TLDR Tracy AI Interviewer is the pick when you already have the applicants and need to see which ones know the field. She interviews each one by video, asks follow-ups in the expert's own field, and leaves a recording, a timestamped transcript and integrity signals for a person to review.
Every applicant can interview the day they apply, at any hour, with no scheduling. Pricing is public: $1 per credit, the first 3 results free, no seats. Tracy is not a marketplace and does not take your contracts.
Braintrust AIR is the closest enterprise interview tool. HackerRank, CodeSignal and Karat fit engineering experts. Mercor and micro1 are the better pick when you want vetted people delivered instead of a tool.
We make Tracy AI Interviewer.
A lab project lands on a Monday, and the experts you vetted last quarter do not cover it. The new applicants all list the right degrees, and the few people who can tell which of them know the field are already booked. Expert vetting software interviews applicants before a person spends an hour on any of them. Seven tools are ranked below, each with a case where it is the better pick. Our expert vetting page shows how Tracy runs it from a brief.
What does expert vetting software have to do?
The buyer is usually a head of expert supply, a head of operations or a founder. Five needs follow, and they are the ranking criteria.
- Depth in the field: follow-ups in the expert's own field, not only a test.
- Capacity when a project lands: the interview starts when the applicant clicks.
- Proof that the expert who passed does the work: integrity signals shown to a human reviewer, as evidence and not proof, plus follow-ups that make a rehearsed answer hard to keep up.
- A reason you can show the lab client: each approval links to the expert's own answers and the recording.
- Whose people they are: a tool interviews your applicants, while a network supplies its own and may compete for your contracts.
For question banks by field, see AI trainer interview questions.
How do the seven tools rank, and why in this order?
We ranked on how much of the vetting job, for your own applicants in any expert field, each tool covers, with a published price as the tie-breaker. Tracy is first because she covers depth, capacity, evidence and stack for any field at a public price. She is not first on every line: Braintrust AIR lists more ATS connectors and languages, HackerRank has a coding environment, and Karat puts a human engineer in the interview. Mercor and micro1 are last because they do not vet your own applicants. If you want vetted experts delivered, they move to the top. A tool vets people you already have; a network supplies people it has vetted, and its criteria decide who passes. See how AI interviews work.
Which expert vetting software is the better pick, and when?
Tracy interviews each applicant by two-way video. After every answer she asks about what was said, in the expert's own field, and waits for them to finish. You describe the project or bring your own questions, and with the CV check on she can read the CV first. A director at an accelerator residency programme said Tracy "sometimes brings up exactly those questions I might have forgotten to ask, which has been a pleasant surprise." The product page shows the flow.
A reviewer gets a recording, a timestamped transcript, a written assessment per question and integrity signals with their evidence: tab changes, gaze, face detection, delay before answers, fullscreen exits and external screens. The signals go to a human reviewer to interpret, are not proof of anything, and the team decides. We give no detection rate. Every expert's evidence sits in one place and one shape, which makes a large pool reviewable (how reports read). One customer cut its average time to hire from 44 days to 7, and Tracy did the work of 53 full-time recruiters in one month. Tracy has completed 600K+ interviews for 300+ clients, with 99% interview completion.
Pricing is $1 per credit, one credit per started 20 minutes, the first 3 results free, no seats and no upfront cost (pricing). Choose another tool when you need a supply of experts, a proctored coding library, or native ATS connectors: Tracy does not supply experts, and her public Connect page describes no ATS write-back.
Signals arrive with timestamps for a person to review, and none of them is a verdict.
2. Braintrust AIR: enterprise voice screening that syncs to your ATS
Braintrust says AIR runs the screen, scores answers against a role-specific rubric and sends a ranked evidence pack to humans and the ATS. Follow-ups adapt to each answer, interviews run in 16+ languages, and it lists native Greenhouse, Lever, Workday, iCIMS and SmartRecruiters integrations. Pricing is volume-based with scoped pilots. Pick it for multilingual voice screening in an enterprise ATS team.
3. HackerRank: the engineering pick with a coding environment
HackerRank's Chakra interviewer opens a live canvas with a real-world problem, asks follow-ups on the work, and flags unauthorized apps. Starter is $79 a month ($948 billed annually) with 60 candidate attempts a year, then $20 per extra attempt. Pick it for software engineers who need a coding environment (AI technical interviews); a physician or lawyer is outside what it describes.
4. CodeSignal: validated assessments plus a short AI interview
CodeSignal starts at $79 a month billed annually, with $20 per extra credit. Its AI interviewer probes thin answers in about 15 minutes, and it lists a Suspicion Score and AI proctoring. Pick it for assessments validated by I/O psychologists alongside a short interview.
5. Karat: human engineers on demand
Karat sells interviews run by human Interview Engineers, available same day and around the clock, with a report of a recommendation, a score and feedback per question. It shows no price. Pick it when you want a human engineer in the room and will pay a quoted price.
