Best OpenAI Realtime API Alternatives for Voice Assistants
28 AI tools that can replace OpenAI Realtime API for talking to a voice assistant, ranked by how closely they match. The percentage is a match score, not a popularity score.
Replacing: OpenAI Realtime API — The OpenAI Realtime API is a developer interface for building voice agents that listen andInput: text, images, audio · Output: text, audio
1
Hume EVI, the Empathic Voice Interface, is a voice AI API for building agents that pick up on how a person sounds as well as what they say.
Input: text, audio · Output: text, audio
Free planFrom $3/moAPITeams
83%Strong alternative
00
How the score adds up
- Built for Voice Assistants (its core category)70/70
- Shares OpenAI Realtime API's other goals6/10
- Feature description similarity6/20
Shared goals 3 of the 4 we tag OpenAI Realtime API for
API IntegrationText to SpeechVoice Assistants
Also tagged for
Voice Cloning
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
2
Alexa+ comes free with your Prime membership
Input: text, audio · Output: text, images, audio
Free plan
74%Partial replacement — covers the main need with gaps
00
How the score adds up
- Built for Voice Assistants (its core category)70/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity2/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Chatbots
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
3
Your Apple TV remote can now control your Mac with AI voice commands
Input: audio · Output: text
From $20/mo
77%Strong alternative
00
How the score adds up
- Built for Voice Assistants (its core category)70/70
- Shares OpenAI Realtime API's other goals4/10
- Feature description similarity2/20
Shared goals 2 of the 4 we tag OpenAI Realtime API for
TranscriptionVoice Assistants
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
4
77%Strong alternative
00
How the score adds up
- Built for Voice Assistants (its core category)70/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity5/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
5
Deepgram is a voice AI platform that exposes speech-to-text, text-to-speech and conversational agents through APIs.
Input: text, audio · Output: text, audio
Free planAPITeams
65%Partial replacement — covers the main need with gaps · same core category as OpenAI Realtime API
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals10/10
- Feature description similarity13/20
Shared goals 4 of the 4 we tag OpenAI Realtime API for
API IntegrationText to SpeechTranscriptionVoice Assistants
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
6
ElevenLabs API is a developer interface to the company's audio models.
Input: text, audio · Output: text, audio
Free planFrom $5/moAPITeams
64%Partial replacement — covers the main need with gaps · same core category as OpenAI Realtime API
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals10/10
- Feature description similarity12/20
Shared goals 4 of the 4 we tag OpenAI Realtime API for
API IntegrationText to SpeechTranscriptionVoice Assistants
Also tagged for
Music GenerationSound EffectsVoice Cloning
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
7
Vapi is a developer platform for building, testing and deploying voice AI agents that talk to customers on the phone.
Input: text, audio · Output: audio, apps
Free planFrom $29/moAPITeams
63%Partial replacement — covers the main need with gaps
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity19/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Call CentersCustomer Support
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
8
Developers building real-time communication features into apps get a complete solution that handles voice, video, chat, and live streaming through APIs and SDKs
Input: text, audio, video · Output: apps
Free planAPI
56%Limited overlap · same core category as OpenAI Realtime API
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals6/10
- Feature description similarity8/20
Shared goals 2 of the 4 we tag OpenAI Realtime API for
API IntegrationVoice Assistants
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
9
NPCs that actually think
Input: text, audio · Output: text, audio
Free planFrom $25/moAPI
55%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals9/10
- Feature description similarity5/20
Shared goals 4 of the 4 we tag OpenAI Realtime API for
API IntegrationText to SpeechTranscriptionVoice Assistants
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
10
Microsoft Azure AI Speech, now branded Azure Speech in Foundry Tools, is a cloud service for adding voice to applications and agents.
Input: text, audio, video · Output: text, audio, video
APITeams
62%Partial replacement — covers the main need with gaps · same core category as OpenAI Realtime API
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals10/10
- Feature description similarity10/20
Shared goals 4 of the 4 we tag OpenAI Realtime API for
API IntegrationText to SpeechTranscriptionVoice Assistants
Also tagged for
Translation
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
11
Pipecat is an open-source Python framework for building voice and multimodal AI agents that talk in real time.
Input: text, audio, video · Output: text, audio
Free plan
59%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity15/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Software DevelopmentAI Agents
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
12
59%Limited overlap · same core category as OpenAI Realtime API
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals6/10
- Feature description similarity12/20
Shared goals 2 of the 4 we tag OpenAI Realtime API for
API IntegrationVoice Assistants
Also tagged for
Call Centers
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
13
Google's most capable AI model
Input: text, images, audio, documents, code · Output: text, images, audio, video, code
Free planFrom $4.99/mo
49%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity5/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
SummarizingWritingImage GenerationImage to ImageVideo GenerationVideo SummariesCodingLanguage ModelsAI AgentsPDF WorkPresentationsSearch
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
14
Vocode is an open-source toolkit for building voice-based AI agents.
Input: text, audio · Output: audio
Free planAPI
56%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity12/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Software DevelopmentCall Centers
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
15
AI across Microsoft
Input: text, images, audio, documents, code · Output: text, images, audio, code
Free plan
48%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity4/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
RewritingSummarizingWritingImage GenerationCodingPDF WorkSearchHomework HelpTranslationResearchChatbots
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
16
Microsoft Copilot is an AI-powered chat assistant utilizing advanced AI technologies, such as OpenAI models GPT-4 and DALLE 3. These technologies enable Copilot to deliver fast, sophisticated, and acc
Input: text, images, audio, documents, code · Output: text, images, audio, code
Free planFrom $9.99/mo
48%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity3/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
RewritingSummarizingWritingImage GenerationCodingPDF WorkSearchHomework HelpTranslationResearchChatbots
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
17
Retell AI is a voice agent platform for automating phone calls.
