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Honest comparison, updated 2026

Relay vs Smith.ai:
all the AI, none of the per-call fees.

Smith.ai is the category incumbent (since 2015) and earns its reputation when you need a real human agent in the loop. If you don’t, you’re paying for a layer you won’t use. Relay is fully AI-driven, starts at $19.99/mo with calendar booking and 29 languages included, and uses Google’s Gemini Live native-audio model for natural conversations. Here’s an honest, sourced comparison.

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Two stylized smartphones side by side, the Relay phone glowing teal with a clean audio waveform, a balance scale tilting gently in its favor
The 30-second version

If you don’t need humans, you’re overpaying.

Three numbers that tell the whole story.

Entry price

$19.99 vs $95

Relay’s Solo plan covers 90 minutes (about 60 to 120 short calls) at $19.99. Smith.ai’s cheapest AI-only plan starts at $95/mo for roughly 50 calls.

Languages included

29 vs English-first

Relay mirrors the caller mid-sentence in any of 29 languages with no menu. Smith.ai’s product is English-language by default; bilingual receptionists are on-request.

Calendar booking

Every plan vs paid add-on

Live Google Calendar booking is included on every Relay tier from $19.99. Smith.ai treats integrations as paid extras with per-call fees on some CRMs.

Feature-for-feature, side by side.

Pulled from each company’s public pricing and product pages, 2026. Where Smith.ai genuinely wins, we say so.

Feature Relay Smith.ai
Pricing
Entry monthly price$19.99$95 (AI) / $292.50 (human)
Included calls / minutes90 min (Solo) to 900 min (Business)~50 calls (AI) to 30 calls (human entry)
Overage$0.15/min, opt-in, off by default~$0.50/call (AI) to $9.75–$11/call (human)
Free demo before payingNo
AI & voice
Tech stack disclosedGemini Live native-audio + Twilio“Advanced LLMs” (not disclosed)
Voice architectureBidirectional native-audio (low latency)Stitched STT → LLM → TTS pipeline
Languages29, auto-mirror mid-callEnglish-first, bilingual on request
SHAKEN/STIR spam rejectionNot disclosed
Booking & integrations
Live Google Calendar bookingEvery planPaid integration, per-call fee on some CRMs
Zapier10 templates + custom Zaps
HMAC-signed webhooks + REST APILimited
Multiple businesses on one account (per-line config)Yes, unique to RelayNo
Caller experience
Trusted-caller Assistant Mode (for you, not just callers)Yes, unique to RelayNo
Live AI-initiated transfer to a person
Human-agent fallbackNoYes (paid tiers)
Per-call summary email
Trust signals
Founded2025 (built by Sandy Brook DevWorks, Austin TX)2015 (Los Altos, CA)
G2 / Capterra ratingsToo new for review density4.5★ G2 / 4.7★ Capterra

Pricing pulled from Smith.ai’s public pricing page and our own pricing, May 2026. We’ll keep this in sync as pricing changes.

Four reasons people switch to Relay.

Specific, sourced, no marketing fluff.

Your bill doesn’t balloon on a busy month.

A 200-call month on Smith.ai’s human-backed plan: roughly $2,000 at $9.75 to $11 per call. The same month on Relay’s Business plan ($199.99/mo, 900 included minutes): $199.99 if calls average under 4.5 minutes, with a flat $0.15/min cap if you go over.

Overage on Relay is opt-in. Off by default: calls beyond the cap are politely declined rather than silently billing you.

Spanish, Mandarin, or Vietnamese mid-call. No menu.

Relay starts in your configured language, then mirrors the caller automatically the moment they switch. Twenty-nine languages on every plan, no pre-call detection, no “press 2” routing.

Live test: dial our real estate demo line and switch to Spanish mid-call. The handoff is silent.

Calendar booking on every plan, not a paid add-on.

Relay checks your Google Calendar live and books the slot before the caller hangs up. Caller can opt in to an email confirmation. Included from $19.99, not gated behind upgrades or per-integration fees.

Relay uses a dedicated “Relay Bookings” calendar so it can’t touch your other events. How it works.

Run multiple businesses on one account.

Each Relay phone number is independently configurable: greeting, voice, tone, language, knowledge base, trusted numbers, notification recipients. One Relay account, several brands. No competitor in the category offers this today.

