Describe the accent, gender, age and delivery in one sentence and Gradium returns a Castilian Spanish voice id you call from the API or the SDK. This page also covers Andalusian, Canarian, which the rewriter maps separately. The library already carries 24 Castilian Spanish voices, and Voice Design covers whatever it does not.
Castellano, Peninsular Spanish, Spain Spanish, European Spanish and castilian spanish all describe the same voice. Write it as Castilian Spanish in your prompt.
Hear it
“Escúchame una cosa, no te lo puedo creer, fue una locura total.”
A Castilian Spanish female voice, 70 to 80: mid pitch, steady natural pacing, medium energy and an easy unforced resonance. Accent detail: distincion with a theta for c and z, apical s, velar j. Ideal for natural dialogue and voice agents.
A worked example: change any part of it and the voice changes with it. The four styles below show what moving pitch, pace, energy or purpose does to the same accent.
Age is the part of a voice a fixed library cannot vary. Written into the prompt, it comes back in the voice.
Una voz de mujer castellana de 40 años, neutra, precisa y con buena dicción, distinción y ese apical.
The prompt that produced the clip above.
A prompt is built from parts: the accent, the age, then pitch, pace, energy and what the voice is for. Change one part and you get a variation. These four are starting points to adapt, not finished prompts.
Everything to the middle. Watch Distincion: it is the feature a mid-range read is most likely to soften, and the one a listener places Castilian Spanish by.
A Castilian Spanish female voice, 30 to 45: easy and unforced, with mid pitch, steady natural pacing, medium energy and a natural unforced resonance. Ideal for voice agents, assistants and dialogue that has to sound unscripted.
In colour: the 9 parts that make this style.
Pitch, pace and energy drop together. Moving one alone produces a voice performing gravity rather than carrying it, and in Castilian Spanish it usually costs distincion.
A Castilian Spanish female voice, 45 to 60: clean, deliberate and precise, with low pitch, slow pacing, low energy and deep resonant timbre. Ideal for audiobooks, documentary and long-form narration.
In colour: the 9 parts that make this style.
Warmth belongs in the resonance rather than the energy. Keep an ear on Apical S, which a support brief tends to flatten.
A Castilian Spanish female voice, 35 to 50, for customer service: calm and crisp, with mid-low pitch, steady natural pacing, medium energy and warm rounded resonance. Ideal for reassuring walkthroughs and empathic de-escalation.
In colour: the 10 parts that make this style.
Check this by ear before committing. How much energy an accent carries before it reads as theatrical varies sharply, and Castilian Spanish is no exception: push it and listen for whether distincion survives.
A Castilian Spanish female voice, 25 to 35: bright and punchy, with mid-high pitch, fast pacing, high energy and bright forward resonance. Ideal for advertising reads and social video.
In colour: the 9 parts that make this style.
Each feature below is something the prompt has to encode, or something a careless prompt will accidentally undo.
2 regional variants of Castilian Spanish
Each is mapped separately, so naming it in the prompt is what gets it. They are covered here rather than on their own pages because the prompt craft is shared and only the phonetics differ.
Write it as Andalusian Spanish
Write it as Canarian Spanish
Ready to call with no design step. Hear a few here, then open any in the studio or write a prompt of your own.
Young Adult · Female
A sweet, expressive young Castilian Spanish voice, soft and girly with lively emphasis, sparky and to the point for efficient support.
u2UscyAnHilpiwmfYoung Adult · Female
A warm and versatile Spanish young adult voice ideal for everything from ads to professional service.
ynR4CAbXMiOv-vGCYoung Adult · Female
An enthusiastic, bubbly young Castilian Spanish voice, animated like a beauty guru mid-tutorial, adding fun energy to customer care.
c9wqBDmQiBie5q6YAnother 20 Castilian Spanish voices are in the catalogue. Sign in to hear them all, or design one to your own spec from a prompt.
The method behind the prompt: what each clause does, what breaks it, and what it was tested on.
Each row is one part of the prompt above and what it is set to here. Change a single row and you get a variation on this voice; change several and you get a different one.
| Clause | This prompt |
|---|---|
| Accent / localechanged | Castilian Spanish |
| Gender | female |
| Age range | 20 to 30 |
| Character | glossy and confident |
| Pitch | high pitch |
| Pace | fast pacing |
| Energy | high energy |
| Resonance / timbre | bright sparkling resonance |
| Modifiers | girly chatter |
| Applications | a friendly receptionist or assistant |
2 failure modes we hit repeatedly, and what fixes each one.
Descriptor words do not transfer between languages. Energetic and bright travel intact, but most resolve to a different sound depending on the language they are read in, so a brief that produced a warm voice in one language will not produce the equivalent warmth translated into another. Write it in Spanish terms rather than translating one that worked elsewhere.
Writing your first prompt? How to write a voice prompt covers every part a prompt can carry, and what each one changes.
A Castilian Spanish female voice, 20 to 30: glossy and confident, with high pitch, fast pacing, high energy, bright sparkling resonance and girly chatter. Ideal for a friendly receptionist or assistant. Name the accent as Castilian Spanish, then set the age, the pitch, the pace, the energy and what the voice is for. Every accent Gradium maps is reached the same way.
Distincion above all: Castilian keeps the theta sound for c before e or i, and for z, so cielo and zapato carry a th that no Latin American variety has. This one feature separates Castilian from all ten other Spanish accents on its own.
24 are ready to call today, with no design step: pick a voice id and go. Design one when you want an age, texture or persona of your own.
Those are names for the same territory, and this page covers them. Castilian Spanish is the wording Gradium maps, so that is what to name in the prompt, but a brief written in any of these terms lands in the same place. The regional variants section below names each one separately, with the label that gets it.
Both. Gender is its own part of the prompt, so it changes on its own: swap male for female and everything else holds. Same accent, same age, same delivery, different voice.
Yes. A designed voice is generated rather than cloned from a person, so there is no actor to license and no session to re-book when the script changes.
Every voice we ship clears blind listener comparison and an ELO ranking first, because roughly one candidate in a thousand has it. For Castilian Spanish, the feature that decides it is usually Distincion.
Open a voice, type your own script, and listen. Then write a prompt of your own to design a variant. No recording, no casting, no licensing.