diff --git a/clams/__init__.py b/clams/__init__.py
index 7ead7de..6943815 100644
--- a/clams/__init__.py
+++ b/clams/__init__.py
@@ -3,7 +3,8 @@
 from mmif import __specver__
 
 from clams import develop
-from clams import source
+from clams.mmif_utils import source
+from clams.mmif_utils import rewind
 from clams.app import *
 from clams.app import __all__ as app_all
 from clams.appmetadata import AppMetadata
@@ -23,7 +24,7 @@ def prep_argparser():
         version=version_template.format(__version__, __specver__)
     )
     subparsers = parser.add_subparsers(title='sub-command', dest='subcmd')
-    for subcmd_module in [source, develop]:
+    for subcmd_module in [source, rewind, develop]:
         subcmd_name = subcmd_module.__name__.rsplit('.')[-1]
         subcmd_parser = subcmd_module.prep_argparser(add_help=False)
         subparsers.add_parser(subcmd_name, parents=[subcmd_parser], 
@@ -42,5 +43,7 @@ def cli():
     args = parser.parse_args()
     if args.subcmd == 'source':
         source.main(args)
+    if args.subcmd == 'rewind':
+        rewind.main(args)
     if args.subcmd == 'develop':
         develop.main(args)
diff --git a/clams/app/__init__.py b/clams/app/__init__.py
index 22ff159..c0074be 100644
--- a/clams/app/__init__.py
+++ b/clams/app/__init__.py
@@ -193,10 +193,11 @@ def sign_view(self, view: View, runtime_conf: Optional[dict] = None) -> None:
         :param runtime_conf: runtime configuration of the app as k-v pairs
         """
         # TODO (krim @ 8/2/23): once all devs understood this change, make runtime_conf a required argument
-        warnings.warn("`runtime_conf` argument for ClamsApp.sign_view() will "
-                      "no longer be optional in the future. Please just pass "
-                      "`runtime_params` from _annotate() method.",
-                      FutureWarning, stacklevel=2)
+        if runtime_conf is None:
+            warnings.warn("`runtime_conf` argument for ClamsApp.sign_view() will "
+                          "no longer be optional in the future. Please just pass "
+                          "`runtime_params` from _annotate() method.",
+                          FutureWarning, stacklevel=2)
         view.metadata.app = self.metadata.identifier
         if runtime_conf is not None:
             if self._RAW_PARAMS_KEY in runtime_conf:
diff --git a/clams/mmif_utils/__init__.py b/clams/mmif_utils/__init__.py
new file mode 100644
index 0000000..4ece749
--- /dev/null
+++ b/clams/mmif_utils/__init__.py
@@ -0,0 +1,3 @@
+from clams.mmif_utils import rewind
+from clams.mmif_utils import source
+
diff --git a/clams/mmif_utils/rewind.py b/clams/mmif_utils/rewind.py
new file mode 100644
index 0000000..63bb3ea
--- /dev/null
+++ b/clams/mmif_utils/rewind.py
@@ -0,0 +1,135 @@
+import argparse
+import sys
+import textwrap
+from pathlib import Path as P
+
+import mmif
+
+
+def is_valid_choice(choice):
+    try:
+        ichoice = int(choice)
+        if 0 <= ichoice:
+            return ichoice
+        else:
+            raise ValueError(f"\nInvalid argument for -n. Please enter a positive integer.")
+    except ValueError:
+        raise argparse.ArgumentTypeError(f"\nInvalid argument for -n. Please enter a positive integer.")
+
+def user_choice(mmif_obj:mmif.Mmif) -> int:
+    """
+    Function to ask user to choose the rewind range.
+
+    :param mmif_obj: mmif object
+    :return: int option number
+    """
+
+    ## Give a user options (#, "app", "timestamp") - time order
+    n = len(mmif_obj.views)
+    i = 0  # option number
+    # header
+    print("\n" + "{:<4} {:<30} {:<100}".format("num", "timestamp", "app"))
+    for view in mmif_obj.views:
+        option = "{:<4} {:<30} {:<100}".format(n-i, str(view.metadata.timestamp), str(view.metadata.app))
+        print(option)
+        i += 1
+
+    ## User input
+    while True:
+        choice = int(input("\nEnter the number to delete from that point by rewinding: "))
+        try:
+            if 0 <= choice <= n:
+                return choice
+            else:
+                print(f"\nInvalid choice. Please enter an integer in the range [0, {n}].")
+        except ValueError:
+            print("\nInvalid input. Please enter a valid number.")
