Here's a mistake developers and creators make constantly: they pick a voice by reading its name in a dropdown, generate a few thousand lines of audio, and then realize it sounds completely wrong for their project.
Too stiff. Too casual. Wrong energy for the brand. Doesn't match the vibe of the content.
Starting over is expensive — in time, money, and motivation.
LeanVox's Voice A/B Tester exists to stop that mistake before it happens. Pick two voices, enter your actual text, hear them both. Side by side. Before you build anything.
The Taste Test Before You Buy
Think of it like a wine flight, but for AI voices.
You wouldn't order a case of wine without tasting it. You shouldn't generate thousands of lines of audio without hearing the voice on your content first.
The A/B Tester is exactly that: a zero-commitment way to compare two voices on the exact script you're planning to use. Not a demo clip. Not a generic sample sentence. Your words, your tone, your use case.
How It Works
- Pick Voice A and Voice B from the available voice library
- Enter your text — use something representative of your actual project
- Hit play — hear both rendered side by side
- Pick the winner — then go build with confidence
Free to use. No account required.
Available Voices
Standard Voices
| Voice | Character |
|---|---|
| Heart (Female) | Warm, natural, versatile |
| Bella (Female) | Clear, expressive, engaging |
| Michael (Male) | Confident, professional |
| Adam (Male) | Grounded, conversational |
Pro Voices
| Voice | Best For |
|---|---|
| Podcast Casual Male | Conversational shows, vlogs |
| Podcast Conversational Female | Interview-style content, storytelling |
| Narrator Warm Male | Audiobooks, long-form narration |
| Narrator Calm Female | Meditations, explainers, e-learning |
Real Use Cases
Podcast producers — Should your show sound casual or polished? Run your intro script through Podcast Casual Male vs. Narrator Warm Male and the answer becomes obvious.
Audiobook narrators and publishers — Narrator Warm Male and Narrator Calm Female are built for long-form. Test them on a full paragraph, not a single sentence — pacing and breath patterns matter at scale.
Game developers — Character voices are everything. Test multiple voices on the same line of dialogue to nail the personality before you generate hundreds of lines of NPC audio.
Brand teams — Your brand voice is part of your brand. Hear it before you ship it. The difference between Podcast Conversational Female and Heart (Female) may be subtle in a description, but unmistakable in your ears.
App developers — If you're integrating TTS via the LeanVox API, test voices against your actual UI copy before hardcoding a voice ID. Your users will thank you.
Why This Saves You Money
Here's the math: if you're building a 2-hour audiobook, the total cost is manageable. But if you pick the wrong voice and re-generate everything? You've just doubled the cost — and the time.
The A/B Tester is free. Use it. There's no good reason to skip the taste test.
Ready to Build After You Choose?
- LeanVox API docs — integrate TTS directly into your app or pipeline
- Get an API key — free account gets you 200+ minutes, no credit card needed
- PDF to Audio tool — if you need to convert documents, not just raw text
Hear Before You Commit
Two minutes of testing now saves hours of regret later.
Try the Voice A/B Tester free at leanvox.com/tools/voice-ab-tester
No login required. Pick two voices, drop in your text, hit play. The right voice will be obvious.