Meta Tech ProviderCompared · Spain
Voice AI platforms compared, for businesses in Spain
For a business in Spain the choice comes down to five checks: whether you can keep your +34 number, whether the agent speaks Spanish and the regional languages, how outbound calls sit with the Lista Robinson and the AEPD, what you tell callers about recording, and whether WhatsApp is part of the same agent. This page puts ThinnestAI beside three developer platforms on those checks, with the sources and the date we read them.
What to check
Five things to check before you choose, in Spain.
Put the last column to every supplier you are weighing, ThinnestAI included.
| Check | Why it matters in Spain | ThinnestAI | Ask any supplier |
|---|---|---|---|
| A number you can keep | A clinic in Madrid or a hotel in Palma has usually printed its +34 number on the door, the website and every booking listing, so a new number means starting those over. | Connect the number from your own Twilio, Telnyx or Plivo account, or forward calls to one. We don't sell Spanish numbers. On Telnyx, outbound calls go only to the countries switched on in your voice profile, so add Spain before you call out. | Can the agent answer the +34 number my customers already ring, and does outbound calling to Spain need anything switched on? |
| Spanish and the regional languages | In Catalonia, the Basque Country and Galicia many callers prefer Catalan, Basque or Galician, and holidaymakers and foreign residents ring in English, Dutch, German or French. | Voice agents speak Spanish, Catalan, Basque, Galician and English, among the 50 voice languages. Chat and WhatsApp replies cover Spanish and English but not Catalan, Basque or Galician. We have not published how each voice sounds in each region, so have a native speaker ring the agent first. | Which of Spanish, Catalan, Basque and Galician do you speak on the phone, and which only in chat? |
| Outbound calling rules | The right not to receive unwanted commercial calls is in article 66.1.b of Ley 11/2022. The AEPD's Circular 1/2023 says such calls rest on consent or a legitimate interest you have weighed, and that the exclusion lists, such as the Lista Robinson, must be consulted first (read 25 October 2026). | You set calling hours per campaign on the called person's clock and keep your own do-not-contact list. The agent does not check the Lista Robinson and holds no consent record. We could not verify how an AI voice agent is classified, so plan on the stricter view. | Who checks the Lista Robinson before a campaign runs, and where is consent recorded? |
| Privacy and recording | The GDPR and the Spanish data-protection law apply, with the AEPD as the supervisory authority, and a call you record is personal data you must tell the caller about. | Recording is a per-agent switch that stays off until you turn it on, and the opening line is yours to write, so it can say the call is recorded. We make no claim that the product meets any local law; ask your own adviser, and read the privacy policy. We support region deployments for enterprise customers. | Is recording off by default, and what do you give me in writing about how call data is processed? |
| WhatsApp and billing | Many customers in Spain deal with a clinic, salon or repair shop on WhatsApp, and article 21 of Ley 34/2002 bars advertising by electronic means unless the person asked for it, with a narrow exception for your own customers. | One agent answers the phone, WhatsApp and website chat, with a shared inbox where your team can take over. Marketing messages need opt-in and are for your adviser to judge. Billing is in US dollars by card; there is no euro billing. | Does WhatsApp share one agent and one history with the phone, and in which currency am I billed? |
Side by side
ThinnestAI and three developer platforms, for Spain.
Cells about other companies come from their own documentation, read on 25 October 2026.
| ThinnestAI | Vapi | Retell AI | Bland AI | |
|---|---|---|---|---|
| What it is | A managed agent with a shared inbox, campaigns and a call log | A developer platform that connects speech, language-model, voice and telephony providers | A developer-first voice agent platform | Voice agents with Pathways branching flows |
| Channels | Phone, WhatsApp, website chat, Telegram: one agent, one memory | Voice-focused | Voice and chat | Voice and SMS |
| Price shape | Flat per-minute rate — see pricing | A platform fee per minute plus the providers you choose | Priced per component | Bundled per connected minute |
| Phone numbers in Spain | Bring a number you own on Twilio, Telnyx or Plivo; we don't sell Spanish numbers | Free numbers use US area codes; outbound calls and other countries use a number imported from a carrier such as Twilio or Telnyx | Sells numbers in the US and Canada only; other countries use your own provider | Sells numbers in the US and Canada; for other countries its documentation says to contact support |
| Languages for Spain | Voice in Spanish, Catalan, Basque, Galician and English (American, British and others); chat replies in 37 languages, Spanish and English among them, Catalan, Basque and Galician not | Depends on the speech and voice providers you choose | Depends on the voice and speech providers; the dashboard greys out unsupported choices | Its site states 40+ languages; check yours on a test call |
| Agent setup | Tabbed settings, no flow canvas | Visual Workflows builder | Conversation Flow builder | Pathways branching flows |
| Shared inbox and human takeover | Yes | No | Not checked | Not checked |
| Billing | US dollars, by card | US dollars | US dollars | US dollars |
Read on 25 October 2026 from each company's own pages: Vapi (phone calling, multilingual); Retell AI (purchase a number, language); Bland AI (purchase a number, site). Products change; check each page before you decide. Prices are not compared here: ours are on the pricing page, and theirs are on theirs.
Other options
Other kinds of supplier in Spain.
Kinds of supplier, not companies. Each is the right call for someone.
A staffed answering service
People answer in Spanish or in the local language, can judge a worried caller and pass urgent ones on. It is the better call when every caller needs a person from the first word. It cannot take a hundred calls at once, and a night shift costs more to staff.
A local telephony or cloud-PBX supplier
A Spanish phone supplier can give you the number, the menu and the call forwarding in one contract, and may answer to a local support desk. It routes calls where you send them; it does not understand a question or book a table.
Building on a developer platform
With engineers on staff you can assemble the agent from separate speech, language-model, voice and telephony providers. It gives you control over every part, and it means you also run the testing, the inbox and each provider bill.
Plainly
Who should pick what.
ThinnestAI fits when
- You take calls from guests, residents and buyers who speak English, Dutch or German as well as Spanish, and want one agent for them at any hour.
- You work in Catalan, Basque or Galician on the phone and want a voice that speaks it, tested by a native speaker before any customer hears it.
- You want WhatsApp and the phone handled by one agent, with a shared inbox where your staff can take over.
Something else fits better when
- Every caller needs a person from the first word, or you are in a sector Ley 10/2025 covers, which bars automated answering as the only way to reach customer service. Keep a staffed line and take advice.
- Your customers write in Catalan, Basque or Galician on WhatsApp. Our chat replies do not cover those three, so a staffed inbox serves them better.
- A Spanish public body or large buyer asks for a security certificate we do not claim, or your engineers want to build their own flows. We claim no certification and have no flow builder.
Questions
Common questions.
Can I keep my Spanish +34 number?
+
Do the other platforms sell Spanish numbers?
+
Does the agent check the Lista Robinson?
+
Can the agent answer in Catalan, Basque or Galician?
+
Test it on your own calls in Spain.
Create an agent, give it your own information, and ring it from your browser before you connect a number. Then put the same test to the others.