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AiTechWorlds
AiTechWorlds
Visualize Tim Sort — the hybrid insertion + merge sort used by Python and Java — with synced code and step explanations.
# Python's built-in sort IS Timsort:
a.sort()
sorted(a)
# Conceptually: detect runs, insertion-sort short runs,
# then merge runs with galloping mode for speed.Tim Sort is a hybrid of Insertion Sort and Merge Sort: it sorts small runs with insertion sort, then merges them. It is the default sort in Python and Java for objects.
| Best | O(n) |
| Average | O(n log n) |
| Worst | O(n log n) |
| Space | O(n) |
| Stable | Yes |
| In-place | No |
The Tim Sort Visualizer animates how Timsort works: it sorts small 'runs' with Insertion Sort, then merges the runs like Merge Sort. Timsort is the default sorting algorithm in Python and Java (for objects). It runs in O(n) best case on data with existing order, O(n log n) average and worst case, is stable, and uses O(n) extra space.
Generate an array
Click New Array or adjust the size slider for a random dataset.
Play the animation
Press Play to watch short runs insertion-sorted, then merged together.
Step and scrub
Step forward/back or drag the timeline to study runs and merges.
Read the synced code
The highlighted pseudocode line tracks the run and merge phases; switch tabs for C++, Java, Python, or JavaScript.
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Last reviewed on June 14, 2026 by the AiTechWorlds Tools Team. All processing runs locally in your browser.