Evidence before opinion
Research methodology
Voice Agents Guide is a structured buyer's guide, not a hands-on review site or performance ranking.
Scope
We include software with a material AI voice, phone, answering, contact-center, developer-runtime, or evaluation capability. Adjacent general-purpose AI products are excluded unless voice is a defined use case.
Sources
Profiles use provider product, pricing, documentation, legal, and authoritative ecosystem pages. Each profile exposes the URLs consulted and the date checked.
Normalization
Provider language is mapped into editorial categories and buyer paths. A shared category indicates a useful comparison path, not identical functionality.
Pricing
Public pricing is shown where available; annual-only discounts are excluded. Usage rates keep their original units, and required subscriptions, add-ons, and commitments are stated separately. For quote-only products, budget implications are clearly marked as inference rather than a published minimum.
Ordering
The default directory follows a documented editorial order. Alphabetical sorting removes that placement. Ordering is not a score or performance ranking.
What we do not claim
We do not publish user ratings, test answer accuracy, calculate scores, claim hands-on use, or name an overall best provider.