GitHub Actions vs GitLab CI vs CircleCI vs Buildkite: The 2026 CI/CD Decision Guide

Every team eventually asks the same question. Which CI/CD platform should we actually use? The honest answer depends on two things: where your code already lives, and how many minutes you burn every month. This guide compares GitHub Actions, GitLab CI, CircleCI, and Buildkite on pricing and free tiers. It also covers where Cloudflare, Vercel, and Netlify fit in. Their bundled build systems cover a lot of teams without a separate CI tool at all.

I’m not going to tell you there’s one correct answer. I’m going to show you the actual numbers. Then you can do the math for your own team. All pricing below is verified against each vendor’s own documentation as of September 2026.

Table of Contents

1. The Short Version
2. GitHub Actions
3. GitLab CI
4. CircleCI
5. Buildkite
6. Deploy-Platform Build Systems: Cloudflare, Vercel, and Netlify
7. Side-by-Side Pricing Table
8. Hidden and Secondary Costs
9. Which One Should You Pick?
10. Frequently Asked Questions (FAQ)
11. Conclusion
12. References

1. The Short Version

If your code is already on GitHub and your builds are small, GitHub Actions is the easy default. If you’re already paying for GitLab’s source control, GitLab CI comes bundled and avoids a second vendor. CircleCI is worth a look if you want a credit-based model that isn’t tied to a specific Git host. Buildkite makes sense once your build volume gets high enough that per-minute pricing starts to hurt. You bring your own compute and pay a flat seat fee instead.

None of these are wrong choices. The difference shows up in your invoice, not in your YAML file. For pure open-source or public-repo work, GitHub Actions is usually the clear cost winner. Public repositories run free on every plan, with no minute cap.

2. GitHub Actions

GitHub Actions is the default for any team already hosting code on GitHub. It runs directly off your existing repository and uses the same permissions model. It also has the largest marketplace of reusable actions of any platform here.

Free minutes per month:

• GitHub Free: 2,000 minutes
• GitHub Pro: 3,000 minutes
• GitHub Team ($4/user/month): 3,000 minutes
• GitHub Enterprise Cloud (from $21/user/month): 50,000 minutes

Public repositories get unlimited Actions minutes on every plan.

Overage pricing for hosted runners (standard 2-core, per minute):

• Linux: $0.006
• Windows: $0.010
• macOS: $0.062

There’s also a cheaper Linux 1-core runner at $0.002 per minute, for jobs that don’t need the extra core.

GitHub cut these overage rates in January 2026. Linux dropped from $0.008 to $0.006 per minute, and macOS fell from $0.080 to roughly $0.062. Linux minutes are now priced the same as CircleCI’s standard Linux compute. For teams on both platforms, seat cost ends up being the real differentiator.

The multiplier catch: those free minute pools aren’t consumed at the same rate on every OS. GitHub applies a multiplier against your free quota: Linux counts as 1x, Windows as 2x, and macOS as 10x. So the 2,000 free minutes on GitHub Free are really only about 1,000 minutes of Windows time. Or roughly 200 minutes of macOS time, if that’s all you run. This catches teams off guard more than the published per-minute rate does. The rate looks reasonable right up until the free quota disappears in a fraction of the wall-clock time they expected.

One more wrinkle: “larger runners” (the bigger machine sizes, beyond the standard 2-core) never draw from the free quota at all, on any plan or repo type. They’re billed at the per-minute rate from the very first minute.

3. GitLab CI

GitLab CI ships built into GitLab. That matters if you’re already using GitLab for source control, issues, and merge requests. You don’t add a second tool to your stack; CI/CD is just another tab.

Compute minutes per month:

• Free: 400 minutes
• Premium ($29/user/month): 10,000 minutes
• Ultimate (custom pricing): 50,000 minutes

Overage cost: the base rate is $0.010 per minute, but this is not a flat rate regardless of runner OS. GitLab uses cost factors that multiply how fast a job consumes your compute-minute pool:

A macOS job on GitLab effectively costs $0.06 to $0.12 per minute once the cost factor is applied, not the $0.010 base rate. This is the opposite of what it looks like at first glance. GitLab’s per-minute price is the lowest of any platform here, but its non-Linux runners can end up among the most expensive once the multiplier is factored in.

The one genuine advantage this setup creates: self-hosted GitLab runners consume zero compute minutes, on every tier, including Free. If you’re willing to run your own runners, GitLab’s compute-minute pricing simply doesn’t apply to you.

The 400 free minutes on GitLab’s Free tier are noticeably tighter than GitHub’s 2,000. That’s the first thing small teams notice if they migrate a private repository over.

4. CircleCI

CircleCI uses a credit system instead of a straight per-minute price. It takes a bit of getting used to, but ends up flexible once you understand the conversion.

Plans:

• Free: 30,000 credits/month (roughly 3,000 Linux Medium minutes), 5 active users, no credit card required
• Performance (from $15/month): 30,000 included credits, expandable seats at $15/user, 80x concurrency
• Scale: custom annual pricing, unlimited concurrency, 24/7 support

Credit conversion: Linux Medium compute runs about 10 credits per minute. So 30,000 credits works out to roughly 3,000 minutes, similar to GitHub’s Pro tier. Additional credits cost $15 per 25,000 on paid plans.

