Bun vs Deno: Modern JavaScript Runtime Release Velocity & Compatibility
Side-by-side engineering comparison of Bun and Deno based on real-time release frequency, average AI impact score, and breaking change ratio.
Partial sample of stable product releases published in the last 90 days. Package releases and prereleases are excluded. Missing releases may affect every metric. No compatibility guarantee is implied.
| Engineering Metric | Bun | Deno |
|---|---|---|
| Category | DEVTOOLS | DEVTOOLS |
| Latest Tracked Version | bun-v1.4.4 (Oct 22, 2026) | v2.9.8 (Oct 21, 2026) |
| Analyzed Releases | 5 tracked updates | 4 tracked updates |
| Average Release Impact Score | 5.0/10 | 5.0/10 |
| Source-flagged Breaking Releases | 0 releases (0%) | 0 releases (0%) |
| Coverage & confidence | Partial sample · 5 releases · 13.5 median days between tracked releases. Compatibility not verified. | Partial sample · 4 releases · 21.1 median days between tracked releases. Compatibility not verified. |
| Actions & Links |
Recent Bun Updates
Bun v1.4
Bun bun-v1.4.0. Source highlight: curl -fsSL https://bun.com/install | bash
Recent Deno Updates
Deno v2.9.8 — Release Notes & Engineering Impact
Deno v2.9.8. Source highlight: fix(compile): check read permission for dynamically imported local files
Deno v2.9.7 — Release Notes & Engineering Impact
Deno v2.9.7. Source highlight: fix(audit): honor configured CA stores (#36728)
Deno v2.9.6 — Release Notes & Engineering Impact
Deno v2.9.6. Source highlight: feat(compressible): add support for 'text/x-component' content type (#36450)
Deno v2.9.5 — Release Notes & Engineering Impact
Deno v2.9.5. Source highlight: feat(add): `--unscoped` flag to alias packages by their unscoped name (#36319)