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Developer documentation for every tool — HTTP API reference, multi-language code examples, and MCP integration snippets.
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View allAudio to Text Transcriber (AI)
textAI Tools
Transcribe speech from audio (wav/mp3/m4a/flac/ogg/webm/aac) to text, SRT, VTT or JSON using the grok-stt AI model. Up to 10 minutes.
audio-to-text-transcriberNSFW Image Content Detector
jsonAI Tools
AI-powered image content safety detector using NSFWJS to classify potentially inappropriate content with fallback analysis, supporting GIF/Animated WebP/APNG and JPEG/PNG/WEBP.
nsfw-image-detectorUnicode → ASCII Transliterator
htmlText Processing
Convert any Unicode text to plain ASCII: strip accents (é→e, ñ→n), romanize Cyrillic/Greek, and transliterate Chinese to pinyin (北京→Bei Jing). Drops emojis and symbols that have no ASCII equivalent.
unicode-to-ascii-transliteratorRail Fence (ZigZag) Cipher
htmlText Processing
Encode, decode, visualize, and brute-force the Rail Fence transposition cipher. See the zigzag rail grid and try all rail counts to crack a ciphertext.
zigzag-railfence-textAmino Acid Composition Analyzer
jsonEducation
Per-residue counts and mol%, group tallies, Kyte–Doolittle GRAVY score, and ProtParam MW from a sequence. Educational use only.
amino-acid-compositionDNA Molar Concentration Calculator (µg/mL → nM)
jsonEducation
Mass-to-molar DNA conversion: nM = (µg/mL × 10⁶)/(Da-per-bp × bp) with 650 Da/bp dsDNA and 330 Da/nt ssDNA, plus µM, pmol/µL, total pmol, and molecules/µL via Avogadro. Warns about the µM-vs-nM 1000× slip. NEB NEBioCalculator / Promega BioMath derived. Educational use only.
molar-dna-concentrationNucleic Acid Dilution Calculator (C1V1 = C2V2)
jsonEducation
DNA/RNA working-solution prep: C1V1 = C2V2 mode solves the stock volume V1 = C2V2/C1 plus diluent; 1:X mode gives final concentration C1/X and volumes. Unit-free algebra, pipetting safety advice (<0.5 µL suggests serial dilution), and impossible targets rejected. Sambrook & Russell / Thermo Fisher derived. Educational use only.
nucleic-acid-dilutionOD600 Cell Density Calculator (E. coli)
jsonEducation
OD600 turbidity to cells/mL (1×10⁹ per OD default) and cell dry weight g/L (0.36 per OD, BioNumbers 109837), normalized for dilution factor and path length, with total cells/CDW from the culture volume, per-cell pg CDW, and an OD > 1 linearity flag. Editable strain-specific factors. Agilent/VectorBuilder/BioNumbers derived. Educational use only.
od600-cell-densityOligonucleotide Tm Calculator (Salt-Corrected)
jsonEducation
Classic Tm rules for DNA oligos: Wallace 2(A+T)+4(G+C) under 14 nt and the Sambrook/Primer3 salt formula 81.5 + 16.6·log₁₀[Na⁺] + 0.41×(%G+C) − 600/n from 14 nt, with auto switching, GC%, composition, and both estimates side by side. Wallace 1979 / Sambrook 1989 derived. Educational use only.
oligo-melting-temperature