Is Stealth Interview a good StealthCoder alternative?

Yes, if you want to know what is answering. They are the closest match in this category: both are native desktop apps for macOS and Windows that read the problem off your screen rather than injecting anything into the page. Stealth Interview also transcribes the interviewer's audio as context and publishes exactly which AI models each plan includes; StealthCoder's FAQ says it does not publish provider or model names.

StealthCoder, on its published amounts. Its home page shows $15 a month billed annually at $180 a year, or $40 a month month-to-month, read in August 2026. Stealth Interview is $49 a month, $150 for six months or $250 for a year.

Does either one handle system design?

Both say they do. Stealth Interview returns a written approach with a Mermaid architecture diagram. StealthCoder's FAQ says it analyses architecture diagrams and suggests scalability patterns.

Which coding platforms does Stealth Interview cover?

CoderPad, HackerRank, CodeSignal and LeetCode, alongside Zoom, Google Meet, Microsoft Teams and Webex.

StealthCoder Alternative: Know What's Answering

StealthCoder's own FAQ (August 2026) says it doesn't publish which AI models it uses. On a hard question, that's the one thing you'd want to know. Stealth Interview names every model on every plan.

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Rec00:23:52Technical interview · 45 min

{}PYsolution.pyREADME.mdRunShared editor · Python 3

# Write your code here

def length_of_longest_substring(s: str) -> int:

last_seen = {}

left = best = 0

for right, ch in enumerate(s):

if ch in last_seen and last_seen[ch] >= left:

left = last_seen[ch] + 1

Test casesConsoleRun your code to see the output.

Case 1Case 2Case 3

Inputs = "abcabcbb"

Expected3

Problem

Longest substring without repeats

Medium

Given a string s, return the length of the longest contiguous substring in which every character is unique.

Example

in s = "abcabcbb"

out 3 ("abc")

Constraints

0 ≤ len(s) ≤ 50,000
s may contain letters, digits, symbols and spaces.

Hint 1Hint 2Topics

Auto-saved

DWARConnected · 2 participantsLn 1, Col 1Spaces: 4UTF-8Python 3

You are sharing your screenStop sharing

Dana Whitfield· Interviewer

You

Participants2Chat

DWDana WhitfieldInterviewer

ARYouSharing screen

RecThis meeting is being recorded.

Message everyone

MuteStop videoShare2ParticipantsChatReactionsLeave

Rec00:23:52

Dana

You

You are sharing your screenStop sharing

PYsolution.pyRun

Longest substring without repeatsMedium

# Write your code here

def length_of_longest_substring(s: str) -> int:

last_seen = {}

left = best = 0

for right, ch in enumerate(s):

if ch in last_seen and last_seen[ch] >= left:

left = last_seen[ch] + 1

2Leave

90%Subscription

python

Please analyze this context and help me answer the question or solve the problem.

Transcript

"Okay, next one. Given a string, return the length of the longest substring that has no repeating characters. Walk me through your approach before you code it."

Technical interview · 45 minsolution.pyShared editor · Python 3Longest substring without repeatsMediumGiven a string s, return the length of the longest contiguous substring in which every character is unique.s = "abcabcbb"
→ 31def length_of_longest_substring(s: str) -> int:2 last_seen = {}3 left = best = 04 for right, ch in enumerate(s):5 if ch in last_seen and last_seen[ch] >= left:

python

def length_of_longest_substring(s: str) -> int:    last_seen = {}                    # char -> index    left = best = 0    for right, ch in enumerate(s):        if ch in last_seen and last_seen[ch] >= left:            left = last_seen[ch] + 1  # jump past it        last_seen[ch] = right        best = max(best, right - left + 1)    return best    last_seen = {}                    # char -> index

Approach

At each index r, the window's left edge is:

left r = max (left r -1, last[s r] + 1)

Time O(n): each character enters and leaves the window once.
Space O(min(n, k)): k is the size of the character set.

Type your message...

GPT-6.1 Terra

Transcribing...

90%Subscription

python

Please analyze this context and help me answer the question or solve the problem.

