Anyone juggling several Oracle Cloud accounts knows the tab-switching ritual; OCI Core ends it by pulling every tenancy's instances into one self-hosted panel. The cross-account list shows state, shape, volumes, and public IPs for each machine, and you can start, stop, resize, rename, or terminate instances without opening Oracle's console. A creation wizard offers every shape in an availability domain, not just the free presets, while long operations such as IP swaps, resizes, and terminations run as background jobs with visible progress. Capacity hunting watches Oracle's read-only capacity reports and retries creation until a scarce shape appears, notifying you when it lands. Networking tools edit VCNs, subnets, and security rules visually, swap public IPs, enable IPv6, and manage extra network cards. Storage views resize boot and block volumes, and a rescue mode moves a broken system disk to a healthy machine for repair. Billing breaks spend down by service and region, tracks the monthly free egress allowance, and shows real usage for free-tier accounts. Accounts are checked for connectivity, quotas, and credential health, with emails, IPs, and OCIDs masked by default and revealed only on demand. Alerts reach Telegram, WeCom, DingTalk, email, or webhooks, and access is guarded by argon2id passwords, TOTP two-factor sign-in, session controls, and an audit log. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.