Vocnu vs DubMog, the same scene in French
On the same film scene, Vocnu started every French line within half a second of its speaker, while DubMog's voice came 2 to 4 seconds behind, as a live dubber does. Vocnu's lines were whole and right; DubMog's turned "fungus freak" into "without mushrooms", lost the teasing of another line and ran two speakers together. Vocnu also shows subtitles over the video, and a new account gets 20 free minutes of Premium voice-over. DubMog is the cheaper way to dub live: Pro Live costs about 2 to 3 cents a minute on its Pro plan, its Standard mode is free, and it runs on phones and in Mac and Windows apps too. Vocnu publishes this page. We ran both on 10 November 2026. Vocnu read the video's captions, while DubMog listens to the sound, which is how it can dub whatever plays.
For Chrome 120 or newer, Brave and Edge on a computer.
The short answer
Pick Vocnu if you want the voice in step with the speakers, every line translated whole, subtitles over the video, and to pay only for the minutes you watch with credits that never expire. Pick DubMog if you want live dubbing for the least money, a free mode read in your computer's own voice, or dubbing on a phone, in a desktop app, or of a call or a meeting.
What we tested
- The scene: Sprite Fright, Blender Studio's open movie, played from Blender Studio's YouTube channel, with English speech and the video's English captions. We compare the lines from 1:40 to 2:02, which both extensions voiced.
- The language: French, which both extensions offer.
- DubMog: version 0.7.18 from the Chrome Web Store, in a fresh Chrome profile, without an account, on the free taste of Pro Live, its natural voice. The taste is short, so we switched DubMog on at 1:35, a few seconds before the first line we compare. Its free Standard mode, read in the computer's own voice, we did not test.
- Vocnu: version 0.5.68 of the extension, signed in to a Vocnu account, with Premium voice-over, its default, switched on at 1:20. It read the video's English captions; DubMog listens to the sound.
- How we watched: we logged the player's time, speed and volume about once a second, recorded the sound the browser played and saved screenshots. DubMog showed no text over the video, so we wrote its French down from the recording with speech recognition and checked each line with a second model.
What happened
| In the test | Vocnu | DubMog |
|---|---|---|
| Timing | Every line started within half a second of its speaker | Every line came 2 to 4 seconds after its speaker |
| First French voice | About 38 seconds after switching on, after a pause at the start | About 8 seconds after switching on, with no pause |
| Video speed | Normal all the way | Normal all the way |
| The film's own sound | Lowered to about a tenth once the dialogue began | Turned down while its voice spoke and back up between lines |
| Subtitles | French, over the video | None over the video |
| The free trial | Ran on the account's credits | The taste ended at 2:12, when DubMog paused the video and asked us to sign in |
The gap is how the two work. DubMog listens to what is said and speaks the translation as it goes; its own site says it speaks it back "a few seconds later". Vocnu read the captions and prepared the voice-over a little ahead, which is why it paused at the start and then kept every line with its speaker, with the film at normal speed. In a scene where people answer each other quickly, 2 to 4 seconds is long enough that the French reply arrives while the next character is already talking.
The same lines in French
These are the lines from 1:40 to 2:02 as each extension voiced them, next to the video's English captions. DubMog's are as we heard them, with how far behind its speaker each one started.
| English caption | Vocnu | DubMog, as we heard it |
|---|---|---|
| Oy, fungus freak! Make yourself useful and fix the tent. | Hé, espèce de dingue des champignons ! Rends-toi utile et répare la tente. | Oh, hey, sans champignons, rends-toi utile et répare la tente. (2 seconds behind) |
| Oh, a bit of friendly campsite ribbing. Fun. | Oh, juste quelques taquineries amicales au camping. Sympa. | Oh, le camping amical, amusant. (3.5 seconds behind) |
| She wouldn't survive 5 minutes alone in these woods. | Elle tiendrait pas cinq minutes seule dans ces bois. | Ah, elle n'aurait pas survécu cinq minutes seule dans ces bois. (2 seconds behind) |
| Yeah. She's a real weenie that one, innit? | Ouais. Quelle trouillarde, celle-là ! | Ouais, c'est une vraie mauviette celle-là, n'est-ce pas ? (almost 4 seconds behind) |
| Oy, Phil! How those sausages coming? Almost ready! Just need a bit more salt... | Hé, Phil ! Alors, elles en sont où, ces saucisses ? C'est presque prêt ! Il manque juste un peu de sel... | Hey, Phil, je sais que les saucisses arrivent, presque prêtes. On va avoir besoin d'un peu plus par contre. (3 seconds behind) |
Vocnu kept the meaning of every line and the casual tone of friends at a campsite. DubMog got two lines right, and its "vraie mauviette" for "real weenie" is a good choice. In the others, "fungus freak" became "sans champignons", which means "without mushrooms"; the friendly ribbing became "the friendly campsite, fun"; the question to Phil and Phil's answer ran together into one statement; and the salt was lost. DubMog's own FAQ says its real-time translation is "great for conversation and following a story, but it can be imperfect".