Transcript

"Okay, next one. Given a string, return the length of the longest substring that has no repeating characters. Walk me through your approach before you code it."

python

def length_of_longest_substring(s: str) -> int:    last_seen = {}                    # char -> index    left = best = 0    for right, ch in enumerate(s):        if ch in last_seen and last_seen[ch] >= left:            left = last_seen[ch] + 1  # jump past it        last_seen[ch] = right        best = max(best, right - left + 1)    return best    last_seen = {}                    # char -> index

Approach

At each index r, the window's left edge is:

left r = max (left r -1, last[s r] + 1)

Time O(n): each character enters and leaves the window once.
Space O(min(n, k)): k is the size of the character set.

Type your message...

GPT-6.1 TerraClear chat

Transcribing...

QuitEscHide+QCapture+PCrop+OSubmit+EnterPress to get answerLeft/Right+Up/Down+

90%Subscription

python

Please analyze this context and help me answer the question or solve the problem.

Transcript

"Okay, next one. Given a string, return the length of the longest substring that has no repeating characters. Walk me through your approach before you code it."

python

def length_of_longest_substring(s: str) -> int:    last_seen = {}                    # char -> index    left = best = 0    for right, ch in enumerate(s):        if ch in last_seen and last_seen[ch] >= left:            left = last_seen[ch] + 1  # jump past it        last_seen[ch] = right        best = max(best, right - left + 1)    return best    last_seen = {}                    # char -> index

Approach

At each index r, the window's left edge is:

left r = max (left r -1, last[s r] + 1)

Time O(n): each character enters and leaves the window once.
Space O(min(n, k)): k is the size of the character set.

Type your message...

GPT-6.1 TerraClear chat

Transcribing...

Primary display

QuitEscHide+QCapture+PCrop+OSubmit+EnterPress to get answerLeft/Right+Up/Down+

Works with

Zoom
Meet
Teams
Webex
CoderPad
HackerRank
CodeSignal
LeetCode

Reviewed August 2026

The row that decides itWhich models you get

Stealth Interview: Published per plan: GPT-6 Luna and GPT-6.1 Terra on Starter; GPT-6.1 Sol, GPT-6 Astra, Claude Sonnet 5.5 and Claude Opus 5.5 on Premium and Hunter
StealthCoder: “We do not publish provider or model names” — its own FAQ, August 2026

Stealth Interview compared with StealthCoder across 9 capabilities.
Capability	Stealth InterviewLive technical interview copilot	StealthCoderCoding-interview copilot
Native desktop appA macOS and Windows application, not a browser tab.	macOS and Windows	Mac and Windows
Built for the live roundAnswers during the interview itself, not a practice session after it.	Yes	Yes
Reads the problem off your screenCapture the question where it appears and get a working solution back.	Yes	Yes
Full explanation and complexityEvery solution arrives with the reasoning and its time and space cost.	Yes	Not stated
System design and OODArchitecture answers with a diagram, not only algorithm problems.	Yes	Yes
Live interviewer audioWhat is asked out loud is transcribed and used as context for the answer.	Yes	Not stated
Named assessment platformsThe tools interviewers actually run problems in.	CoderPad, HackerRank, CodeSignal, LeetCode	LeetCode, CoderPad, HackerRank, CodeSignal
Choose your modelPick the engine per question instead of taking one fixed model.	6 models across the plans	Not stated
Published priceWhat the vendor's own pricing page showed when it was read.	$49 / month · $150 / 6 months · $250 / year	$15 / month annual · $40 / month

NoteWe filled in their column from their own website, so “Not stated” means we could not find it — not that it is missing. Prices and features change, so check theirs before you buy. Last reviewed August 2026. Sources: stealthcoder.app.

What StealthCoder actually is

StealthCoder's home page (August 2026) describes an invisible AI coding-interview assistant that reads the question off your screen, solves it and returns the code, the explanation and the complexity.

StealthCoder is a coding-interview assistant with a scope close to our own. Its home page (August 2026) states plainly that it is “A real desktop app. No browser extension, no localhost server,” shipping for Mac on both Intel and Apple Silicon, and for Windows.

The same page names Zoom, Google Meet and Teams on the meeting side, and LeetCode, CoderPad, HackerRank and CodeSignal on the assessment side. It says the tool covers system design as well as algorithm questions, and that it can analyse architecture diagrams and suggest scalability patterns.