+
+
+def rewind_mmif(mmif_obj: mmif.Mmif, choice: int, choice_is_viewnum: bool = True) -> mmif.Mmif:
+    """
+    Rewind MMIF by deleting the last N views. 
+    The number of views to rewind is given as a number of "views", or number of "producer apps". 
+    By default, the number argument is interpreted as the number of "views". 
+    Note that when the same app is repeatedly run in a CLAMS pipeline and produces multiple views in a row,
+    rewinding in "app" mode will rewind all those views at once.
+
+    :param mmif_obj: mmif object
+    :param choice: number of views to rewind
+    :param choice_is_viewnum: if True, choice is the number of views to rewind. If False, choice is the number of producer apps to rewind.
+    :return: rewound mmif object
+
+    """
+    if choice_is_viewnum:
+        for vid in list(v.id for v in mmif_obj.views)[-1:-choice-1:-1]:
+            mmif_obj.views._items.pop(vid)
+    else:
+        app_count = 0
+        cur_app = ""
+        vid_to_pop = []
+        for v in reversed(mmif_obj.views):
+            vid_to_pop.append(v.id)
+            if app_count >= choice:
+                break
+            if v.metadata.app != cur_app:
+                app_count += 1
+                cur_app = v.metadata.app
+        for vid in vid_to_pop:
+            mmif_obj.views._items.pop(vid)
+    return mmif_obj
+
+
+def describe_argparser():
+    """
+    returns two strings: one-line description of the argparser, and addition material, 
+    which will be shown in `clams --help` and `clams <subcmd> --help`, respectively.
+    """
+    oneliner = 'provides CLI to rewind a MMIF from a CLAMS pipeline.'
+    additional = textwrap.dedent("""
+    MMIF rewinder rewinds a MMIF by deleting the last N views.
+    N can be specified as a number of views, or a number of producer apps. """)
+    return oneliner, oneliner + '\n\n' + additional
+
+
+def prep_argparser(**kwargs):
+    parser = argparse.ArgumentParser(description=describe_argparser()[1], formatter_class=argparse.RawDescriptionHelpFormatter, **kwargs)
+    parser.add_argument("mmif_file", nargs=1, help="Path to the input MMIF file, or '-' to read from stdin.")
+    parser.add_argument("-o", '--output', default=None, metavar="PATH", help="Path to the rewound MMIF output file. When not given, the rewound MMIF is printed to stdout.")
+    parser.add_argument("-p", '--pretty', action='store_true', help="Pretty-print rewound MMIF. True by default")
+    parser.add_argument("-n", '--number', default="0", type=is_valid_choice, help="Number of views to rewind (default: interactive mode)")
+    parser.add_argument("-m", '--mode', choices=['app', 'view'], default='view', help="Number of views to rewind (default: interactive mode)")
+    return parser
+
+
+def main(args):
+    mmif_obj = mmif.Mmif(sys.stdin) if args.mmif_file[0] == '-' else mmif.Mmif(open(args.mmif_file[0]).read())
+
+    if args.number == 0: # If user doesn't know how many views to rewind, give them choices.
+        choice = user_choice(mmif_obj)
+    else:
+        choice = args.number
+
+    
+    if args.output:
+        # Check if the same file name exist in the path and avoid overwriting.
