Best Text to Speech AI for Realistic Voices
Compare the realistic text to speech AI models available on Flixly, including Gemini 3.1 Flash TTS, ElevenLabs and OpenAI TTS. See what each does and how to fit them into a workflow.
TL;DR
Flixly's Text to Speech page offers several speech models: Gemini 3.1 Flash TTS, ElevenLabs Multilingual V2 and Turbo V2.5, OpenAI TTS and TTS HD, and F5-TTS. ElevenLabs Multilingual V2 and F5-TTS also support voice cloning. Each generation's credit cost is quoted before you run it. The best choice depends on your voice, language and script, so test the same paragraph on two or three models.
Text to speech AI converts written text into spoken audio using neural networks trained on large amounts of recorded speech. It is not simple waveform playback or rule-based synthesis.
How neural TTS models generate audio
Modern TTS systems map text to acoustic features, then turn those features into a waveform. Many predict an intermediate representation such as a mel-spectrogram and use a vocoder to produce the final audio; newer models may generate audio more directly.
Training on many speakers is what lets these models handle pacing, emphasis and intonation instead of reading word by word. Quality still varies by model, voice and language, which is why comparing a few is worthwhile.
Inputs and outputs
You supply plain text, choose a model and a voice, and get back an audio file you can download. Longer scripts are easier to manage in sections. Each model shows its own settings in the app, so check what a model offers before relying on a particular control.
Punctuation matters: commas, full stops and paragraph breaks give the model cues for pauses and phrasing, and writing numbers or acronyms the way you want them spoken avoids surprises.
Where these tools fit into production workflows
Podcasters feed scripts into Text to Speech for episode narration. Video editors pair generated tracks with Lip Sync to match mouth movements to the new audio.
Short-form creators generate voiceovers and add them to clips made in the Video Generator. Teams that want a consistent brand voice can create one with Voice Cloning and reuse it across projects, provided they have the rights to that voice.
Model comparison table
| Model | Maker | Text to Speech | Voice Cloning | Credits |
|---|---|---|---|---|
| Gemini 3.1 Flash TTS | Yes | No | quoted in-app | |
| ElevenLabs Multilingual V2 | ElevenLabs | Yes | Yes | quoted in-app |
| ElevenLabs Turbo V2.5 | ElevenLabs | Yes | No | quoted in-app |
| OpenAI TTS / TTS HD | OpenAI | Yes | No | quoted in-app |
| F5-TTS | Open model | Yes | Yes | quoted in-app |
All five are speech models. Video models such as Seedance or Kling generate video, not voices, so they don't belong in a TTS comparison.
Credit costs and practical limits
Every generation draws on your credit balance at a rate the app quotes before you run it. How much audio a balance covers depends on the model, the length of your text and the settings you choose. Credits come in one-time packs listed on the pricing page.
Voice cloning also shows its cost before you start. Use a clean sample and only clone voices you own or have permission to use.
Where to start
Open the Text to Speech page, paste a short test paragraph, and generate it with Gemini 3.1 Flash TTS and one ElevenLabs model. Compare the results by ear, then commit your full script to the one that fits.
Frequently Asked Questions
What kind of sample works best for voice cloning on Flixly?▾
Use a clean recording of a single speaker with no music or background noise, speaking naturally. A longer, varied sample generally gives the model more to work with than a few words.
Which languages does Gemini 3.1 Flash TTS cover?▾
Language and voice options depend on the model and are shown in the Text to Speech settings. Check the list there before committing a script, and test a short line in your target language first.
How should I handle very long scripts?▾
For long scripts, split the text into sections such as paragraphs or chapters, generate each one, then join the files in any audio editor. This also makes it easier to redo a single section.
Does Flixly store generated audio permanently?▾
Your generations appear in your history, but download any audio you want to keep long term rather than relying on the dashboard as storage.
Which is faster, Gemini 3.1 Flash TTS or ElevenLabs?▾
Flixly doesn't publish speed benchmarks between models. Run the same line through Gemini 3.1 Flash TTS and an ElevenLabs model and judge both speed and quality for your use.
