Vapi vs UntitledPen

Comparing the features of Vapi to UntitledPen

Feature
Vapi
UntitledPen

Capability Features

A/B Experiments
AI Guardrails
AI Writing Commands
rewritepolishimprove flowtone
API Access
API Configurability
4.2K+ configuration points
API-First Architecture
Audio Download Quality Free Plan
128 kbps, 44.1 kHz
Audio Download Quality Paid Plans
Up to 192 kbps, 44.1 kHz
Audio Exports
Automated Test Execution
Automatic Scalability
Millions of calls
Bring Your Own Models
Community Support
13000
Custom Phone Number
Customizable Voice Tone
Dedicated Deployment Engineer
Documentation
Enterprise Compliance
SOC2HIPAAPCI
File Upload Support
Inbound Calls
Mini Demo Available
Multi-language Support
100+ languages
Multilingual Support
Natural Voice Generation
No-code/Low-code Workflow
Notion-like Smart Editor
Outbound Calls
Prebuilt Templates
1000s
Smart Transcription
Smart Writing Assistant
Speech to Text
Studio Mode
Text to Speech
Tool Calling
Ultra-low Latency
Sub-500ms
Uptime SLA
99.99% uptime
Voice Editor
Voice Types
AlloyAshBalladCoralEchoFableNovaOnyxSageShimmerVerse

Integration Features

Client SDK
React (web SDK)
Downloadable SDK ZIP
Github Repository
Integrations Information
40+ apps
OpenAI Integration
openaigpt-4o
Server SDKs
TypeScriptPythoncURL

Limitation Features

Audio Quality Limitation Free
128 kbps max
Audio Quality Limitation Paid
192 kbps max
Character Limit
500
Free Plan AI Usage Limit
1000
Free Plan Voice Generation Limit
10000
No Built-in Telephony Provider Mentioned
No Explicit Pricing Details
No Explicit Usage Quotas Listed
No File Format Support Listed

Pricing Features

Creator Plan Monthly Price
$25 per month
Free Plan AI Refine Limit
1000
Free Plan Character Limit
10000
Free Plan Price
$0
Free Tier
No Credit Card Required
Pro Plan Price
$12 per month (billed annually)
Pro/Creator Plan Character Limit
200000
Trial Period
Not specified