さあ

さてN3sense 3
さて marks a pause before moving to a new topic or task, while さあ can also be used to urge someone else into action, which さて cannot.
よし sense 2
よし is a short, decisive exclamation of resolve, whereas さあ often stretches the sound to show the speaker steeling themselves before an action.
ほら sense 4
ほら draws attention to something right in front of you, while さあ is used more broadly for the moment something starts, finishes, or a result appears.
どれN5sense 3
どれ is an old-fashioned way to say 'let's see' before checking something, similar to さあ used to express hesitation, but どれ sounds more dated and formal.

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どれどれN1
さあ is a general prompting interjection for urging or hesitating, while どれどれ specifically coaxes someone into showing or trying something with a curious, friendly tone.
いざN1
さあ is a general interjection for prompting, hesitating, or urging, while いざ specifically marks a decisive moment or moment of resolve.
さN2
さあ is a longer interjection used to prompt, hesitate, or draw attention, while さ is its shorter, more abrupt form used to urge someone into action.

Written forms

さあUsage86%
Standard hiragana spelling.
さぁUsage13%
search-only kana form
Search-only kana form; not a standard spelling.
サアUsage1%
サァUsage<1%
サーUsage

The origin is uncertain; it is a native Japanese interjection with no clear kanji or loanword source.

<1%

さー