diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8922767..c77b9fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,9 @@
 + Module `sqlalchemy`: 
     * removed deprecated alias `entity_base()`. use `declarative_base()` instead.
     * fix imports.
-+ Module `functools`: add `cooldown()`
++ Module `functools`: add `cooldown()`, `do_not_flood()`
++ Module `color`: add `ColorFormatter()`
++ Separated `suou[waiter]` dependency from `suou[quart]`
 
 ## 0.12.6
 
diff --git a/pyproject.toml b/pyproject.toml
index 5375510..0982b7e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,9 @@ markdown = [
 ]
 quart = [
     "Quart",
-    "Quart-Schema",
+    "Quart-Schema"
+]
+waiter = [
     "starlette>=0.47.2"
 ]
 quart_auth = [
@@ -78,7 +80,8 @@ full = [
     "suou[quart_auth]", # includes quart, sqlalchemy and quart_sqlalchemy
     "suou[peewee]",
     "suou[markdown]",
-    "suou[sass]"
+    "suou[sass]",
+    "suou[waiter]"
 ]
 
 docs = [
diff --git a/src/suou/__init__.py b/src/suou/__init__.py
index c90e37c..fadb067 100644
--- a/src/suou/__init__.py
+++ b/src/suou/__init__.py
@@ -18,13 +18,14 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 
 from .iding import Siq, SiqCache, SiqType, SiqGen
 from .codecs import (StringCase, cb32encode, cb32decode, b32lencode, b32ldecode, b64encode, b64decode, b2048encode, b2048decode,
-    jsonencode, twocolon_list, want_bytes, want_str, ssv_list, want_urlsafe, want_urlsafe_bytes)
+    jsonencode, twocolon_list, want_bytes, want_str, ssv_list, want_urlsafe, want_urlsafe_bytes,
+    z85encode, z85decode)
 from .bits import count_ones, mask_shift, split_bits, join_bits, mod_ceil, mod_floor
 from .calendar import want_datetime, want_isodate, want_timestamp, age_and_days
 from .configparse import MissingConfigError, MissingConfigWarning, ConfigOptions, ConfigParserConfigSource, ConfigSource, DictConfigSource, ConfigValue, EnvConfigSource
 from .collections import TimedDict
 from .dei import dei_args
-from .functools import deprecated, not_implemented, timed_cache, none_pass, alru_cache, future
+from .functools import deprecated, not_implemented, timed_cache, none_pass, alru_cache, future, cooldown, do_not_flood
 from .classtools import Wanted, Incomplete
 from .itertools import makelist, kwargs_prefix, ltuple, rtuple, additem, addattr
 from .i18n import I18n, JsonI18n, TomlI18n
@@ -32,16 +33,18 @@ from .signing import UserSigner
 from .snowflake import Snowflake, SnowflakeGen
 from .lex import symbol_table, lex, ilex
 from .strtools import PrefixIdentifier
-from .validators import matches, not_less_than, not_greater_than, yesno
+from .validators import matches, not_less_than, not_greater_than, yesno, must_be
 from .redact import redact_url_password
 from .http import WantsContentType
-from .color import OKLabColor, chalk, WebColor, RGBColor, LinearRGBColor, XYZColor, OKLCHColor
+from .color import OKLabColor, chalk, WebColor, RGBColor, LinearRGBColor, \
+        XYZColor, OKLCHColor, ColorFormatter
 from .mat import Matrix
 from .argparse import LetterSubparsers
 
-__version__ = "0.13.0a2"
+__version__ = "0.13.0a4"
 
 __all__ = (
+    'ColorFormatter',
     'ConfigOptions', 'ConfigParserConfigSource', 'ConfigSource', 'ConfigValue',
     'DictConfigSource', 'EnvConfigSource', 'I18n', 'Incomplete', 'JsonI18n',
     'LetterSubparsers', 'LinearRGBColor',
@@ -52,7 +55,7 @@ __all__ = (
     'WebColor', 'XYZColor',
     'addattr', 'additem', 'age_and_days', 'alru_cache', 'b2048decode', 'b2048encode',
     'b32ldecode', 'b32lencode', 'b64encode', 'b64decode', 'cb32encode',
-    'cb32decode', 'chalk', 'count_ones', 'dei_args', 'deprecated',
+    'cb32decode', 'chalk', 'cooldown', 'count_ones', 'dei_args', 'deprecated', 'do_not_flood',
     'future', 'ilex', 'join_bits', 'jsonencode', 'kwargs_prefix', 
     'lex', 'ltuple', 'makelist', 'mask_shift',
     'matches', 'mod_ceil', 'mod_floor', 'must_be', 'none_pass', 'not_implemented',
diff --git a/src/suou/argparse.py b/src/suou/argparse.py
index c235a30..563d6be 100644
--- a/src/suou/argparse.py
+++ b/src/suou/argparse.py
@@ -19,7 +19,7 @@ from __future__ import annotations
 
