SpeechifyAI vs Inworld

Inworld sells a three-model quality-and-price ladder built to sit inside their character runtime, where the rate changes with the model you pick. SpeechifyAI bills every Simba model at one plan rate, from $6 per 1M characters, and the top one is #1 on the Artificial Analysis Speech Arena.

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The bottom line

Simba 3.2 is #1 on the Artificial Analysis Speech Arena, a blind test where listeners pick the better voice without being told which vendor made it. Inworld's best model, Realtime TTS 1.5 Max, ranks 7th. SpeechifyAI starts at $10 per 1M characters; Inworld's best starts at $35, and only reaches $17.50 on their $1,500 per month Growth plan.

Simba 3.2 on the Artificial Analysis blind listening arena. Inworld's best is 7th

$10

Per 1M characters for our best model. Inworld's best starts at $35

$499

Monthly plan that reaches our $6 floor. Inworld's floor needs $1,500

1 rate

Every Simba model bills the same per character. Inworld's rate changes per model

SpeechifyAI

Inworld

Claim by claim

Each row states the claim and the number it rests on. The cells are a verdict, not a sales sentence.

SpeechifyAI vs Inworld, claim by claim, with a three-state verdict per side
Claim	SpeechifyAI	Inworld
Blind listener rating. Simba 3.2 is #1 at Elo 1,229 (±16); Inworld's best is 7th at 1,196.	Strong	Average
Entry price for the vendor's best model: $10 against $35 per 1M characters.	Strong	Weak
Monthly platform fee needed to reach the floor rate: $499 against $1,500.	Strong	Weak
One rate whichever model you call. Simba 3.2, 3.0 and 1.6 all bill at the plan rate; Inworld's rate changes with the model.	Strong	Weak
The cheapest way in. Inworld's lowest-priced model is $15 per 1M on their free plan and 17th on the board; our top-rated model is $10.	Strong	Average
Language coverage. Inworld publishes 100+ languages; we cover 30+ on Simba 1.6 and stream 7 locales on Simba 3.0.	Average	Strong
Release cadence on the board. Simba 3.0 entered at Elo 1,121; Simba 3.2 now holds #1 at Elo 1,229. Inworld's Realtime TTS-2 entered at 9th, Elo 1,189, while in research preview.	Strong	Strong
Voice cloning with no per-voice setup fee. Both vendors include it and bill only for synthesis.	Strong	Strong

Ratings from the Artificial Analysis Speech Arena, a blind listener-preference board of 92 models. Prices from each vendor's published pricing page. All figures read 30 July 2026.

Which should you choose?

You want the highest-rated voice at a price you can forecast

Simba 3.2 is #1 on the board and bills flat per character. No platform fee gates the rate.

Pick

SpeechifyAI

You need broad language coverage, or one voice that carries across languages

They publish 100+ languages with cross-lingual voices. We cover 30+ locales on Simba 1.6 without streaming, or 7 streaming on Simba 3.0, so past that set they are the better fit.

Pick

Inworld

You are already building characters or NPCs on Inworld's runtime

Their TTS is one part of a character platform. If you use the rest of it, staying inside one vendor has real value.

Pick

Inworld

Your volume is high and you will not sign a monthly commit for the good rate

Our floor is $6 per 1M on a $499 per month plan. Inworld's floor for their comparable model is $17.50 on $1,500 per month.

Pick

SpeechifyAI

What will text-to-speech cost at your volume?

SpeechifyAI is one flat rate per character. Most providers bill by quality tier, or by credits that convert to characters at a rate that shifts with your plan. Drag your monthly volume and switch the provider to see the difference. Rates are from each vendor's public pricing.

Your monthly volume

10 million characters / mo

≈ 1.7 million words

1M chars200M chars

Compare against

SpeechifyAI · flat rate one rate

$100 /mo

$10/1M PAYG · from $6/1M on Scale

Flat per-character billing
Voice cloning included
Commercial use on every plan
No credits, no token math

The same rate whatever the script. No tier picker, no credit math.

Inworld · Realtime TTS 1.5 Max

$350 /mo

Realtime TTS 1.5 Max on the free On-Demand plan; $17.50 only on Growth at $1,500/mo

3.5×

the SpeechifyAI rate per character

Rates vary by plan tier, model, and annual commitment.

SpeechifyAI at $10/1M characters on pay-as-you-go, dropping to $6 per 1M on Scale. Competitor rates are the neural / quality tier most teams ship on; standard tiers are cheaper but noticeably lower quality.

