About jslet

🎯 Mission

jslet builds free, client-side tools for developers and engineers — from JSON formatters and regex testers for frontend devs, to cloud cost calculators and SRE estimators for infrastructure teams.

Every tool runs entirely in your browser. No data collection. No tracking. No sign-up walls. No AI training on your inputs. Just practical utilities that work, fast.

🔧 What We Build

🟢 JS Developer Tools: JSON / CSV converters, regex visualizers, Base64 encoders, timestamp tools, CSS gradient editors, and other daily-driver utilities for frontend and full-stack developers.

🔵 Cloud Engineering Calculators (75+ tools across 8 categories):

Cloud Economics — NAT gateway cost, Lambda pricing, RI vs. Spot breakeven analysis.
SRE / Availability — SLA calculators, latency budget planners, observability cost estimators.
LLM Infrastructure — GPU training cost, VRAM estimators, API pricing calculators.
Storage & Network — RAID config analyzer, CDN cache hit ratio, IOPS→throughput, VPN overhead.
Security & DevOps — Password entropy estimators, cron frequency calculators, K8s resource planners.

Tech-Intel Briefings: In-depth analytical reports on infrastructure-scale phenomena — AI traffic inversion, CDN economics, DNS propagation dynamics, and other under-discussed forces reshaping the operational surface of the internet.

👤 Team

jslet is built and maintained by a small crew of engineers who've put in years across cloud architecture, SRE, and software development. We build these tools because we reach for them ourselves.

No founder worship. No venture-backed growth deck. The work speaks. If a tool saves you an outage or a briefing spots a pattern six months before the herd, that's the metric.

📬 Contact

We welcome substantive technical correspondence. Bug reports with repro steps. Suggestions for new tools. Topic proposals for future briefings. Corrections when an analysis missed a beat.