Inworld combines real-time TTS with broad multilingual coverage and a character runtime. SpeechifyAI focuses on expressive developer speech. On Artificial Analysis's dated full provider-voice board, Simba 3.2 and Inworld Realtime TTS-2 sit inside overlapping confidence intervals; their clearest difference is production economics.
Artificial Analysis's full provider-voice board, read 23 Sep 2026, puts Simba 3.2 at Elo 1237 +/-14 and Inworld Realtime TTS-2 at Elo 1245 +/-18. Their 95% confidence intervals overlap, so this benchmark does not establish a decisive quality winner. Artificial Analysis normalizes their prices to $6.60 and $20.80 per 1M characters respectively; those are external estimates, not billed rates. On published plans, SpeechifyAI Starter is $10/month with additional usage at $10/1M, and Scale is $499/month with additional usage at $6/1M. Inworld Growth is $1,500/month and includes $1,500 in credits. Realtime TTS-2 draws from that balance at $12.50/1M characters, then continues at the same rate after the included credits are used.
Each row states the claim and the number it rests on. The cells are a verdict, not a sales sentence.
| Claim | SpeechifyAI | Inworld |
|---|---|---|
| Blind listener preference on the full provider-voice board, read 23 Sep 2026: Simba 3.2 at 1237 +/-14; Inworld Realtime TTS-2 at 1245 +/-18. The 95% confidence intervals overlap. | Strong | Strong |
| Artificial Analysis-normalized price on the same reading: $6.60 against $20.80 per 1M characters. These are comparison estimates, not invoices. | Strong | Average |
| Published scale plans: SpeechifyAI $499/month with $6/1M additional usage; Inworld Realtime TTS-2 is $12.50/1M on Growth, whose $1,500 monthly fee includes $1,500 in credits. | Strong | Weak |
| Paid entry on SpeechifyAI: Starter is $10/month with additional usage at $10/1M characters. | Strong | Average |
| Multilingual breadth. Inworld is built for broad cross-lingual speech; SpeechifyAI's current self-serve multilingual model covers 6 languages across 7 locales. | Average | Strong |
| Product breadth beyond TTS. Inworld's character runtime is valuable when speech is one part of an NPC or game stack; SpeechifyAI is the focused speech API. | Average | Strong |
| Real-time synthesis and voice cloning. Both vendors support streaming speech and cloned voices; evaluate each workflow with your own voices and content. | Strong | Strong |
Quality scores and normalized comparison prices come from the cited benchmark and its methodology, not from a billing quote. Published usage rates and plan terms come from each vendor. See the dated evidence and live sources. Plan rates read 20 September 2026; board readings carry their own dates.
Compare character volume at the listed usage rates. This is a usage-value estimate, not a monthly bill: subscription fees, included balances, discounts, and taxes are excluded. Your plan determines the rate and balance available to you.
Usage only. Your subscription fee and included balance are not applied here.
the SpeechifyAI rate per character
Rates vary by plan tier, model, and annual commitment.
SpeechifyAI is shown at $10/1M characters on pay-as-you-go. The Scale usage rate starts at $6 per 1M with a paid subscription. Competitor rates reflect the listed model or tier, not every available plan. See plan fees and included balances.
| Monthly volume | SpeechifyAI ($10/1M) | Inworld ($12.50/1M) | Rate difference |
|---|---|---|---|
| 1M chars | $10/mo | ~$12.50/mo | $2.50/mo$30/yr |
| 10M chars | $100/mo | ~$125/mo | $25/mo$300/yr |
| 100M chars | $1,000/mo | ~$1,250/mo | $250/mo$3,000/yr |
In the dated Artificial Analysis full provider-voice board, Simba 3.2 scores 1237 +/-14 and Inworld Realtime TTS-2 scores 1245 +/-18. Those 95% confidence intervals overlap. The honest read is a frontier quality cluster, not a decisive winner. Artificial Analysis explains the pairwise Elo and interval calculation in its TTS methodology.
Artificial Analysis puts both models onto one normalized cost model: $6.60/1M for Simba 3.2 and $20.80/1M for Inworld Realtime TTS-2. Those estimates help compare vendors, but they are not invoice lines. Our published plans start with Starter at $10/month with additional usage at $10/1M and reach $6/1M additional usage on Scale at $499/month. Inworld publishes Realtime TTS-2 at $12.50/1M on Growth. That plan is $1,500/month, includes $1,500 in credits, and applies the same rate after those credits are used. Compare the plan fee, included balance, and subsequent usage together.
The dated Artificial Analysis full provider-voice board does not show a decisive winner. Simba 3.2 scores 1237 +/-14; Inworld Realtime TTS-2 scores 1245 +/-18. Their 95% confidence intervals overlap. Read 23 Sep 2026.
Inworld prices by model and plan. Realtime TTS-2 is $12.50 per 1M characters on Growth. The $1,500 monthly fee includes $1,500 in credits, and the same rate applies after those credits are used. Artificial Analysis separately normalizes it to $20.80/1M for cross-vendor comparison; that estimate is not a billed rate.
SpeechifyAI Starter is $10/month with additional usage at $10 per 1M characters. Scale is $499/month with additional usage at $6 per 1M. Included usage differs by plan, so compare the subscription, included balance, and subsequent usage together.
Both support real-time streaming. Choose SpeechifyAI for the English quality-cost position and a focused speech API. Choose Inworld when broad multilingual coverage or its integrated character runtime is more important. Test your own voices, content, region, and connection pattern before deciding.
The full provider-voice board as read 23 Sep 2026 does not establish a decisive quality winner: Simba 3.2 is 1237 +/-14, and Inworld Realtime TTS-2 is 1245 +/-18. SpeechifyAI has the stronger published economics in the compared plans; Inworld remains the stronger fit for broad multilingual speech or teams already committed to its character runtime.
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