Tools

Developer tools, capacity calculators, and distributed-systems visualizers that run entirely in your browser.

Developer utilities

• UUID Generator — Generate RFC 4122 version 4 UUIDs instantly.
• Snowflake / ULID ID Generator — Sortable distributed IDs with Snowflake decode.
• JWT Decoder — Decode JWT header and payload locally.
• Base64 Encoder Decoder — Encode and decode Base64 text.
• Hash Generator — Generate MD5 and SHA hashes.
• Regex Tester — Test regex patterns and inspect matches.
• JSON Comparer — Compare two JSON documents side by side.
• JSON Formatter / Validator — Beautify, minify, and validate JSON with error positions.
• YAML ↔ JSON Converter — Convert Kubernetes manifests and configs both ways.
• SQL Formatter — Pretty-print SQL with keyword casing and indentation.
• JSON to Go Struct Converter — Paste JSON, get typed Go structs with tags.
• Go Struct Tag Generator — Add json / bson / validate tags to structs.
• XML Comparer — Compare two XML documents after normalization.
• XML Formatter — Beautify or minify XML.
• CIDR / Subnet Calculator — Network, broadcast, hosts, and subnet splits.
• Epoch Converter — Convert epoch timestamps and human-readable dates.
• Cron Helper — Validate cron expressions and preview next runs.
• Log Anonymizer / PII Scrubber — Strip IPs, emails, and API keys from logs in the browser before you share them.

Capacity & cost calculators

• Kafka Partition Calculator — Size partitions from throughput, consumers, and retention.
• Redis Memory Estimator — Estimate RAM for keys, structures, fragmentation, and replicas.
• MongoDB Index Size Estimator — WiredTiger index size for compound, multikey, TTL.
• API Gateway Cost Calculator — Estimate AWS API Gateway monthly spend.
• AWS Lambda Cost Calculator — Estimate Lambda compute and request costs.
• Kubernetes Resource Calculator — Convert pod requests into node count.
• Sharding Calculator — Choose shard count from storage and QPS.
• Database Index Size Estimator — Approximate B-tree secondary index size.
• QPS Estimator — Convert DAU into average and peak QPS.
• CDN Bandwidth Calculator — Estimate CDN egress, origin fetch, and savings.

Distributed systems visualizers

• Consistent Hashing Visualizer — Interactive hash ring with virtual nodes and key placement.
• Quorum NWR Visualizer — Simulate N/W/R writes, reads, and replica failures.
• Kafka Consumer Group Visualizer — Partition assignment, rebalance, and lag.
• Raft Leader Election Visualizer — Terms, timeouts, and majority votes until a leader emerges.
• Kafka Produce Path Visualizer — Key → partition → leader → ISR, with under-replication scenarios.
• CAP Theorem Visualizer — Choose CP vs AP under a network partition.
• Two-Phase Commit vs Saga Visualizer — Step through prepare/commit vs compensations on failure.
• Rate Limiting Visualizer — Token bucket, leaky bucket, and sliding window under bursts.
• Load Balancer Visualizer — Round-robin, least-connections, and weighted backends.
• Cache Eviction Visualizer — LRU vs LFU vs TTL on the same access pattern.
• Bloom Filter Visualizer — Inserts, queries, and estimated false-positive rate.
• Merkle Tree Sync Visualizer — Diff two replicas and sync only mismatched leaves.
• Vector Clocks Visualizer — Detect happens-before vs concurrent updates.
• Gossip Protocol Visualizer — Epidemic spread of membership state across nodes.
• Backpressure Visualizer — Producer/consumer mismatch with drop, block, or slow-down.
• Outbox Pattern Visualizer — Dual-write vs transactional outbox for reliable events.
• Exponential Backoff & Jitter Visualizer — Full / equal / decorrelated jitter vs thundering herds.
• Idempotency Key / Dedup Visualizer — Retries with and without idempotency keys.