Usage-Based vs Tiered: What It Actually Costs at Different Call Volumes
Smith.ai's AI Receptionist starts free for 25 calls/month, then charges $3/call — a solo business that gets 40 calls a month (roughly 120 minutes of AI-handled conversation) pays around $45 on that overage alone. AItocha's usage-based model charges $3/month for the number, then only for the minutes the AI is actually on a call, with no monthly minimum — at that same volume, it lands among the cheapest AI phone options on the market. The gap narrows at higher volume: Smith.ai's Pro tier ($150/mo) includes up to 300 calls, and Enterprise ($500/mo) scales further, so a business doing hundreds of calls a month may find a flat tier cheaper in raw dollar terms. The tradeoff isn't just cost, though — a flat tier is more predictable even when it's not cheaper, which matters to a buyer who wants to know their bill in advance rather than track a per-minute meter.