Decibyl vs Vapi — an honest comparison for Indian teams
We name what they do better. A comparison page that admits a weakness is believed; one that doesn’t, isn’t — and you can fact-check either of us in thirty seconds.
Vapi is best for
Vapi is a mature, developer-first voice platform with a large ecosystem, good documentation, and instant self-serve signup. If you are building in the US or Europe, want to pick your own STT/LLM/TTS stack, and your callers speak English, Vapi is a strong and well-supported default — and it will keep getting better faster than a smaller platform can.
Decibyl is best for
Decibyl is built India-first. Indian languages with code-mixed speech as the normal case, Indian telephony, INR billing with a GST invoice, and data resident in Mumbai by default — with US and EU infrastructure available for teams serving customers outside India too. If your callers speak Hindi or Tamil and your finance team needs a GST invoice, that combination is the whole reason we exist; it just doesn't stop there.
Side by side
Where each of us actually stands today.
| Feature | Vapi | Decibyl |
|---|---|---|
| Published rate | $0.05/min platform fee published; realistic all-in cost runs $0.15–$0.31/min once model and telephony are added, plus $10/line/month past 10 concurrent calls and $1,000/month for HIPAA — read on their own pricing page, Aug 2026 | See /pricing — published, not blended |
| Indian languages | Strong English; Indian language support via third-party providers | 10+ live (7 Indian, code-mixed by default, plus French, Spanish, Arabic) — and any language your stack supports |
| Indian phone numbers (DIDs) | Via Twilio/Vonage — Indian DIDs need your own KYC and arrangement | Indian DIDs, Indian SIP trunking included |
| INR billing + GST invoice | USD, no GST invoice | INR-first, GST-compliant invoice via Razorpay |
| Data residency | US/EU regions | India, US, or EU — Mumbai (ap-south-1) by default |
| MCP-native agent building | No | Yes — build agents from Claude Code |
| Cost transparency | Platform fee plus provider costs | Every component itemised on each call receipt, not blended into one rate |
| Managed onboarding | Self-serve, instant | Managed setup, typically half a day |
Where Vapi is stronger
Larger ecosystem and more mature docs
More integrations, more community examples, more people who have hit your bug before. That is real and worth money.
Instant self-serve onboarding
Sign up and ship in an afternoon without talking to anyone. Our managed tiers involve a setup conversation.
Breadth of model and vendor choice
A wider menu of providers and configurations for teams who want to tune every layer themselves.
Track record at scale outside India
More production deployments and more operating history than we have.
Where Decibyl is stronger
Indic-native stack
Sarvam STT/TTS — roughly 7× cheaper than US alternatives and better on Indian languages. Code-mixed Hinglish and Tanglish are the default register, not an edge case.
Indian telephony
Indian SIP trunking, roughly 5× cheaper than Twilio-class providers, with Indian DIDs included in the managed tiers.
Full ownership of the stack
No third-party orchestration layer sitting in the middle, so there is no orchestration fee to pass on to you.
Indian billing and data residency
INR pricing, GST-compliant invoicing, and call data in AWS Mumbai (ap-south-1) — which is what actually gets a DPDP-conscious buyer to sign.
Verdict
Want the biggest ecosystem and don't need Indian telephony or GST billing? Use Vapi. Calling Indian customers in Indian languages, paying in INR, and answering to an Indian finance and compliance process — with the option to run on US or EU infrastructure when you also serve customers there? That is what we built.
If you’re here for a specific job
The fastest way to compare is to hear both.
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