# AI Coding Tool Selection Guide

Too many tools to choose from? Start by asking yourself one question: **Do you want AI to assist you on the side, or do you want it to run tasks directly for you?**

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## Start with Your Scenario

**I write code in VS Code and need AI to help me edit files and execute tasks**
→ See [IDE Plugins](#ide-plugins-cline--roo-code--continue)

**I want to run AI in the terminal to handle large tasks or automation**
→ See [Coding CLIs](#coding-cli-claude-code--aider--codex)

**I want a ready-made AI IDE that works out of the box**
→ See [AI IDEs](#ai-ide-cursor--trae)

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## IDE Plugins: Cline / Roo Code / Continue

All three are VS Code plugins, bring-your-own-key (BYOK), free to use.

### Cline
- Role: The most fully featured AI coding Agent plugin, 5M+ installs, most active community
- Supports parallel sub-agent execution, CLI mode, unlimited MCP tools
- Each step requires confirmation, with checkpoints for rollback
- **Best for**: Developers who want the strongest Agent capabilities and need fine-grained control

### Roo Code
- Forked from Cline, overall capabilities are similar, adds customizable Architect / Coder / Debugger modes
- Each mode restricts the range of tool access, better suited for teams and compliance-required environments (SOC 2)
- **Best for**: A drop-in replacement for Cline, or teams that need compliance capabilities

### Continue
- Different positioning: CI/CD first, AI code review can serve as an automated status check for GitHub PRs
- Also provides chat, auto-completion, and inline editing; supports VS Code and JetBrains
- Agent capabilities are relatively weaker, but unique in code quality gate scenarios
- **Best for**: Teams that care about code quality enforcement and need JetBrains support

> Cline and Roo Code can both be installed directly inside Cursor and used simultaneously without conflict.

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## Coding CLI: Claude Code / Aider / Codex

Runs in the terminal, independent of any IDE. Suited for large tasks, automation, and unattended execution.

> Key data point: The same model used in different tools can show a performance gap of up to 16 percentage points. The tool itself matters, not just the model.

### Claude Code
- Strongest autonomous execution capability, Terminal-Bench 2.0 score 92.1%
- Supports `CLAUDE.md` for persistent project context, Agent Teams with parallel sub-agents
- Higher token consumption; context may be lost in long sessions (>2 hours)
- **Best for**: Running large tasks unattended, complex multi-step automation

### Aider
- Git-first: every AI change is automatically committed, full audit trail
- Token efficiency is 4.2x higher than Claude Code, supports local models (Ollama)
- Not suited for large-scale autonomous orchestration; better for incremental changes
- **Best for**: Budget-conscious users, those who need a complete Git history, and refactoring work

### Codex
- GPT-powered, can execute in cloud containers in the background after disconnection
- Strong at application development (iOS / macOS / Web); multi-step chained task coherence is average
- Included in the ChatGPT Plus subscription, good value
- **Best for**: Users who already have ChatGPT Plus and are doing application development

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## AI IDE: Cursor / Trae

For those who don't want to install plugins and prefer a complete, out-of-the-box AI coding IDE.

### Cursor
- Tab completion is its core competitive advantage, smooth day-to-day coding experience
- Background Agent can independently execute tasks in cloud VMs (Pro+)
- Requires leaving the VS Code ecosystem, some vendor lock-in risk
- Requires the Pro plan ($20/month) to connect custom models
- **Best for**: Those who don't mind lock-in and prioritize a smooth everyday coding experience

### Trae
- Made by ByteDance, interface style is close to Cursor
- Account login may currently be restricted in some regions
- **Best for**: Users who want a Cursor-like experience, particularly users in China

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## Cost Comparison

| Tool | Pricing Model | Approximate Cost |
| --- | --- | --- |
| Cline | Free, pay your own API fees | Pay-per-use, light usage ~$5–20/month |
| Roo Code | Free, pay your own API fees | Same as above |
| Continue | Free and open source | Pay your own API fees |
| Claude Code | Subscription | $20–100+/month |
| Aider | Free, pay your own API fees | High efficiency; same tasks cost ~1/4 of Claude Code |
| Codex | Included in ChatGPT Plus | $20/month (no extra cost if you already have Plus) |
| Cursor | Subscription | Pro $20/month, Business $40/month |
| Trae | Free | Currently free |

> When connecting to UModelverse with BYOK tools (Cline / Roo Code / Aider / Continue), costs depend on the model you choose and your usage volume, and are fully under your control.

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## Combination Usage

These tools are not mutually exclusive — many developers use several simultaneously:

**Cursor + Cline**: Cursor provides smooth Tab completion while Cline handles complex Agent tasks. Both can be installed at the same time without interfering with each other.

**Claude Code + Aider**: Claude Code runs large tasks; Aider handles everyday small changes — the latter has higher token efficiency, saving money.

**Continue + any CLI**: Continue handles PR code quality checks while the CLI tool handles local development — two complementary dimensions.

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## Quick Decision Guide

| My Situation | Recommendation |
| --- | --- |
| Using VS Code, want the strongest Agent capabilities | Cline |
| Using VS Code, team has compliance requirements | Roo Code |
| Need JetBrains support | Continue |
| Want to run large tasks without monitoring them | Claude Code |
| Budget is limited, need Git history | Aider |
| Have ChatGPT Plus, doing application development | Codex |
| Want a complete AI IDE and willing to pay a subscription | Cursor |