AI coding interview assistant for live coding rounds
Coding rounds are where most candidates freeze: a problem you have seen before looks different under a timer with someone watching. LastRound AI reads the problem straight from your screen and gives you the approach, complete code in the editor's language, its complexity and the edge cases, plus a line you can say out loud.
From desktop 5.0 there is no coding mode to switch to. Capture the screen and press Answer in the same session that hears the interviewer, so it works in silent rounds and take-homes as well as in a pair-programming call.
Summarized question: Return the indices of the two numbers in nums that add up to target.
Approach: one pass with a hash map. O(n) time, O(n) space.
For each number, check whether target minus it was already seen.
def two_sum(nums, target):
seen = {}
for i, n in enumerate(nums):
if target - n in seen:
return [seen[target - n], i]
seen[n] = i61interview languages
~1 sto the first words of an answer
Hiddenon screen share and recordings
1 creditper minute, free plan included
How it works
Four steps, all on the keyboard
- 1
Press Start
Or just capture the problem: the first Capture or Answer starts the session. There is no round type or language to pick first.
- 2
Capture the problem
Press ⌘/Ctrl + H with the problem on screen. The app captures the display your mouse pointer is on. Long problems can take several captures, including the examples and constraints. The badge on Capture counts them.
- 3
Get the answer
Press ⌘/Ctrl + Enter. After a few seconds of working it out, you get the approach, complete code in the language selected in the editor, time and space complexity, edge cases and a line to say aloud.
- 4
Not right? One click
Under the answer: Regenerate answers again and checks for mistakes, Another approach gives a different solution, Explain simpler adds a plain-words walk-through under the code.
What you get
Built for this round
Complete, runnable code
The whole solution in the editor's language, keeping the starter code's function signature, for LeetCode, HackerRank, Codility or CodeSignal problems, SQL, and files such as Terraform, YAML or a Dockerfile.
Another approach on demand
One click gives a genuinely different solution with a line on how it compares, so you can talk through the trade-off before you commit.
Edge cases before they ask
Every coding answer names the edge cases the code handles, ready for the moment the interviewer asks whether you are done.
Words, not just code
Each answer ends with a line to say aloud, and Explain simpler walks through the code in plain words under it.
Follow-ups build on the code
Listening keeps running while you work on the screen, so a spoken follow-up such as "can you optimise it?" or "why a hash map?" builds on the code shown. Asking out loud for code, like "write it without recursion", gets complete code too.
Hidden on screen share
The overlay is excluded from screen sharing and screen recording, so the interviewer sees your editor, not the assistant.
Watch the full walkthrough
The desktop app from setup to a streamed answer.
Before the interview
Set a preferred coding language
Optional. ⋮ → Interview Setup holds a preferred coding language, used only when the screen shows no language. Otherwise the code follows the editor.
Learn the shortcuts first
Answer with ⌘/Ctrl + Enter, capture the screen with ⌘/Ctrl + H and hide or show the overlay with ⌘/Ctrl + B. The shortcuts work while your meeting, browser or editor has focus.
Practise on a real problem
Run a short session on any LeetCode-style problem before the interview so the flow is familiar.
Where to be careful
- Your mouse pointer is shared even though the overlay is not. Clicking the overlay moves focus away from the editor, which some coding platforms record. Use the keyboard shortcuts.
- Proctored coding platforms differ, and some prohibit outside tools. Check the rules of the round you are taking.
AI Coding Interview Assistant: FAQ
Does the coding interview assistant need to hear the interviewer?
No. A captured problem is answered from the screen alone, so it works in silent rounds. From desktop 5.0 the same session also answers spoken questions, so there is nothing to switch when the interviewer starts talking.
Which programming languages does it support?
The code is written in the language selected in the editor on screen, including SQL and infrastructure files such as Terraform, YAML and Dockerfiles. If the screen shows none, it uses your preferred coding language from Interview Setup: Python, JavaScript, TypeScript, Java, C++, C#, Go, Rust, Swift, Kotlin or Other.
Can I get hints instead of the full solution?
Yes. Capture the problem and type what you want in Ask, for example "give me a hint only" or "list the edge cases", and you get exactly that. Explain simpler and Another approach are one click under each answer. None of it restarts the session or costs extra credits. (Versions before 5.0 have an AI Styles panel with Hints, Approach, Edge Cases, Explain and Communicate.)
How much does it cost?
Sessions bill 1 credit per minute, rounded up, from Start to End. Every account gets 15 free credits a month, so you can try it on a practice round before paying. Paid plans add more credits each month.
Other interview types
- System design interviewsStructured answers to design questions, grounded in your experience
- Behavioral interviewsSTAR answers built from your own stories and numbers
- Phone screen interviewsHelp on recruiter screens, on your laptop or your phone
- Online assessmentsMultiple choice, code output and puzzles from a screenshot
- HireVue and one-way videoPrompts read from audio or screen during recorded interviews
Learn more
Try it on a practice round first
Download the app, run a practice session with your free credits, and see the answers for yourself before the real one.