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Gadfly is a voice tutor for technical interviews. You think out loud; it asks the next question instead of handing you the answer — and it remembers what broke last time.
Free while it is early · a practice room, not an earpiece
ACT I · THE SILENCE
The room scores what it hears.
It heard nothing.
“the feedback primarily boiled down to a very repetitive you need to go deeper”Blind · on a $100 mock with a Google L7
“My brain is straight mush. Concepts blending together, learn 1 new thing, push out another”Blind · thread “Anyone else’s brain fried?”
ACT II · 399 BC · ATHENS
Athens called him the gadfly — small, persistent, impossible to ignore, stinging a drowsy city awake. The city put him to death for it. The method survived twenty-four centuries.
Now the method has a microphone.
/ˈɡad·flʌɪ/ n. a persistent, annoying questioner — one that provokes others into thought.
ACT III · 11:42 PM · TONIGHT
That is the first rule of the room, and it does most of the work: a plan that sounds fine in your head rarely survives being spoken. The gaps come out where an interviewer would find them — before the interviewer does.
Keep scrolling — the session plays as you go ↓
THE BUTTON · TRY IT
Go ahead. Press it.
The answer does not come. The question you were dodging does.
A tutor who caves is a search engine with manners — and you already have one of those.
ACT IV · THE MEMORY
It listens while you think, then names the one thing that went wrong — in your own words, with the minute it was said. Free AI mocks forget you the moment you close the tab. The memory is the product.
Spaced repetition — applied to reasoning instead of vocabulary.
A mistake clears after three clean runs in a row, not one. One good evening is luck; three is a change.
8:00 AM
Not because you filed anything. The wrap-up wrote it when the session closed: which pattern slipped, which drill it spawned, which day it comes back. Session twelve starts where session eleven found the crack.
ACT V · THREE ROUNDS
Not one of them is testing what you know.
ALGORITHMS
You get the answer right, but you think in silence. The room scores what it hears — and it heard nothing.
SYSTEM DESIGN
You can name a cache, a queue, a shard. In the room you draw boxes before you ask what the system must do.
BEHAVIORAL
You tell a real story from your work. They hear “we decided” where they needed “I decided” — and a result with no number in it.
Every screenshot on this page came from a real session. Everything above is in the app today. Nothing here is a plan.
ACT VI · THE ARC
The hours are still yours to put in. What changes is where they go.
TONIGHT
One session in, the wrap-up quotes you saying the thing that broke. It has a name now.
WEEK 1
It is usually not what you thought. Most people guess “I need more problems”. The journal says something narrower — and quotes you saying it.
WEEK 4
Three clean runs in a row and it clears from your plan. Then the next one surfaces, and it is a smaller one.
WEEK 8
By then you have said your reasoning out loud more times than you can count. The interview is one more of those.
No score, no percentage, no “you are 78% ready”. Those are guesses. This is a journal.
ACT VII · WHAT IT COSTS
$0 · no card
Three voice sessions on all three tracks. A session counts from the moment it starts, so an abandoned one still counts — and nothing renews, because there is nothing to cancel.
Voice runs in a small app on your own machine. Install it once; the audio never leaves the computer.
Start the first three$99 · one payment
The length of one real preparation cycle. The plan brings back the problem you broke on, on its own schedule, weeks later — until it stops breaking.
After you grade yourself, a diagnosis names one place you slipped and quotes you saying it. On an even session it stays silent instead of inventing a weakness.
Less than half of one hour with a live engineer.
Start free, then buy$179 · one payment
The same product for twice as long — two cycles instead of one. Long enough to take all three tracks in turn instead of picking one.
Nothing is unlocked by paying more: the only difference between the two paid plans is the end date. $179 is what one hour costs on interviewing.io's own checkout today.
Start free, then buySame product on every plan, including the free one.
An hour with a live engineer starts at $179 on interviewing.io's own checkout and reaches $399 with a named Google interviewer on Prepfully; a packaged block of five with a Meta engineer runs about a thousand dollars. Every one of those hours ends when the hour does, and the next one starts from zero.
The work is still yours. Start tonight.
No card — a microphone and a small voice app to install.