Use chat as the default AI interview and offer voice as an equal option: chat is the cheaper and lower-pressure format, voice is better where speaking is part of the job, where typing is a barrier or where candidates simply prefer to talk. What matters for acceptance is less the channel than three things: candidates know in advance, they can choose, and a person can be reached. This guide shows how to decide, what it costs and where the evidence stops, as of November 2026.
Many teams ask whether candidates will "accept" a voice interview with an AI at all. The honest answer is that acceptance depends on the audience. In our conversations with recruiting teams, doubt about a synthetic voice comes up most for trades, apprentices and care roles, which is why chat is usually the default and voice stays optional. That is an observation, not a measured rate.
Chat vs. voice: the differences that matter
| Chat interview | Voice interview | |
|---|---|---|
| Candidate effort | Typing on a phone; can be done anywhere, quietly, at any time | Needs a place where one can speak; no typing |
| Pressure | Lower; time to think and edit | Higher; answers happen live, but many find it more natural than a form |
| Best for | Facts, availability, location, knockout criteria, short pre-screens | Roles where speaking is the job, language checks, candidates who write little or with difficulty |
| Accessibility | Works for people who are deaf or hard of hearing; harder with dyslexia or limited typing | Works for low typing skill; excludes people who are deaf, hard of hearing or have a speech impairment |
| Language handling | Text is easier to translate and check | Needs good speech recognition for accents and vocabulary; test with your real applicants |
| What you get | Written answers, structured notes | Audio, transcript, structured notes |
| Cost in Sprad (as of 29 Oct 2026) | 10 credits per interview; included in the per-application flat rate | 30 credits per interview (about €3.00 at the €0.10 list price); on the per-application flat rate, voice for every fifth application adds €0.20 per application |
Own assessment, as of November 2026. Prices from the Sprad pricing page; Sprad sells both formats and is therefore not neutral. Other vendors price differently.
What the evidence says about acceptance
A field experiment with about 70,900 applications for entry-level customer-service jobs in the Philippines tested voice AI interviews: applicants were randomly assigned to a human recruiter, an AI voice interviewer or a free choice between them. When they could choose, 78 % picked the AI interviewer, and offer rates were higher with the AI (8.7 % vs. 9.7 %), with humans making every hiring decision (Jabarian and Henkel, SSRN 5395709, working paper, version of 26 January 2026).
Two limits apply. The study covers one type of high-volume job in one country, and it compares voice AI with a human, not with chat. It does not show that voice beats chat. What it does show is that offering a choice and keeping humans in the decision can make an AI interview acceptable. For the wider picture of what builds or loses trust, see what candidates actually think about AI interviews.
A decision rule: chat, voice, or both
- Is speaking part of the job? (call centre, customer service, sales development) Offer voice, as the spoken answer is itself evidence.
- Do many applicants find typing hard, or are the questions about spoken language? Offer voice.
- Is the audience new to AI interviews or sceptical, such as trades, apprentices or care roles? Start with chat, make voice optional, and name a human contact.
- Only facts are missing (start date, licence, shifts)? Chat or a short form is enough; no voice needed.
- Whatever you pick: tell people before they open the link, say how long it takes and what happens with the answers, and give an equal route (chat, voice or a call with a person) that does not lower their chances.
Making either format acceptable
- Disclose early. Say in the invitation that an AI asks the questions and who reads the result. The AI Act's transparency rules for AI systems that talk to people (Art. 50 of Regulation (EU) 2024/1689, applying since 2 August 2026) point the same way.
- Keep it short. Ask only what the role needs. A long interview raises drop-out in either channel.
- Give something back. Preparation information, a clear next step, a timeline. Silence afterwards destroys the goodwill that a good experience built.
- Use the candidate's language and test accents and vocabulary before launch; Sprad offers interviews in 12 languages, and any tool should be tested with your real applicants.
- Keep a human in the decision (GDPR Art. 22). The AI prepares a summary; a person decides.
For choosing between voice, one-way video and phone, see one-way video interview vs. AI phone screen; for which roles suit AI interviews at all, which roles fit an AI interview.
Frequently asked questions
Do candidates prefer chat or voice interviews?
There is no universal answer. In the largest public field study, applicants who had a choice preferred a voice AI interviewer to a human one; no public study compares chat and voice directly. Offer both where you can and measure which one your applicants finish.
Is a chat interview cheaper than a voice interview?
Usually, yes. In Sprad, chat costs 10 credits and voice 30 per interview (as of 29 October 2026), and chat is included in the per-application flat rate.
Which format is more accessible?
Neither is, for everyone. Chat suits people who are deaf or hard of hearing; voice suits people with low typing skill. That is why an equal alternative matters more than the choice of default.
Should voice be mandatory?
No. Make it optional unless speaking is a real job requirement, and then say so in the job ad.
Does a voice interview work in German?
It can, if you test it with real German speakers, regional accents and your job vocabulary. A language label on a vendor page is not proof of good comprehension.
What do candidates need to know before an AI interview?
That AI asks the questions, how long it takes, what is recorded, who sees it and how to reach a person.
Jürgen Ulbrich
Jürgen Ulbrich has more than a decade of experience in developing and leading high-performing teams and companies. As an expert in employee referral programs as well as feedback and performance processes, Jürgen has helped over 100 organizations optimize their talent acquisition and development strategies.
