If you write code for a living, there's a good chance GitHub Copilot is the first AI tool you ever installed. It sits quietly in your editor, finishes your sentences, and costs $10 a month for the individual plan. But it's no longer the obvious default it was a few years ago — a wave of open-source, free and differently-priced tools have shown up that either do the same job for nothing, or push further into letting an AI actually finish a task instead of just a line. This guide walks through six real ones, what they're actually good at, and where they fall short, so you can pick based on facts instead of hype.
GitHub Copilot: the baseline everyone compares to
GitHub Copilot gives you real-time code suggestions as you type, works across most popular editors and devices, and is genuinely a productivity boost for everyday coding. The trade-offs are just as real: it's a recurring subscription cost per seat, and like every AI code tool it can still generate code that isn't optimal and needs a human check. It's the tool most teams already have, which is exactly why the alternatives below have to earn their place against it.
Cline: the free option that can act on its own
Cline is an open-source assistant that lives inside your editor but goes further than autocomplete — it can edit multiple files, run terminal commands, and fix its own lint errors, while you approve each step. It has real traction behind it: over 8 million installs and 65,000+ GitHub stars, plus enterprise names like Samsung, Salesforce and Oracle cited as users. It's free to use and model-agnostic (Claude, GPT, Gemini, or a local Ollama model), so you're not locked into one AI provider. The catch: you pay for whatever inference credits you consume through your own API key, so a big refactor can cost more than a flat subscription would, and it's an editor extension rather than a full IDE like some competitors — you need an editor already set up.
Continue: open-source, but frozen in time
Continue is worth knowing about for a specific reason: it's a genuinely open-source (MIT), model-agnostic engine for VS Code, JetBrains and the CLI, with an established community of 35,000+ GitHub stars — and it's completely free. The honest problem is that Continue was acquired by Cursor, and the project has been effectively frozen since (last release v2.0.0, no active development, and its own docs and pricing pages currently return 404 errors). It's still installable and usable today, but there's no clear roadmap for new users, so treat it as a snapshot rather than a tool with a future.
OpenCode: also free, also archived
OpenCode tells a similar story from a different angle. It was a free, open-source terminal coding agent that could plug into 75+ AI providers instead of locking you to one, with multi-session support and shareable session links — popular enough to reach 13,600+ GitHub stars. As of September 2025 it's archived: the team moved on to build a successor called Crush, and OpenCode itself won't receive further updates or security patches. If you found tutorials mentioning it, know that it's a dead end today, not a current pick.
Nanocoder: built by volunteers, not a company
Nanocoder is a free, open-source terminal coding agent maintained by a volunteer community rather than a startup chasing a paid tier. There's no telemetry, no hidden upsell, and you choose whether it runs against a local model (via Ollama) or a cloud API. It supports normal, auto-accept, and "yolo" execution modes plus MCP integration, and installs easily via npm, Homebrew or Nix. The trade-off is exactly what you'd expect from a volunteer project: no commercial support guarantee, you have to configure your own model access, and it's less polished than a funded commercial product.
Zencoder: treats a fix as a workflow, not a chat
Zencoder takes a different approach entirely: instead of answering chat questions, it treats a feature or bug fix as a full workflow — planning, coding, testing and review — and its "Zenflow Work" feature can automate tasks across 100+ external tools like Jira, Slack and Notion. It also orchestrates across multiple models (Claude, GPT, Gemini, Grok) rather than betting on one. It isn't cheap: plans start at $45/month (Pro, 30K credits) and climb to $195/month (Pro Max, 180K credits), and because it's credit-based, heavy usage can burn through a plan faster than a flat-rate tool would.
AskCodi: an "AI CTO" that manages a team of agents
AskCodi started as a straightforward in-editor coding helper (VS Code, PyCharm, IntelliJ) and has since added an "AI CTO" mode that runs a small team of coding agents inside a Mac app — closer to managing a junior dev team than writing every line yourself. It also offers an OpenAI-compatible orchestration layer for building reusable "virtual models." The clearest downside is transparency: there's no public pricing available at the time of writing, and independent information about the company (founding date, funding) is limited, so budgeting for it means signing up first and finding out.
| Tool | Best for | Price | Open source |
|---|---|---|---|
| GitHub Copilot | The safe, well-supported default | $10/mo (individual) | No |
| Cline | Autonomous multi-file edits, any model | Free + your own API usage | Yes |
| Continue | Trying a frozen but still-functional OSS engine | Free (no active development) | Yes |
| OpenCode | Historical reference only — archived | Free (archived) | Yes |
| Nanocoder | No telemetry, community-run, local models | Free | Yes |
| Zencoder | Full plan-code-test-review workflows | $45–$195/mo | No |
| AskCodi | Managing a small team of coding agents | Not published | No |
There's no single winner here, because these tools aren't solving quite the same problem. If you just want Copilot's job done for free, Cline and Nanocoder are the two actually-maintained open-source options worth trying today — Continue and OpenCode are honest historical mentions, not current recommendations, since both have stopped moving forward. If your budget allows for more than autocomplete and you want an agent that plans, tests and touches your other tools, Zencoder is the more mature paid pick over AskCodi, whose pricing opacity makes it hard to commit to sight unseen.