OpenAI Whisper API vs Universal-3 Pro by AssemblyAI vs Speechmatics | AI Voice Agents vs Soniox

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

Your tool
OpenAI Whisper API
vs
Competitor 1
Universal-3 Pro by AssemblyAI
Competitor 2
Speechmatics | AI Voice Agents
Competitor 3
Soniox
Compare
4 tools · best value per row highlighted
Your tool OpenAI Whisper API
platform.openai.com
OpenAI Whisper API is the speech-to-text service developers call to convert recorded audio into text.
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Competitor Universal-3 Pro by AssemblyAI
assemblyai.com
Speech-to-text API built for accuracy at scale
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Competitor Speechmatics | AI Voice Agents
speechmatics.com
Sub-second speech-to-text across 55+ languages with AI voice agents
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Competitor Soniox
soniox.com
Soniox is a speech AI platform that offers real-time speech-to-text, text-to-speech and speech translation through one API.
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Traffic estimated monthly website traffic
Monthly visits
—
457.8Kvisits/mo
276.5Kvisits/mo
—
MoM change
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▼ 12.0%
▼ 8.9%
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6-month growth
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-16.3%
+26.7%
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Global rank web
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#87,404
#155,675
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Avg. last 3 months
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518.4K
278.4K
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Bounce rate lower is better
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37%
43%
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Pages / visit
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4.0
3.2
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Visit duration
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3m 12s
1m 55s
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Traffic sources
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● Direct 91% · ● Referral 8%
● Direct 87% · ● Referral 12%
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OpenAI Whisper APIUniversal-3 Pro by AssemblyAISpeechmatics | AI Voice AgentsSoniox
0157.2K314.4K471.5K628.7KUniversal-3 Pro by AssemblyAI · 568.9KUniversal-3 Pro by AssemblyAI · 565KUniversal-3 Pro by AssemblyAI · 595.5KUniversal-3 Pro by AssemblyAI · 506.7KUniversal-3 Pro by AssemblyAI · 547.2KUniversal-3 Pro by AssemblyAI · 590.1KUniversal-3 Pro by AssemblyAI · 628.7KUniversal-3 Pro by AssemblyAI · 577KUniversal-3 Pro by AssemblyAI · 520.4KUniversal-3 Pro by AssemblyAI · 457.8KSpeechmatics | AI Voice Agents · 170.8KSpeechmatics | AI Voice Agents · 190.6KSpeechmatics | AI Voice Agents · 185.2KSpeechmatics | AI Voice Agents · 218.3KSpeechmatics | AI Voice Agents · 202KSpeechmatics | AI Voice Agents · 206.5KSpeechmatics | AI Voice Agents · 255.1KSpeechmatics | AI Voice Agents · 303.5KSpeechmatics | AI Voice Agents · 276.5K100K1MUniversal-3 Pro by AssemblyAI · 568.9KUniversal-3 Pro by AssemblyAI · 565KUniversal-3 Pro by AssemblyAI · 595.5KUniversal-3 Pro by AssemblyAI · 506.7KUniversal-3 Pro by AssemblyAI · 547.2KUniversal-3 Pro by AssemblyAI · 590.1KUniversal-3 Pro by AssemblyAI · 628.7KUniversal-3 Pro by AssemblyAI · 577KUniversal-3 Pro by AssemblyAI · 520.4KUniversal-3 Pro by AssemblyAI · 457.8KSpeechmatics | AI Voice Agents · 170.8KSpeechmatics | AI Voice Agents · 190.6KSpeechmatics | AI Voice Agents · 185.2KSpeechmatics | AI Voice Agents · 218.3KSpeechmatics | AI Voice Agents · 202KSpeechmatics | AI Voice Agents · 206.5KSpeechmatics | AI Voice Agents · 255.1KSpeechmatics | AI Voice Agents · 303.5KSpeechmatics | AI Voice Agents · 276.5KNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
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Freemium
Freemium
Paid
Starting price
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Free tier
Free tier
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Free tier
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Free trial
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–
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API access
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Plans
gpt-transcribe Customgpt-4o-transcribe Customgpt-4o-mini-transcribe Customgpt-realtime-whisper Custom
Free Trial FreePay-as-you-go Universal-2 $0.15/moPay-as-you-go Universal-3.5 Pro $0.21/mo
Free FreePro $0.13
Speech-to-Text async $0.10Speech-to-Text real-time $0.12Text-to-Speech $0.70
Capabilities input → output
Input
Audio
Audio
Audio
AudioText
Output
Text
Text
Text
AudioText
Skill level
Advanced
Advanced
Advanced
Advanced
Categories
Development & CodeVoice & SpeechAI APIAI Transcription
Development & CodeVoice & SpeechAI APIAI Transcription
Development & CodeVoice & SpeechAI APIAI Transcription
Education & LearningVoice & SpeechAI Text-to-SpeechAI Transcription+1 more
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
4
3
3
3
Transcription
APIs
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Podcast transcription
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Text to speech
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Voice agents
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–
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Translations
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–
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Call transcriptions
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 0
▲ 0
▲ 0
▲ 0
Saves
0
0
0
0
Reviews
0
0
0
0
Prompts
0
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.