# Fission vs Vercel Functions

**Leader by Vioscale score:** Vercel Functions

| Attribute | Fission | Vercel Functions |
|---|---|---|
| **Vioscale score** | 53.5 (54% (medium)) | 91.9 (61% (medium)) |
| activity.commits_last_30d | 60 | - |
| adoption.dependent_repos | 3 | - |
| adoption.github_stars | 8,913 | - |
| deployment.options | `{"cloud":true,"on_prem":true,"self_hosted":true}` | `{"cloud":true}` |
| description.long | Developers write short-lived functions that are triggered by HTTP requests or events, while the framework handles Kubernetes infrastructure management automatically. This eliminates the need to manually build containers or manage registries. | Serverless function execution with automatic optimization, multi-runtime support (Node.js, Python, Go, etc.), regional deployment options, and built-in observability for monitoring invocations and costs. |
| features.capabilities | `{"hosting":"both","triggers":"HTTP and event triggers","languages":"Python, NodeJS, Go, Rust, C#, PHP (extensible to any language)","cold_start":"provisioned","cli_and_iac":true,"http_trigger":true,"scale_to_zero":true,"custom_runtime":true,"edge_distributed":false,"runtime_substrate":"container","observability_builtin":true}` | `{"hosting":"cloud","triggers":"HTTP (GET, POST)","languages":"Node.js, Python, Go, and more","cold_start":"low","cli_and_iac":true,"http_trigger":true,"scale_to_zero":true,"edge_distributed":true,"observability_builtin":true}` |
| integrations.count | 6 | - |
| integrations.list | `[{"name":"Kubernetes"},{"name":"Istio"},{"name":"Fluentd"},{"name":"Prometheus"},{"name":"Grafana"},{"name":"MCP"}]` | - |
| language.primary | Go | - |
| license.spdx | Apache-2.0 | - |
| platform.support | `{"cli":true}` | `{"cli":true,"web":true}` |
| pricing | `{"type":"open_source","summary":"Free, open source under Apache License","freeTier":true,"sourceUrl":"https://fission.io","retrievedAt":"2026-08-14T09:18:36.308Z"}` | `{"type":"usage","plans":[{"free":true,"name":"Hobby","components":[{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"contactSales":false,"includedLimits":{"active_cpu":"4 hours/month","invocations":"1 million/month","provisioned_memory":"360 GB-hrs/month"}},{"free":false,"name":"Pro","description":"Pay-per-use consumption beyond Hobby plan limits","contactSales":false}],"summary":"Free Hobby tier with monthly included usage; Pro tier with usage-based billing","currency":"USD","freeTier":true,"sourceUrl":"https://vercel.com/docs/functions","retrievedAt":"2026-08-01T15:44:05.076Z","billingPeriods":["month"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | open_source | commercial |
| pricing.price_level | free | low |
| pricing.transparent | yes | yes |
| release.cadence_days | 24 | - |
| release.history | `[{"url":"https://github.com/fission/fission/releases/tag/v1.27.0","date":"2026-06-22T15:02:22Z","type":"stable","version":"v1.27.0"},{"url":"https://github.com/fission/fission/releases/tag/v1.26.0","date":"2026-06-13T11:47:51Z","type":"prerelease","version":"v1.26.0"},{"url":"https://github.com/fission/fission/releases/tag/v1.25.0","date":"2026-06-05T11:49:37Z","type":"stable","version":"v1.25.0"},{"url":"https://github.com/fission/fission/releases/tag/v1.24.0","date":"2026-05-26T19:01:42Z","type":"prerelease","version":"v1.24.0"},{"url":"https://github.com/fission/fission/releases/tag/v1.23.0","date":"2026-05-15T04:57:05Z","type":"stable","version":"v1.23.0"},{"url":"https://github.com/fission/fission/releases/tag/v1.22.0","date":"2025-12-18T17:01:59Z","type":"stable","version":"v1.22.0"},{"url":"https://github.com/fission/fission/releases/tag/v1.22.0-rc2","date":"2025-12-15T11:49:48Z","type":"prerelease","version":"v1.22.0-rc2"},{"url":"https://github.com/fission/fission/releases/tag/v1.21.0","date":"2025-01-25T16:56:09Z","type":"stable","version":"v1.21.0"},{"url":"https://github.com/fission/fission/releases/tag/v1.21.0-rc2","date":"2025-01-24T05:32:02Z","type":"prerelease","version":"v1.21.0-rc2"},{"url":"https://github.com/fission/fission/releases/tag/v1.21.0-rc1","date":"2025-01-15T17:44:45Z","type":"prerelease","version":"v1.21.0-rc1"},{"url":"https://github.com/fission/fission/releases/tag/v1.20.5","date":"2024-10-04T13:27:46Z","type":"stable","version":"v1.20.5"},{"url":"https://github.com/fission/fission/releases/tag/v1.20.4","date":"2024-09-02T12:14:30Z","type":"stable","version":"v1.20.4"},{"url":"https://github.com/fission/fission/releases/tag/v1.20.3","date":"2024-08-09T10:32:49Z","type":"stable","version":"v1.20.3"},{"url":"https://github.com/fission/fission/releases/tag/v1.20.2","date":"2024-05-27T13:41:29Z","type":"stable","version":"v1.20.2"},{"url":"https://github.com/fission/fission/releases/tag/v1.20.1","date":"2024-01-15T04:59:55Z","type":"stable","version":"v1.20.1"},{"url":"https://github.com/fission/fission/releases/tag/v1.20.0","date":"2023-11-30T16:29:49Z","type":"stable","version":"v1.20.0"},{"url":"https://github.com/fission/fission/releases/tag/v1.20.0-rc2","date":"2023-11-27T10:57:09Z","type":"prerelease","version":"v1.20.0-rc2"},{"url":"https://github.com/fission/fission/releases/tag/v1.20.0-rc1","date":"2023-10-30T14:51:08Z","type":"prerelease","version":"v1.20.0-rc1"},{"url":"https://github.com/fission/fission/releases/tag/v1.19.0","date":"2023-05-19T04:32:34Z","type":"stable","version":"v1.19.0"},{"url":"https://github.com/fission/fission/releases/tag/v1.19.0-rc2","date":"2023-05-12T06:15:59Z","type":"prerelease","version":"v1.19.0-rc2"}]` | - |
| reliability.sla_pct | - | 99.99 |
| reliability.status_page | - | yes |
| security.disclosure_policy | - | yes |
| security.gdpr | - | yes |
| security.hipaa | - | yes |
| security.iso27001 | - | yes |
| security.pci | - | yes |
| security.scorecard | 7.7 | - |
| security.soc2 | - | yes |
| security.vulnerabilities | `{"count":18,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Ffission%2Ffission&per_page=100","last_12m":18,"max_severity":"CRITICAL"}` | - |

