Voice Lab

Compare IndexTTS2 and IndexTTS 2.5 with controlled inputs

Voice Lab puts two live hosted generators on the same page so you can compare model behavior without changing the underlying generation service. For the cleanest A/B test, keep the reference audio and target text identical, then change only one variable at a time.

Hold the voice constant

Upload the same short, clean reference recording in both panels.

Hold the text constant

Paste the same target sentence so wording does not confound the comparison.

Change one variable

Compare model, emotion, language, or pace one factor at a time.

Configuration A

Start with IndexTTS2

Use the same reference audio and target text as Configuration B for a fair comparison.

IndexTTS Online Voice Cloning

Online

Clone a voice, then generate natural speech

Add a short reference voice and the text you want it to speak.

0 / — characters

Model

Choose the IndexTTS model for this generation.

Reference voice

Add 3–30 seconds of clear, single-speaker audio.

Text to speak0 / —

Supports English and Chinese text.Punctuation helps control pauses and delivery.

Output

Waiting

Generated audio will appear here.

Add a reference voice and text to get started.

WAV output · Signed-in generations can be viewed in History.

Configuration B

Start with IndexTTS 2.5

Keep the reference and text fixed, then change one supported control at a time when testing emotion, language, or pace.

IndexTTS Online Voice Cloning

Online

Clone a voice, then generate natural speech

Add a short reference voice and the text you want it to speak.

0 / — characters

Model

Choose the IndexTTS model for this generation.

Reference voice

Add 3–30 seconds of clear, single-speaker audio.

Language

Choose the language of the text for IndexTTS 2.5.

Text to speak0 / —

Supports Chinese, English, Japanese, Spanish, and Arabic text.Punctuation helps control pauses and delivery.

Output

Waiting

Generated audio will appear here.

Add a reference voice and text to get started.

WAV output · Signed-in generations can be viewed in History.

Fair-comparison checklist

Use the same reference clip and the same target text in A and B.
Use a reference with one speaker, little background noise, and no music.
Compare one factor at a time instead of changing model, emotion, and pace together.
Listen for pronunciation, speaker similarity, prosody, stability, and artifacts rather than relying on a single impression.
Repeat important comparisons because generative output can vary between runs.

What this lab does not claim

Voice Lab is a comparison workspace, not a published quality score. We do not invent MOS, speaker-similarity, or naturalness numbers. The benchmark page separates upstream published findings from IndexTTS Online product guidance.

Read the model comparison →Browse source samples →

Generations use the normal IndexTTS Online quota, billing, moderation, storage, and safety pipeline. Use only voice references you have permission to use. See our Terms and Acceptable Use Policy.