine.py
index 388eaff..017bf42 100644
--- a/tests/test_engine.py
+++ b/tests/test_engine.py
@@ -43,7 +43,7 @@ def test_find_rule():
     engine.add_rule(20, "twenty[-→→];")
     engine.add_rule(100, "←← hundred[ →→];")
 
-    ruleset = engine.rulesets[DEFAULT_LANGUAGE][RulesetName.DEFAULT]
+    ruleset = engine.rulesets[DEFAULT_LANGUAGE][RulesetName.CARDINAL]
 
     rule_2 = ruleset.find_rule(2)
     assert rule_2 is not None
diff --git a/tests/test_es.py b/tests/test_es.py
new file mode 100644
index 0000000..36830f9
--- /dev/null
+++ b/tests/test_es.py
@@ -0,0 +1,8 @@
+from unicode_rbnf import RbnfEngine
+
+
+def test_german():
+    engine = RbnfEngine.for_language("es")
+    assert engine.format_number(5) == "cinco"
+    assert engine.format_number(2) == "dos"
+    assert engine.format_number(5.2) == "cinco coma dos"
diff --git a/unicode_rbnf/VERSION b/unicode_rbnf/VERSION
new file mode 100644
index 0000000..9084fa2
--- /dev/null
+++ b/unicode_rbnf/VERSION
@@ -0,0 +1 @@
+1.1.0
diff --git a/unicode_rbnf/__init__.py b/unicode_rbnf/__init__.py
index 583e4fa..81419cb 100644
--- a/unicode_rbnf/__init__.py
+++ b/unicode_rbnf/__init__.py
@@ -1,6 +1,13 @@
+from pathlib import Path
+
 from .engine import RbnfEngine, RulesetName
 
+_DIR = Path(__file__).parent
+
+__version__ = (_DIR / "VERSION").read_text(encoding="utf-8").strip()
+
 __all__ = [
+    "__version__",
     "RbnfEngine",
     "RulesetName",
 ]
diff --git a/unicode_rbnf/__main__.py b/unicode_rbnf/__main__.py
new file mode 100644
index 0000000..4cca6c1
--- /dev/null
+++ b/unicode_rbnf/__main__.py
@@ -0,0 +1,29 @@
+import argparse
+
+from unicode_rbnf import RbnfEngine, RulesetName
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--language",
+        choices=RbnfEngine.get_supported_languages(),
+        required=True,
+        help="Language code",
+    )
+    parser.add_argument(
+        "--rule",
+        choices=[v.value for v in RulesetName],
+        help="Ruleset name",
+    )
+    parser.add_argument("number", nargs="+", help="Number(s) to turn into words")
+    args = parser.parse_args()
+
+    engine = RbnfEngine.for_language(args.language)
+    for number_str in args.number:
+        words = engine.format_number(number_str, ruleset_name=args.rule)
+        print(words)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/unicode_rbnf/engine.py b/unicode_rbnf/engine.py
index e766217..0c6fd81 100644
--- a/unicode_rbnf/engine.py
+++ b/unicode_rbnf/engine.py
@@ -3,6 +3,7 @@
 from bisect import bisect_left
 from collections import defaultdict
 from dataclasses import dataclass, field
+from decimal import Decimal
 from enum import Enum
 from math import ceil, floor, isinf, isnan, log, modf
 from pathlib import Path
@@ -13,7 +14,7 @@
 class RulesetName(str, Enum):
     """Names of common rulesets."""
 
-    DEFAULT = "spellout-numbering"
+    NUMBERING = "spellout-numbering"
     VERBOSE = "spellout-numbering-verbose"
     CARDINAL = "spellout-cardinal"
     CARDINAL_VERBOSE = "spellout-cardinal-verbose"
@@ -22,6 +23,10 @@ class RulesetName(str, Enum):
     YEAR = "spellout-numbering-year"
 