How they sound
We recorded what the browser played in both runs. Below are the same 16 seconds from each, from "Oy, fungus freak!" on. Both clips are set to the same overall loudness and are otherwise as recorded, so you can hear when each voice comes in against the actors.
Vocnu keeps the film low and steady under its voice for the whole dialogue. DubMog turns the film down while its voice speaks and lets it back up between lines, so you hear more of the actors in the gaps, and you hear each English line before its French one.
What each one offers
Quotes on DubMog's side are its own words from its Chrome Web Store listing, its home page and its pricing page, read on 10 November 2026. We tested only what the sections above describe.
| Feature | Vocnu | DubMog, from its site |
|---|---|---|
| How it hears the video | Reads the video's captions or subtitles when it has them, and otherwise listens to its sound | Listens to the tab's sound and speaks it back "a few seconds later" |
| Where it works | Any page with an HTML5 video player, players inside frames included, and YouTube live streams | "any tab's audio", in Chrome and Edge |
| Devices | Chrome 120 or newer, Brave and Edge on a computer, and an app for your own video files | Chrome and Edge, iPhone and Android apps, a Mac app (macOS 14 or later), a Windows 11 app and a Web Studio |
| Languages | 35 | Pro Live in 80+, free Standard in 38 in Chrome |
| Voices | Natural, expressive voices in Premium; a female and a male voice in Standard, and in Economy for all but Croatian and Slovenian | Standard reads in your computer's own voice; Pro Live "adds a natural AI voice" |
| Text on screen | Subtitles over the video, in fullscreen too, or subtitles without the voice | "a transcript in the side panel" |
| Your own files | Upload a video and get a finished MP4, the voice-over and subtitles | Dub a File on iPhone and Android: "get back a finished video" |
| Price | €0.03 to €0.20 a minute with a voice, credits that never expire | Standard free; Pro $9.99 a month or $79.99 a year for about 300 minutes of Pro Live a month; packs from $1.99 that never expire |
When DubMog is the better choice
- You want a live voice for the least money. On a Pro plan, Pro Live works out to about 2 to 3 cents a minute if you use the month's minutes, less than any of Vocnu's grades.
- You want it free. DubMog's Standard mode costs nothing and is unlimited with a free account; it reads in your computer's own voice, which we did not try.
- You want the voice right away. DubMog spoke about 8 seconds after we switched it on, with no pause; Vocnu paused about half a minute first.
- You want it on your phone, in a Mac or Windows app, or for a call or a meeting.
- Your language is one of Pro Live's 80+ that are not among Vocnu's 35.
Price per minute
Vocnu charges credits for the minutes it voices, and the price depends on the voice quality you choose. DubMog sells Pro Live by subscription or in packs. In euros for Vocnu, depending on the credit pack, and in US dollars for DubMog:
| Option | A minute | An hour |
|---|---|---|
| Vocnu Premium, used in this test | €0.13 to €0.20 | €7.92 to €12.00 |
| Vocnu Standard | €0.07 to €0.10 | €3.96 to €6.00 |
| Vocnu Economy | €0.03 to €0.05 | €1.98 to €3.00 |
| DubMog Pro Live taste, used in this test | $0, a few times a day | Ours ended after about half a minute of film |
| DubMog Pro Live on Pro, from its site | $0.022 to $0.033 | $1.32 to $1.98 |
| DubMog Pro Live from packs, from its site | $0.06 to $0.10 | $3.60 to $6.00 |
| DubMog Standard, from its site | $0 | Unlimited with a free account |
DubMog's figures are its own cost per Pro Live minute: on Pro, $79.99 a year or $9.99 a month for about 300 minutes a month that do not carry over, so they hold only if you use them; its packs never expire. Vocnu also takes US dollars at checkout, where VAT or sales tax is added on top: Premium then comes to $0.15 to $0.24 a minute, Standard to $0.07 to $0.12 and Economy to $0.04 to $0.06. Vocnu's Economy costs about the same as DubMog's packs or less; DubMog on a Pro plan costs less than any of Vocnu's grades.
Vocnu's credits never expire, watching the same minutes again within 30 days costs nothing, and so does a video already in your language. A new account gets 40 free credits once it confirms its email: 20 minutes of Premium voice-over, 40 of Standard or 80 of Economy.