Gemini TTS

A GUIDE TO SCRIPT-BASED AUDIO

Gemini TTS vs Grok TTS

Choosing a voice for a video, story, or dialogue? Compare the documented capabilities of Gemini TTS and Grok TTS, explore listening options, and find a practical way to turn your script into downloadable audio.

Published by geminitts.app, a Gemini speech studio. Official documentation checked October 16, 2026.

Listen to Gemini and Grok

Documentation comparison · no quality ranking

Flash · English

A demonstration generated for this site · 2026-10-08

Read the full transcript

A first draft makes an idea easier to discuss. Choose one person who needs the result, then write a short example of what they would do. Read it aloud and remove any sentence that repeats the point. Share that version before adding more detail. The useful question is not whether the draft contains everything. It is whether someone can understand the next step and explain why it matters.

An existing Gemini recording from this studio. It demonstrates one passage, not every voice or language.

Grok · Luna · English

Official xAI sample · checked 2026-10-17

Read the Grok transcript

Close your eyes and listen for a moment. Every voice tells a story, and every story deserves to be heard. Wherever you are in the world, I'm glad you're here.

Source and more Grok voices

Hosted by xAI. Different scripts and voices: this is a voice demonstration, not a matched quality comparison. This studio generates Gemini audio only.

Compare the documented capabilities

These are model and official API capabilities. Website controls and account limits can differ. The Gemini studio’s own limits are explained below.

What goes in and out

GEMINI TTS

Written text in, generated speech out. Separate from the Gemini Live API.

GROK TTS

Written text in, generated speech out. Separate from the Grok Voice Agent API.

Voice selection

GEMINI TTS

Prebuilt voices and documented custom-voice options. Availability depends on the model and workflow.

GROK TTS

Built-in voices and documented custom-voice options. Check the current voice catalog before integrating.

Scripted dialogue

GEMINI TTS

The 3.8 TTS documentation supports up to two prebuilt speakers in a single request.

GROK TTS

The TTS quickstart selects one voice per request. Multi-character workflow support is not verified here.

Delivery controls

GEMINI TTS

Model-specific instructions for style and delivery. Follow the schema for the selected TTS version.

GROK TTS

Speech tags and voice controls guide delivery. Tag syntax differs from Gemini; do not copy settings blindly.

Audio output

GEMINI TTS

The official API documents WAV and raw PCM options; the integration determines the delivered file.

GROK TTS

The official TTS API documents MP3, WAV and other formats, with output settings in the request.

Where to explore

GEMINI TTS

Google provides official documentation and tooling. This site offers a separate Gemini browser studio.

GROK TTS

xAI provides an official voice playground and API. Third-party browser tools may offer their own workflows.

Choose for the recording you need

For narration, start with the voice and the passage rather than a leaderboard. Listen for names, numbers, pauses and whether the delivery fits your audience. A good short sample is a starting point, not proof of consistency across an entire book. Try a representative paragraph before preparing a longer script.

For a two-character exchange, check how you assign each turn and whether the output meets your editing needs. The Gemini studio here lets you choose two voices and enter ordered lines. It produces a combined recording, not separate speaker tracks. If you need a Grok-specific voice, explore the official playground and confirm the workflow there.

For software integration, compare the official APIs, limits and output requirements directly. Both providers offer developer tooling; neither should be reduced to a single third-party interface. If you prefer a browser workflow, this site is one option for Gemini. It does not run Grok or move your xAI account, voices or balance into Gemini.

A Gemini workflow you can use here

Preview the 30 preset voices, choose Flash or Flash-Lite, and enter your script. Use one narrator or two named speakers with up to 5,000 submitted characters in total. The limit applies to the combined script, not to each turn. Longer projects need separate requests and your own editing; this studio does not automatically split a book into chapters.

Listening to existing samples and loading a template do not generate audio or spend credits. Sign in when you are ready to generate, check the estimate, then listen to the completed take and download its WAV file. Applying a new template asks before replacing an existing draft. Keep your approved audio and settings for the next recording.

Browse the 30 Gemini voices →

Compare costs without mixing the units

Official API charges and this website’s credits are different purchases. An API quote does not describe the price of a browser subscription, and a real-time voice conversation’s per-minute rate is not a standalone TTS quote. Check each provider’s current pricing and the specific endpoint before estimating a project.

Here, each started block of 100 submitted characters contributes to the estimate. The examples below use the studio’s pricing calculation for the same text length. Editing a script or changing models can change that estimate. These figures are application credits, not dollar quotes or promises about how many minutes of audio a passage will produce.

Generating another take is a new request. Budget for revisions rather than assuming every first take will suit the final edit. Check the live estimate before submitting, and review current credit options and purchase availability on the pricing page. For long-form work, test a small excerpt first so you can judge both the reading and the effort needed to finish the file.

500 submitted characters · one request

Flash
6 credits
Flash-Lite
4 credits
See this site’s pricing and credits →

Is Grok Voice 3.0 the same as Grok TTS?

Grok Voice 3.0 is a speech-to-speech release for real-time conversations, including voice-agent workflows. Grok also provides a dedicated text-to-speech API for synthesizing written text. This page focuses on that script-to-audio task. A conversational benchmark measures different things from a narrator reading your script.

If you need microphone input, interruptions, tool use or a live customer-support agent, consult the voice-agent documentation. This Gemini studio prepares recordings from written scripts; it is not a replacement for a live conversation service. Choose the product category first, then compare the voices and implementation details within it.

Read the Grok Voice 3.0 announcement

Questions before you choose

Can I listen to voices before signing up?

You can listen to the existing Gemini samples on this site without signing in or spending credits. Generating your own text is a separate action and requires an account and sufficient credits. The Grok player uses an official xAI sample hosted by xAI. For your own text, visit the official playground and check its current access conditions.

Do I need to write code to try either option?

No code is needed to use this Gemini studio. Grok also has an official playground, and other services may provide browser interfaces. Building a custom API integration is a different task. Compare the actual interface you plan to use, not just the underlying model.

Can I download the generated audio?

Completed recordings in this studio offer a WAV download. Grok’s TTS API also returns audio that can be saved, with documented output-format options. Download behavior in a particular Grok app or third-party interface depends on that product; do not assume every interface exposes the same controls.

Does generating another take use more credits?

Yes, a new generation in this studio is a separate request with its own estimate. Previewing an existing sample or applying a template does not generate another take. Check the pricing page for current credit options and purchase availability, and the studio estimate for your selected model and script.

Can I use Grok voices on geminitts.app?

No. This studio provides Gemini Flash and Flash-Lite speech generation. Grok resources on this page are external references, not an additional model selector. If you specifically need a Grok voice, follow the official xAI links; the Gemini sample is not a recreation of that voice.

Give your next draft a voice

Open an editable narration example in the Gemini studio. Loading the script is free; generating your own take requires signing in and credits.

Try this script with Gemini →