Credits don’t all behave the same way. Free-plan credits expire monthly and don’t roll over; if you don’t use them, you lose them. Paid credits do roll over month to month, but expire after a year. Open-source projects get a separate, much larger pool: up to 400,000 credits a month for Linux, Arm, and Docker builds, plus 30,000 credits for macOS and Windows builds. That’s a genuinely generous allowance compared to the standard free tier.

CircleCI’s advantage is that it isn’t tied to a specific Git host. If your team is split across GitHub and Bitbucket, or you’re not ready to commit fully to one host’s CI product, CircleCI plugs into either without forcing a migration.

5. Buildkite

Buildkite takes a different approach entirely. You bring your own compute (your own servers, cloud VMs, or containers), and Buildkite just orchestrates the pipeline. That means your build minutes aren’t metered by Buildkite at all, unless you use their managed hosted agents.

Plans:

• Free: up to 5 users, 30-day full-access trial, plus roughly 2,000 Linux vCPU-minutes/month on hosted agents (Small instance size only) with limited concurrency
• Pro ($30/user/month, up to 50 users): includes 4,000 Linux vCPU minutes/month on hosted agents
• Enterprise: custom pricing, unlimited users (30-user minimum)

The Free tier is easy to misread as purely bring-your-own-compute. It isn’t. It comes with a real, if modest, slice of hosted Linux compute too, so you can evaluate Buildkite without standing up your own runners first.

Hosted agent overage (if you don’t self-host runners):

• Linux: $0.004 per vCPU minute ($0.008/min small, $0.016/min medium, $0.032/min large)
• Mac: $0.02 per vCPU minute ($0.12/min M4 Medium, $0.24/min M4 Large)

Buildkite bills per seat rather than per build minute when you self-host your own agents. Because of that, a high-volume team running thousands of builds a day can end up paying far less than they would on a purely metered platform. The tradeoff is that you need the operational capacity to manage your own runner infrastructure. Self-hosted agents with unlimited minutes remain the platform’s core value proposition, especially at high volume.

6. Deploy-Platform Build Systems: Cloudflare, Vercel, and Netlify

The four platforms above are general-purpose. They’ll build, test, and deploy your code anywhere. Cloudflare, Vercel, and Netlify are a different category. Each bundles a build system directly into its hosting product, triggered by a git push. It exists to get your site or Worker deployed on that specific platform, not to run an arbitrary pipeline. If you’re already deploying to one of these, its built-in build system may be all the CI you need, with no separate tool to configure.

Cloudflare (Workers Builds / Pages Builds):

• Workers Builds: 3,000 free build minutes/month, 6,000/month on paid plans, with overage at $0.005/minute.
• Pages Builds: metered by build count rather than minutes. 500 builds/month on Free, 5,000 on Pro, 20,000 on Business, with a 20-minute timeout per build and only 1 concurrent build on the Free tier.
• Static assets served from Pages are free and unlimited; only Pages Functions and Workers requests are billed under Workers pricing.

Vercel:

• Hobby (free): unlimited deployments, builds run on Basic machines at no charge.
• Pro ($20/month): builds are billed per minute by machine tier, from $0.007/minute on Basic up to $0.105/minute on Turbo machines. A monthly usage credit absorbs light usage before real charges kick in.

Netlify:

• Free: a 300-credit monthly allowance, covering deploys, compute, and bandwidth together rather than build minutes specifically.
• Pro ($20/month, unlimited team members as of April 2026): 3,000 credits/month. A production deploy costs 15 credits, and compute is billed at 10 credits per GB-hour. Credits get consumed by deploy frequency and app resource usage together, not purely build time.

Where this fits: none of these three are a substitute for GitHub Actions or GitLab CI. Not if you need to run an arbitrary test suite, build a Docker image, or deploy to infrastructure these platforms don’t host. But say your project is a static site or a Worker/Function that deploys straight to Cloudflare, Vercel, or Netlify. And say your CI needs stop at “build it and ship it.” Then their bundled systems cover that job, with no second tool needed. It’s the same argument that makes GitLab CI appealing if you’re already on GitLab.

7. Side-by-Side Pricing Table

8. Hidden and Secondary Costs

The per-minute or per-credit rate is rarely the whole bill. A few costs don’t show up in the headline pricing, but matter at real scale:

• Storage and artifacts. All four platforms charge separately for build artifact storage beyond a modest included allowance. This adds up fast for projects that archive large build outputs or Docker layers on every run.
• Network egress. Pulling large dependencies or pushing container images across regions can add bandwidth charges. This is particularly true on cloud-hosted runners that aren’t in the same region as your artifact registry.
• Larger and GPU runners. Every platform here prices bigger machines and GPU instances well above the standard runner rate. On GitHub specifically, these larger runners never draw from your free quota at all.
• Support tiers. Free and entry-level paid plans generally include community or best-effort support only. Priority response times and dedicated support are usually reserved for the top-tier or custom-priced plans on all four platforms.

