Best Text to Speech API Free Tier in 2026: What You Actually Get

Most TTS APIs advertise a free tier in the headline and bury the restrictions in footnotes. Card required. Watermarked output. Rate-limited to unusable. Limited to one language.

This post compares the actual free tiers across the major providers, quantifies what 10,000 characters of audio means in practice, and walks through how to start using Audexum without entering a credit card.

Why Free Tier Matters

Free tiers serve two legitimate purposes:

• Integration testing — You need to know the API works with your stack before paying for it.
• Low-volume production use — Hobby projects, internal tools, and early-stage products often have actual usage that fits comfortably in a free tier.

The difference between a genuinely useful free tier and a marketing checkbox is whether the output is production-quality (no watermarks, no audio artifacts) and whether you can use it without submitting a credit card.

Free Tier Comparison

• ElevenLabs' free plan has had varying card requirements over time. As of 2026, some plan tiers require card verification for API access.
• Google Cloud's 1M free characters apply to their Standard voices. WaveNet and Neural2 voices have a much lower free allocation ($4–$16/1M for premium voices).
• Murf.ai's free plan outputs include a watermark and restrict downloads on some account tiers.
• OpenAI TTS has no free tier at all — you pay from the first character.

What 10,000 Characters Gets You

At a normal reading pace of approximately 130 words per minute and roughly 5 characters per word (including spaces), 10,000 characters works out to:

10,000 chars / 5 chars per word = 2,000 words
2,000 words / 130 words per minute = ~15 minutes of audio

That is enough for:

• A 15-minute podcast episode narration
• A complete product tour voiceover (most run 5–10 minutes)
• 30–40 short notification messages ("Your order shipped", "Payment received")
• A 2,000-word blog post read aloud
• Full narration of a 6–8 page e-learning module

For most integrations, 10,000 characters is sufficient to build, test, and verify the full user flow before committing to a paid plan.

Signup Walkthrough (Audexum)

No card required. The process takes about two minutes.

Step 1: Create an account

Go to audexum.com/signup and click Sign Up. Enter your email and set a password. No trial period — the free tier is permanent.

Step 2: Get your API key

After email confirmation, open the dashboard and go to API Keys. Click "Create key". You will see a key starting with sk_live_. Copy it — it is only shown once.

Step 3: Make your first call

import requests

response = requests.post(
    "https://audexum.com/api/v1/tts",
    headers={
        "Authorization": "Bearer sk_live_abc123xyz",
        "Content-Type": "application/json",
    },
    json={
        "text": "This is a test. The API is working.",
        "voice_id": "en_us_female_01",
    },
)

with open("test.wav", "wb") as f:
    f.write(response.content)

That call consumes 36 characters of your 10,000/month quota.

Step 4: Check your usage

The dashboard shows characters used and remaining for the current billing period. There is also a usage endpoint:

usage = requests.get(
    "https://audexum.com/api/v1/usage",
    headers={"Authorization": "Bearer sk_live_abc123xyz"},
).json()

print(f"Used: {usage['chars_used']:,}")
print(f"Remaining: {usage['chars_remaining']:,}")
print(f"Reset date: {usage['reset_date']}")

Upgrade Path

When the free tier is no longer enough, the upgrade is one click in the dashboard. No migration, no key rotation — the same sk_live_ key works on paid plans.

The Starter plan at €4/month covers 100,000 characters, which is roughly 25 hours of audio per month. That threshold is high enough for most small production apps to stay on it for months.

When to use PAYG

Pay-as-you-go at €8/1M chars is worth considering when:

• Your usage is seasonal (a large batch one month, minimal the next)
• You are building a pipeline that processes documents in bulk and does not need ongoing monthly allocation
• You want to avoid the overhead of choosing a plan tier

There is no minimum spend on PAYG.

Practical Limits to Know

Before you build:

• Request size limit: 5,000 characters per API call. For longer texts, split at sentence boundaries and concatenate the WAV files.
• Rate limit on free tier: 10 requests per minute. Paid plans have higher limits.
• Output format: WAV by default. Pass "format": "mp3" for compressed output.
• No watermarks on any plan: Free tier output is identical in quality to paid tier output.

Bottom Line

If you need to evaluate a TTS API without committing payment details, Audexum is the only major provider that offers 10,000 characters per month with no card, no watermarks, and full language access. The 15 minutes of audio that quota represents is enough to cover most integration and testing scenarios.

Sign up at audexum.com/signup and your key is ready in under two minutes.

• Related: Cheapest text-to-speech API in 2026
• Related: ElevenLabs alternative with a free tier
• Related: Text to speech API Python tutorial

By Petar, founder of Audexum. No credit card required — that is a design decision, not a coincidence.