6. Mercor: vetted people delivered
Mercor says it has 5M+ experts and sells human evaluation to frontier labs. It shows no buyer price and names no interview tool for your own applicants. Pick it when you want vetted experts supplied.
7. micro1: a data lab with its own AI recruiter
micro1 describes expert human data and evaluations. Every expert applicant has an on-demand interview with its AI recruiter, Zara, against its certification criteria. The interview is not offered as software to buy. Pick it when you want micro1's expert supply.
How do the seven tools compare on depth, volume, stack and evidence?
| Tool | Depth | Volume | Stack | Evidence | Price |
|---|---|---|---|---|---|
| 1. Tracy AI Interviewer | Two-way video, follow-ups in the expert's field | Starts on click, any hour, no scheduling | API, MCP, Slack, WhatsApp, Zapier, Power Automate | Recording, transcript, assessment per question, integrity signals | $1 per credit, first 3 results free |
| 2. Braintrust AIR | Adaptive follow-ups, voice | Interviews on the candidate's schedule | Greenhouse, Lever, Workday, iCIMS, SmartRecruiters; 16+ languages | Ranked evidence pack; session-integrity signals | Volume-based, no public price |
| 3. HackerRank | Chakra follow-ups on work in a live canvas | 60 attempts a year on Starter | ATS and calendar on Pro; API and MCP on Enterprise | Score per competency with a reason; flags unauthorized apps | From $79 a month ($948 annual); $20 per extra attempt |
| 4. CodeSignal | AI interviewer probes thin answers; about 15 minutes | AI phone screens without waiting for a live call | Gem, Ashby; Workday, iCIMS, Oracle on enterprise | Score report; Suspicion Score, AI proctoring | From $79 a month annual; $20 per extra credit |
| 5. Karat | Human Interview Engineers with a rubric | On demand, same day, evenings and weekends | Not stated | Recommendation, score, written feedback per question | No price shown; request a demo |
| 6. Mercor | AI assessments for expert applicants | 5M+ experts (vendor figure) | Not stated | Not stated | No public price |
| 7. micro1 | Conversational interview with Zara; coding challenge for technical roles | On demand | Not stated | Result against its certification criteria | Not stated |
What do the five needs leave out?
Rival facts: vendors' own pages, read 9 Nov 2026. Tracy: approved product records. "Not verified" means we have not checked, not that it is absent.
| Criterion | What we verified | Where a rival leads |
|---|---|---|
| Implementation and service | Tracy Enterprise: a dedicated customer manager, a dedicated support channel, a setup customised to your workflow, a team walkthrough, customised in days. | Tracy for a tool set up in days; Karat for a human in the room. |
| Multilingual | Braintrust AIR lists interviews in 16+ languages. | Braintrust AIR, on published languages. |
| Security and compliance | Tracy is SOC 2 Type II attested, with the report on request. The rest: not verified here. | Tracy, on what we verified. |
| ATS integration depth | Braintrust AIR lists native Greenhouse, Lever, Workday, iCIMS and SmartRecruiters connectors. CodeSignal lists Gem and Ashby. | Braintrust AIR. |
| Support | Tracy Enterprise has a dedicated support channel and a dedicated customer manager. The rest: not verified. | Tracy, on what we verified. |
Every expert applicant gets the same follow-up interview and one report, in one place, and volume scales because interviews start on click.
How do you run a one-week bake-off?
Rank tools on your own experts, because a demo shows the vendor's best case. In one week:
- Pick one field where you can judge answers, and one owner who reads every result.
- Invite ten people to each tool with the same brief: five experts you trust and five you have not met.
- Decide the stop condition first: drop a tool that cannot separate the trusted five from the rest.
- Score follow-up depth, whether a reviewer could decide from the recording in minutes, whether integrity evidence came with timestamps, hours from invite to result, and cost at your volume.
On Tracy, 100 interviews of 20 minutes cost $100, with the first 3 results free (see pricing), and you can invite and read results in ChatGPT or Claude through the Connect page.
How we chose these tools
We looked for what a head of expert supply needs: depth in the field, capacity when a project lands, evidence a reviewer can check, a stack that fits and a price you can read. "Not stated" in the table means the vendor does not say. Prices are as the vendors display them, in different units. Which path fits you: expert vetting for your own applicants in any field, technical interviews for engineers, volume hiring when thousands apply, customer research for interview panels beyond hiring. For a wider list, see the best AI interview software guide.
Questions
What is expert vetting software?
Can AI vet experts in niche fields?
How do we know the expert who passed is the one who does the work?
Can you show a lab client why each expert was approved?
How much does expert vetting software cost?
Send us one expert brief and we build the interview plan, customised in days, with a recording and report you can check. Book a demo · Try it free
Sources
- Tracy AI Interviewer, Pricing, retrieved 9 Nov 2026.
- Tracy AI Interviewer, Expert vetting, retrieved 9 Nov 2026.
- Tracy AI Interviewer, Connect, retrieved 9 Nov 2026.