Captio AI

Captio AI vs duna

Captio AI vs duna, the Spanish caption app for iPhone and Mac: Catalan and Basque captions, offline on the device, who is talking, translation and price.

Facts checked on each company's own pages. How we compare

duna

by Oriol O'Callaghan

iPhone, Mac (Apple silicon)

vs

Captio AI

Our app

iPhone, iPad, Android

The short answer

Choose duna if you read captions in Spanish, Catalan, Galician, Basque or English on an iPhone with iOS 26 or an Apple silicon Mac and want them free, steady on the screen and fully offline, with nothing leaving the device. Choose Captio AI if you need Android, an older iPhone, speech that switches between Catalan and Spanish in one stream, other languages or live translation, or captions that name the people talking and recordings that sync and turn into summaries.

Choose duna if

you read Catalan, Galician, Basque or Spanish, want captions that work in airplane mode with nothing sent anywhere, want them free on both iPhone and Mac, or need .srt subtitles for your own videos.

Choose Captio AI if

you use Android or an iPhone below iOS 26, need translation, languages beyond duna's five, or captions that follow a switch from Catalan to Spanish mid-sentence, want names on each speaker's lines (Recognize Voices on iPhone), or want recordings synced with summaries and to-dos.

Side by side

Captio AI vs duna, feature by feature

Tap any fact to see the details and the page it comes from.

Captio AI vs duna: features compared, facts checked 28 October 2026
Languages for live captionsCaptio AI
Yes: 60+ languages

Captions and translation in 60+ languages, including speech that switches languages mid-sentence.

Sources: Apple App Store listing, Live Captions (Captio AI)

duna
Yes: 5: Spanish, Catalan, English, Galician, Basque

You choose one language per session and download it once. Galician and Basque are marked New: they are the most recent and make more mistakes. The Catalan voice model comes from the Barcelona Supercomputing Center (Projecte Aina) and the Basque one from HiTZ (UPV/EHU).

Sources: duna overview (Oriol O'Callaghan), duna terms of use (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store)

Live captions without internetCaptio AI
Partly: Records offline, captions later

Live captions need internet. Without a connection it keeps recording and transcribes automatically when the phone is back online.

Sources: Apple App Store listing, Live Captions (Captio AI)

duna
Yes, after a one-time language download

Internet is only needed to download a language. After that, listening, transcribing and making subtitles all work offline, also in airplane mode.

Sources: duna overview (Oriol O'Callaghan), duna support and FAQ (Oriol O'Callaghan), duna website (Spanish) (Oriol O'Callaghan)

Where speech is processedCaptio AI
Yes: Cloud; audio not stored on its servers

Speech is processed by third-party speech recognition after you agree. Audio is not stored on Captio AI's servers; content is never sold or used to train AI models.

Source: Captio AI privacy policy

duna
Yes: On the device; nothing is sent

Voice, text and videos are processed on the iPhone or Mac and never sent anywhere. No audio is saved to a file. Its only internet use is downloading languages, from Apple or, as a fallback, from a copy on GitHub. The App Store privacy label says no data is collected.

Sources: duna privacy policy (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store), duna website (Spanish) (Oriol O'Callaghan)

Works onCaptio AI
Yes: iPhone, iPad, Android

On the App Store (also listed for Apple silicon Macs and Apple Vision) and on Google Play since October 2026.

Sources: Apple App Store listing, Google Play listing

duna
Yes: iPhone, Mac (Apple silicon)

One free download gives you the iPhone app and the Mac app. Each device transcribes on its own and nothing travels between them. A Google Play search finds no duna app.

Sources: duna overview (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store), Google Play search

NeedsCaptio AI
Yes: iOS 15.1 or later

The App Store lists iOS 15.1 or later for iPhone.

Source: Apple App Store listing

duna
Yes: iOS 26 or later; Mac: M1 or later, macOS 26

An iPhone on iOS 26 or later, or a Mac with Apple silicon (M1 or later) on macOS 26 or later. Each language takes 120 to 195 MB of space.

