A straight comparison from a London studio that records both — where AI genuinely wins, the three risks nobody budgets for, and when a human voice actor is worth £400 an hour.
In this article
Most comparisons of AI and human voice over are written by someone selling one of them. We record human voice over in our own London studios, so take the obvious bias into account — and then read the part where we tell you to use AI, because for a large share of corporate work it is the right answer and pretending otherwise wastes your budget.
Here is the short version.
Use AI voice over for internal training, product walkthroughs, release notes, knowledge bases, draft scratch tracks, and anything you expect to rewrite within six months.
Use a human voice actor when the audio is public-facing, when it carries the brand, when it has to persuade rather than inform, or when a mispronunciation would cost you more than the recording did.
Use both on the same project more often than you would expect: a human for the opening and the key messages, AI for the long modular middle. That hybrid is now the normal shape of a large e-learning build.
Where AI genuinely wins
Content that changes. If your script will be edited four times this year, a human recording is four re-records. AI regenerates in minutes at no incremental cost. A 40-module compliance course that gets a legal update every quarter is an AI job, and recording it with actors is a decision you will regret at the first amendment.
Volume at low stakes. Internal product walkthroughs, intranet explainers, IVR prompts for a system you are still redesigning. Nobody is forming an impression of your company from a how-to video about expense claims.
Speed when the deadline has already gone. AI delivers in minutes. We can usually record and deliver a corporate script the same day, but "the same day" is not "in ten minutes", and sometimes ten minutes is the actual requirement.
Scratch tracks. Timing a cut, checking whether a script fits 90 seconds, getting stakeholder sign-off before you spend on talent. Using AI for the rough and a human for the final is not a compromise — it is good production practice, and it is what we would tell you to do even though it means we record you once instead of twice.
Where AI costs more than it saves
Anything persuasive. Adverts, brand films, fundraising, recruitment. Persuasion runs on timing, emphasis and restraint, and those are performance decisions. An AI voice reads a sentence correctly. An actor reads it the way someone who means it would say it. On a brand film, that difference is the entire budget.
Anything with a name in it. Product names, drug names, place names, your CEO. Synthetic voices mispronounce proper nouns confidently and consistently, and the fix is usually phonetic hacking of the input text until it sounds right, which costs more time than a take.
Anything emotional or sensitive. Patient information, bereavement, safety briefings, apologies. Audiences are measurably unforgiving of a synthetic voice delivering news that matters to them, and the cost of getting this wrong is not measured in production budget.
Language variants that are not the big twelve. AI voices are strong in major languages and thin outside them. We cast in over 100 languages with native speakers, and the gap between a synthetic and a native voice widens fast as you move away from the languages the models were trained on hardest. If you are localising into Serbian, Malayalam or Egyptian Arabic, listen to both before you decide — do not assume parity.
The three risks nobody puts in the budget
1. Usage rights on a cloned voice. If you clone a voice actor's voice, you need their informed, written, specific consent — for that use, that territory and that term. A general release signed for a recording session three years ago is very unlikely to cover training a model on it. This is the single most common gap we see in AI voice projects, and it surfaces at the worst moment, which is after the campaign is live.
2. The usage licence has not gone away. A voice over quote has two halves: the recording fee and the usage fee — the right to run that audio in a given medium, territory and period. Internal video, your website and organic social normally carry no usage fee at all. Paid advertising does: as a guide, online and social advertising adds roughly £400–£1,200 and broadcast TV £700–£2,100, both at UK, one year, scaling with territory and term. AI vendors price per character or per minute and say nothing about usage, which reads as cheaper until legal asks who licensed what.
3. Accessibility and compliance. If the audio is audio description, or if it is doing accessibility work under an obligation you have to evidence, check your framework before you choose. Requirements vary by sector and by country, and "it sounded fine" is not an audit response.
What each one actually costs
AI voice over is typically priced per character, per minute or on a monthly subscription. It is cheap enough that cost is rarely the deciding factor — which is why the decision should be made on fit, not on price.
Our rates are published rather than quoted on request, so you can build a comparison today:
- £400 per studio hour for a produced session — the voice actor, the casting, the direction, the studio and the sound engineer included. £1,200 a half day, £2,400 a full day.
- £130 per studio hour if you are bringing your own voice talent and need the room and an engineer. £390 a half day, £780 a full day.
- Usage quoted separately, and only when the audio is published or broadcast.
All exclude VAT. A typical two-minute corporate script is comfortably inside one studio hour.
The honest comparison is not £400 against a subscription. It is £400 against a subscription plus the time your team spends regenerating takes, fixing pronunciations and getting sign-off on a voice nobody is quite happy with. On a short, high-stakes script the human is often cheaper in total hours. On a long, low-stakes one it is not close, and AI wins.
The question that actually decides it
Not "can AI do this?" — it can do most of it. Ask instead:
If this audio is wrong, who notices, and what does it cost us?
Nobody notices a flat read on an internal expenses video. Everybody notices one on a brand film, and the cost is not the re-record.
A 60-second decision
Answer these five. Three or more yesses means book a human.
- Will this be seen by people outside the company?
- Does it need to persuade, reassure or sell, rather than inform?
- Does the script contain product names, people's names or places?
- Will it still be running in twelve months?
- Would a flat or slightly wrong delivery embarrass us?
Three or more noes, and AI is very likely the correct, cheaper, faster answer. Use it.
If you want a second opinion on a specific script, send it over. We will tell you honestly which half of it needs a person — including when the answer is none of it. We record in over 100 languages in our own Central-London studios, with a native director in every session, and an itemised quote normally comes back within four working hours.
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