Input: text, audio · Output: audio, apps
Free trialAPITeams
55%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity11/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Call CentersCustomer Support
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
18
Babelbeez puts AI voice agents directly on websites to handle customer enquiries, support requests, and sales conversations through speech-to-speech interactions
Input: audio, documents, web pages · Output: audio, apps
Free planAPI
51%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity7/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Customer SupportLead Generation
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
19
LiveKit Agents is an open source framework and cloud platform for building voice, video and physical AI agents and running them in production.
Input: text, audio, video · Output: text, audio
Free planFrom $50/moAPITeams
54%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity10/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Software DevelopmentCall CentersAI Agents
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
20
Enterprise sales teams can't manually handle thousands of customer interactions across multiple channels
Input: text, audio, data · Output: text, audio, apps
Free planFrom $3.65/mo
48%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity4/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Customer SupportWorkflow AutomationAI Agents
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
21
ElevenLabs Conversational AI, now branded ElevenAgents, lets teams build, test and deploy voice and chat agents that handle customer conversations.
Input: text, audio, documents · Output: text, audio, apps
Free planFrom $5/moAPITeams
53%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity9/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Call CentersCustomer SupportAI Agents
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
22
The Deepgram Voice Agent API is one real-time API that combines speech recognition, language model orchestration and speech synthesis, so developers do not have to stitch separate services together.
Input: text, audio · Output: text, audio
Free trialAPI
53%Limited overlap · same core category as OpenAI Realtime API
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals6/10
- Feature description similarity5/20
Shared goals 2 of the 4 we tag OpenAI Realtime API for
API IntegrationVoice Assistants
Also tagged for
Call Centers
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
23
Amazon Lex is a managed AWS service for adding conversational interfaces to applications through voice and text.
Input: text, audio · Output: apps
API
50%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity6/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Call CentersCustomer SupportChatbots
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
24
A dental office gets 200 calls a week asking about appointment times, insurance coverage, and procedure pricing
Input: audio · Output: audio
Free trialFrom $149/moTeams
50%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity6/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Call CentersCustomer Support
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
25
Meta AI is Meta's personal AI assistant, built on the company's Llama models.
Input: text, images, audio, code · Output: text, images, audio, code
Free planMobile app
50%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity5/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
WritingImage GenerationImage to ImageVideo GenerationHomework HelpTranslationChatbots
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
26
Martin is a personal AI assistant that manages your calendar, inbox, text messages, phone calls, WhatsApp and Slack.
Input: text, audio · Output: text, audio
Free trialFrom $21/moMobile app
48%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity4/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Personal AssistantEmail WritingScheduling
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
27
An AI agent calls businesses and government offices on your behalf while you go about your day
Input: text · Output: text, audio
Free planFrom $35/mo
47%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity3/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Call CentersPersonal Assistant
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
28
Apple Intelligence is the AI layer built into Apple devices, and its newest generation centers on Siri AI, a conversational assistant that understands personal context.
Input: text, images, audio · Output: text, images, audio
Mobile app
45%Limited overlap
00
How the score adds up
- Offers Voice Assistants as a secondary capability42/70
- Shares OpenAI Realtime API's other goals2/10
- Feature description similarity1/20
Shared goals 1 of the 4 we tag OpenAI Realtime API for
Voice Assistants
Also tagged for
Object RemovalPersonal Assistant
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
Can it really replace OpenAI Realtime API for talking to a voice assistant? Vote on each alternative — no account needed. Votes gently reorder the list; they never change the match score.
Missing an alternative for talking to a voice assistant? Suggest it
At a glance: top OpenAI Realtime API alternatives for Voice Assistants
| Tool | Match | Input | Output | Pricing | Free plan | Rating | Category |
|---|---|---|---|---|---|---|---|
| Hume EVI | 83% | text, audio | text, audio | From $3/mo | Yes | — | AI Voice Assistants |
| Alexa | 74% | text, audio | text, images, audio | Free | Yes | — | AI Voice Assistants |
| GoatRemote | 77% | audio | text | From $20/mo | No | — | AI Voice Assistants |
| Gpt Realtime 2 | 77% | text, audio | text, audio | From $15.92/mo | Yes | — | AI Voice Assistants |
| Deepgram | 65% | text, audio | text, audio | Freemium | Yes | — | AI API |
| ElevenLabs API | 64% | text, audio | text, audio | From $5/mo | Yes | — | AI API |
Frequently asked
What is the best OpenAI Realtime API alternative for talking to a voice assistant?
Hume EVI (83% match) is the closest alternative to OpenAI Realtime API for talking to a voice assistant: Hume EVI, the Empathic Voice Interface, is a voice AI API for building agents that pick up on how a person sounds as well as what they say. Alexa (74% match) and GoatRemote (77% match) come next.
Is there a free alternative to OpenAI Realtime API for talking to a voice assistant?
Yes. 20 of the 28 ranked alternatives have a free plan or free tier, including Hume EVI, Alexa, Gpt Realtime 2.
How is the match percentage calculated?
It measures how much of OpenAI Realtime API's job a tool can take over for talking to a voice assistant: shared core category, how many of the same use cases it covers and how similar its feature set is. Popularity and ratings never change the percentage; they only break ties in the order. Lists are recomputed nightly and reviewed by editors for the most-visited tools.
How this list is ranked
The match score measures how much of OpenAI Realtime API's job each tool can take over when the goal is talking to a voice assistant: shared core category, how many of the same use cases it covers, and how similar its feature set is. Popularity and ratings do not change the score; they only break ties in the order.
Lists are recomputed nightly from the live catalog and reviewed by our editors for the most-visited tools. Sponsored placements are marked and sit outside the ranking.