Sources: duna support and FAQ (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store), App Store data (Spain) (Apple)

Captions people in the roomCaptio AI
Yes, from the phone's microphone

Speech in the room appears as text while the person is still talking.

Sources: Apple App Store listing, Live Captions (Captio AI)

duna
Yes, from the microphone

Put the iPhone on the table between you and the speaker, tap anywhere on the screen and read. It works with the iPhone's own microphone, a wired one or Bluetooth headphones.

Sources: duna for iPhone guide (Oriol O'Callaghan), duna website (Spanish) (Oriol O'Callaghan)

Text size and coloursCaptio AI
Yes: Text size, colours, contrast

Text size, background colour and contrast can be adjusted.

Source: Live Captions (Captio AI)

duna
Yes: Text holds still; large type, 4 fonts, light or dark

Lines you have read never move: the newest line stays at the same height and older lines roll up. Type goes from comfortable to huge, in four typefaces, two of them (Atkinson Hyperlegible) designed for low vision, in light or dark mode. Three profiles trade steadiness for speed.

Sources: duna overview (Oriol O'Callaghan), duna for iPhone guide (Oriol O'Callaghan), duna for Mac guide (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store)

Add your own words and namesCaptio AI
Yes, words and names

Add names, medical terms or specialist words so they are recognised.

Source: Live Captions (Captio AI)

duna
Yes, up to 40 terms

Add the day's names, places, brands and acronyms. duna favours them while it listens, and a change applies at once, even mid-session.

Sources: duna for iPhone guide (Oriol O'Callaghan), duna for Mac guide (Oriol O'Callaghan)

Group conversationsCaptio AI
Partly: One phone: speaker labels, names, direction

One phone captions the whole table and labels each speaker. On iPhone it can name people by their voice, and on iPhone 16 and later a wave shows which side a voice comes from. Shared folders let several people add recordings to one place; live captions are not joined across phones.

Sources: Apple App Store listing, Recognize voices (Captio AI) (Captio AI), Speaker direction (Captio AI) (Captio AI), Live Captions (Captio AI)

duna
Partly: New paragraph when the voice changes

When a different person starts speaking, duna usually begins a new paragraph. It does not say who is speaking, and it warns that several people talking at once causes more mistakes.

Sources: duna for Mac guide (Oriol O'Callaghan), duna privacy policy (Oriol O'Callaghan), duna overview (Oriol O'Callaghan)

Shows who is talkingCaptio AI
Yes, live and saved; names by voice on iPhone

Separates speakers (Speaker 1, Speaker 2). On iPhone it can learn saved voices and show their names instead.

Sources: Apple App Store listing, Recognize voices (Captio AI) (Captio AI), Live Captions (Captio AI)

duna
Partly: No names or labels; new paragraph per voice

duna detects that the voice has changed only to start a new paragraph. Its privacy policy says it does not identify who is speaking.

Sources: duna privacy policy (Oriol O'Callaghan), duna for Mac guide (Oriol O'Callaghan)

Remembers people's voicesCaptio AI
Yes, Recognize Voices (iPhone)

Save someone's voice once (about 20 seconds of talking, or an audio file) and their name and emoji show on every line they say, live and in saved recordings, instead of "Speaker 2". Voiceprints are made on the iPhone and never uploaded. When someone new talks for a while, Captio AI asks who it is. Free plan: your own voice plus one other person; Plus: more people.

Source: Recognize voices (Captio AI) (Captio AI)

duna
No, it makes no voiceprint

The privacy policy says duna does not identify who speaks, creates no voiceprint and keeps nothing from the analysis of voice changes.