On models it is explicit that it will not say: “We do not publish provider or model names.” The page states only that it runs on state-of-the-art models and updates them as better ones become available.

Everything about StealthCoder on this page was read on its own site (opens in a new tab) in August 2026. Where its pages are silent we say so; we don't test rivals' software or guess what it does.

Where it costs you in the round

Its FAQ says it outright: “We do not publish provider or model names.” You cannot pick a plan by its model, and you cannot know whether a hard question went to a frontier model or a cheap one.
The free trial takes a card and renews at $40 a month, per its own pricing block (August 2026). It is a subscription with a reminder you have to set yourself.
Its pages describe reading the screen. We found no claim that it transcribes interviewer audio, so the question asked out loud appears to sit outside what it takes in.
Month to month it is $40 against our $49. The $9 buys a published model list and live interviewer transcription.

Credit where it's due

A native desktop application rather than a browser extension — the same architectural choice we made, stated in the same terms on its own home page.
Covers system design alongside algorithm questions, including reading architecture diagrams.
Names the four assessment platforms that actually matter for a coding round: LeetCode, CoderPad, HackerRank and CodeSignal.
The cheapest annual price in this comparison set by a wide margin: $15 a month billed at $180 a year.
Its home page states outright that “No tool can guarantee outcomes” — a more honest line than most pages in this category carry.

How the two are built

This is the closest architectural match in the comparison set, and the page is more useful if we say so. Both products are native desktop applications rather than browser extensions, both draw their own window, and both read the problem off the screen rather than injecting anything into the assessment page. StealthCoder's home page makes the point in almost the words we would use: a real desktop app, no browser extension, no localhost server.

The divergence is what each one consumes and what each one tells you. We transcribe interviewer audio continuously, so the question asked out loud and the problem rendered on screen are one context. Their pages describe reading the screen and did not, when we read them, claim audio as an input.

The second divergence is disclosure. We publish the model list per plan because a coding answer is only as good as the model behind it and we think you should be able to choose. StealthCoder states it does not publish provider or model names. Both are coherent positions; only one lets you pick.

We have not tested StealthCoder against a proctored assessment, and nothing on this page claims what any platform can or cannot observe when it runs.

What the platforms actually document

The detection question is really three questions, because the platforms run three different regimes. HackerRank's own knowledge base (August 2026) documents Secure Mode as a controlled browser environment: full screen enforced, copy and paste blocked, multiple monitors prevented, tab switches flagged. Proctor Mode keeps all of that and adds screenshot analysis, plagiarism detection and webcam anomaly detection.

Desktop App Mode is a different regime entirely. HackerRank documents it as a lightweight desktop application the candidate installs on Windows or macOS, which blocks other applications for the duration of the test — its documentation names video conferencing, messaging and LLM applications — detects and closes programs opened during the test, prevents screen sharing and screenshots, checks continuously for multiple monitors and screen mirroring, refuses to run on a virtual machine, and blocks remote access.

Read that list before you shop. If an employer sends you a HackerRank assessment in Desktop App Mode, the honest answer is not a different overlay — it is to sit the assessment on your own merits and put your preparation into the patterns it will actually ask about. Any vendor that tells you otherwise, including this one, would be selling something it cannot deliver.

The test is in a tab. The answer isn't.

Unless Desktop App Mode is on, a HackerRank test is a web page. Stealth Interview runs outside it, in a desktop window set to be excluded from screen capture.

It doesn't change what the webcam sees, the editor's own record of pastes and typing, or a browser noticing focus leave the test, and we haven't tested every browser and OS version a test runs on. Desktop App Mode is HackerRank's own native app, documented to close other programs: plan on Stealth Interview not running beside it, and prepare with the sliding window pattern instead.

What each HackerRank mode records

The plan tells you the model

Starter includes GPT-6 Luna and GPT-6.1 Terra. Premium and Hunter add GPT-6.1 Sol, GPT-6 Astra, Claude Sonnet 5.5 and Claude Opus 5.5. You know what is answering before you buy, and you can switch per question.

