speedtune

There will always be some margin of error compared to the in-game display because of rounded numbers. Expect values to deviate by around 0.1-1.0 AV to what you see in-game.

Tingyun: Tingyun's E1 makes her ultimate apply a SPD boost to the ally with Benediction, which the tool doesn't track. Please add the "Windfall of Lucky Springs" effect to the desired target manually.

Topaz & Numby: Please add Numby as a separate character "Topaz & Numby (Numby)" if you'd like to simulate Numby's Advance Forwards. You will have to add these events manually to the event sequence.

Jing Yuan: Please add Lightning Lord as a separate character "Jing Yuan (Lightning Lord)" if you'd like to simulate Lightning Lord's Speed Increases. You will have to add these events manually to the event sequence.

If you have any questions or suggestions, join us at discord.gg/komimau.

You can read more about speed on the wiki.

Action Value is the unit of time used in Honkai: Star Rail's combat. It determines the turn order and the time in between turns. The game tracks each character's remaining Action Value according to their Speed and updates it throughout the battle.

Speed is a character stat that determines how fast they can act in battle, it is affected via % bonuses as well as flat bonuses as shown in the following formula:

SPD = Base SPD * (1 + SPD%) + Flat SPD

With this we can calculate a character's Base Action Value, which is the time in between each of their turns. At the start of battle and after each of their turns, each character sets their Action Value to this number according to their own Speed.

Base Action Value = 10000 / SPD

Every character's Action Value decreases by the same amount each turn. Once a character's Action Value reaches 0, they will take their turn.

A character's Action Value can be affected by either Speed modifications, or Action Value changes. Speed modifications can be in the form of % bonuses or flat bonuses, and they can be either permanent or they last for a certain amount of turns.

New Action Value = Old Action Value * (Old SPD / New SPD)

Action Value changes can be in the form of Action Advance or Action Delay, and they take effect immediately. Action Value cannot be lower than 0. In the formula below, the change is negative if it is an Action Advance, and positive if it is an Action Delay:

New Action Value = Old Action Value + Base Action Value * Action Value Change %

Some applications allow characters to "Take Action Immediately". These are not related by the formulas above, as they forcibly set a character's Action Value to 0.

Cycles are a time restriction mechanic used in certain modes like Memory of Chaos and Pure Fiction that force you to complete a stage within a certain amount of Action Value. Cycle 0 lasts for 150 AV, and each subsequent cycle lasts for 100 AV.

When you complete a wave, the next wave will reset your current cycle and start over as if it was Cycle 0.