Get notified about upcoming contests.
Visualize and predict your next AtCoder rating based on hypothetical performance values. This tool helps you understand how different performances can affect your future rating using an interactive graph.
Convert your AtCoder rating into a deviation score (similar to a standardized test score). DevScore lets you see how your rating compares statistically to the rest of the userbase.
Estimate your current AtCoder rating as if you had only participated in ABC, ARC, or AGC contests. AltCoder simulates your alternate rating history to see how each contest series influences your standing.