Best Semaphore CI Alternatives in 2026

People leave Semaphore for a bigger ecosystem or to put CI next to their code. For GitHub teams that usually means GitHub Actions, optionally on faster runners such as compiler.dev. CircleCI is the nearest hosted rival, and Buildkite fits teams that want agents on their own machines. Prices were checked in October 2026.

Why teams look for alternatives to Semaphore

• Smaller ecosystem. Actions has a very large marketplace of reusable steps; Semaphore has fewer shared building blocks, so you write more yourself.
• CI lives away from the pull request. On GitHub, staying in one product means fewer permissions, secrets and dashboards.
• Extras are separate line items. Per its pricing page, a Dedicated Cache Server is $400 a month and a Private Docker Registry is $400 a month, and support starts at $50 a month (Basic), up to $750 (SLA Premium).
• Per-minute x64 price. Ubuntu x64 2 vCPU is $0.0075/min and 4 vCPU $0.015/min, above GitHub's 2-core $0.006/min list price.
• Free tier is credit-based. $15 a month, about 2,000 Ubuntu 2 vCPU minutes, with 20 concurrent jobs by default.
• Hiring. More candidates have used GitHub Actions or Jenkins.

Semaphore strengths: no plan tiers, cheap Arm (2 vCPU $0.003/min), self-hosted agents at $0.0025/min on any machine, and a pipeline model with good parallelism.

Quick picks

The alternatives

GitHub Actions

Workflows next to the code, with 2-core Linux at $0.006/min and 8-core at $0.022/min. Free minutes depend on plan. Tradeoff: Arm costs more than Semaphore's $0.003 (GitHub Arm 2-core is $0.005/min), and hosted machines are modest.

GitHub Actions on compiler.dev

One line, runs-on: [self-hosted, Linux, compiler-ci], runs Actions jobs on a fresh 8 vCPU / 16 GB VM at $0.012/min, from prepaid credit that never expires, falling back to your original runners if anything fails. It is a runner service, not a CI system, so it needs GitHub. See benchmarks: median 1.5× faster across 18 measured stacks (15 faster, 2 the same, 1 slower) than GitHub-hosted. No Arm, no Windows.

CircleCI

The nearest hosted alternative: 30,000 free credits a month, Performance from $15 a month at $0.0006 a credit, Linux Medium at 10 credits a minute. Credits expire monthly. See CircleCI alternatives.

Buildkite

Pro at $30 per active user a month, agents you host (10 included, then $3.50 each), hosted Linux at $0.004 per vCPU minute. Better at large scale; costs more for small teams.

GitLab CI

400 free compute minutes, Premium $29 per user a month with 10,000. Makes sense if your repo is on GitLab.

Jenkins

Free software, no vendor, and the most control. It also means you run it; see its advisories, 12 in 2025.

How to choose

1. If code is on GitHub, price Actions first with the cost calculator.
2. If you use Arm heavily, keep Semaphore's $0.003 rate in mind before switching.
3. If you use the cache server or registry add-ons, count their $400 each in the comparison.
4. Check GitHub Actions pricing for plan-specific free minutes.

Migration notes

Semaphore's blocks and jobs map to Actions jobs:

# .semaphore/semaphore.yml
version: v1.0
name: ci
agent:
  machine:
    type: e1-standard-2
    os_image: ubuntu2204
blocks:
  - name: test
    task:
      jobs:
        - name: unit
          commands:
            - checkout
            - npm ci
            - npm test

# .github/workflows/ci.yml
name: ci
on: [push, pull_request]
jobs:
  test:
    runs-on: [self-hosted, Linux, compiler-ci]
    steps:
      - uses: actions/checkout@v4
      - run: npm ci && npm test

Blocks become jobs, promotions become environments or workflow_dispatch, cache commands become actions/cache (see caching), and secrets move to GitHub secrets. Semaphore's job parallelism maps to matrices and test sharding (guide). Keep both running for a week. For the full comparison with compiler.dev, see Semaphore vs compiler.dev.

FAQ

What is a cheaper Semaphore alternative?

For GitHub projects, Actions at $0.006/min for 2-core Linux is lower than Semaphore's $0.0075/min x64. Semaphore stays cheaper for Arm.

Does Semaphore have a free tier?

$15 of credit a month, about 2,000 Ubuntu x64 2 vCPU minutes.

Can I keep my own agents elsewhere?

Yes: Semaphore itself, Buildkite, Jenkins or GitHub self-hosted runners.

Is it hard to migrate?

Usually hours for small projects. Promotions and custom images take longer.