Live product · Available now · Mac + Windows
Claude API Azure OpenAI

Prepare, practice, and respond with better context.

ZeroLagAI is a local-first desktop AI coach for technical interview preparation and high-pressure professional conversations. It combines speech, screen context, and your own notes to deliver fast, relevant guidance in about one second, powered by frontier AI models including Claude (Anthropic) and GPT-5.6 (Azure OpenAI).

Understands spoken questions during practice sessions
Analyzes code, diagrams, SQL, and other screen context
Uses your own Markdown notes and role-specific knowledge
Frontier AI (Claude or GPT-5.6) streams a focused answer in ~1 second
Get access See demo

Live, production-ready desktop application for Mac and Windows. Founded 2025 · 20+ engineers actively using ZeroLagAI · Founder-led onboarding, responses within 24 hours.

~1 second to first answer word
Local-first audio and screen processing
20+ engineers actively using it
Claude + Azure OpenAI frontier models
AI infrastructure
Claude API · Anthropic
Azure OpenAI · GPT-5.6
Multi-model · Low latency · Local-first

Powered by Claude (Anthropic API)

ZeroLagAI uses Claude as its primary inference engine. Every coaching response, every context-aware answer, every streamed word is generated by Claude via the Anthropic API. Claude was chosen for its instruction-following quality and ability to apply personal prep notes accurately across multi-turn sessions.

Claude API · Primary inference Streaming responses Multi-turn context Personal knowledge files
20+
Engineers using ZeroLagAI
2025
Founded & launched
~1s
Avg. response latency
2
Platforms: Mac + Windows
Claude API
Primary inference (Anthropic)

I was getting generic answers from ChatGPT, but ZeroLagAI actually reads my prep notes and gives me answers grounded in what I already know. Cleared my system design round at a fintech company.

AK
A.K.
Senior Backend Engineer, Bengaluru

The voice detection is seamless. No clicking, no switching windows. It just picked up the question and streamed the answer. Used it across 4 mock rounds and landed my offer.

SR
S.R.
Java Developer, actively interviewing
Operational status

A launched product available today.

ZeroLagAI is fully developed and available to purchase now. The desktop application, pricing, onboarding flow, and customer support channel are active.

● Available now

Production desktop application

Built for macOS and Windows. Founded in 2025, live to paying customers. Customers receive the application and onboarding guide after payment confirmation.

● Active

Commercial offering

Starter and Unlimited subscription plans are available now. Email admin@dsbuilds.dev to purchase. After payment confirmation, the application and onboarding instructions are sent directly by the founder.

● Powered by Claude

Claude API (Anthropic)

ZeroLagAI uses Claude as its primary inference engine. Every coaching response is generated by Claude via the Anthropic API. Claude was chosen for its instruction-following quality and long-context handling across multi-turn sessions.

See it in action

Real recordings. Not a mockup.

These are actual screen captures of ZeroLagAI during use. No staging, no edits.

Understands spoken prompts automatically. No manual trigger.

During a mock interview or practice session, ZeroLagAI detects the end of a spoken question and streams structured guidance from Claude automatically.

Auto speech detection ~1s to first word Claude-powered answer
  • Continuous audio processing during practice sessions
  • Detects when the question ends, fires Claude pipeline instantly
  • Claude guidance appears in a focused desktop overlay
  • Session history kept so follow-up questions have full context
zerolagai / voice-answering-demo Recording

Or type any question manually and get an instant Claude answer.

If a question appears on a slide, a whiteboard, or you just want to ask something directly, type it in and press enter. Claude responds in seconds.

⌘Enter to focus Same ~1s response Claude inference
  • Useful when the question appears on screen, not spoken
  • Works alongside voice mode, both can be active at once
  • Your prep notes and session history still apply
  • One shortcut to focus the input, enter to fire
zerolagai / manual-input Live
You typed
What is the difference between a process and a thread, and when would you use each?
✦ Claude answer
A process is an isolated program with its own memory space. A thread is a unit of execution within a process, sharing memory with other threads in the same process.

