Inworld AI vs Convai vs NVIDIA ACE vs Cartesia
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Inworld AI
Real-time voice AI stack — TTS, STT, and an LLM router
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Convai
Voice-first AI NPC SDKs for Unity and Unreal, from ex-NVIDIA devs
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NVIDIA ACE
On-device AI NPCs for games — shipping in PUBG and NARAKA
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Cartesia
Ultra-low-latency voice AI on Mamba SSMs
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| RECATOOLS Score | 7.6 / 10 | 7 / 10 | 7.5 / 10 | 7.6 / 10 |
| Capability | — | — | — | |
| Value for money | — | — | — | |
| Ease of use | — | — | — | |
| ASEAN readiness | — | — | — | |
| API quality | — | — | — | |
| Pricing | Paid | Freemium | Free | Paid |
| Free tier | Agent Runtime orchestration is free; pay only for model/API consumption | Indie Dev tier ~$14/month (10,000 interactions) | Free developer SDK via the NVIDIA developer program | — |
| Paid from | TTS-1.5 Mini $5/million characters; Realtime streaming from $0.10/hr | ~$22/month (higher interaction caps, premium models); Enterprise custom | — | — |
| Has API | ✓ | ✓ | ✓ | ✓ |
| Open source | ✗ | ✗ | ✗ | ✗ |
| Free to use | ✗ | ✓ | ✓ | ✗ |
| Users | — | — | — | — |
| Founded | 2021 | 2022 | 1993 | 2023 |
| Maker | Ilya Gelfenbeyn, Kylan Gibbs, Michael Ermolenko | Purnendu Mukherjee, Prashant Mishra | Jensen Huang, Chris Malachowsky, Curtis Priem | — |
| Verdict | Inworld has moved on from its original AI-NPC framing into real-time voice infrastructure, and the reinvention holds up. Its TTS-2 sits at the top of the Artificial Analysis Speech Arena, latency runs sub-200ms, and a cl... |
Convai is the platform game developers reach for when they want talking NPCs working in-engine fast — several report going from nothing to a pathfinding, conversing character in an afternoon inside Unreal or Unity. The s... |
ACE is the rare "AI NPC" pitch that actually ships in retail games rather than sizzle reels — PUBG, NARAKA: BLADEPOINT, inZOI and others carry it. The technical bet is on-device inference: small language models plus spee... |
Cartesia's Sonic models are a leading choice for real-time text-to-speech, prized for very low latency and natural prosody, making them well-suited to voice agents and interactive applications. The API is developer-frien... |
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Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.