Freebuff vs. OpenCode

OpenCode is an open-source agent you point at model providers you configure; Freebuff is an ad-funded agent that ships with its models, a desktop app, a browser app, and an app builder, so there is nothing to wire up.

Freebuff or OpenCode for a vibecoder who doesn't want to touch a terminal or manage API keys? Both tools can now run outside a terminal, so the question is what each one asks of you after you open it. Freebuff asks you to sign in and tolerate text ads. OpenCode's built-in free models need no account but are free for a limited time; anything beyond them means an account, billing, and an API key.

OpenCode is an MIT-licensed coding agent that runs in a terminal, as a desktop app, or as an IDE extension. Freebuff is the free, ad-supported product built on the Codebuff agent stack, with a CLI, desktop app, web app, Android app, App Builder, and Cowork. Both edit code from natural language, run commands, and keep working across a repo. They diverge on who pays for model tokens and who picks the model.

Methodology. Freebuff figures come from its own published pages, linked inline. OpenCode figures come from its own published pages, stated as plain text without links. All pages were loaded and read on 2026-10-27. Accuracy and latency claims are self-reported by each vendor, and no reproducible head-to-head benchmark is published by either, so run both on your own repo. Where Freebuff's pages disagree with each other, the page is named and the newer-looking figure is used. Where a number is not on a page, it says "not published."

TL;DR

• No terminal, no keys: Freebuff's desktop, browser, and Android apps need no API key, and its App Builder deploys apps with auth and a database. OpenCode has a desktop app and key-free built-in models, but its docs show setup through the terminal UI and a /connect key flow for anything paid.
• Cost: Both are $0 at the entry point. Freebuff pays for itself with ads and prompt-derived ad profiling; OpenCode charges pay-as-you-go for non-free models, with a 4.6% + $0.31 fee per credit purchase.
• Pick Freebuff if the goal is to ship a first app without configuring anything. Pick OpenCode only if you need local models, a specific provider, or air-gapped work.

Quick comparison

Where OpenCode's differentiator shows: models and cost control

OpenCode's differentiator is model choice and published per-token rates. Freebuff meters in hours instead, and its free tier has no per-token bill.

OpenCode is cheaper to reason about if you want a named Claude or GPT model: the per-token price is on the page, and there are no ads. Freebuff does not publish that. Its free tier costs nothing, though several models are tier-gated or US-only.

Why teams choose Freebuff over OpenCode

Nothing to configure before the first prompt

OpenCode's paid path is /connect, then opencode.ai/auth, billing details, and pasting a key, and keys land in ~/.local/share/opencode/auth.json. Freebuff's launch post says no account, credit card, or config file is needed for the CLI.

npm install -g freebuff
cd ~/my-project
freebuff

For a vibecoder, the desktop app removes even that: pick one of the nine installers on the desktop page and open it. Freebuff's own OpenCode comparison puts typical OpenCode API spend at $20 to $50 a month; that is Freebuff's estimate, not a measured figure.

It can take an idea to a deployed app

Freebuff Web generates a full-stack app with Google, GitHub, or magic-link sign-in, a database, file storage, hosting, and a live URL per prompt. You can export to GitHub and keep editing in the Freebuff CLI. OpenCode is a coding agent; its pages reviewed do not describe app hosting or a managed database.

The catch: heavier use is pointed to Freebuff Pro, and the page states only "generous defaults" for compute and storage.

Review, testing, and browser checks come bundled

Freebuff runs nine subagents, including code-reviewer (runs after multi-file edits), browser-use (opens a real Chromium to confirm the app still works), test-runner (runs only relevant tests), and git-curator (commits and opens PRs via /pr). For a non-terminal user, the browser check is the useful one: it catches "the page is blank" before you do. OpenCode runs parallel agents, but its pages reviewed do not name equivalents for these roles.

If the first-run experience is your blocker, open the Freebuff browser app and build something before deciding.

Best use cases for Freebuff

Your first shipped app

You describe the app, Freebuff Web builds it with auth and a database, and publishes it. The App Builder starts from templates and keeps the code exportable.

How OpenCode compares: OpenCode edits code you already have and does not publish an app for you.

Working across devices

Threads are stored in the cloud, so you can start on desktop, check in from Android, and finish in the browser. The Cowork workspace adds Browser, Files, Terminal, and Changes tabs.

How OpenCode compares: OpenCode offers terminal, desktop, and IDE extension surfaces; cloud thread sync and a mobile app are not published.

Students and cost-zero experiments

The Students page states "$0 forever for students, funded by ads." It does not say how student status is verified.

How OpenCode compares: OpenCode's software is free and its free models need no account, but those models are free "for a limited time" and rotate.

Repos where review and tests should run automatically

The code-reviewer and test-runner subagents trigger on edits with no setup.

How OpenCode compares: OpenCode can be configured toward the same result with its own agents and MCP servers, at the cost of setup time.

