
AI-native code editor built on VS Code fork with deep multi-file editing and intelligent codebase indexing.
Appen records 665,840 monthly visits with +0.2% month-over-month growth and Contact for Pricing pricing. VS Code records 7,397,370 monthly visits with -3.8% growth and Freemium pricing.

Human-validated training data and evaluation services for frontier AI models
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | appen.com | code.visualstudio.com |
| Pricing Model | Contact for Pricing | Freemium |
| Monthly Visits | 665.84K (665,840) | 7.4M (7,397,370) |
| MoM Traffic Delta |
| +1.1K (+0.2%) |
| -288.8K (-3.8%) |
| Primary Market & Share | 🇺🇸 United States (22%) | 🇺🇸 United States (18.9%) |
|---|
| Direct Visits / mo | 238.31K | 2.17M |
|---|
| User Rating | 4.4 | 4.8 |
|---|
| Supported Platforms | Website | Website |
|---|

Human-validated training data and evaluation services for frontier AI models
Chain-of-thought reasoning traces, SME-level RLHF, supervised fine-tuning demonstrations and adversarial red teaming for the most capable models.
Golden trajectories, RL environment design, failure-mode taxonomies and software-engineering-driven deep evaluation for autonomous agents.
Multilingual ASR and conversational speech data, expressive TTS annotation, vision-language model training data, video action labelling and voice-agent evaluation.
LiDAR point-cloud labeling, multi-camera sensor fusion, robot demonstration trajectories, world-model rollouts and embodied interaction logs.

Write code with precision, hand bigger jobs to agents, and keep working from anywhere
Agents open the repository, form a plan, edit multiple files and explain the changes so you can review each diff before accepting it. You can also run several agents in parallel to push a backlog forward.
Point the editor at Anthropic, OpenAI, Google, Microsoft or open-weight models, or bring your own key. Pick the Copilot, Claude or Codex harness that matches how you like to work.
JavaScript, TypeScript, HTML and CSS work out of the box, and Marketplace extensions add IntelliSense, linting, refactoring and debuggers for Python, Java, C++, Go, Rust and more.
Integrated terminal, source control, debugger, testing, Jupyter notebooks, an integrated browser and Dev Containers all live in one window, so you stay close to the code.

AI-native code editor built on VS Code fork with deep multi-file editing and intelligent codebase indexing.
SpecialistConnects teams directly with verified human participants for preference tuning and studies, but lacks managed end-to-end labeling pipelines.

Agentic development platform offering an IDE and command center for running parallel AI coding agents.
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AI-powered IDE and coding agent that understands entire projects to plan, edit, and test code.
AI-native code editor built on VS Code fork with deep multi-file editing and intelligent codebase indexing.
SpecialistConnects teams directly with verified human participants for preference tuning and studies, but lacks managed end-to-end labeling pipelines.
Agentic development platform offering an IDE and command center for running parallel AI coding agents.
SpecialistCloud-based development environment featuring an AI agent that builds, runs, and deploys full-stack applications instantly.
Agentic coding platform and IDE plugin that reads entire codebases to plan and complete multi-file tasks.
Spec-driven AI IDE and agent platform from AWS that plans, builds, reviews, and verifies engineering work.
SpecialistAutonomous AI software engineer that independently plans, writes, and tests code across entire repositories.
Free / Open-sourceLightweight, customizable terminal coding agent supporting multiple model providers and extensible packages.
Blends custom software with dedicated human expert teams to handle complex operations, but operates as a bespoke service.
Combines robust data labeling tools with automated workflows, but focuses more on software tooling than managed human workforces.
AI-powered IDE and coding agent that understands entire projects to plan, edit, and test code.