The interviewer's voice is an input
Interviewer audio is transcribed live, so a spoken follow-up lands in the same context as the code on your screen. A screen-only tool cannot hear the question that was never typed.
No card to start, no renewal to cancel
Our plans are bought outright for a fixed term — $49 a month, $150 for six months, $250 for a year. There is no trial that silently becomes a $40 subscription.
Everything is a keyboard shortcut
Capture, solve, move and hide are all bound to keys. In a shared-screen call your mouse cursor is visible to everyone; the keyboard is not.

When StealthCoder is the better buy

Price is the deciding factor: At $15 a month billed annually, StealthCoder is less than half our Hunter plan and roughly a third of Starter month-to-month. If you are between jobs and the subscription comes out of savings, that difference is real and we are not going to argue you out of it.
You are on Linux: Independent write-ups of StealthCoder mention Linux support; its own home page names Mac and Windows. If you interview from a Linux machine, check their current page — Stealth Interview is macOS and Windows only, so we are not an option at all.
You do not care which model answers: Not publishing model names is only a drawback if you want to pick. If you would rather the vendor make that call and keep it current, an unpublished model list is one less decision to make.

What the round is worth

Every plan on this page costs less than one offer is worth. The question is which one was built for the round.

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Company names and logos are trademarks of their owners. They show where technical interviews happen and are not customers, partners or endorsements.

Every plan includes unlimited usage

Starter

$49/ month

Get Starter

Includes:

GPT-6 Luna and GPT-6.1 Terra models
Desktop app for macOS and Windows
Conversational AI with follow-ups
Real-time interviewer audio transcription
Unlimited usage

Premium

Recommended

$150/ 6 months

Get Premium

Everything in Starter, plus:

GPT-6.1 Sol, GPT-6 Astra, Claude Sonnet 5.5 and Claude Opus 5.5
Early access to premium AI models
Accelerated AI solutions
Priority support

Hunter

$250/ year

Get Hunter

Everything in Premium, plus:

Unlimited Premium AI model usage
2-hour support window
Ultra-accelerated AI solutions
Priority features

StealthCoder

As published

Per stealthcoder.app (opens in a new tab).

Free trial$0 for 7 days — card required, renews at $40 / month
Annual Pro$15 / month, billed $180 / year
Monthly Pro$40 / month

Note

Read from StealthCoder's own home page in August 2026 and reproduced as printed. The trial requires a card and renews at the monthly rate — that is their page's wording, not our characterisation. Check the current page before you buy; we do not track their changes.

5 questions

StealthCoder alternative: common questions

Is Stealth Interview a good StealthCoder alternative?: Yes, if you want to know what is answering. They are the closest match in this category: both are native desktop apps for macOS and Windows that read the problem off your screen rather than injecting anything into the page. Stealth Interview also transcribes the interviewer's audio as context and publishes exactly which AI models each plan includes; StealthCoder's FAQ says it does not publish provider or model names.
Which is cheaper?: StealthCoder, on its published amounts. Its home page shows $15 a month billed annually at $180 a year, or $40 a month month-to-month, read in August 2026. Stealth Interview is $49 a month, $150 for six months or $250 for a year.
Which AI models does each one use?: Stealth Interview publishes the list: Starter includes GPT-6 Luna and GPT-6.1 Terra, and Premium and Hunter add GPT-6.1 Sol, GPT-6 Astra, Claude Sonnet 5.5 and Claude Opus 5.5. StealthCoder's FAQ states that it does not publish provider or model names.
Does either one handle system design?: Both say they do. Stealth Interview returns a written approach with a Mermaid architecture diagram. StealthCoder's FAQ says it analyses architecture diagrams and suggests scalability patterns.
Which coding platforms does Stealth Interview cover?: CoderPad, HackerRank, CodeSignal and LeetCode, alongside Zoom, Google Meet, Microsoft Teams and Webex.

Approach

Approach

Approach

What StealthCoder actually is

Where it costs you in the round

Credit where it's due

How the two are built

What the platforms actually document

The test is in a tab. The answer isn't.

The plan tells you the model

The interviewer's voice is an input

No card to start, no renewal to cancel

Everything is a keyboard shortcut

When StealthCoder is the better buy

What the round is worth

Every plan includes unlimited usage

Starter

Premium

Hunter

StealthCoder

StealthCoder alternative: common questions

Keep reading