Flux
Fix production bugs by replaying them locally
Flux launched on March 24, 2026 with 105 votes, #425 of 23,380 launches that month and more than 95% of that year's launches.
What it does
Flux records API executions so you can replay failures locally, fix them, and resume execution safely. Instead of guessing from logs, you get the exact request, inputs, and behavior. Same request. Same IO. Same outcome.
Deploy API servers, workers, and backend services to your own VPS with a Vercel-like workflow. Git push deploys, logs, health checks, and rollback — 60% less than managed PaaS. Your data stays on your VPS.
Connect GitHub, run one install command on your VPS. Deploy API servers, workers, and backend services with Git push — then manage logs, health, rollback, and deployments from one workspace. Your infrastructure. No hosting markup. Managed platforms charge 2-4x premium over raw infrastructure. FluxBase lets you keep VPS pricing while adding the operational layer you need. FluxBase pricing = your VPS bill. We charge $0 — free forever. Full pricing → Prices normalized to Vultr VPS specs. Fly.io: $10.70 compute + $0.15/GB vol + $0.02/GB egress + $2 IP. Railway: $20/vCPU + $10/GB RAM + $0.15/GB vol + $0.05/GB egress. Render: published instance pricing + $0.25/GB SSD. How FluxBase compares →…from fluxbase.co
Does a similar job
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Time travel debugger for web development2021 · replay.io · ▲681Automated Penetration Testing for AI-Built Apps
RootCause – Record, Replay and Reproduce JavaScript Errors2018 · therootcause.io · ▲98RootCause helps you track and reproduce javascript errors. You can replay user sessions to avoid extensive troubleshooting and fix application issues in no time.
- UOUnlogged – open-source record and replay for Java2023 · ▲90
Hello HN! Parth, and Shardul here. We have been building unlogged.io for the last 21 months. We started as a time travel debugger and pivoted to record and replay with assertions, mocking, and code coverage. You can save the replays in the form of a JSON and commit them to your git. Both Parth and I come from an e-commerce/payments background where production bugs meant heavy financial losses. Big billion days/Black Friday sales meant months of code freezes with low productivity. Before committing the code, we wanted to replay production traffic and know the breaking changes right…
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