Use threads when tasks need to share data cheaply (e.g. a web server handling concurrent requests). Use separate processes when isolation matters (e.g. browser tabs, microservices).
Type your question here...

Load your prep notes. Claude uses them for every answer.

Load any Markdown file before a session: Java notes, system design templates, company research, or role-specific material. Claude applies it as context to every response.

Any .md file Your notes, Claude's context Per-role, per-company
  • Load different knowledge files for different roles and sessions
  • Claude reads the full file, not just keywords
  • Applied to every voice, screenshot, and typed question
  • Answers feel grounded in your prep, not generic
zerolagai / md-reference-demo Recording
How it works

A production-ready desktop AI workflow.

ZeroLagAI runs as a native desktop application on your own machine. Configure audio, optional knowledge files, and Claude API access once, then use the same setup across all your practice and coaching sessions.

1

Start the app and set your context

Launch ZeroLagAI before a practice or coaching session. Optionally load a Markdown reference file with your preparation material. Configure system audio once using BlackHole on Mac or Stereo Mix on Windows.

optional: load any .md prep file
one-time audio routing setup
inference: Claude API or Azure OpenAI
2

Feed it the question any way you need

Voice detection runs automatically. For anything visual on screen, press ⌘S to enter capture mode, then select the region you want. You can take multiple screenshots in one go: a diagram, then a code block, then a schema. When you are done selecting, click Ask and all of them get analyzed together. For anything you want to type yourself, one shortcut opens the manual input.

auto speech detection, no trigger needed
⌘S capture mode, select any region, multi-shot
click Ask when done to submit all screenshots
⌘Enter to type a question manually
3

Claude streams focused, context-aware guidance into the desktop overlay

The assembled context, your question, your notes, and optional screenshots, is sent to Claude via the Anthropic API. Claude generates structured, role-specific coaching responses that stream word by word into a lightweight desktop overlay. The first word appears in about a second. Your entire prep file and session history are included in every Claude API call, so every answer is grounded in your own preparation material.

Claude API (Anthropic) · primary inference
local-first preprocessing before every Claude call
full prep file sent as context on every request
first word in ~1 second, streams word by word
Features

Everything built around one question:

What would actually help someone think more clearly under pressure? Every feature answers that, with Claude handling the intelligence layer and local preprocessing keeping everything fast.

Automatic speech understanding

Processes system audio locally, detects the end of a spoken prompt, and starts the Claude pipeline automatically during practice and coaching sessions.

Screenshot capture

Press a shortcut and drag a region. Any coding problem, SQL schema, system diagram, or chart on your screen gets sent to Claude for analysis in the same pipeline.

Markdown reference files

Load your prep guide as a .md file before the session starts. Claude applies it as context to every answer. Your Java notes, system design templates, company research.

Multi-model AI inference

ZeroLagAI runs on frontier models including Claude (Anthropic) and GPT-5.6 via Azure OpenAI. Both are integrated into the same low-latency pipeline, with local preprocessing keeping response time under one second.

Local-first privacy

Speech transcription, screen analysis, and personal knowledge files are handled locally wherever possible. Only the final assembled prompt is sent to Claude via the API.

Streaming answers

The first word appears in about a second. Claude's full answer streams word by word, so you start reading while it is still being generated and waste no time.

Why ZeroLagAI

Built for privacy, context, and low latency.

ZeroLagAI combines a native desktop experience with multimodal context and local processing, while using Claude via the Anthropic API where it adds the most value.

