AssemblyAI
AssemblyAI is a developer-first speech-to-text platform built for production voice AI, with industry-leading accuracy from its Universal model family. Beyond transcription it offers a Speech Understanding API (summarization, sentiment, PII redaction), a Voice Agent API, and an LLM Gateway (formerly LeMUR) that runs LLMs over transcripts at passthrough pricing. Pricing is transparent pay-as-you-go -- pre-recorded from $0.15/hr, realtime from $0.15/hr -- with an unusually generous free tier (185 hours pre-recorded, 333 hours streaming, no card). It's a builder's tool, not a consumer app, and competes head-to-head with Deepgram.
Cartesia
Cartesia builds real-time-first voice models -- its Sonic TTS and Ink STT rank #1 on Artificial Analysis speech leaderboards for combined quality and speed. Built on state-space (Mamba-style) architectures for ultra-low latency, it's purpose-made for voice agents and powers platforms like Retell. One developer API covers TTS, STT, and voice agents, with a genuinely usable free tier (20K credits/mo) and paid plans from $5/mo, plus cloud, on-prem, and on-device deployment. The main friction is an abstract credit model and promo pricing that muddies the long-term cost.
AssemblyAI edges Cartesia on aggregate — 88 vs 88.
A best-in-class developer speech-to-text platform with a genuinely generous free tier -- overkill if you want a consumer app, ideal if you're building voice AI. Cartesia still wins for buyers who prioritise true free tier with a commercial upgrade path. Both tools are independently scored — the right pick depends on which dimensions matter most for your workflow.
Side-by-side, every cell sourced.
Pricing pulled from each tool's public site. Scores follow the BigBang Score rubric — pricing transparency, free tier, API support, update frequency, unique factor, documentation, and community.
Use-case picks.
Cut through the spec sheet. Here's what we'd recommend depending on what matters most.
Pick AssemblyAI if…
You prioritise market-leading transcription accuracy (universal models) and unusually generous free tier (185 hrs pre-recorded, no card).
Pick Cartesia if…
You prioritise true free tier with a commercial upgrade path and #1-ranked real-time speech quality and speed.
Editorial pick
AssemblyAI wins our composite score (88/100). It edges ahead on aggregate — but the right tool depends on which dimensions matter most.
Related head-to-heads in AI audio.
AssemblyAI vs ElevenLabs — AI audio
BigBang Scores 88/100 vs 88/100. Pricing, capabilities, and editorial verdict inside.
AssemblyAI vs OpenAI Whisper — AI audio
BigBang Scores 88/100 vs 88/100. Pricing, capabilities, and editorial verdict inside.
AssemblyAI vs Deepgram — AI audio
BigBang Scores 88/100 vs 86/100. Pricing, capabilities, and editorial verdict inside.
AssemblyAI vs Cartesia - frequently asked.
Direct answers tuned for AI search engines (ChatGPT, Perplexity, Claude) and Google's People Also Ask.
The short answer.
AssemblyAI wins on aggregate, but Cartesia pulls ahead on specific axes - the spec sheet above shows where each one earns its keep.