diff --git a/examples/playground_threading.py b/examples/playground_threading.py
new file mode 100644
index 0000000..501ddff
--- /dev/null
+++ b/examples/playground_threading.py
@@ -0,0 +1,33 @@
+from tqdm import tqdm
+import scgenerator as sc
+import numpy as np
+import time
+
+s = "The file to read. File-like objects must support the".split()
+size = 5
+
+
+def do_stuff(name: str, stuff: int, pbar=tqdm):
+    speed = np.random.rand()
+    for i in pbar(range(size)):
+        time.sleep(speed)
+    return np.arange(size * 4).reshape(size, 4) * len(name) + stuff
+
+
+def main():
+    shape = (len(s), size, 4)
+    out = np.zeros(shape)
+    out_control = np.zeros(shape)
+
+    args = [(el, i) for i, el in enumerate(s)]
+
+    for i, result in sc.threading.apply_with_progress_iter(do_stuff, args, 2):
+        print(i, result)
+        out[i] = result
+    for i, arg in enumerate(args):
+        out_control[i] = do_stuff(*arg)
+    assert np.all(out == out_control)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/scgenerator/threading.py b/src/scgenerator/threading.py
index 6412298..19c4755 100644
--- a/src/scgenerator/threading.py
+++ b/src/scgenerator/threading.py
@@ -345,3 +345,48 @@ def apply_with_progress(
         else:
             all_args = ((arg, bars[i]) for i, arg in enumerate(args))
         return pool.starmap(func, all_args)
+
+
+def _unpack_fn(args):
+    func, ind, *args = args
+    return ind, func(*args)
+
+
+def apply_with_progress_iter(
+    func: Callable[..., T],
+    args: Iterable[Iterable[Any]],
+    n_cpu: int | None = None,
+    n_pertask: int | None = None,
+    unpack: bool = True,
+    desc: str | None = None,
+) -> Iterator[tuple[int, T]]:
+    args = list(args)
+    n_cpu = n_cpu or multiprocessing.cpu_count()
+    with (
+        multiprocessing.Pool(n_cpu) as pool,
+        multibar(n_tasks=len(args), n_show=n_cpu, n_pertask=n_pertask, desc=desc) as bars,
+    ):
+        if unpack:
+            all_args = ((func, i, *arg, bars[i]) for i, arg in enumerate(args))
+        else:
+            all_args = ((func, i, arg, bars[i]) for i, arg in enumerate(args))
+        yield from pool.imap_unordered(_unpack_fn, all_args)
+
+
+def apply_with_progress_fast(
+    pool: multiprocessing.Pool,
+    func: Callable[..., T],
+    args: Iterable[Iterable[Any]],
+    n_cpu: int | None = None,
+    n_pertask: int | None = None,
+    unpack: bool = True,
+    desc: str | None = None,
+) -> list[T]:
+    args = list(args)
+    n_cpu = n_cpu or multiprocessing.cpu_count()
+    with multibar(n_tasks=len(args), n_show=n_cpu, n_pertask=n_pertask, desc=desc) as bars:
+        if unpack:
+            all_args = ((*arg, bars[i]) for i, arg in enumerate(args))
+        else:
+            all_args = ((arg, bars[i]) for i, arg in enumerate(args))
+        return pool.starmap(func, all_args)