Source: duna privacy policy (Oriol O'Callaghan)

Shows where a voice comes fromCaptio AI
Yes, on iPhone 16 and later

With the iPhone flat on the table, a wave grows at the edge of the captions on the side the voice comes from, in that speaker's colour, while new words appear. It uses the iPhone's spatial microphones (not AirPods or an external mic), works in Live Captions and Live Translator, is calculated on the phone, and is free.

Source: Speaker direction (Captio AI) (Captio AI)

duna
Not stated

The iPhone guide says an orb at the top moves with the voices it hears; a direction for each voice is not described.

Source: duna for iPhone guide (Oriol O'Callaghan)

Alerts for soundsCaptio AI
Yes, sounds in the captions; alerts vibrate

Recognize Sounds (iPhone and iPad) writes sounds into the captions where they happen, like [doorbell rings], in Live Captions, Live Translator and uploaded files. A doorbell, knocking, a smoke alarm, a siren, a phone ringing or a baby crying makes the phone vibrate, with a notification when the screen is locked during a recording. It works while Captio AI is recording, not as an always-on alarm. Recognized on the phone; free; not on Android yet.

Source: Recognize sounds (Captio AI) (Captio AI)

duna
Not stated

Its pages don't describe alerts for sounds like a doorbell or an alarm.

Sources: duna overview (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store)

Live translationCaptio AI
Yes, live, two-way mode

Live translation next to the original captions, with a two-way mode where each person reads the other in their own language.

Sources: Apple App Store listing, Live Translator (Captio AI)

duna
Not stated

Its pages describe transcription in the one language you choose per session, with no translation.

Source: duna overview (Oriol O'Callaghan)

Saves transcriptsCaptio AI
Yes, with audio, synced

Recordings are saved with their audio in a searchable library and synced to your account.

Sources: Apple App Store listing, Captio AI privacy policy

duna
Yes, text on the device; no sync

Every session you stop is kept in duna's folder, listed by day with a search, where you can give it a title, correct the text and export it. No audio is recorded to a file, and transcripts don't sync between the iPhone and the Mac.

Sources: duna for iPhone guide (Oriol O'Callaghan), duna overview (Oriol O'Callaghan), duna privacy policy (Oriol O'Callaghan)

Export and shareCaptio AI
Yes: Text, link, PDF, email

Share a transcript or summary as text, a link, a PDF, an email, or a prompt for an AI chat.

Source: AI Summary (Captio AI)

duna
Yes: Text, Markdown, .srt; video with subtitles

Exports a transcript as plain text, Markdown or .srt subtitles timed word by word, to Notes, Files, AirDrop or any app. Video subtitles can be exported burnt into a copy of the video, which goes straight to Photos on the iPhone.

Sources: duna overview (Oriol O'Callaghan), duna for iPhone guide (Oriol O'Callaghan), duna for Mac guide (Oriol O'Callaghan)

Transcribes audio and video filesCaptio AI
Yes: Audio and video files

Upload audio or video and get a full transcript with speaker labels.

Sources: Apple App Store listing, Audio Transcription (Captio AI)

duna
Yes: Video and audio files, on the device

Choose a video or audio file, say which language is spoken, and duna writes .srt subtitles on the device, then opens a line-by-line editor. A 15-minute episode takes under a minute on a recent Mac, a little longer on an iPhone.

Sources: App Store listing (Spain) (Apple App Store), duna for Mac guide (Oriol O'Callaghan), duna support and FAQ (Oriol O'Callaghan)

AI summariesCaptio AI
Yes: Summary, key points, to-dos

Turns transcripts into summaries, key points, notes, to-dos and follow-up messages. Free plan: 3 summaries in total.

Sources: Apple App Store listing, AI Summary (Captio AI)

duna
Not stated
Free planCaptio AI
Yes: 100 free credits a day + 3 summaries

Free every day: 100 free credits a day for live captions or transcription, and 3 AI summaries in total.

Sources: Apple App Store listing, Captio AI for AI assistants (llms.txt)

duna
Yes: Free, every feature

Every feature is free on the iPhone and the Mac, with no limit described.

