Floci
Fast local AWS emulator and LocalStack replacement — native startup around 24 ms, idle memory around 13 MiB, no account/auth token/feature gates, and real Docker-backed execution where fidelity matters.
Open-source MIT AWS emulator: floci-io/floci. It gives AWS-shaped services on http://localhost:4566 without requiring a cloud account, auth token, or paid feature gates. The official site artifact still says 65 AWS services, 24 ms startup, no auth token, while the current README says 68 AWS services. Treat the exact service count as a fast-moving release fact and verify the specific service before relying on parity. Source: floci.io/aws, 2026-07-03; floci README, 2026-07-03
When to reach for it
| Scenario | Floci vs alternatives |
|---|---|
| CI without Docker pull | Floci binary vs LocalStack container |
| Laptop integration tests | Floci vs aws SSO against dev account |
| Full AWS parity / edge cases | Real dcs profile or LocalStack when Floci gaps |
| Mac Linux containers | Apple Container (Container Machines) for OCI — different layer |
Viral signal: @heygurisingh "13 MiB, 45 services, <1s boot" (1,888 likes, 2,752 bookmarks). The original X image URL returned 403 during the July 3 media repair, so the local artifact uses Floci's official AWS OG image instead. That matters because the viral count is historical, while the official site/README have since moved the service count forward. Source: X/@heygurisingh, 2026-05-10; Source: local media repair, 2026-07-03
Current Release Snapshot
Current source snapshot as of 2026-07-03: floci-io/floci, default branch main at 6d9edfe6951a7014e4d90d3f5c7830c4f21626dd, release 1.5.30 published 2026-07-03 at the same commit, MIT license, 14,744 stars, 1,477 forks. Quickstart is floci start, then eval $(floci env), with standard AWS clients pointed at http://localhost:4566. Heavyweight services such as Lambda, RDS, Neptune, ElastiCache, MSK, ECS, EC2, EKS, OpenSearch, and CodeBuild use real Docker-backed execution where shallow mocks would reduce fidelity. Source: GitHub API, GitHub Releases, git ls-remote, README, 2026-07-03
Stack fit (Kevin)
- Dedalus DCS dev — default local AWS-shaped tests before hitting
dcsSSO; pair with integration tests in monorepo. - Agent-written AWS code — agents can run
floci+ SDK against localhost without provisioning cloud resources. - CI cost — prefer over Docker-heavy LocalStack when service coverage suffices.
- Enforced routing:
config/cursor/rules/tool-hierarchy.mdcAWS row (#2 after real CLI).
Install: see github.com/floci-io/floci releases.
Timeline
- 2026-06-13 | Quality remediation: tier 1 promotion, CI/Dedalus stack fit, comparison table. Source: Agent, 2026-06-13
- 2026-05-11 | Added to wiki + SKILL-RESOLVER / tool-hierarchy. Source: User, 2026-05-11
- 2026-05-10 | Viral relaunch signal on X. Source: X/@heygurisingh, 2026-05-10
- 2026-07-03 | Re-reviewed current release/source state and repaired the missing visual artifact with Floci's official AWS OG image after the original X CDN image returned 403. Updated the page from the old 45-service tweet claim to current 65/68 service-count surfaces,
1.5.30, and Docker-backed fidelity details. Source: GitHub and floci.io/aws, 2026-07-03