AI · alternatives · 2026
24 alternatives to Production duplex speech model for revenue calls
Hi, HN, we’re building Mia & Leo: AI personalities backed by purpose-built duplex speech models for revenue calls. Teams building real-world agents told us that more than 40% of callers hang up within the first 30 seconds. On a revenue call, that meant a lost booking, an unpaid balance, a cold lead, or a customer who does not come back. This happens because humans interrupt, correct dates, pause halfway through a sentence, or speak over someone in the background. The agent misses it, talks over them, or loses the thread. That’s because of how the current voice systems work. They sequentially…
Mia & Leo are AI voice personalities designed for revenue calls that can listen and speak simultaneously, handling interruptions, corrections, and overlapping speech without losing conversational flow. Built on… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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Google Duplex▲1,447An AI assisstant that can talk on the phone 🤖
2018 · research.google · its alternatives →
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Human-like AI that automates business calls at scale
Oct 2025 · peakflo.co · its alternatives →
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Hey there, I’m Brian. I've been shipping conversational models over here at Tavus for the past two years. I want to tell you about our new audio-understanding model: Sparrow-2! It’s a new category of model and a unique new approach to conversational audio. Earlier this year we launched Sparrow-1, (at the time) our SoTA turn taking model. Since our Sparrow-1 launch, I’ve spent a lot of time listening to humans talking and trying to really understand how people know when to talk, when to listen, and when to wait. I’ve also been hunting down failure modes of the current SoTA models. And while…
2024 · tavus.io · its alternatives →
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I built a voice agent from scratch that averages ~400ms end-to-end latency (phone stop → first syllable). That’s with full STT → LLM → TTS in the loop, clean barge-ins, and no precomputed responses. What moved the needle: Voice is a turn-taking problem, not a transcription problem. VAD alone fails; you need semantic end-of-turn detection. The system reduces to one loop: speaking vs listening. The two transitions - cancel instantly on barge-in, respond instantly on end-of-turn - define the experience. STT → LLM → TTS must stream. Sequential pipelines are dead on arrival for natural…
Mar 2026 · ntik.me · its alternatives →
- 6CU
We're living in this weird asymmetry where companies use AI to talk to us, but we're still manually dialing them. Companies everywhere are adopting AI voice agents lately. Big retail, family dentist clinics, local pharmacy. This year, I've been in a few calls where it's super natural sounding AI, which has been pretty cool to experience. But then it got me thinking - why are we, the consumers, still the ones making calls if they're using robots for theirs? So I built Piper: basically AI that makes phone calls for you. You tell it what you need (book appointment, check on an order, dispute…
2025 · pipervoice.com · its alternatives →
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VoiceOps▲401the #1 AI platform for analyzing enterprise voice
2017 · voiceops.com · its alternatives →
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Research teams trust. Conversations customers love.
2025 · getperspective.ai · its alternatives →
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Wavel AI▲289Most realistic and natural AI voiceover & dubbing for videos
2023 · wavel.ai · its alternatives →
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Highly expressive and natural speech generation model
2025 · microsoft.ai · its alternatives →
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Leaping AI▲221AI agents that call and text in multi-day campaigns
Jul 2026 · leapingai.com · its alternatives →
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Ojin▲106Talk to an AI Agent with a real face and voice, in real time
Aug 2026 · ojin.ai · its alternatives →
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Dialora.ai▲9224/7 conversational AI voice agents to handle customer calls
2025 · dialora.ai · its alternatives →
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Dasha AI empowers developers to create ultra-realistic voice and text AI agents for telephony, WebRTC, and text channels with sub-second latency.
2018 · dasha.ai · its alternatives →
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- 19RT
Hi HN -- voice chat with AI is very popular these days, especially with YC startups (https://twitter.com/k7agar/status/1769078697661804795). The current approaches all do a cascaded approach, with audio -> transcription -> language model -> text synthesis. This approach is easy to get started with, but requires lots of complexity and has a few glaring limitations. Most notably, transcription is slow, is lossy and any error propagates to the rest of the system, cannot capture emotional affect, is often not robust to code-switching/accents, and more. Instead, what…
2024 · demo.tincans.ai · its alternatives →
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The first multi-turn voice AI model built for conversation
2024 · its alternatives →
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the full stack for those curious: brain (gpt-4o + trained on some notes) || orchestration (vapi)|| voice (elevenlabs)|| hosting (vercel), database (supabase)|| some design inspo from delphi || vibe coding via WisprFlow + cursor/composer ||
2025 · parthai.vercel.app · its alternatives →
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0 Holdings is a permanent capital vehicle. We acquire and transform capacity-constrained service businesses with proprietary AI.
2023 · banterai.app · its alternatives →
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We gave the agents a voice. Sorry in advance.
Aug 2026 · fellowgeek.github.io · its alternatives →
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Dehurdle▲17Practice high-stakes sales, support, and leadership conversations with real-time AI. Get instant speaking pace feedback and 210-competency scoring with zero voice storage.
Aug 2026 · dehurdle.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →