ThinnestAI vs Vapi
Vapi is the default dev voice-AI platform most Indian builders evaluate first. Here's the honest head-to-head on pricing, phone ops, and Indian-language support.
- ThinnestAI is a flat, all-inclusive ₹2/min — Vapi's $0.05/min (≈₹4.2/min) is just their platform fee, with provider costs stacked on top.
- ThinnestAI bills in INR with GST-compliant invoices. Vapi is USD-only Stripe billing — painful for Indian ITC claims.
- ThinnestAI handles Indian phone numbers natively — buy from us, or import a DLT-compliant Plivo number via BYOK. With Vapi, DLT/TRAI compliance is your problem.
Real pricing math, three volume tiers
Vapi's all-in cost is publicly reported at $0.25–$0.33/min once a typical provider stack is layered in. We use a mid-point ≈ $0.25/min (₹21). ThinnestAI is a flat ₹2/min, all-inclusive rate — telephony and the curated model stack are already included. Converted at ₹83/$.
Pricing sourced from public rate cards as of April 2026. Your actual costs depend on prompt length, output tokens, provider choice, and BYOK status. Verify current rates on each vendor's pricing page before committing.
Feature-by-feature comparison
| Feature | ThinnestAI | Vapi |
|---|---|---|
| Per-minute rate | ₹2/min (telephony included) | $0.05/min (~₹4.2/min) |
| Billing currency | INR with GST invoices | USD only (Stripe) |
| Indian phone number procurement | Native — buy from us, or import a Plivo number (BYOK), DLT-compliant | DIY via Twilio/Telnyx |
| Model stack (LLM/STT/TTS) | Curated, production-tuned stack | Full BYOK — bring your own keys |
| No-code flow editor | Yes — drag-and-drop flow editor | Yes — Vapi Workflows |
| Indian language routing | Opinionated Indic routing (Sarvam, Deepgram Nova, ElevenLabs Multilingual) | Pass-through, no opinion |
| Developer community size | Growing, India-focused | Massive global community, many templates |
| Docs & SDKs | REST, Python, JS | REST, Node, Python, Web, huge examples repo |
You are building an English-first global product
- Your users are primarily English-speaking (US, UK, EU, ANZ).
- You want access to the largest template / community library in the voice AI space.
- USD Stripe billing is not a concern for your entity.
- You are happy to wire up DLT / TRAI compliance yourself via Twilio.
You are building for India or going global from India
- You serve Hindi, Marathi, Tamil, Telugu or any Indian-language audience.
- You need INR billing and GST-compliant tax invoices, not USD Stripe charges.
- You want native Indian phone number procurement — buy from us directly, or import an existing Plivo number (DLT-compliant BYOK).
- You want a curated, production-tuned model stack (LLM, STT, TTS) without stitching providers together yourself.
- A flat, all-inclusive ₹2/min rate beats negotiated or unbundled pricing for cost predictability.
Try ThinnestAI free
Start with 25 free voice minutes, no card required. Build your first Indian-language voice agent in under 5 minutes.
Frequently asked questions
How does ThinnestAI compare to Vapi on price?
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Vapi charges $0.05/min as a flat platform fee, plus pass-through for whichever providers you pick — real-world all-in is $0.25–$0.33/min per Bessemer's own portfolio commentary. ThinnestAI is a flat ₹2/min, all-inclusive rate — telephony and the curated model stack are already included — roughly 90% cheaper at the same volume.
Can ThinnestAI do everything Vapi can?
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For Indian-market use cases, yes — same native phone/SIP integration, same no-code flow editor, plus INR billing and DLT-compliant phone number procurement that Vapi does not offer. Vapi still has an edge on raw provider flexibility (bring your own LLM/STT/TTS keys) and a larger template library for global English-first products.
Why does INR billing matter?
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Indian businesses claiming Input Tax Credit (ITC) need GST-compliant tax invoices in INR from the vendor. USD Stripe charges from Vapi do not qualify. ThinnestAI issues GST invoices, which means roughly 18% of your spend comes back as ITC for GST-registered businesses.
Is ThinnestAI as developer-friendly as Vapi?
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ThinnestAI offers REST APIs, Python and JS SDKs, webhooks, and a no-code flow editor. Vapi has a larger community and more templates, but the core dev experience (start an agent, swap providers, deploy) is comparable.
Can I migrate from Vapi to ThinnestAI?
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Yes. Flow logic needs to be rebuilt in the ThinnestAI editor, but prompts, tool definitions and knowledge-base content carry over directly. You won't need to bring your own OpenAI, Deepgram or ElevenLabs accounts — ThinnestAI's curated model stack replaces that provider management for you.