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We make Espero, so it is listed first. Check our claims against the sources below.
This guide compares seven tools that bring live translation to conferences, seminars, training sessions, church services and other events. For each tool, we read the provider's own public pages on 14 November 2026. We did not test sound or translation quality. Prices change, so confirm the final price with the provider before you buy. "Not stated publicly" means that we did not find the information on the pages listed in the sources.
Best for: company staff events and training, also for multilingual staff; conferences and seminars; event technology companies that run events for their clients; sports and exercise events with instructors from abroad; churches, associations and schools. Guests follow on their own phones, one interpreter is enough, and the organizer stays in touch with guests after the event.
Best for: organizers who run many sessions per year in many languages and want one hourly price for all languages, with transcripts and summaries after each session.
Best for: large international events where some sessions need professional interpreters, including sign language, and other sessions can use AI.
Best for: organizations that need human interpretation in many spoken and sign languages, and venues that want translation available in their rooms at all times.
Best for: organizers who want the translated voice to sound like the speaker, and one-time events that fit a price per day.
Best for: health care organizations, public bodies and companies that need professional interpreters, AI translation and compliance documents from one provider.
Best for: organizers who want to pay by the minute, and briefings where the organizer needs a record that each listener understood.
| Tool | Espero | Wordly | Interprefy | KUDO | Maestra Live | Boostlingo Events | Spiiksi |
|---|---|---|---|---|---|---|---|
| How guests join | EsperoYes: QR code or link in the browser. No app, no account | WordlyYes: QR code or link in the browser. No download, no account | InterprefyPartly or with conditions: Mobile app (QR code or event token) or link in the browser | KUDOYes: QR code or link in the browser. No download | Maestra LiveYes: QR code or link in the browser. No app, no account | Boostlingo EventsPartly or with conditions: QR code or link (AI), no app or account. App for interpreted conferences | SpiiksiYes: QR code or link in the browser. No account for public events |
| Languages | Espero100+ | Wordly60+ | Interprefy80+ (AI) | KUDO70+ (AI). 200+ with interpreters | Maestra Live100+ | Boostlingo Events130+ (AI). 300+ with interpreters | Spiiksi70+ spoken |
| AI voice | EsperoYes | WordlyYes | InterprefyYes | KUDOYes | Maestra LiveYes | Boostlingo EventsYes | SpiiksiYes |
| Translation in the speaker's own voice | EsperoYes, an AI voice made from the speaker's voice; conditions below | WordlyNot stated publicly | InterprefyNot stated publicly | KUDONot stated publicly | Maestra LiveYes, AI voice cloning on the Personal plan | Boostlingo EventsNot stated publicly | SpiiksiYes, voice cloning from a short recording, with the speaker's consent |
| Human interpreters | EsperoYes: Works alongside your interpreter: one interpreter is enough, Espero adds the other languages | WordlyNo (AI only) | InterprefyYes, 6,000+ professional interpreters | KUDOYes, 12,000+ interpreters | Maestra LiveNot stated publicly | Boostlingo EventsYes | SpiiksiYes: Your own interpreters can broadcast alongside AI |
| Questions from listeners in their own language | EsperoYes. Written in the event group; the organizer can show a question on the screen without the name | WordlyNot stated publicly | InterprefyNot stated publicly | KUDOPartly or with conditions: Turn-based questions in the KUDO platform | Maestra LiveYes: Spoken questions from the floor are translated | Boostlingo EventsYes: Translated chat messages and polls | SpiiksiYes, typed or spoken, in paid plans |
| Connection after the event | EsperoYes: The event group continues before, during and after, each person in their own language | WordlyNot stated publicly | InterprefyNot stated publicly | KUDONot stated publicly | Maestra LiveNot stated publicly | Boostlingo EventsNot stated publicly | SpiiksiYes: Standing rooms keep messages for 30 days |