Sources: duna overview (Oriol O'Callaghan), duna terms of use (Oriol O'Callaghan)

Paid plansCaptio AI
Yes: US$14.99/month or US$79.99/year

Captio AI Plus on the US App Store, October 2026. No free trial. Prices differ by country.

Source: Apple App Store listing

duna
No paid plan

No subscription, no in-app purchases and no ads (Spanish App Store and duna's terms, November 2026).

Sources: duna terms of use (Oriol O'Callaghan), duna overview (Oriol O'Callaghan), App Store data (Spain) (Apple)

Key differences

What actually sets them apart

Does duna work in Catalan?

Yes. duna captions Spanish, Catalan, English, Galician and Basque, one language per session, each downloaded once. Galician and Basque are marked New and make more mistakes. Captio AI captions Catalan, Galician and Basque too, among 60+ languages, and keeps one caption stream going when a speaker switches between Catalan and Spanish.

Sources: duna overview (Oriol O'Callaghan), duna terms of use (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store), Apple App Store listing, Live Captions (Captio AI), Captio AI in Catalan, Captio AI in Galician, Captio AI in Basque

Does duna work in airplane mode?

Yes. Once a language is downloaded (120 to 195 MB), listening, transcribing and video subtitles all run on the device without internet, and nothing is sent anywhere. Captio AI needs a connection for Live Captions and processes speech in the cloud; offline it records and transcribes when you're back online.

Sources: duna overview (Oriol O'Callaghan), duna support and FAQ (Oriol O'Callaghan), duna website (Spanish) (Oriol O'Callaghan), duna privacy policy (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store), App Store data (Spain) (Apple), Apple App Store listing, Live Captions (Captio AI), Captio AI privacy policy

Is duna on Android or older iPhones?

No. duna runs on an iPhone with iOS 26 or an Apple silicon Mac with macOS 26, and Google Play has no duna app. Captio AI has an Android version and also supports iPad and iPhones as old as iOS 15.1.

Sources: duna overview (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store), Google Play search, duna support and FAQ (Oriol O'Callaghan), App Store data (Spain) (Apple), Apple App Store listing, Google Play listing

Does duna show who is speaking?

Not by name. duna opens a new paragraph when the voice changes, and its privacy policy says it neither identifies the speaker nor builds a voiceprint. Captio AI tags the voices as Speaker 1, Speaker 2, and on iPhone replaces the tag with a name for anyone whose voice you recorded once.

Sources: duna privacy policy (Oriol O'Callaghan), duna for Mac guide (Oriol O'Callaghan), Apple App Store listing, Recognize voices (Captio AI) (Captio AI), Live Captions (Captio AI)

Can duna translate for tourists in Barcelona?

No translation is described: duna writes down the one language picked for the session. Captio AI's Live Translator sets a translation beside the original captions, and in two-way mode the visitor and you each read the other in your own language.

Sources: duna overview (Oriol O'Callaghan), duna terms of use (Oriol O'Callaghan), App Store listing (Spain) (Apple App Store), Apple App Store listing, Live Translator (Captio AI)

Is duna really free on iPhone and Mac?

Yes. One free download covers both, with every feature and no subscription, in-app purchase or ad (duna's terms and the Spanish App Store, November 2026). Captio AI's free plan is 100 free credits a day; its Plus plan is charged at US$14.99 per month or US$79.99 per year on the US App Store (October 2026), with no free trial up front.

Sources: duna overview (Oriol O'Callaghan), duna terms of use (Oriol O'Callaghan), App Store data (Spain) (Apple), Apple App Store listing, Captio AI for AI assistants (llms.txt)

Honest take

Where each one wins

Where duna is the better choice

Where Captio AI is the better choice

Try Captio AI free

Which one should you use?