## Capabilities (Serverless & Edge Platforms)

| Capability | Fission | Vercel Functions |
|---|:--:|:--:|
| **Core** |  |  |
| Execution substrate | Container | - |
| Language / runtime breadth | Python, NodeJS, Go, Rust, C#, PHP (extensible to any language) | Node.js, Python, Go, and more |
| **Reach** |  |  |
| Runs at global edge PoPs | ✗ | ✓ |
| **Scale** |  |  |
| Scale to zero | ✓ | ✓ |
| **Performance** |  |  |
| Cold-start profile | Provisioned concurrency | Low |
| **Limits** |  |  |
| Max execution duration | - | - |
| **Integration** |  |  |
| Event source breadth | HTTP and event triggers | HTTP (GET, POST) |
| HTTP endpoint trigger | ✓ | ✓ |
| Cron / scheduled invocations | - | - |
| **State** |  |  |
| Durable state / workflow primitive | - | - |
| **Flexibility** |  |  |
| Bring-your-own runtime / container | ✓ | - |
| **Deployment** |  |  |
| Hosting | Cloud + self-hosted | Cloud only |
| **Ops** |  |  |
| Built-in logs / metrics / tracing | ✓ | ✓ |
| **Extensibility** |  |  |
| CLI + IaC / framework support | ✓ | ✓ |

*Source: Vioscale. Generated 2026-09-01T14:55:50.954Z. "-" = undocumented, not absent.*