 
+DEFAULT_RULESET = RulesetName.NUMBERING
+DEFAULT_RULESET_FOR_LANGUAGE: Final = {
+    "en": RulesetName.CARDINAL,
+}
 DEFAULT_LANGUAGE: Final = "en"
 DEFAULT_TOLERANCE: Final = 1e-8
 SKIP_RULESETS: Final = {"lenient-parse"}
@@ -127,7 +132,7 @@ def parse(value_str: str, text: str, radix: int = 10) -> "Optional[RbnfRule]":
         # Handle special rules
         if value_str == "-x":
             rule = RbnfRule(value=RbnfSpecialRule.NEGATIVE_NUMBER)
-        elif value_str == "x.x":
+        elif value_str in ("x.x", "x,x"):
             rule = RbnfRule(value=RbnfSpecialRule.IMPROPER_FRACTION)
         elif value_str == "NaN":
             rule = RbnfRule(value=RbnfSpecialRule.NOT_A_NUMBER)
@@ -137,7 +142,7 @@ def parse(value_str: str, text: str, radix: int = 10) -> "Optional[RbnfRule]":
             try:
                 rule = RbnfRule(value=int(value_str), radix=radix)
             except ValueError:
-                _LOGGER.error(
+                _LOGGER.debug(
                     "Unrecognized special rule: value=%s, text=%s", value_str, text
                 )
                 return None
@@ -294,7 +299,7 @@ def find_rule(
         if isinf(number):
             return self.special_rules.get(RbnfSpecialRule.INFINITY)
 
-        if (number - int(number)) > DEFAULT_TOLERANCE:
+        if abs(number - round(number)) > DEFAULT_TOLERANCE:
             return self.special_rules.get(RbnfSpecialRule.IMPROPER_FRACTION)
 
         # Numeric rules
@@ -336,6 +341,11 @@ def __init__(self, language: Optional[str] = None) -> None:
         # lang -> ruleset name -> ruleset
         self.rulesets: Dict[str, Dict[str, RbnfRuleSet]] = defaultdict(dict)
 
+    @staticmethod
+    def get_supported_languages() -> List[str]:
+        """Return a list of supported language codes."""
+        return sorted([f.stem for f in _LANG_DIR.glob("*.xml")])
+
     @staticmethod
     def for_language(language: str) -> "RbnfEngine":
         """Load XML rules for a language and construct an engine."""
@@ -360,8 +370,11 @@ def add_rule(
     ) -> Optional[RbnfRule]:
         """Manually add a rule to the engine."""
         language = language or self.language or DEFAULT_LANGUAGE
-        ruleset_name = ruleset_name or RulesetName.DEFAULT
+        ruleset_name = ruleset_name or DEFAULT_RULESET_FOR_LANGUAGE.get(
+            language, DEFAULT_RULESET
+        )
 
+        assert ruleset_name is not None
         ruleset = self.rulesets[language].get(ruleset_name)
         if ruleset is None:
             ruleset = RbnfRuleSet(name=ruleset_name)
@@ -411,7 +424,7 @@ def load_xml(self, root: et.Element, language: Optional[str] = None) -> None:
 
     def format_number(
         self,
-        number: float,
+        number: Union[int, float, str, Decimal],
         ruleset_name: Optional[str] = None,
         radix: Optional[int] = None,
         language: Optional[str] = None,
@@ -429,7 +442,7 @@ def format_number(
 
     def iter_format_number(
         self,
-        number: float,
+        number: Union[int, float, str, Decimal],
         ruleset_name: Optional[str] = None,
         radix: Optional[int] = None,
         language: Optional[str] = None,
@@ -437,13 +450,19 @@ def iter_format_number(
     ) -> Iterable[str]:
         """Format a number using loaded rulesets (generator)."""
         language = language or self.language or DEFAULT_LANGUAGE
-        ruleset_name = ruleset_name or RulesetName.DEFAULT
+        ruleset_name = ruleset_name or DEFAULT_RULESET_FOR_LANGUAGE.get(
+            language, DEFAULT_RULESET
+        )
+
+        if isinstance(number, str):
+            number = Decimal(number)
 
+        assert ruleset_name is not None
         ruleset = self.rulesets[language].get(ruleset_name)
         if ruleset is None:
             raise ValueError(f"No ruleset: {ruleset_name}")
 
-        rule = ruleset.find_rule(number, tolerance=tolerance)
+        rule = ruleset.find_rule(float(number), tolerance=tolerance)
         if rule is None:
             raise ValueError(f"No rule for {number} in {ruleset_name}")
 
@@ -497,9 +516,9 @@ def iter_format_number(
 
 def fractional_to_int(frac_part: float, tolerance: float = DEFAULT_TOLERANCE) -> int:
     """Convert fractional part to int like 0.14000000000000012 -> 14"""
-    frac_int = int(frac_part)
+    frac_int = round(frac_part)
 
-    if (frac_part - frac_int) > tolerance:
+    if abs(frac_part - frac_int) > tolerance:
         return fractional_to_int(frac_part * 10, tolerance=tolerance)
 
     return frac_int