Developer & IT

Developer utilities that keep data on your machine: JWT decoding, UUIDv7 and ULID, epoch timestamps, cron schedules, IPv4/IPv6 subnets, OKLCH colors, CSS clamp() and SLA budgets.

• CIDR subnet calculatorFind network ranges, masks, address counts, equal subnets, and IP membership for IPv4 or IPv6.
• Cron expression explainerExplain five-field cron syntax and preview upcoming run times in an IANA time zone.
• CSS clamp generatorGenerate fluid font sizes with px or rem endpoints and inspect the interpolation math.
• JWT DecoderDecode JWT claims locally and inspect expiration dates without uploading a token.
• OKLCH color converterConvert CSS colors, preview sRGB fallbacks and check WCAG text contrast.
• SLA uptime & downtime calculatorTurn an availability target like 99.9% into allowed downtime per day, month and year.
• Unix Timestamp ConverterConvert Unix timestamps and ISO dates in batches with exact nanosecond arithmetic.
• UUIDv7 Generator and UUID / ULID DecoderGenerate secure random UUIDv7 or ULID batches and inspect embedded timestamps.