Methodology

Data sources

Only vendor-published pages: pricing pages first, then product and docs pages. Each listing links to the exact URLs used. Third-party estimates aren't used for prices.

What "verified" means

"Verified YYYY-MM-DD" means a person or bot loaded the vendor's public page on that date and the figures matched what we publish. If a page shows no prices, we write "not public". If we couldn't load or confirm a page, the listing is flagged "pricing unconfirmed".

Check cadence

Target: every 14 days, and immediately after a vendor submits a correction with a public source.

Test calls

We plan to run a standard script on each platform: an FAQ, a booking with a conflict, an interruption, a transfer request and a spam call. We'll measure latency to first word, interruption handling, transfer success and booking success. No test calls have been run yet, so no page makes claims about call quality.

Rankings

• Best lists rank by estimated cost at a stated volume, using published plans, then by free plan or trial. Each page states its criteria.
• Alternatives pages rank same-type vendors by price transparency, then free-tier availability.
• The matchmaker scores use case, build style, budget fit, phone numbers and stated compliance.

Sponsorship disclosure

Vendors can buy Featured or Category Sponsor placements. These are always labelled "Sponsored", use rel="sponsored" links, and never change data, rankings or quiz scores. Email [email protected] to ask about a placement.

Corrections

Vendors and readers can request a correction. Changes must link to a public source. You can also email [email protected].

Exclusions

• Air AI: air.ai served a defense/readiness software site, not a voice-agent product, when checked on 2026-10-16 and 2026-10-17; current offering could not be verified.

Price changelog