Vapi vs Unreal Speech

Comparing the features of Vapi to Unreal Speech

Feature
Vapi
Unreal Speech

Capability Features

A/B Experiments
AI Guardrails
API Access
API Configurability
4.2K+ configuration points
API-First Architecture
Asynchronous Requests
Automated Test Execution
Automatic Scalability
Millions of calls
Bring Your Own Models
Community Support
13000
Custom Phone Number
Dashboard Access
Dedicated Deployment Engineer
Documentation
Enterprise Compliance
SOC2HIPAAPCI
Inbound Calls
Max Audio Duration
10 hours
Max Monthly Characters
7000000000
Multi-language Support
100+ languages
No-code/Low-code Workflow
Outbound Calls
Per-sentence Timestamps
Per-word Timestamps
Prebuilt Templates
1000s
Production Ready Infrastructure
Streaming Endpoint
Streaming Latency
0.3s
Supported Audio Codecs
libmp3lamepcm_mulaw
Supported Bitrates
320k256k192k128k96k64k48k32k16k
Supported Language List
US EnglishUK EnglishMandarin ChineseHindiSpanishPortugueseJapaneseFrenchItalian
Supported Voices
48
Synchronous Requests
Text-to-Speech API
/stream/speech/synthesisTasks/streamWithTimestamps
Tool Calling
Ultra-low Latency
Sub-500ms
Uptime SLA
99.99% uptime
99.9%
Usage Commercial Rights
Voice Parameter Control
SpeedPitch
WebSocket Streaming

Integration Features

API Documentation
API Integration
PythonNode.jsReact NativeBash
Client SDK
React (web SDK)
Downloadable SDK ZIP
Github Repository
Integrations Information
40+ apps
OpenAI Integration
openaigpt-4o
Server SDKs
TypeScriptPythoncURL
Sign In Methods
GoogleEmail
Supported Export Formats
MP3PCM µ-law

Limitation Features

Attribution Requirement
Free plan requires attribution
Max Characters /speech
3000
Max Characters /stream
1000
Max Characters /synthesisTasks
500000
No Built-in Telephony Provider Mentioned
No Explicit Pricing Details
No Explicit Usage Quotas Listed
No File Format Support Listed
Voice Cloning

Other Features

Affiliate Program
Comparison to Competitors
AmazonMicrosoftGoogleElevenLabsPlay.ht

Pricing Features

Additional Usage Price
Basic - $16 per 1M charactersPlus - $12 per 1M charactersPro - $10 per 1M charactersEnterprise - $8 per 1M characters
Elite Plan Quota
625000000
Enterprise Plan Price
$4999/month
Free Characters Limit
250000
Free Plan Rollover
Free Tier
Paid Plan Rollover
Subscription Plans
BasicPlusProEnterprise
Trial Period