Cartesia AI vs Speechify
Ultra-low latency streaming API vs consumer-focused reading platform: Which fits your developer needs?
Cartesia AI
Voice samples
Natural Conversation
"what is 6 7 anyway?"
Gen Z Slang
"low-key that's such a vibe though"
Educational Content
"the mitochondria is the powerhouse of the cell, and also the only thing i remember from biology"
Speechify
Voice samples
Natural Conversation
"what is 6 7 anyway?"
Gen Z Slang
"low-key that's such a vibe though"
Educational Content
"the mitochondria is the powerhouse of the cell, and also the only thing i remember from biology"
About Cartesia AI
Cartesia focuses on ultra-low-latency voice models for real-time agents. Its Sonic 3 streaming TTS emphasizes fast time-to-first-audio, fine-grained prosody control, and developer-friendly WebSocket/SSE APIs.
Sonic 3 (Streaming TTS)
Latest streaming model with industry-leading latency and controls for volume, speed, and emotion.
WebSocket & SSE APIs
Real-time synthesis via WebSocket/SSE with input-streaming to preserve prosody during incremental generation.
Speech-to-Text
Streaming STT for conversational agents that pair with Sonic in low-latency pipelines.
About Speechify
Speechify is best known as a consumer reading app with mobile/desktop apps and a Chrome/Edge extension. It also offers creator tools in Speechify Studio (voice over, dubbing, cloning) and publishes a developer TTS API with SSML controls and SDKs.
Mobile & Desktop Apps
Read PDFs, docs, and articles with natural-sounding voices across devices.
Browser Extension
Listen to web pages and online content directly in Chrome/Edge with speed, voice, and accessibility controls.
Speechify Studio
Creator suite for browser-based voice over, dubbing, and AI voice cloning.
Text-to-Speech API
Developer API with SSML and SDKs for integrating TTS into custom apps and workflows.
Transparent Pricing Comparison
Compare pricing and value
Provider
Price per Character
Estimate per Minute*
Estimate per Hour*
Speechify
$0.00010
$0.10
$6.13
Cartesia AI
$0.00004
$0.05
$2.93
*this is a best guess estimate
Pricing Summary
Cartesia AI is approximately 60% less expensive than Speechify's developer API with industry-leading sub-90ms latency optimized for real-time applications. Speechify offers consumer apps, browser extensions, and creator tools beyond just API access. Choose Cartesia for cost-effective streaming voice synthesis in developer applications; choose Speechify if you need consumer-ready reading apps and studio tools alongside API access.
Choose Real-Time Performance or Consumer Tools
Compare streaming speed, features, and pricing to find the best fit for your application.