Compare AssemblyAI and Comet ML free tiers side by side. Pricing, limits, change history, and risk assessment for developers.

AssemblyAI vs Comet ML

Side-by-side free tier comparison. Catalogue dates here run to 2026-07-31.

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Verdict

Both AssemblyAI and Comet ML offer free tiers. AssemblyAI provides "Free" while Comet ML offers "Free". AssemblyAI has a more stable pricing history (0 recorded changes vs 1).

A verdict here is not a fixed property of the vendor. A one-off pricing event demotes a vendor while its recorded date falls in the last 180 days and then lapses on its own, with nothing about the vendor having changed; a standing condition — a free tier withdrawn, a product retired — does not lapse with time. A badge carrying a date states the record it rests on; a badge with no date rests on no record in force.

AssemblyAI

Riskstable
CategoryAI / ML
TierFree
Verified2026-07-30
Last read2026-09-12
Changes0 recorded
Speech-to-text and audio intelligence API — free: $50 in credits (~185 hours pre-recorded transcription). Up to 5 concurrent streams. Core STT and Audio Intelligence models. Pay-as-you-go at $0.15/hr after

Comet ML

CategoryAI / ML
TierFree
Verified2026-07-31
Last read2026-08-28
Changes1 recorded
ML experiment tracking and LLM evaluation — There are multiple free options: 'Free' (Open Source GitHub), 'Free Cloud' (up to 10 team members, 25k spans per month, 60-day data retention), and a 'Free' plan for academics. The 'Free Cloud' plan includes Agent tracing & analysis, Test Suites & assertions, and Agent Playground.

Pricing Change History

AssemblyAI

No recorded pricing changes for AssemblyAI.

Comet ML

restructured discovered 2026-08-28 · effective date unknown high impact
The free tier is now limited to 25k spans per month with 60-day data retention, and focuses on observability and agent testing. There is also a separate 'Free Cloud' plan with different limits (up to 10 team members, 25k spans, 60-day retention) and a 'Free' open-source option. A free pro plan for academics is mentioned as 'New!'. Source ↗

Watch Both Vendors for Pricing Changes

We do not push notifications. Every change we record is readable the moment it lands, and the JSON answer carries an ETag — send it back as If-None-Match and an unchanged answer costs one 304.

curl https://agentdeals.dev/api/changes?vendor=AssemblyAI curl https://agentdeals.dev/pricing-changes/feed.xml?vendor=AssemblyAI curl https://agentdeals.dev/api/changes?vendor=Comet%20ML curl https://agentdeals.dev/pricing-changes/feed.xml?vendor=Comet%20ML

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