Fern vs opcode vs OpenCode vs OpenAI Codex CLI

Which one fits you in 2026? Traffic, pricing, input → output, tasks and community side by side.

Your tool
Fern
vs
Competitor 1
opcode
Competitor 2
OpenCode
Competitor 3
OpenAI Codex CLI
Compare
4 tools · best value per row highlighted
Your tool Fern
buildwithfern.com
Fern is a developer platform that produces documentation websites, client libraries and a command-line interface for an API from one definition.
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Competitor opcode
opcode.sh
opcode is a free, open-source desktop application that gives Anthropic's command-line coding agent a graphical interface.
Make main Remove
Competitor OpenCode
opencode.ai
OpenCode is an open-source AI coding agent that helps developers write code in the terminal, an IDE or a desktop app.
Make main Remove
Competitor OpenAI Codex CLI
developers.openai.com
OpenAI Codex CLI brings the Codex coding agent to the terminal and to scripts.
Make main Remove
Traffic estimated monthly website traffic
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Bounce rate lower is better
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Pricing
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Free tier
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Free trial
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API access
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Plans
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Open source Free
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GPT-6-Astra $10GPT-6.1-Sol $2GPT-6-Luna $0.10GPT-Live-1 $0.05/minute+1 more
Capabilities input → output
Input
Code
CodeText
CodeText
CodeImagesText
Output
AppsCode
Code
Code
Code
Skill level
Advanced
Advanced
Advanced
Advanced
Categories
Development & CodeAI Developer Tools
Development & CodeAI Coding AssistantAI Developer Tools
Development & CodeAI Coding Assistant
Development & CodeAI Coding Assistant
Tasks what each tool can do · 0 shared · core   partial
Tasks covered
3
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3
2
Coding
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Developer tools
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Code documentation
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Development
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MCP
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Community on aitoolstime
Rating
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Upvotes
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Saves
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Reviews
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Prompts
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Verified listing
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Traffic figures are third-party estimates for the tool's own domain; tools sharing a domain with a bigger product are not counted. Pricing is captured from each tool's site and may lag.