Skills tests or an AI interview: do you need both?

Where a skills test genuinely wins, and we mean that

Concede this plainly, because it is true and it matters. If a job needs someone to write working code, a coding test settles it better than any interview will, ours included, and it settles it the same way for every candidate. HackerRank's library alone covers 77 roles and 260+ skills across 40+ languages; Codility runs candidates in a real VS Code environment rather than a toy browser box. Neither of those is something a conversation can replicate.

This is also the most honestly priced part of the market. TestGorilla runs a genuine $0/month free plan with no card required, Alooba publishes exact dollar figures for every tier on its pricing page, and both let a team start without a sales call. That transparency is a real advantage, and where it exists, it is worth using as leverage in any vendor conversation.

So the starting position on this page is not that a test is inferior to an interview. For the specific job of proving a discrete, gradable skill exists, it is usually the better tool, and this is the one page in this cluster where we say that without hedging.

The layer that mostly skipped frontline hiring

The uncomfortable finding in researching all nine major skills-testing platforms is how little of the category was built for the roles that make up most of the world's actual hiring. Only 2 of the 9, Mercer Mettl and Xobin, have a dedicated, named product line for non-desk work: Mettl runs a purpose-built blue-collar test line including a dark-personality-trait screen for safety-sensitive roles, and Xobin has named test pages for warehouse supervisor, warehouse worker and warehouse associate roles.

A further 3, TestGorilla, iMocha and Vervoe, have some frontline-adjacent content, but it is a small minority of a much larger library. TestGorilla's own test-library page shows roles like retail sales, front desk receptionist and health care aide sitting alongside 83 programming tests, an estimated 5 to 10 percent of the total. Vervoe's assessment library turned up exactly 2 clearly non-desk tests, teacher and personal care assistant, against a library dominated by software, finance and marketing roles.

The remaining 4, Alooba, HackerRank, Codility and CodeSignal, show no evidence of frontline coverage at all. Where these platforms have expanded beyond their original scope, the expansion has gone toward more office roles (Alooba's 2025 move into sales, marketing and strategy; Codility's and CodeSignal's business-role bolt-ons), not toward the frontline. That pattern is the whole argument for this page: the layer got very good at testing skills that fit in a browser tab, and mostly stayed silent on the skills that do not.

What neither side publishes

Two gaps are worth naming plainly rather than papering over.

First, completion and drop-off data. No vendor among the 9 researched publishes a specific completion or abandonment rate for its timed tests, despite several running active resources and reports sections. TestGorilla's help content, found secondhand, recommends keeping a full assessment under 60 minutes and warns that any single test over roughly 10 minutes risks candidate fatigue, but that is guidance, not a published number. Any claim about test completion rates you encounter elsewhere is not sourced to a vendor.

Second, pricing. Alooba and TestGorilla publish real figures. Vervoe, iMocha and Mercer Mettl publish none at all, routing every path to a phone call or a demo request. That split is worth noticing when comparing total cost, because a platform's willingness to show you a number before a sales call is itself a signal about who it is built to sell to.

How the two actually fit together

The practical design most teams land on, once you stop treating this as a single purchase, is a gate followed by a conversation.

Where the role has a genuinely gradable hard skill, run the test first. It is cheap per candidate, unsupervised, and settles the hard-skill question decisively before anyone's time is spent on a call. Where the role does not reduce to a task, most frontline and service work, an interview is doing the entire job, because there is no test to gate on in the first place.

For a role that has both dimensions, a developer who also needs to communicate clearly with a non-technical team, for instance, running both in sequence is the honest design: the test proves the code works, the interview finds out whether the person can explain it. Buying one to replace the other, in either direction, is the mistake this page exists to head off.

What Ployo is, and is not, in this comparison

To be direct about where we sit: Ployo is a live AI video interview. The candidate is on camera and speaks; the interview adapts to what they actually say and generates follow-ups from their answers, not from a fixed script. What comes back is a per-requirement verdict with the candidate's own words quoted as evidence, plus the full recording and transcript, so a hiring manager can check the reasoning rather than trust a score.

What we do not do is test code, run a timed task, or claim to replace a skills test where a skill is genuinely testable. If your open role is a software engineering position and the bottleneck is verifying coding ability, a platform like HackerRank or Codility is the better and more direct purchase. Ployo's place in your funnel is the conversation either before or after that gate, for the roles, and the parts of every role, that a test was never going to reach.