+        output_fp = P(args.output)
+        if output_fp.is_file():
+            parent = output_fp.parent
+            stem = output_fp.stem
+            suffix = output_fp.suffix
+            count = 1
+            while (parent / f"{stem}_{count}{suffix}").is_file():
+                count += 1
+            output_fp = parent / f"{stem}_{count}{suffix}"
+        
+        out_f = open(output_fp, 'w')
+    else:
+        out_f = sys.stdout
+    out_f.write(rewind_mmif(mmif_obj, choice, args.mode == 'view').serialize(pretty=args.pretty))
+
+
+if __name__ == "__main__":
+    parser = prep_argparser()
+    args = parser.parse_args()
+    main(args)
+
diff --git a/clams/source/__init__.py b/clams/mmif_utils/source.py
similarity index 100%
rename from clams/source/__init__.py
rename to clams/mmif_utils/source.py
diff --git a/tests/test_clamscli.py b/tests/test_clamscli.py
index 88b241f..89a3deb 100644
--- a/tests/test_clamscli.py
+++ b/tests/test_clamscli.py
@@ -1,10 +1,15 @@
+import contextlib
+import copy
 import io
 import os
 import unittest
-import contextlib
-import clams
-from clams import source
+
 from mmif.serialize import Mmif
+from mmif.vocabulary import DocumentTypes, AnnotationTypes
+
+import clams
+from clams.mmif_utils import rewind
+from clams.mmif_utils import source
 
 
 class TestCli(unittest.TestCase):
@@ -105,5 +110,106 @@ def test_generate_mixed_scheme(self):
         self.assertTrue('file' in schemes)
 
 
+class TestRewind(unittest.TestCase):
+    def setUp(self):
+        self.dummy_app_one = ExampleApp()
+        self.dummy_app_one.metadata.identifier = "dummy_app_one"
+        self.dummy_app_two = ExampleApp()
+        self.dummy_app_two.metadata.identifier = "dummy_app_two"
+
+        # mmif we add views to
+        self.mmif_one = Mmif(
+            {
+                "metadata": {"mmif": "http://mmif.clams.ai/1.0.0"},
+                "documents": [],
+                "views": [],
+            }
+        )
+
+        # baseline empty mmif for comparison
+        self.empty_mmif = Mmif(
+            {
+                "metadata": {"mmif": "http://mmif.clams.ai/1.0.0"},
+                "documents": [],
+                "views": [],
+            }
+        )
+
+    def test_view_rewind(self):
+        """
+        Tests the use of "view-rewiding" to remove multiple views from a single app.
+        """
+        # Regular Case
+        mmif_added_views = self.dummy_app_one.mmif_add_views(self.mmif_one, 10)
+        self.assertEqual(len(mmif_added_views.views), 10)
+        rewound = rewind.rewind_mmif(mmif_added_views, 5)
+        self.assertEqual(len(rewound.views), 5)
+        # rewinding is done "in-place"
+        self.assertEqual(len(rewound.views), len(mmif_added_views.views))
+
+    def test_app_rewind(self):
+        # Regular Case
+        app_one_views = 3 
+        app_two_views = 2
+        app_one_out = self.dummy_app_one.mmif_add_views(self.mmif_one, app_one_views)
+        app_two_out = self.dummy_app_two.mmif_add_views(app_one_out, app_two_views)
+        self.assertEqual(len(app_two_out.views), app_one_views + app_two_views)
+        rewound = rewind.rewind_mmif(app_two_out, 1, choice_is_viewnum=False)
+        self.assertEqual(len(rewound.views), app_one_views)
+        
+def compare_views(a: Mmif, b: Mmif) -> bool:
+    perfect_match = True
+    for view_a, view_b in zip(a.views, b.views):
+        if view_a != view_b:
+            perfect_match = False
+    return perfect_match
+
+
+class ExampleApp(clams.app.ClamsApp):
+    """This is a barebones implementation of a CLAMS App
+    used to generate simple Views within a mmif object
+    for testing purposes. The three methods here all streamline
+    the mmif annotation process for the purposes of repeated insertion
+    and removal.
+    """
+
+    app_version = "lorem_ipsum"
+
+    def _appmetadata(self):
+        pass
+
+    def _annotate(self, mmif: Mmif, message: str, idx: int, **kwargs):
+        if type(mmif) is not Mmif:
+            mmif_obj = Mmif(mmif, validate=False)
+        else:
+            mmif_obj = mmif
+
+        new_view = mmif_obj.new_view()
+        self.sign_view(new_view, runtime_conf=kwargs)
+        self.gen_annotate(new_view, message, idx)
+
+        d1 = DocumentTypes.VideoDocument
+        d2 = DocumentTypes.from_str(f"{str(d1)[:-1]}99")
+        if mmif.get_documents_by_type(d2):
+            new_view.new_annotation(AnnotationTypes.TimePoint, "tp1")
+        if "raise_error" in kwargs and kwargs["raise_error"]:
+            raise ValueError
+        return mmif
+
+    def gen_annotate(self, mmif_view, message, idx=0):
+        mmif_view.new_contain(
+            AnnotationTypes.TimeFrame, **{"producer": "dummy-producer"}
+        )
+        ann = mmif_view.new_annotation(
+            AnnotationTypes.TimeFrame, "a1", start=10, end=99
+        )
+        ann.add_property("f1", message)
+
+    def mmif_add_views(self, mmif_obj, idx: int):
+        """Helper Function to add an arbitrary number of views to a mmif"""
+        for i in range(idx):
+            mmif_obj = self._annotate(mmif_obj, message=f"message {i}", idx=idx)
+        return mmif_obj
+
 if __name__ == '__main__':
     unittest.main()