ZeroLagAI Cloud-based tools
Speed ~1 second from prompt completion to first response word, with local preprocessing before the Claude API call. Browser-first workflows often depend on more cloud-side processing and network round trips.
AI model Claude (Anthropic) + GPT-5.6 (Azure OpenAI), applied to multi-turn sessions with your own prep files as context. Varies by tool. Many use generic prompting without personal context.
Input modes Voice, screenshot, manual typing, and personal knowledge files. Four input modes in one app. Many tools focus primarily on one input mode or require switching between products.
Context Load your own Markdown file. Claude applies your prep notes to every answer. Context is often limited to what is typed or uploaded into each individual session.
Privacy Audio and screen on your machine. Only the final prompt leaves your device, sent to Claude. Audio and screen content routed through a third-party cloud server.
Price From $20/mo. Choose a light plan or go unlimited. Up to $150/mo for unlimited. Credit-hour pricing that's hard to predict mid-session.
4+
Years backend eng.
2025
Founded
Founder & builder

Satuluri Deepak

Founder & Software Engineer, ZeroLagAI · dsbuilds.dev

ZeroLagAI is independently built and operated by Satuluri Deepak, a Senior Backend Engineer with 4+ years of experience building production API infrastructure for banks including EWB, RCBC, and Tonik. ZeroLagAI is a deliberate, real-use product built to solve a problem the founder experienced firsthand: getting fast, context-aware guidance during high-pressure technical interviews. The product is powered by Claude (Anthropic API) as its primary inference engine, using a local-first architecture to keep latency under one second. Claude was specifically chosen for its instruction-following quality and its ability to apply personal context files accurately across multi-turn sessions. Support, onboarding, and product questions are handled directly by the founder.

GitHub ↗ LinkedIn ↗ Portfolio ↗ admin@dsbuilds.dev View product demos
Production pricing

Simple, honest pricing.

Choose the plan that fits your preparation workflow. Email us to get started.

Starter

Starter

$30 $20 / month

10 sessions included. Simple monthly access. A good fit for occasional preparation and coaching.

  • 10 coaching sessions per month
  • Automatic speech detection
  • Screenshot capture for coding, SQL, and system design
  • Load your own Markdown reference file
  • Claude-powered answers (Anthropic API)
  • Mac and Windows. Cancel anytime.
Get started via email

Email us to purchase. We send the application and setup guide directly after payment confirmation.

Most popular

Unlimited

$49 $39 / month

Unlimited sessions. For frequent technical preparation, mock interviews, and coaching sessions without counting usage.

  • Unlimited sessions (fair use)
  • Everything in Starter
  • No per-session anxiety during a busy search
  • Full session history across coaching sessions
  • Claude-powered answers (Anthropic API)
  • Mac and Windows. Cancel anytime.
Get started via email

Email us to purchase. We send the application and setup guide directly after payment confirmation.

Compare that to $13 per credit-hour with cloud tools, or up to $150/mo for their unlimited plan.

Every purchase is handled directly by the founder. You get a personal onboarding, direct setup support, and a response within 24 hours. Email admin@dsbuilds.dev to get started.

FAQ

The questions most people ask first.

ZeroLagAI is designed for technical interview preparation, mock interviews, structured practice, and high-pressure professional coaching. It helps users work through spoken and visual technical prompts with their own preparation material available as context. The AI layer is powered by Claude, Anthropic's AI model, which provides the coaching responses.
ZeroLagAI uses Claude (Anthropic API) as its primary inference engine for all coaching responses. Claude was chosen specifically for its instruction-following quality, long-context handling, and its ability to apply personal reference material accurately across multi-turn sessions. Every voice question, screenshot, and typed prompt is assembled locally and sent to Claude via the API. The local preprocessing pipeline (audio transcription, screen analysis) runs entirely on your device. Only the final assembled prompt reaches Claude for inference.
ZeroLagAI is local-first. Audio transcription, screen preprocessing, and personal knowledge files stay on the device wherever possible. Only the information required for model inference is sent to Claude via the Anthropic API.
Load any Markdown file before a session: Java preparation, system design notes, company research, or a custom knowledge file. ZeroLagAI passes it as context in the Claude API prompt for every response. You can use different files for different roles or practice scenarios.
Starter includes 10 sessions a month at $20/mo. Unlimited is intended for frequent preparation and coaching, with fair use applying so the plan stays sustainable. One session supports up to 60 minutes of use.
ZeroLagAI is a desktop application for Mac and Windows. It is designed to work with your existing preparation workflow and common communication tools without requiring a browser extension.