One API.
Every voice provider.
240+ provider combinations. Zero way to know which stack is best. VoiceForge benchmarks every combo and routes to the winner automatically.
Recommended: Deepgram + GPT-4.1 + Cartesia
Latency: 195ms (P95: 280ms) | Naturalness: 4.2/5 UTMOS | Cost: $0.003/call
Universal voice infrastructure.
Connect once. We handle 18+ provider integrations, benchmark every combination, and route to the best one.
Universal Infrastructure
Connect your app once. VoiceForge acts as a unified abstraction over every major STT, LLM, and TTS provider.
Smart Routing
Tell us your use case, language, and priority. We benchmark every combination and return the best stack.
Automatic Failover
If Deepgram goes down, VoiceForge instantly routes to the next-best ranked combination. Zero downtime.
Quality Testing & Benchmarking
Automated latency benchmarks (P50, P95, P99) alongside UTMOS scoring and native speaker marketplace testing for true naturalness verification.
Provider-agnostic by design. ElevenLabs will never recommend Cartesia for Thai. We will.
How It Works
Three steps to the perfect stack.
Define
Set your language, use case, latency targets, and budget. Takes 30 seconds.
Benchmark
VoiceForge runs 50+ STT+LLM+TTS combinations against your criteria automatically.
Deploy
Get ranked results with data. Apply the winning config with one click.
Providers can't build this.
Neutrality is the moat. Vapi benchmarks within their stack. ElevenLabs recommends ElevenLabs. We recommend whoever's best.
Every major provider.
18+ voice AI providers across the full pipeline. New providers added monthly.
240+ possible combinations
Frequently asked questions
We run your actual prompts through every STT + LLM + TTS combination you select. Each combo is measured on latency (P50, P95, P99), audio quality (UTMOS score), language accuracy, and cost per call. Results are ranked by the priority weights you set, so you get the best stack for your specific use case.