Catalog Systems Agent IDEs & coding harnesses Replit Agent v3

Replit Agent v3

https://replit.com/ai

Cross-listing of Replit Agent at the harness layer. Replit Agent v3 (2025) added background agents + agent-driven deploy. The Coding-agent-memory row remains canonical for the memory framing.

Active · Verified 2026-10-27 · fresh as of 2026-10-27 · 54 cited facts, 1 with a third-party source · 1 recorded change · Suggest a correction

At a glance

Type
Cloud IDE with autonomous coding agent (Replit) vendor fix
Tier
T1
Section
Agent IDEs & coding harnesses
Created
2024-09 vendor fix
Latest release
Replit Agent 4 (2026-03-13) vendor fix
License
not applicable — not OSS fix
GitHub
not applicable — no GitHub repo fix
Pricing
Core $20/mo ($18/mo billed annually); Pro $100/mo ($90/mo billed annually; higher usage tiers up to $2,000/mo); Enterprise custom vendor fix
Funding
Replit — $97M Series B 2023 + later rounds (~$1.16B val) vendor fix
Freshness
2026-10-27 fix
Layer
agent-infra repo fix
Licensing
commercial vendor fix
Deployment locus
cloud vendor fix
Platform vs product
product vendor fix
Accelerator
yc-w18 third-party fix

When to use

Optimised for: browser-only end-to-end prompt-to-deploy

Anti-fit: Replit-hosted only; less control than desktop IDEs

Pros & cons

Pros

Only major agent that ends in a live deploy URL with no other infra needed; massive new-developer user base.

Cons

Locked to Replit's hosting; less raw IDE power than VS Code forks; cost can climb on long agent runs.

Claims & capabilities

Replit Agent v3 GA 2025; Replit-claimed 30M+ users; $97M Series B (2023) + recent funding rounds; key feature: end-to-end deploy from prompt.

Technical surface

API surface
Web IDE + REST API
Backend storage
Replit-hosted
Deployment
Both (self-hosted + managed cloud) — managed SaaS; enterprise Bring Your Own Cloud on AWS, Azure or Google Cloud (Full BYOC private preview, 2026-10)
Embedding model
not applicable — not a memory product
Multi-tenancy
per-user / per-team
MCP
yes — one-click MCP server list plus custom MCP servers; Agent loads their tools
A2A
searched not found
OpenTelemetry
searched not found

Alternatives to Replit Agent v3 → live options ranked by shared design, licence, hosting and MCP support

Similar systems

Other agent ides & coding harnesses in the catalog, ranked by inbound references.

  • Claude Code (Anthropic) T1

    Anthropic's agentic coding tool: Claude as a coding agent in the terminal, IDEs (VS Code, JetBrains), desktop app, web/mobile, GitHub and Slack. Context via CLAUDE.md, skills, hooks, subagents and MCP servers.

  • Cursor (IDE) T1

    AI-first IDE that forked VS Code; Composer (multi-file edit) and Agent Mode (long-running coding agent) are its flagship surfaces. Memory layer = .cursorrules / Rules; recall via repo-aware Context Engine. Anysphere (parent) raised $900M Series C at $9.9B in May 2025; acquired by SpaceX (announced 2026-08-14, terms undisclosed), product continues under the Cursor brand.

  • OpenAI Codex CLI T1

    OpenAI's actively developed OSS terminal coding agent (Apr 2025), now written in Rust (codex-rs replaced the original TS CLI); also IDE extension + desktop app. Separate from the Codex Web cloud agent and the retired 2021 Codex model API. The codex mcp-server command (Codex as an MCP server) was deprecated on 2026-08-24 and removed in CLI 0.154.0 (2026-09-09); OpenAI points integrations to the experimental Codex app server, and codex mcp still connects Codex to external MCP servers.

  • Opencode (SST) T2

    SST team's open-source terminal coding agent — TypeScript, multi-model, MCP-native. Released 2025; explicitly positioned as a permissively-licensed Claude Code alternative. Memory via AGENTS.md (the emerging cross-harness convention).

  • Bedrock AgentCore (AWS) T2

    AWS Bedrock AgentCore — managed runtime to deploy + scale + observe agents. Multi-component: Runtime, Identity, Memory, Gateway, Browser, Code Interpreter, Observability. Distinct from Bedrock Agents (older fixed-config product); AgentCore is the 2025 framework-agnostic runtime for any agent (LangGraph, CrewAI, Strands, OpenAI Agents SDK).

  • GitHub Copilot (Agent Mode) T1

    The original AI coding assistant (Copilot in editor; 2021). 2025 evolved into a full agentic surface: chat, completions, Agent Mode (multi-step), and Copilot Workspace. Backed by Microsoft. Distinct row from Workspace — this row covers the everyday in-editor + agent mode product, Workspace covers the hosted spec-driven workflow.

Sources (53 cited facts, 1 third-party)

Each fact links to the page it came from; the badge says who published it (how to read sources).

What changed

Changes to this record's lifecycle, licence, release, pricing and hosting facts, from the catalog's git history. Subscribe (Atom)

  1. 2026-10-27
    • Latest release “not applicable — not OSS” → “Replit Agent 4 (2026-03-13)” source
    • Pricing “Free + Core ($20/mo) + Teams” → “Core $20/mo ($18/mo billed annually); Pro $100/mo ($90/mo billed annually; higher usage tiers up to $2,000/mo); Enterprise custom” source
    • Deployment “Cloud” → “Both (self-hosted + managed cloud) — managed SaaS; enterprise Bring Your Own Cloud on AWS, Azure or Google Cloud (Full BYOC private preview, 2026-10)” source
    • MCP support first recorded as “yes — one-click MCP server list plus custom MCP servers; Agent loads their tools” source
    #273

Related systems

References (1)