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AI Agent Tools With a Free Tier

42 of the 64 tools in our index offer a genuine, ongoing free tier — not a time-limited trial or a one-off credit grant — so you can build or test before paying. Developer tools lead by a wide margin; not one of our 7 support-agent listings has one.

We checked every listing in our index against its own transcribed, dated pricing tiers and found 42 of 64 offer a genuine, ongoing way to use the product at zero cost — not a time-limited trial, not a one-off credit grant, but a tier you can stay on indefinitely. The split is not even across categories: coding agents (17 of 19), agent frameworks (11 of 11, unanimous — the newest arrival, Claude Agent SDK, keeps the category perfect) and agent platforms (4 of 10) overwhelmingly let you start free, because these are self-serve, developer-led purchases where the vendor wants a working integration in your hands before you ever talk to sales. Support agents are the mirror image: not one of the site's 7 support-agent listings has an ongoing free plan — every one is sold through a pilot, a per-resolution contract, or a time-limited trial that converts to paid. Voice agents split down the middle (2 of 6): most platforms price per minute from the first call, with only trial credits standing in for a free tier.

We deliberately excluded 5 tools whose pricing page uses free-sounding language that doesn't hold up to that bar. Vapi and Retell AI each disclose, in their own pricing copy, trial-credit-only language (Vapi: 'no permanent free tier'; Retell AI: '$10 in free credits, no commitment') — both are usage-priced per minute from the first call once credits run out. Bland AI waives a separate platform fee on its entry tier but still bills per minute from call one. Intercom Fin and PolyAI each offer a real trial — 14 days and 2 months respectively — that converts to a paid, sales-led plan, not an ongoing free option. None of the 5 are wrong to consider — a free trial is still a real way to test a tool — but they answer a different buyer question than 'can I keep using this for free,' so we left them off this list rather than blur the two.

Why this collection

A tool earns a place here only if its own Published, sourced pricing tiers show an ongoing, indefinite way to use it at $0 — self-hosted and free forever, a permanent free-forever plan, or a cloud tier with a real recurring usage allowance and no stated expiry. A time-limited trial (however generous), a one-time credit grant, or a platform-fee waiver that still bills usage from the first action does not qualify, even where a vendor's own marketing calls it "free." Verified against each listing's dated pricingTiers array, not a vendor's marketing headline; 5 candidates were checked and excluded for this exact reason (see intro) — 2 of the 5 (Vapi, Retell AI, Bland AI) also had a stale attributes.freeTier flag corrected on their own listing as part of this same research pass, since the flag directly contradicted their own already-published pricing copy.