 import argparse
 import sys
-from typing import Callable, Mapping
+from typing import Callable
 
 class LetterSubparsers(object):
     """
diff --git a/src/suou/color.py b/src/suou/color.py
index 26bf060..5755a9c 100644
--- a/src/suou/color.py
+++ b/src/suou/color.py
@@ -21,6 +21,7 @@ from __future__ import annotations
 
 from collections import namedtuple
 from functools import lru_cache
+import logging
 import math
 
 from suou.functools import deprecated
@@ -331,4 +332,48 @@ class OKLCHColor(namedtuple('_OKLCHColor', 'l c h')):
         return sum(abs(i - j) / k for i, j, k in zip(self, other, (1, 1, 36)))
 
 
-__all__ = ('chalk', 'WebColor', "RGBColor", 'LinearRGBColor', 'XYZColor', 'OKLabColor', 'OKLCHColor')
+class ColorFormatter(logging.Formatter):
+    """
+    Colored logging formatter.
+
+    Opinionated.
+
+    Taken from https://stackoverflow.com/questions/384076/how-can-i-color-python-logging-output
+    """
+
+    def _get_base_format(color):
+        return f"[%(asctime)s] {color('%(levelname)s')}{chalk.grey(': ')}{color('%(name)s')}{chalk.grey(': ')}%(message)s"
+
+    FORMATS = {
+        logging.DEBUG: _get_base_format(chalk.cyan),
+        logging.INFO: _get_base_format(chalk.green),
+        logging.WARNING: _get_base_format(chalk.yellow),
+        logging.ERROR: _get_base_format(chalk.red),
+        logging.CRITICAL: _get_base_format(chalk.bold.red)
+    }
+
+    del _get_base_format
+
+    def format(self, record: logging.LogRecord) -> str:
+        log_fmt = self.FORMATS.get(record.levelno)
+        formatter = logging.Formatter(log_fmt)
+        return formatter.format(record)
+
+    @classmethod
+    def apply_handler(cls, logger: logging.Logger, level = logging.INFO):
+        """
+        Apply the colored formatter to a logger.
+
+        Use this with logging.root, instead of logging.basicConfig().
+        
+        Should not be called more than once.
+        """
+        logger.setLevel(level)
+        ch = logging.StreamHandler()
+        ch.setLevel(level)
+        ch.setFormatter(cls())
+        logger.addHandler(ch)
+
+
+__all__ = ('chalk', 'WebColor', "RGBColor", 'LinearRGBColor', 'XYZColor',
+     'OKLabColor', 'OKLCHColor', 'ColorFormatter')
diff --git a/src/suou/functools.py b/src/suou/functools.py
index dafd0d6..d7d1166 100644
--- a/src/suou/functools.py
+++ b/src/suou/functools.py
@@ -382,6 +382,32 @@ def cooldown(unit: int, /, exception: Exception | None = None):
         return wrapper
     return decorator
 
+def do_not_flood(unit = .25):
+    """
+    Implement a calling cooldown for a function or procedure.
+
+    If the decorated function is called during the cooldown, the function
+    blocks before being called again.
+
+    This is blocking and uses time.sleep().
+    """
+    def decorator(func):
+        @wraps(func)
+        def wrapper(*args, **kwargs):
+            now = time.time()
+            if wrapper.timeout_until is not None and wrapper.timeout_until > now:
+                wrapper.timeout_delay += unit
+                time.sleep(wrapper.timeout_until - now)
+                wrapper.timeout_until = now + wrapper.timeout_delay
+            else:
+                wrapper.timeout_delay = unit
+                wrapper.timeout_until = time.time() + unit
+            return func(*args, **kwargs)
+        wrapper.timeout_until = None
+        wrapper.timeout_delay = unit
+        return wrapper
+    return decorator
+
 __all__ = (
-    'deprecated', 'not_implemented', 'timed_cache', 'none_pass', 'alru_cache', 'cooldown'
+    'deprecated', 'not_implemented', 'timed_cache', 'none_pass', 'alru_cache', 'cooldown', 'do_not_flood'
 )