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Sequence Aligner

May 21, 2026 · Updated: May 21, 2026

Perform pairwise global (Needleman-Wunsch) or local (Smith-Waterman) sequence alignment with configurable match, mismatch, and gap penalty scores. Use this tool to compare a newly sequenced gene against a reference, identify conserved domains between homologous proteins, or check primer specificity against off-target templates. The alignment output shows matching residues, gap positions, and percent identity — the dynamic programming matrix with traceback path is also available for understanding how the algorithm arrives at the optimal alignment.

Alignment Visualizer

DNA
Global (Needleman-Wunsch) Local (Smith-Waterman)

Features

  • Global Alignment: Needleman-Wunsch algorithm for full sequence alignment
  • Local Alignment: Smith-Waterman algorithm for local similarity detection
  • Configurable Scoring: Adjustable match, mismatch, and gap penalty scores
  • DNA & Protein: Auto-detection with BLOSUM62 scoring for proteins
  • DP Matrix: Visualize the dynamic programming matrix with traceback path
  • Identity & Similarity: Calculate sequence identity and similarity percentages