| Field | Xcode 6.3 Beta 4 | Xcode 6.3.1 | Diff |
|---|---|---|---|
| Release type | Beta 4 | stable | different |
| Edition | - | - | same |
| Release date | 2015-03-24 | 2015-04-21 | different |
| Minimum macOS | 10.10 | 10.10 | same |
| Swift | unknown | 1.2 | different |
| iOS SDK | unknown | unknown | same |
| Build | 6D554n | 6D1002 | different |
建议：如果你是生产环境主力开发，优先选择 stable 版本；如需验证新 SDK，再考虑 beta。