Useful for: agencies running multiple client lines, brokerages with multiple agent lines, hosts running multiple short-term rental brands.

Honesty section

When Smith.ai is the right choice (and Relay isn’t).

Smith.ai earned its decade-long reputation for a reason. There are real cases where their human-backed model beats an AI-only product, including Relay. If any of these describe you, pay them their $292/mo.

Your callers expect a human voice on the first hello.

Premium-segment legal, wealth management, high-end concierge medical. The category bar is set by competitors who staff real receptionists; an AI voice, even a great one, reads as cost-cutting. Smith.ai matches that bar with actual humans.

Your typical call requires judgment AI can’t safely make.

Sensitive legal intake, regulated financial conversations, complex medical triage. AI is improving fast, but for now there are categories where the safest answer is “a human handled this.” If your typical call lives in that category, the human-backed plan is the responsible choice.

You want one vendor to own intake from call to CRM record.

Smith.ai’s deeper play is intake-as-a-service, especially in legal where they have first-party integrations with Clio, MyCase, and PracticePanther, and where the receptionist team will actively follow up on no-shows and pre-qualify before handoff. Relay is a phone product. If you want a managed intake operation, that’s a different shape of product.

If none of these apply to you, you’re probably paying for a human safety net you don’t need.

What you’ll actually pay.

Three realistic small-business scenarios. No fine print.

Solo plumber, 40 calls/month

Average 2 minutes per call.

Relay Solo$19.99
Smith.ai AI Starter$95.00
Smith.ai human Starter$292.50

Relay covers it in the included 90 minutes. Smith.ai’s AI Starter is over the 50-call bucket and charges $0.50/call overage; the human plan is over its 30-call bucket at $9.75/call.

Three-agent realty team, 120 calls/month

Average 2.5 minutes per call.

Relay Team$64.99
Smith.ai AI Basic~$145
Smith.ai human Pro~$675

Relay’s 300 included minutes covers it. Smith.ai numbers include per-call overage in line with their published tiers.

Property manager, 300 calls/month

Average 3 minutes per call.

Relay Business$199.99
Smith.ai AI Pro~$345
Smith.ai human Pro~$2,400

Relay’s 900 included minutes covers it. The human plan’s $11/call at this volume is where the spread really opens up.

Smith.ai numbers estimated using publicly listed tiers and per-call overage as of May 2026. Confirm against their pricing page before deciding.

Common questions

Is Relay a good Smith.ai alternative?

Yes, if you want fully AI-driven at a much lower entry price. Relay starts at $19.99/mo (Smith.ai’s cheapest AI plan is $95), includes calendar booking and 29 languages, and never adds per-call fees on top. Smith.ai’s edge is human escalation; if you don’t need that, Relay is the right shape of product at one-fifth the price.

How does Smith.ai pricing actually work?

Two product lines. AI Receptionist starts at $95/mo with about $0.50/call overage. Human Virtual Receptionist starts at $292.50/mo for ~30 calls with $9.75 to $11/call overage depending on tier. Some CRM integrations add another $0.50/call. The headline price isn’t usually what you pay if you have a normal call volume.

Does Relay support multiple languages like Smith.ai?

Yes, and the gap is significant. Relay handles 29 languages and switches mid-call to mirror the caller automatically: no menu, no pre-call setting, every plan. Smith.ai’s primary product is English-language; bilingual receptionists are scoped to specific plans on request rather than included by default.

Does Relay book appointments on my calendar like Smith.ai?

Yes. Relay’s Google Calendar booking is included on every paid plan: the AI checks live availability during the call and creates the event before the caller hangs up. Smith.ai supports calendar booking too, but treats integrations as paid add-ons with per-call fees on some CRMs.

When should I pick Smith.ai over Relay?

When you need a real human in the loop. Premium-segment legal, complex intake, regulated conversations, or anywhere your callers expect a human voice on the first hello. Relay is honest about being AI-only and doesn’t try to compete on that dimension.

How do I move from Smith.ai to Relay?

Sign up, get a Relay phone number, and forward your existing line to it. Customers keep dialing the same number they always have; Relay answers behind the forward. Most users run both in parallel for a week to verify Relay handles their typical calls, then keep the forward in place. Start with a free demo.

Hear it before you switch.

Sign up free, Relay phones you back within seconds for a ten-minute live demo configured for your business. No card, no contract, no per-call fees.

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