AssemblyAI vs Axiom
Best-in-class speech-to-text API — Universal models, 99 languages, low-latency streaming
vs. Observability for logs, traces, events — serverless-first, infinite scale
Pricing tiers
AssemblyAI
Free Credits
$50 in free credits on signup. Full API access.
Free
Pay-as-you-go
Per-hour billing by model. No minimum.
$0 base (usage-based)
Enterprise
Custom contracts. SLA, private deployments, BAA.
Custom
Axiom
Personal (Free)
No credit card. 500 GB/month ingest, 10 GB-hr compute, 25 GB storage, 30-day retention max.
Free
Axiom Cloud
$25/month minimum platform fee. Volume-based ingest + query credits. Always-free allowances: 1 TB/mo ingest, 100 GB-hr queries, 100 GB storage.
$25/mo
RBAC Add-on
+$50/month for role-based access control.
$50/mo
Audit Logs Add-on
+$50/month for audit logs.
$50/mo
Directory Sync Add-on
+$100/month for SCIM.
$100/mo
SSO Add-on
+$100/month for SAML SSO.
$100/mo
Enterprise
Custom. Dedicated cluster option, private connectivity, SLA.
Custom
Free-tier quotas head-to-head
Comparing free-trial on AssemblyAI vs personal on Axiom.
| Metric | AssemblyAI | Axiom |
|---|---|---|
| ingest gb month | — | 500 GB/month |
| query compute gb hr | — | 10 GB-hr/month |
| retention max days | — | 30 days |
| storage gb | — | 25 GB |
Features
AssemblyAI · 11 features
- Advanced Prompting — Streaming with disfluency + code-switching + realtime diarization.
- Audio Intelligence — Sentiment, topic detection, summarization, entity detection, content safety, IAB…
- Auto Punctuation — Smart capitalization + punctuation.
- Keyterm Prompting — Boost accuracy for domain vocabulary.
- LeMUR (LLM framework) — Run LLMs over transcripts: Q&A, summary, action items.
- Medical Mode — Specialized for clinical + medical vocabulary.
- PII Redaction — Auto-redact credit cards, SSNs, addresses, emails.
- Pre-recorded Transcription — Upload audio/video URL or file → transcript.
- Realtime Streaming — WebSocket-based low-latency STT.
- Speaker Diarization — Identify who spoke when.
- Webhooks — Auto-notify when transcription finishes.
Axiom · 15 features
- API Tokens — Scoped tokens for ingest or query.
- APL (query language) — Axiom Processing Language — Kusto-inspired pipes (`|`). Fast + expressive.
- AWS Lambda Extension — Native extension to ship Lambda logs + traces.
- Cloudflare Integration — Workers + Pages log drain. Log pull from any Cloudflare zone.
- Dashboards — Visualizations from APL queries: line/bar/pie/heatmap/table.
- Datasets — Logical partitions of data. Schema-free; fields auto-indexed.
- Elastic Bulk API compat — Elasticsearch Bulk API endpoint — drop-in replacement.
- Field Explorer — Auto-detected field stats, histograms, top-values per dataset.
- Monitors (alerts) — Threshold + anomaly-based alerting on APL queries. Route to Slack/PagerDuty/emai…
- next-axiom — Next.js logger with automatic correlation + Web Vitals capture.
- OpenTelemetry-native — Ingest OTLP/HTTP + gRPC. No proprietary agent.
- Saved Queries — Save + share APL queries as starters.
- Stream (live tail) — Live tail of incoming events with filter bar.
- Traces — OpenTelemetry-native. Distributed tracing across services.
- Vercel Integration — One-click: Vercel logs + Web Vitals → Axiom.
Developer interfaces
| Kind | AssemblyAI | Axiom |
|---|---|---|
| CLI | — | Axiom CLI |
| SDK | assemblyai-go, assemblyai (Node), assemblyai (Python), assemblyai (Ruby) | axiom-go, @axiomhq/js, axiom-py, axiom-rs, next-axiom |
| REST | AssemblyAI REST API | Axiom REST API, Ingest HTTP endpoint |
| MCP | — | Axiom MCP |
| OTHER | Streaming WebSocket, Webhooks | — |
Staxly is an independent catalog of developer platforms. Outbound links to AssemblyAI and Axiom are plain references to their official websites. Pricing is verified against vendor pages at publication time — reconfirm before buying.
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