One speaker. Any number of listeners. Up to 10 languages — all at the same time. Here's the full picture of what happens from the moment you start speaking to the moment your audience hears you in their language.
SpeakCast is a real-time speech translation platform. A speaker talks in English. SpeakCast listens, translates, and broadcasts translated audio to every listener's phone — in their own language — within about 1–2 seconds.
There's no dedicated hardware, no interpreter booth, no expensive equipment to rent. The speaker needs a laptop with Chrome. Every listener needs any smartphone and a pair of headphones. That's it.
Speakers choose which languages to offer each session — from 1 to 10 languages depending on their plan. Listeners then join and select their own language from only the ones the speaker has enabled, keeping the experience clean and focused.
Most translation tools serve one language at a time. SpeakCast serves all selected languages simultaneously from a single session. A Spanish-speaking family, a Mandarin-speaking visitor, and a Vietnamese couple can all be sitting in the same pew — and each of them hears the exact same sermon translated into their own language, in real time, through their own headphones. And it doesn't stop at the building door: a listener watching the church livestream from home — or from anywhere in the world — can open SpeakCast on their phone and follow along in their language just as easily as someone sitting in the front row. No separate systems. No separate codes. One session, every language at once.
This is what makes SpeakCast different from a simple translation tool. Every listener in the room gets their own private audio stream — independently selected, simultaneously broadcast.
There is no limit on how many listeners can join a session. Whether it's 5 people in a Bible study or 200 in a Sunday service, every listener gets the same real-time experience. And because each listener's phone handles its own audio playback, the speaker's device is never overloaded — it just sends text.
SpeakCast is built entirely on modern web standards — no proprietary apps, no plugins, no special hardware.
Web Speech API is built into Google Chrome and converts speech to text locally on the speaker's device. The audio itself never leaves the laptop — only the transcribed text is sent to the server, which means audio privacy is built in by design.
WebSockets keep a persistent, live connection open between the server and every listener's phone. The moment translated text is ready, it's pushed to all connected devices instantly — no polling, no page refreshes, no delay from HTTP request cycles.
DeepL is one of the most accurate machine translation engines available, trained on high-quality professional translation data. SpeakCast uses DeepL as its primary translation engine, with automatic fallback layers to ensure delivery even if one service is temporarily unavailable.
Text-to-Speech runs entirely on each listener's phone using the operating system's native voice engine. This means the audio sounds natural in the listener's language, and it works on any modern smartphone — iPhone or Android — without any app install.
When a listener joins a SpeakCast session, they see a clean listener screen that shows the translated text scrolling in real time as the speaker talks. The phone also reads each phrase aloud through their headphones as soon as it arrives.
The listener screen keeps the last few lines of translated text visible — older lines fade out as new ones come in — so if a listener misses a word, they can glance at the screen to catch up.
A Wake Lock keeps the phone screen from going dark mid-service, so listeners don't have to keep tapping their screens to keep the audio flowing. Once they join and tap the audio unlock button, the experience is completely hands-free for the duration of the service.
There is no delay between listeners in different languages. All translations are broadcast in parallel — the Spanish listener and the Mandarin listener hear their respective translations at the same moment. No one is waiting for another language to finish processing first.
From the moment the speaker finishes a sentence to the moment the listener's phone begins speaking the translation: approximately 1–2 seconds on a good internet connection. This is fast enough that the translation stays in sync with the speaker's body language, gestures, and natural rhythm. Listeners follow along just like a live interpreter — they're only a breath or two behind.
SpeakCast was designed with churches in mind. Many congregations today include members and visitors who speak little or no English — but hiring a human interpreter for multiple languages isn't practical or affordable for most churches.
With SpeakCast, a church with Spanish-speaking families, a Vietnamese couple, a Tagalog-speaking visitor, and a Mandarin-speaking guest can all hear the sermon in their own language — whether they're sitting in the same pew or watching the livestream from home, from another city, or from another country. All of them tune in to the same session simultaneously, each hearing their own language in real time.
SpeakCast works equally well for:
No venue modifications. No renting interpreter equipment. No advanced scheduling. Just open a browser, share a 4-digit code, and speak.