None of these costs are hidden in the sense of being undisclosed. But they’re easy to miss when you’re comparing headline per-minute rates. They’re often where a CI/CD bill quietly grows beyond what the pricing calculator first suggested.

9. Which One Should You Pick?

Pick GitHub Actions if: your code already lives on GitHub, your builds are Linux-heavy, and your monthly volume is modest. The 2,000-3,000 free minutes cover most small teams outright. It’s usually the cheapest option for open-source or public-repo work by a wide margin.

Pick GitLab CI if: you’re already using GitLab for source control and want CI/CD without adding another vendor. Or you’re willing to run self-hosted runners, which sidestep the compute-minute pricing (and its cost factors) entirely on every tier, including Free.

Pick CircleCI if: you want a CI platform that isn’t coupled to a single Git host. Or your team already has infrastructure or workflows built around CircleCI’s orbs and config format.

Pick Buildkite if: your build volume is high enough that per-minute billing has become a real cost center, and you have the operational capacity to run your own build agents. As a rough order-of-magnitude rule of thumb, the per-seat model tends to beat metered platforms somewhere around 100,000 build minutes a month. That crossover shifts a lot depending on your seat count, how much of your compute is self-hosted, and how much you actually rely on Buildkite’s own hosted agents. Run your own numbers rather than treating that figure as a hard line.

Pick Cloudflare, Vercel, or Netlify’s bundled builds if: your project deploys straight to that platform and your build needs are simple: build the site or Worker, then ship it. It’s one less tool to configure. The moment you need a real test matrix, multi-target deploys, or anything more elaborate than “build and deploy here,” reach for one of the four general-purpose platforms above instead.

10. Frequently Asked Questions (FAQ)

Is GitHub Actions free for open source projects?

Yes. Public repositories get unlimited Actions minutes on every GitHub plan, including the Free tier. That makes it the default cheapest choice for most open-source work.

Can I use GitLab CI without hosting my code on GitLab?

Not practically. GitLab CI is built around GitLab’s own repository hosting. GitLab can mirror repositories from GitHub, but running CI against an externally hosted repo adds friction most teams don’t bother with.

Does GitLab really charge a flat rate regardless of runner OS?

No. GitLab’s base rate is $0.010 per minute, but it’s multiplied by a cost factor that depends on the runner’s size and OS. That factor ranges from 1x for a small Linux runner up to 12x for a 2XLarge Linux runner or an M2 Pro macOS runner. The effective cost per minute varies a great deal depending on what you run it on.

Does Buildkite host any compute itself?

Yes. Even the Free plan includes a modest allowance of hosted Linux compute, around 2,000 vCPU-minutes on Small instances, and paid plans include more. Buildkite’s core model is still bring-your-own-agent for serious volume, but it isn’t purely self-hosted-only at any tier.

Why is CircleCI priced in credits instead of minutes?

Credits let CircleCI price different resource classes (small, medium, large, GPU, macOS) on a single unified scale. That beats publishing a separate per-minute rate for every possible machine size. The tradeoff is that you have to do the conversion math yourself, and free-tier credits expire monthly rather than rolling over.

Which platform is cheapest for a small team?

For low-volume Linux builds, GitHub Actions on a Free or Team plan is usually cheapest. The included free minutes cover most small teams without ever touching overage pricing. Just watch the OS multiplier if any of that work runs on Windows or macOS runners.

Do I need GitHub Actions or GitLab CI if I’m just deploying a static site to Cloudflare Pages, Vercel, or Netlify?

Often, no. Each of those platforms builds and deploys directly from a git push, with no separate CI tool. Add a dedicated CI/CD platform once you need something their bundled build system doesn’t do: a broader test matrix, a build step that doesn’t end in a deploy to that specific platform, or orchestration across multiple environments.

11. Conclusion

There’s no single best CI/CD platform in 2026. There’s only a best fit for your existing Git host, your build volume, and how much infrastructure you’re willing to manage yourself. GitHub Actions and GitLab CI win on convenience if you already use their source control. CircleCI wins on host independence. Buildkite wins once your build volume is large enough that owning the compute becomes cheaper than renting it by the minute.

Whichever you pick, the real cost driver isn’t the platform’s marketing page. It’s your actual monthly build minutes, multiplied by your actual runner OS mix, factoring in whatever multiplier or cost factor that platform applies to non-Linux runners. Run that math before you commit. And if you’re deploying straight to Cloudflare, Vercel, or Netlify with nothing more exotic than “build it and ship it,” don’t overlook that the simplest answer might already be built into the platform you’re hosting on.

12. References

• GitHub Actions billing documentation
• GitHub Actions runner pricing reference
• GitHub Pricing
• GitLab CI/CD compute minutes documentation
• GitLab Pricing
• CircleCI Pricing
• CircleCI credits documentation
• Buildkite Pricing
• Cloudflare Workers Builds: limits and pricing
• Cloudflare Pages Functions pricing
• Vercel Pricing
• Netlify Pricing