StealthCoder

Best Invisible Coding Assistants for Job Interviews (2025 Review)

2025-09-10

In 2025, software engineers face a brutal job market. Competition is high, interviews are stressful, and candidates are looking for every edge they can get. One new category of tools is getting a lot of attention: invisible coding assistants.

These are AI-powered apps that provide solutions, explanations, and system design help in real time — all without being visible to the interviewer. But which invisible coding assistants actually work, and which are just hype?

Let’s break it down.

What Makes a Coding Assistant “Invisible”

For a tool to qualify as invisible, it needs to:

  • Stay hidden during screen sharing on Zoom, Teams, Google Meet, and Chime.
  • Leave no trace in video recordings.
  • Work seamlessly without needing risky hacks or workarounds.
  • Provide instant, accurate answers that the candidate can use naturally.

With those criteria in mind, here are the top invisible coding assistants in 2025.

1) StealthCoder

Overview:

StealthCoder is a purpose-built invisible assistant created by a FAANG engineer. It uses a hotkey to capture the problem on your screen and shows a solution overlay that only you can see. It covers both coding and system design interviews.

Pros:

  • Invisible by default on Zoom, Teams, Google Meet, CoderPad, HackerRank, and more.
  • Works on Windows, Mac, and Linux.
  • Affordable pricing ($15/month billed annually or $40 month-to-month).
  • Local-first processing for privacy.
  • Includes StealthDesign for system design interview help.

Cons:

  • Still requires you to explain answers clearly in your own words.

👉 Try StealthCoder here

2) InterviewCoder

Overview:

One of the first invisible interview assistants to gain traction. It helps with LeetCode-style problems and generates solutions in a floating window.

Pros:

  • Good for coding problems.
  • Supports multiple languages.
  • Has a free tier.

Cons:

  • No system design support.
  • Requires certain Zoom settings to remain hidden.
  • Does not work well on Amazon Chime or newer MacOS versions.
  • Higher price ($25/month billed annually or $60 month-to-month).

3) ChatGPT (with GPT-4 or GPT-o1)

Overview:

ChatGPT is not invisible, but it is often used as a coding assistant during prep.

Pros:

  • Flexible, handles coding, algorithms, and system design.
  • Can generate explanations and step-by-step reasoning.

Cons:

  • Requires copying and pasting between tabs.
  • Visible if used during screen share.
  • Not built for stealth.

4) GitHub Copilot

Overview:

An IDE-based autocomplete tool that helps you code faster.

Pros:

  • Great for practice and everyday development.
  • Fast and intuitive suggestions.

Cons:

  • Visible to anyone watching your screen.
  • Not designed for interviews or stealth.

5) Codeium

Overview:

A free alternative to Copilot, also IDE-based.

Pros:

  • Free to use.
  • Solid autocomplete support.

Cons:

  • Same limitations as Copilot: not invisible, not interview-focused.

Final Verdict

If you are looking for the best invisible coding assistant in 2025, there is really only one clear choice: StealthCoder.

It covers both coding and system design, works invisibly across platforms, supports all major operating systems, and protects your privacy with local-first processing. InterviewCoder is still around, but it is more limited, less reliable, and more expensive. ChatGPT, Copilot, and Codeium are excellent for practice but not invisible during live interviews.

👉 Start your free trial of StealthCoder today: https://stealthcoder.app

Keywords: invisible coding assistant, undetectable AI interview tools, StealthCoder vs InterviewCoder, AI for coding interviews, system design interview help.