| Pricing model | Espero€2.50 per language per hour with an annual subscription, €3.00 monthly, €3.30 one-off, plus VAT. 7 hours free with 3 caption languages (including the spoken language) and 1 listening language | WordlyHour packages, all languages included. From about USD 1,500 for 10 hours | InterprefyTailored quote: hourly, daily or plans | KUDOQuote. Pay as you go, one-off events, or annual plans from 50 hours | Maestra LiveEvents from USD 799 per day. Organizations plan USD 359 per month, billed annually | Boostlingo EventsQuote | Spiiksi€0.25 per minute per listening language, plus VAT. Monthly plans from €0 |
| Text and records after the event | EsperoYes: Transcript as PDF, TXT or HTML | WordlyYes: Transcripts, summaries, attendee notes | InterprefyYes: Recordings, transcripts and summaries as a service | KUDOYes: Recordings in each language | Maestra LiveYes: Recording, transcript, AI summary | Boostlingo EventsYes: Transcripts and AI summaries | SpiiksiPartly or with conditions: Audio recorded only on request |
| Where data is stored | EsperoAccount and message records in the EU (Ireland). Some AI processing in the US | WordlyServer in the United States | InterprefyAWS. EU data residency available | KUDOAWS. Hosting in the US or the EU | Maestra LiveAWS servers in the United States | Boostlingo EventsNot stated publicly | SpiiksiNot stated publicly. OpenAI and Microsoft Azure process speech |
Espero is a multilingual messaging app with live captions for events. The speaker talks in their own language, and several speakers can use different languages. Each guest opens a QR code or a link and reads live captions or listens to an AI voice in their own language on their own phone. Guests need no app and no account. The captions can also run on a screen in the venue and in a livestream through OBS, vMix or ProPresenter. After the broadcast, the organizer can correct the text, and the correction updates every language. The text downloads as PDF, TXT or HTML.
The speaker's own voice. Listeners can hear an AI voice made from the speaker's voice when the speaker broadcasts from their own Espero account, has a ready My voice and a personal subscription, and the sound comes through Microphone (the device microphone or a mixing desk). The organizer must confirm in the organizer view that they are the only speaker and turn the confirmation off before anyone else speaks. This works in languages that support listening. Computer audio and broadcasts without that confirmation use the regular AI voice.
Every event in Espero has its own group conversation before, during and after the event, in each person's own language. Before the event, the invitation and the schedule are in the group. During the event, a guest can send a question in their own language, and the organizer can show it on the room screen without the sender's name. After the event, the conversation continues: each person reads and writes in their own language, can ask the speaker questions and stays in touch. The group also translates the material shared in it: messages, voice messages, images (also the text in images) and videos reach each member in their own language. The event does not end when the captions stop. Reading and listening need no account. To join the group, a guest needs a free Espero account, and an email address is enough.
Price as of : captions in the spoken language are included. Each translation language and each listening language costs €2.50 per hour with an annual subscription, €3.00 per hour with a monthly subscription or €3.30 per hour as a one-off purchase, plus VAT. Up to 400 listeners per event are included. The first 7 hours are free, and no card is needed. The trial includes 3 caption languages (including the spoken language) and 1 listening language.
Espero works with your interpreter, and one interpreter is enough. The organizer adds the interpreter's language to the event and turns on "An interpreter repeats the speech". The speaker and the interpreter can speak different languages. Espero then brings in all the other languages: everyone gets the text in their own language and can also listen to the translation.
Limits: Espero works with the interpreter you have, but it does not book interpreters or supply equipment. The AI voice is available in many languages, but not in all of them.
Wordly is an AI platform for live translation, captions, transcripts and summaries at meetings and events. Guests join in the browser with a QR code or a link. They choose to read, to listen or both. All supported languages are included in the hourly price. Wordly works with many meeting and event platforms. Its audience engagement features let guests react, highlight moments and export their notes.