It depends on where you are

Either one

A class taught in Catalan

duna captions Catalan on an iPhone, or on a Mac set up as a big screen in the room, with no internet once the language is downloaded. If the teacher switches between Catalan and Spanish, Captio AI keeps both in one caption stream; duna writes the one language chosen for the session.

Captions for this situation
duna

A train through the mountains with no signal

duna keeps captioning on the device in airplane mode. Captio AI only records there and writes the transcript later.

duna

Subtitles for a video you filmed

duna writes .srt subtitles on the device, lets you fix them line by line and burns them into a copy of the video. Captio AI transcribes the file with speaker labels, but its exports (text, link, PDF, email) don't include a subtitle file.

Captio AI

A work meeting where it matters who said what

Captio AI puts a speaker tag, or a saved colleague's name on iPhone, on every line, so later you can tell who promised what. duna marks a new voice with a new paragraph.

Captions for this situation
Captio AI

A visit to your CAP (health centre) you want to go over at home

Captio AI keeps the appointment with its audio, synced to your account, and AI Summary lists what the doctor asked you to do. duna keeps the text on the device it was made on.

Captions for this situation
Captio AI

Spanish captions on an Android phone

duna needs an iPhone on iOS 26 or an Apple silicon Mac. Captio AI runs on Android and captions Spanish.

Captions for this situation
How we compare

Facts you can check, not opinions.

From their own pages

Every fact comes from the company's website, help pages, privacy policy or store listing. Tap any fact to see the page it comes from.

Checked 28 October 2026

Each source has the date we opened it. If a company doesn't say something publicly, the table says "Not stated" instead of guessing.

We make Captio AI

So it's described with the same rules as every other app, limits included, and each page says where the other app is the better choice.

Something out of date? hello@captioai.app

FAQ

Frequently asked questions

Can I use duna on a Mac in a classroom in Barcelona?

Yes, if the Mac has Apple silicon and macOS 26: duna's Mac app is made as a big, calm screen for a room, a class or a meeting, and works offline once the language is downloaded. Captio AI is made for iPhone, iPad and Android; its App Store listing also lists Apple silicon Macs.

Does duna work in Basque or Galician?

Yes, both are among its five languages, marked New; duna says they are the most recent and make more mistakes than the other three. Captio AI captions Basque and Galician too, and follows a speaker who switches between either one and Spanish.

Does duna send my voice to a server?

No. Voice, text and videos stay on the iPhone or Mac, no audio is written to a file, and its App Store label reads "No se recopilan datos" (no data collected). Captio AI works the other way: speech goes to a cloud recognition service once you say yes, Captio AI doesn't store that audio on its own servers, and none of your content goes into training AI models.

Can duna make Spanish subtitles for my videos?

Yes. Pick a video or audio file, choose its language, and duna writes .srt subtitles on the device, then opens an editor and can export the video with the subtitles burnt in. Captio AI can transcribe the same file and mark who speaks when; you get it back as a transcript to read or share.

Can I use duna with AirPods or an external microphone?

Yes: the iPhone's own microphone, a wired one or Bluetooth headphones, and duna keeps listening when you switch; on the Mac you choose the microphone in its settings. Captio AI keeps captioning on AirPods or an external microphone too; only Speaker Direction, which reads the iPhone's own microphones, then stays hidden.

Do duna transcripts sync between my iPhone and Mac?

No: a session made on the Mac stays on the Mac, and one made on the iPhone stays there. Captio AI, once you sign in with Apple or Google, keeps recordings and their audio synced in your account.

Is duna available in Mexico?

Yes. The Mexican App Store lists it free too (November 2026), for iPhone and Mac. Captio AI is downloadable in Mexico and Spain alike, on iPhone or Android, and captions Spanish, with Plus priced per country.

Try Captio AI

Free to start, iPhone and Android

Sources

Every page this comparison uses, with the date we checked it.

Captio AI

duna

Published 2 November 2026. App names and trademarks belong to their owners. This page is not affiliated with or endorsed by the companies it compares.