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Greenroom vs Prepfully: up to 30 mocks a month vs paid expert mocks

Prepfully books you a mock interview with a real, vetted interviewer from a top company — high fidelity, high cost, scheduled in advance. Greenroom gives you up to 30 AI voice mocks a month that read your GitHub and are available the moment you need them. These aren't really rivals; they're different points on the same prep journey.

TL;DR Use Prepfully for an occasional high-fidelity reality check with a real expert from your target company. Use Greenroom for the daily reps in between — up to 30 a month, instant, personalized to your projects, and a fraction of the cost. The smart play is both: Greenroom to build the skill, Prepfully to pressure-test it.

The short version

Prepfully is a marketplace of real interviewers and coaches — many currently at or recently from companies like Google, Meta and Amazon. You book a slot, do a live mock, and get human feedback (and sometimes resume reviews or referrals). It's the closest thing to the real interview short of the real interview. The trade-offs are price (expert mocks typically run well over $100 each), scheduling, and the fact that you can't realistically do one every day.

Greenroom is an AI voice interviewer. Ari reads your GitHub before each session and asks about your actual code, runs technical, system design and behavioral rounds by voice, and gives specific feedback every time. It's instant, up to 30 sessions a month on paid plans, personalized, and starts free. It won't give you a referral or an insider's read on one specific company's bar — but it will give you the volume of reps that actually builds the skill.

Feature comparison

What matters	Greenroom	Prepfully
Interviewer	Consistent AI (Ari)	Real expert from a top company
Cost per session	Free tier; cents on paid plans	Typically $100+
Availability	Instant, 24/7	Booked in advance
Volume of reps	Up to 30/mo	Occasional
Personalized to your GitHub	Yes	Depends on the expert
Insider, company-specific read	No	Yes
Referrals / networking	No	Sometimes
Feedback	Automated, every session	Human, detailed
Voice conversation	Yes	Yes

Where Prepfully wins

Nothing replaces a real human who interviews at your target company. Prepfully gives you an insider's read on a specific company's bar, genuinely high-fidelity pressure, and sometimes networking or referral value. Before a final round at a dream company, one or two Prepfully sessions can be worth every rupee or dollar — the feedback is human, nuanced, and specific in a way automated feedback isn't.

Where Greenroom wins

But you can't build a skill on one or two expensive sessions. The freeze response, the rambling, the inability to explain your own architecture — those only fade with volume, and volume is where paid human mocks become impractical. Greenroom fills exactly that gap:

Reps without the bill. Practice every day instead of once a fortnight. The cost of a single expert mock buys you months of Greenroom.
No scheduling, no waiting. Run a session at midnight before a morning interview. No booking, no timezone math.
Personalized to your work. Every question comes from your real repos, so each rep rehearses the stories you'll actually tell.
Consistent and always ready. No no-shows, no variance in interviewer mood — just steady, available practice.

So which should you use?

Use Greenroom as your daily training and Prepfully for occasional reality checks — especially before a final round at a specific company. Build the skill cheaply and constantly with Greenroom; validate it with a human when the stakes are high. Greenroom's free tier costs nothing to start, so you can begin the daily reps today.

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Frequently asked questions

What's the difference between Greenroom and Prepfully?

Prepfully books you a paid, scheduled mock with a real expert from a top company. Greenroom gives you up to 30 instant AI voice mocks a month that read your GitHub. Prepfully is higher fidelity per session; Greenroom is built for volume and personalization at a fraction of the cost.

Is Greenroom cheaper than Prepfully?

Substantially. Expert human mocks typically cost over $100 each. Greenroom has a free tier and paid plans from $10/month for many sessions, so the cost per rep is a tiny fraction.

Can Greenroom replace a human mock interview?

For daily practice and building the skill, yes. For an insider read on one specific company's bar or for networking, a human mock like Prepfully still adds value. Most candidates use Greenroom for volume and a human mock for the occasional reality check.

Which should I use before a final round?

Both. Use Greenroom to rehearse repeatedly in the weeks before, then book one Prepfully session close to the date for a high-fidelity check from a real expert.

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