Vapi vs ZenCall vs Synthflow vs Retell AI

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

Your tool
Vapi
vs
Competitor 1
ZenCall
Competitor 2
Synthflow
Competitor 3
Retell AI
Compare
4 tools · best value per row highlighted
Your tool Vapi
vapi.ai
Vapi is a developer platform for building, testing and deploying voice AI agents that talk to customers on the phone.
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Competitor ZenCall
zencall.ai
ZenCall.ai : Your AI-Powered Phone AssistantNever miss a call or a business opportunity again. ZenCall.ai answers and makes calls on your behalf, exactly how you want—flawlessly, every time. Whether
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Competitor Synthflow
synthflow.ai
Synthflow is an enterprise voice AI platform for automating phone calls with AI agents.
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Competitor Retell AI
retellai.com
Retell AI is a voice agent platform for automating phone calls.
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Traffic estimated monthly website traffic
Monthly visits
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1.2Kvisits/mo
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MoM change
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▲ 47.2%
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6-month growth
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+192.7%
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Global rank web
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#14,969,386
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Avg. last 3 months
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1.3K
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Bounce rate lower is better
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36%
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Pages / visit
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1.0
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Visit duration
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Traffic sources
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VapiZenCallSynthflowRetell AI
08281.7K2.5K3.3KZenCall · 2.5KZenCall · 1.1KZenCall · 423ZenCall · 3.3KZenCall · 2KZenCall · 1.8KZenCall · 841ZenCall · 1.2K1001K10KZenCall · 2.5KZenCall · 1.1KZenCall · 423ZenCall · 3.3KZenCall · 2KZenCall · 1.8KZenCall · 841ZenCall · 1.2KDec '25Jan '26FebMarAprMayJunJul
Pricing
Model
Freemium
Free Trial
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Paid
Starting price
$29per month
$23per month
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Free tier
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Free trial
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API access
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Plans
No Success Package FreeCore $29/moPro $999/moPremier Custom
Essentials $23/moStandard $63/moLifetime Deal $149
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Pay as you go CustomEnterprise Custom
Capabilities input → output
Input
AudioText
Audio
AudioText
AudioText
Output
AppsAudio
AudioText
AppsAudio
AppsAudio
Skill level
Advanced
Intermediate
Intermediate
Intermediate
Categories
Business & MarketingVoice & SpeechAI Call CenterAI Customer Service+1 more
Business & MarketingAI Call CenterAI Customer ServiceAI Sales
Business & MarketingAI Call CenterAI Customer Service
Business & MarketingVoice & SpeechAI Call CenterAI Customer Service+1 more
Tasks what each tool can do · 6 shared · core   partial
Tasks covered
11
11
11
10
Call center automation
Call agents
Call answering
Calls
Customer calls
Customer support
Voice agents
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Agent creation
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Agent testing
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Customer support automation
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APIs
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Customer contact
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Developer tools
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Receptionist
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Sales
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Virtual receptionist
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Call analysis
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SMS marketing
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Sales automation
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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.