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Hard facts side by side: free tiers, prices, limits, SDKs and privacy. Every value links to the official page it came from and is re-checked every week.

Start from what you need:Chat Voice Vision Image gen Video gen Search Embeddings Agents Tool calling Automation Translation Summaries

For summaries	n8nBuilding block	Exa	AssemblyAI
Free tier	Free trial + free self-host Cloud free trial, no card required; Community Edition is free to self-host. Source, Sep 29, 2026	Yes $10 in credits each month (up to 2,500 Instant searches). Source, Sep 29, 2026	Trial credits $50 in free credits at signup, no credit card required. Source, Sep 29, 2026

Starting price	€20/month Starter, billed annually: 2.5K executions/month, 5 concurrent executions, unlimited workflows. Source, Sep 29, 2026	$4 per 1,000 searches Pay-as-you-go Instant search, up to 10 results per request. Source, Sep 29, 2026	$0.15 per hour Universal-2 pre-recorded speech-to-text (Universal-3.5 Pro: $0.21/hr). Source, Sep 29, 2026

Rate limit	2.5K executions/month Starter cloud plan, with 5 concurrent executions. Source, Sep 29, 2026	10 QPS Default for /search, /answer and /chat/completions; /contents is 100 QPS. Source, Sep 29, 2026	5 concurrent transcriptions Free accounts, async; paid accounts get 200+. Source, Sep 29, 2026

Size limit	Not listed	100 results per query Public max for numResults; higher limits via sales. Source, Sep 29, 2026	5 GB / 10 hours per file Transcript endpoint; direct uploads via /v2/upload capped at 2.2 GB. Source, Sep 29, 2026

Storage	Logs kept 7 days Starter plan max execution log retention; Pro keeps 30 days. Source, Sep 29, 2026	Not listed	Transcripts kept ~30 days Async audio deleted within 24-48 hours; transcript deletion begins at 30 days. Source, Sep 29, 2026

Trains on your data	No AI terms say customer content is not used to train ML models. Source, Sep 29, 2026	Not listed	Opt-out Certain PII-redacted files used for training unless opted out, on a BAA, or using EU servers. Source, Sep 29, 2026