Cost at common volumes

Monthly volume	SpeechifyAI ($10/1M)	Inworld ($35/1M)	You save
1M chars	$10/mo	~$35/mo	$25/mo $300/yr
10M chars	$100/mo	~$350/mo	$250/mo $3,000/yr
100M chars	$1,000/mo	~$3,500/mo	$2,500/mo $30,000/yr

Where each of us wins

Where SpeechifyAI wins

Rating. Simba 3.2 is #1 at Elo 1,229; Inworld's best is 7th at 1,196, 33 points back.
Entry rate. Our $10 per 1M undercuts both their $35 entry and their $17.50 floor.
One rate per model. Simba 3.2, 3.0 and 1.6 are all billed at the plan rate on one API, so picking a model is a capability decision, not a pricing one, and no $1,500 monthly precondition gates the rate.

Where Inworld wins

Language coverage. They publish 100+ languages with cross-lingual voices. We cover 30+ locales on Simba 1.6 without streaming, or 7 streaming on Simba 3.0.
Character runtime. Their TTS is one piece of a game and NPC platform we are not trying to replace.
Instant cloning from less audio. They clone from 5 to 15 seconds of reference audio; our personal-voice clone asks for 10 to 30.

SpeechifyAI vs Inworld, in plain English

The rate you read is not the rate you get until you pay the platform fee

Inworld publishes per-model rates across five plans. Realtime TTS 1.5 Max, their best-rated model, is $35 per 1M characters on the free On-Demand plan. It falls to $25 on Creator at $25 a month, $22.50 on Builder at $100, $20 on Developer at $300, and $17.50 on Growth at $1,500. The headline number halves, but only behind $1,500 a month of platform fee. Our ladder is $10 to $8 to $6 per 1M, with the $6 floor on a $499 plan, and our entry rate sits below their floor before either platform fee is counted.

Their cheapest model is not competing with ours

Realtime TTS 1.5 Mini is the rate that gets quoted in roundups: $15 per 1M on the free plan, $7 on Growth. On the Artificial Analysis Speech Arena that model sits 17th at Elo 1,133. Simba 3.2 is 96 Elo points above it at $10 per 1M, on a plan with no monthly fee. Compare like for like and their ladder never lands below ours: their $7 needs Growth at $1,500 a month, ours is $6 on a $499 plan. Their cheapest model costs more than our best one until you have paid them $1,500.

Frequently asked questions

Is Inworld or SpeechifyAI better rated for voice quality?

On the Artificial Analysis Speech Arena, a blind listener-preference leaderboard, Simba 3.2 is #1 of 92 models at Elo 1,229 (±16). Inworld's highest-rated model, Realtime TTS 1.5 Max, is 7th at Elo 1,196, and Realtime TTS-2 is 9th at 1,189. Verified 30 July 2026.

How much does Inworld TTS cost per million characters?

Inworld prices per model and per plan. Realtime TTS 1.5 Max runs $35 per 1M characters on the free On-Demand plan down to $17.50 on the $1,500 per month Growth plan. TTS-2 runs $25 down to $12.50, and TTS 1.5 Mini runs $15 down to $7. SpeechifyAI is $10 per 1M on Starter, $8 on Pro and $6 on Scale.

Do I need a paid plan to get Inworld's lowest TTS rate?

Yes. Inworld's floor rates require the Growth plan at $1,500 per month, because the rate for a given model changes with the plan you are on, so the published low number is not available on the free tier. SpeechifyAI's $6 per 1M floor sits on the $499 per month Scale plan, and the $10 entry rate needs no commitment.

Which one should I use for a real-time voice agent?

Both stream. Simba 3.2 is the highest-rated model on the board, and SpeechifyAI also sells voice agents at one all-in per-minute rate with the LLM and speech-to-text included. Inworld's TTS is designed to sit inside their own character runtime, which is the better fit if you are already building there.

The verdict

Inworld covers far more languages than we do, and past our 30+ locales, or if you need one voice that carries across them, they are the better vendor. If you want the highest-rated voice on the board at a rate that does not change with the model you call or depend on a $1,500 monthly commit, Simba 3.2 is #1 on Artificial Analysis from $6 per 1M characters.

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More comparisons

vs ElevenLabs vs Google Cloud Text-to-Speech vs Microsoft Azure Text to Speech vs Amazon Polly vs Deepgram Aura vs Cartesia Sonic vs PlayHT vs OpenAI Text-to-Speech vs Rime vs Hume Octave

Sources

All read 30 Jul 2026

inworld.ai/pricing , per-model, per-plan TTS rates
inworld.ai/tts , language coverage and voice-cloning terms
artificialanalysis.ai/text-to-speech/leaderboard/provider-voice , ranks, Elo and confidence intervals
/pricing , Starter, Pro and Scale character rates
/models , the Simba model lineup and what each one is for