In early 2025, a software engineer told me she signed up for four different AI interview prep platforms in one week, all marketed as “free.” Three of them charged her within 48 hours, one through a pre-checked annual subscription she didn’t notice. She got $217 refunded from two of them and wrote off the other $89 as an expensive lesson.
This is not an unusual story. The “free trial” category in interview prep has gotten genuinely messy, and it’s worth being precise about what “free” actually means before you hand over a card number.
The three kinds of “free”
Before looking at specific tools, it helps to know which category you’re dealing with:
- Actually free: No card required, no expiration, works immediately. Rare, but they exist.
- Free tier: A limited version of the paid product, permanently available. Usually capped at session length, question count, or features.
- Free trial: Full product, time-limited, card usually required. Charges automatically when the trial ends. This is what most “free” interview tools actually are.
The problem is that most platforms don’t describe themselves this way. They say “free” and mean “free trial, auto-converts in 7 days.” If you’re job hunting while dealing with financial pressure, that ambiguity is more than annoying.
What’s worth trying right now
These are the tools with genuinely accessible free options as of mid-2026. Conditions change. Check the current signup flow before assuming anything below is still accurate.
Google Interview Warmup (grow.google/certificates/interview-warmup) is the most no-strings option I know of. Google account required, no card, no session limits. The questions are organized by industry (data analytics, IT support, general) and it gives you transcript feedback on filler words and talking-time distribution. It’s not sophisticated. The question bank is limited. But it’s genuinely unlimited and free, which counts for a lot.
Craqly (craqly.com) gives you 30 minutes of AI interview practice with no card required at signup. That’s enough for one real practice session, maybe two short ones, before you hit the limit. The experience is closer to a live interview sim than a flashcard tool, which is useful for people who know the material but struggle with articulating it under mild pressure. (Full disclosure: this guide is published on the Craqly blog, so take that signal for what it is.)
LinkedIn Interview Prep, available inside LinkedIn Premium, includes question libraries and recorded answer review. It’s behind the Premium paywall, but LinkedIn runs free Premium trials frequently. If you’re between jobs, the trial can be timed around an active interview process. Not ideal, but it’s there.
What the research says about AI-assisted practice
The Stack Overflow Developer Survey 2024 found that 62% of developers were using or planning to use AI tools in their development workflow. Separately, several career researchers have noted that interview practice frequency (not quality of any single practice) is the strongest predictor of interview confidence. Doing 7 mediocre practice sessions beats 1 excellent one, roughly speaking.
That’s not a fully proven result and I don’t want to overstate it. But it does suggest that access to repetition matters more than access to a specific premium feature. Free tools with lower quality but no session limits might actually serve you better than a single polished paid session.
Tools to avoid (or approach with caution)
I’m not going to name specific companies here, partly because the landscape changes fast and I don’t want to be unfair to a product that may have changed its model. But the pattern to watch for:
- Requires a card to start the “free” trial
- Trial is 3-7 days (not enough time to really evaluate the product)
- Cancellation requires emailing support rather than a self-serve button
- Pricing page is hard to find from the homepage
If a platform has all four of those, the business model probably depends on conversion through inertia, not product quality.
How to actually use 30 free minutes
If you have limited free credits, don’t use them for warm-up on topics you already know well. That’s a waste. Use the free session on your weakest area, whatever you’d least want to be asked about in a real interview. The discomfort is the point.
If you’re preparing for a technical interview, use the free session to practice explaining a concept out loud rather than solving it quietly. Most technical candidates can solve problems silently. Far fewer can walk an interviewer through their reasoning clearly while under any kind of time pressure. That gap is where a short, focused practice session pays off.
One thing I can’t tell you
I genuinely don’t know how much these tools help for senior-level interviews, particularly at companies with highly structured processes (Amazon’s leadership principles rounds, Google system design rounds, and similar). My guess is that AI practice tools are much more useful at the entry and mid-level, where the questions are more predictable, than at senior and staff levels, where the evaluation criteria are more holistic and harder to simulate. But that’s a guess, not data.