Interprefy is a Swiss company. It offers professional human interpretation, AI speech translation and live captions on one platform. Guests listen in the Interprefy mobile app or in a browser. Interprefy connects to meeting platforms such as Microsoft Teams, Zoom, Google Meet and Webex, and to the sound systems of venues. Recordings, transcripts and summaries are available as a media service after the event.
KUDO combines AI speech translation and captions with a marketplace of professional interpreters. Guests scan a QR code or open a link and listen in the browser, with no download. Venues can install a permanent QR code in their rooms. KUDO connects to platforms such as Zoom and Microsoft Teams. Recordings can be downloaded in each language.
Maestra Live gives each guest an AI voice and live captions on their own phone. Guests scan a QR code, and the session opens in the browser with no app and no account. Guests can hear a cloned version of the speaker's voice. AI voice cloning is included in the Personal plan. The captions can also be shown on the venue screen. After the session, the recording, the transcript and an AI summary can be saved.
Boostlingo offers both AI live translation and professional interpreters for events. For AI translation, guests scan a QR code or open a link, with no app and no account. For conferences with interpreters, there is also a Boostlingo Events app for iOS and Android. Boostlingo works inside Zoom, Teams, Google Meet and Webex. Transcripts and AI summaries are available after the event.
Spiiksi is a Finnish AI interpretation service. Guests scan a QR code or open a link and listen in the browser. Public events need no account. Guests can also read the interpretation as text. The paid plans include audience questions, polls, comprehension checks, announcements and discussion. Spiiksi also has standing rooms for conversations that last beyond one event. Room messages are kept for 30 days. Your own human interpreters can broadcast in the same event alongside the AI languages.
Ask these questions before you choose a tool:
Not with most tools in this comparison. With Espero, Wordly, KUDO, Maestra Live, Spiiksi and the AI translation of Boostlingo, guests open a QR code or a link in the browser. Interprefy offers both a mobile app and a browser option.
It depends on the pricing model. As of 14 November 2026, Espero costs €2.50 per language per hour with an annual subscription, plus VAT, and captions in the spoken language are included. Spiiksi charges €0.25 per minute per listening language, plus VAT. Wordly sells hour packages with all languages included, from about USD 1,500 for 10 hours. Maestra lists event pricing from USD 799 per day. Interprefy, KUDO and Boostlingo give prices on request.
For many events, AI captions and an AI voice are enough for guests to follow. For high-stakes content, sign language and sensitive moments, a professional interpreter is the safer choice. Interprefy, KUDO and Boostlingo provide interpreters. Espero and Spiiksi can work alongside an interpreter and add the other languages.
Yes. If an interpreter is present at the event, Espero brings in all the other languages. Everyone gets the text in their own language and can also listen to the translation. One interpreter is enough. The organizer adds the interpreter's language and turns on "An interpreter repeats the speech".
In Espero: Listeners can hear an AI voice made from the speaker's voice when the speaker broadcasts from their own Espero account, has a ready My voice and a personal subscription, and the sound comes through Microphone (the device microphone or a mixing desk). The organizer must confirm in the organizer view that they are the only speaker and turn the confirmation off before anyone else speaks. This works in languages that support listening. Computer audio and broadcasts without that confirmation use the regular AI voice. Maestra Live offers AI voice cloning on its Personal plan, and Spiiksi offers voice cloning from a short recording, with the speaker's consent.
Yes, with several tools. Espero has a projector view, and the same link works on a screen in the venue. Wordly and Maestra Live can also show captions on screens in the room.
Yes, in several tools. In Espero, questions go to the event group, and the organizer can show one on the screen without the name. In Spiiksi's paid plans, listeners type or speak a question in their own language. Maestra Live translates spoken questions from the floor, and Boostlingo translates chat messages and polls.
Most tools give a transcript, and several also give AI summaries or recordings. In Espero, every event has a group where the conversation continues after the event, each person in their own language, and guests can ask the speaker questions. The group also translates shared material such as images, videos and voice messages. Spiiksi has standing rooms that last beyond one event, with messages kept for 30 days.
All pages were checked on 14 November 2026.