Fly.ioLaunch computers for agents, code sandboxes, and your next app.
vs
SemaphoreThe CI built for coding agents: fast, affordable, and enterprise-ready.
Comparison · CI/CD · weekly run Nov 3
Fly.io vs Semaphore
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Semaphore is the stronger AI pick in CI/CD: it has a visibility score of 6.4 versus 0 for Fly.io.
Choose Fly.io if…
- You need HIPAA (BAA pre-signed on HIPAA package) coverage
- You prefer a larger, established vendor (51–200 employees)
Choose Semaphore if…
- You want the brand AI engines rank higher (6.4 vs 0)
- You want a lower entry price ($0.003 vs $38)
- You need ISO 27001:2022 coverage
- predictable, transparent usage pricing
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Fly.io | Semaphore |
|---|---|---|
| Visibility score | 0% | 6.4% |
| Change vs last week | New | New |
| Rank in CI/CD | #38 | #14 |
| Share of voice | 0% | 1.9% |
| Mentions this run | 0 | 11 |
| Positive in AI answers | — | 40% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Fly.io 0pp · Semaphore 0pp over 0 weekly runs.
Engine by engine
Semaphore leads on 3 of 3 engines
ChatGPT
AI Mode
Perplexity
Fly.ioSemaphore
Head to head in AI answers
0 engine answers name both brands
0Fly.io ranked higher
0Semaphore ranked higher
Features, pricing & fit
| Dimension | Fly.io | Semaphore |
|---|---|---|
| Pricing model | Usage-based | Usage-based |
| Entry price | Free; paid from $38 / mo | Free; paid from $0.003 / mo |
| Free plan | Yes | Yes |
| Deployment | Operated by Fly.io on its own hardware across 18+ regions worldwide, deployed from GitHub or the fly CLI. | Open source, cloud, hybrid or enterprise deployment |
| Compliance | SOC 2 Type 2, HIPAA (BAA pre-signed on HIPAA package) | SOC 2 Type 2, ISO 27001:2022 |
| Support | Community support (free), Paid Standard, Premium and Enterprise support tiers, Dedicated Slack channel on Premium and Enterprise | Free help with account setup, projects and Git integration, Paid Basic, Priority Response, SLA Standard and SLA Premium support plans, On-demand engineering access in blocks of hours |
| Founded | 2017 | 2009 |
| Headquarters | Chicago, Illinois, United States | Novi Sad, Serbia |
| Employees | 51–200 | 11–50 |
| Funding | Seed · $136M raised | PE round, Cypress Ridge Capital |
| Best for | Developers and teams that want to ship apps, AI agents and code sandboxes without managing infrastructure. | Teams that want fast, low-cost CI/CD with pay-as-you-go pricing and the option to self-host open source. |
Plans side by side
Semaphore
Ubuntu ARM 2vCPU$0.003minute
Ubuntu ARM 4vCPU$0.006minute
Ubuntu ARM 8vCPU$0.012minute
Ubuntu x64 2vCPU$0.008minute
Ubuntu x64 4vCPU$0.015minute
MacOS 4vCPU$0.09minute
Self-Hosted (any machine)$0.003minute
Pros and cons
Themes from the AI answers that mention each brand
Fly.io
Profile in progress.
Semaphore
- predictable, transparent usage pricing
- free full-functionality enterprise tier for small teams and startups
- highest G2 review rating among CI/CD tools (4.7/5)
- low-friction integration for GitHub repositories
- scaling costs
- complex matrix requirements
- security track record concerns
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Fly.io vs Semaphore”, https://slateindex.ai/compare/fly-io-vs-semaphore, data of Nov 3, 2026. Licence: CC BY 4.0.