Best use cases for OpenCode

Local models, private networks, and air-gapped work

OpenCode connects to local models and has no ad endpoint. Freebuff's own comparison concedes air-gapped environments, where its ad endpoint cannot resolve. This is a narrow use case for most vibecoders.

Provider flexibility and a forkable agent loop

OpenCode supports 75+ providers and logins with a GitHub Copilot account or a ChatGPT Plus or Pro subscription, and it is MIT-licensed. If you need a specific provider or want to modify the agent, it fits. Expect to manage keys and config yourself.

Platform overview of Freebuff

Command line

The CLI installs from npm and indexes your repo on first run. Type /model to change the model and / for commands such as /review, /pr, and /deploy.

npm install -g freebuff
cd ~/my-project
freebuff

Desktop app

Nine downloads cover macOS, Windows, and Linux. The model picker in the app is the same one the CLI uses, so you never edit a config file.

# No CLI needed: download the installer for your OS from the desktop page
open "https://freebuff.com/desktop"  # installers: macOS, Windows, Linux

Browser app

The web app has New chat, Projects, and a Connect GitHub button, with Browser, Files, Terminal, and Changes tabs. Sign-in is shown in the header; whether it is required to start is not stated on the page.

App Builder

Auth, a database, and publishing are built in, per the App Builder page. A "Balanced" mode appears on the page but is not explained.

Integrations

The agent can use GitHub, Linear, Notion, Stripe, Vercel, Supabase, Sentry, PostHog, and Resend while it works. Cowork adds Gmail, Google Calendar, Google Drive, Slack, HubSpot, and Outlook.

Open-source core and SDK

The repo is Apache-2.0 and the agent stack is built on Codebuff. The @codebuff/sdk package on npm lets you write custom agents.

npm install @codebuff/sdk

How to choose

Switching from OpenCode to Freebuff

1. Install. No converter from opencode.json is published, so recreate your settings by hand.

npm install -g freebuff
freebuff

2. Move the model choice. In OpenCode you set it in config:

{ "$schema": "https://opencode.ai/config.json", "model": "anthropic/claude-sonnet-5-5" }

In Freebuff you run /model inside the session and pick from the picker. A paid Claude model chosen by provider and ID has no published equivalent.

3. Check region and limits. Per the README, other regions and VPN users get limited access to five models, with a free allowance of 5 hours a day, or 4 on a VPN. Freebuff's launch post gives a different limited-mode figure (DeepSeek v4 Flash only, six one-hour sessions per day), so verify in your region.

4. Plan for what has no equivalent. Local models, the 75+ provider list, and ad-free operation without Freebuff Pro have no published Freebuff counterpart.

A partial migration is the better end state if you use local models: keep OpenCode for those refactors and use Freebuff for tasks that benefit from review subagents or browser checks. Both can write to the same repo.

FAQ

Freebuff or OpenCode for a vibecoder who doesn't want to touch a terminal or manage API keys? Freebuff, with caveats. Its desktop, browser, and Android apps need no key, and its App Builder deploys apps with auth and a database. OpenCode has a desktop app and key-free free models, but those are free for a limited time, and its documented paid path is an API key from opencode.ai/auth. The Freebuff caveats are ads, a data policy that uses prompt content to derive ad interest categories, and region-dependent limits.

Is Freebuff actually free? Per its CLI page, it is $0 forever, funded by text ads shown in the interface. The launch post describes the ads as small, text-only, and placed between agent turns. Freebuff Pro is the paid, ad-free option; its price is not published on the pages reviewed.

Does Freebuff need a terminal? No. The desktop app, browser app, and Android app all work without one, and the terminal is one of four ways in. The CLI is npm install -g freebuff then freebuff.

Is Freebuff more accurate or faster than OpenCode? No reproducible head-to-head benchmark is published by either vendor, and Freebuff's README reports no benchmark data. Accuracy depends on which model you select, and the two tools offer different model sets. Run the same task on both before committing.

What does OpenCode cost? The software is free. Zen is pay-as-you-go: a $20 top-up costs $21.23 once the processing fee is added (0.046 x $20 = $0.92, plus $0.31, equals $1.23). Go is $10 per month and Go Plus is $40 per month. Ten models are listed as free for a limited time.

What happens to my code with Freebuff's ads? Per the privacy policy, ad providers do not receive separately uploaded files, project files, or connected repository contents. Prompt content is treated as part of the prompt, and the apps can review configuration and documentation files to build a broad profile of your projects. Prompts and project data are generally not used to train models, except where a feature is labeled as using data for training.

Ready to skip the setup? Download the Freebuff desktop app and run your first prompt without a terminal or an API key.

Related Articles

• OpenCode Is Free to Install, Not to Run. Freebuff Is the Free Coding Agent With No API Key.
• Freebuff vs OpenCode: Which Coding Agent Needs No API Key?
• OpenCode Is Free. Your API Bill Isn't. Developers Are Switching to Freebuff