OpenAI Realtime API vs Defapi vs Deepgram Voice Agent API

Which one fits you in 2026? Traffic, pricing, input → output, tasks and community side by side.

Your tool
OpenAI Realtime API
vs
Competitor 1
DDefapi
Competitor 2
Deepgram Voice Agent API
Competitor 3
Suggested competitors for OpenAI Realtime API: ElevenLabs API91% Deepgram90% Microsoft Azure AI Speech86% Hume EVI84% Cartesia83% Inworld AI83% Fixie.ai81% Soniox81%
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3 tools · best value per row highlighted
Your tool OpenAI Realtime API
platform.openai.com
The OpenAI Realtime API is a developer interface for building voice agents that listen and speak in real time.
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Competitor DDefapi
defapi.org
You know how managing multiple AI provider integrations usually means maintaining separate codebases for each vendor
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Competitor Deepgram Voice Agent API
deepgram.com
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.
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Traffic estimated monthly website traffic
Monthly visits
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2.4Kvisits/mo
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MoM change
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▼ 42.6%
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6-month growth
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-86.2%
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Global rank web
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#4,650,820
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Avg. last 3 months
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4.8K
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Bounce rate lower is better
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36%
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Pages / visit
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1.4
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Visit duration
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7s
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Traffic sources
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OpenAI Realtime APIDefapiDeepgram Voice Agent API
04.4K8.8K13.3K17.7KDefapi · 11.1KDefapi · 13KDefapi · 12.4KDefapi · 17.7KDefapi · 9.4KDefapi · 6.2KDefapi · 7.6KDefapi · 4.2KDefapi · 2.4K1K10K100KDefapi · 11.1KDefapi · 13KDefapi · 12.4KDefapi · 17.7KDefapi · 9.4KDefapi · 6.2KDefapi · 7.6KDefapi · 4.2KDefapi · 2.4KDec '25Jan '26FebMarAprMayJunJulAug
Pricing
Model
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Paid
Paid
Starting price
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Free tier
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Free trial
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API access
Plans
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Gemini 3.1 Pro Preview $1/$6/per requestClaude Sonnet 4.6 $1.5/$7.5/per requestClaude Opus 4.6 $2.5/$12.5/per requestSora 2 Stable $0.175+/per request+2 more
Pay As You Go CustomGrowth $4,000/yrEnterprise Custom
Capabilities input → output
Input
AudioImagesText
AudioImagesText
AudioText
Output
AudioText
AudioImagesText
AudioText
Skill level
Advanced
Advanced
Advanced
Categories
Development & CodeVoice & SpeechAI APIAI Text-to-Speech+2 more
Development & CodeAI API
Business & MarketingDevelopment & CodeVoice & SpeechAI API+2 more
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
9
4
11
APIs
Voice agents
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Voice assistance
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Text to speech
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Transcription
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Voice
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Developer tools
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Agent creation
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API integrations
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API management
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Call center automation
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API security
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Audio translation
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Customer calls
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Speech to speech
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 0
▲ 0
▲ 0
Saves
0
0
0
Reviews
0
0
0
Prompts
0
0
0
Verified listing
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Traffic figures are third-party estimates for the tool's own domain; tools sharing a domain with a bigger product are not counted. Pricing is captured from each tool's site and may lag.