Free Online Biochemistry & Chemistry Tools
A growing collection of browser-based tools for DNA sequence analysis and chemistry calculations — molar mass, molarity, dilution, pH, equation balancing, an interactive periodic table, and more. No installs, no sign-up — just open and use.
Features
Built for Everyone in Science
Whether you're learning, teaching, or researching, ChemBioTube has tools for you.
For Educators
Bring biochemistry and chemistry to life with interactive visual tools — perfect for lectures, lab prep, and flipped classrooms.
For Students
Study smarter with instant calculators and visual simulations. No sign-up, no ads, no paywalls — just open and learn.
For Researchers
Quick sequence analysis, molarity calculations, plasmid mapping, and 3D structure viewing right in your browser.
Featured Tools
Most-used biochemistry and chemistry calculators — pick one to get started.
DNA Reverse Complement
Compute the reverse complement of a DNA sequence (A↔T, C↔G) instantly.
View allGC Content Calculator
Calculate the GC content percentage and base composition of a DNA sequence.
View allMolar Mass Calculator
Calculate the molar mass of a compound from its chemical formula (e.g. H2O, NaCl).
View allInteractive Periodic Table
Browse all 118 elements. Click for atomic weight, electron shells, density, melting & boiling point, and electronegativity. Temperature slider & property heatmap.
View allChemical Equation Balancer
Balance a chemical equation automatically. Find stoichiometric coefficients (e.g. H2 + O2 -> H2O).
View allpH Calculator
Calculate pH from [H⁺], or from pKa for weak acids and buffers (Henderson-Hasselbalch).
View all
Browse tools by category
Every tool belongs to a subject hub — pick an area to see its full list, or open the top-level index.
- DNA & Nucleic Acid ToolsReverse complement, GC content, primer Tm, PCR setup, gel planning and sequence analysis.15
- Primer Design & QC ToolsDesign primer pairs from a template, check hairpins and dimers, calculate oligo MW and OD yield, and set PCR conditions.7
- Molecular CloningDesign seamless assemblies before you order primers: Gibson, Golden Gate, In-Fusion, Gateway, SLiCE, TA/TOPO and site-directed mutagenesis.7
- Protein ToolsTranslation, molecular weight, isoelectric point, amino acid composition and enzyme kinetics.8
- Cell CultureCounting, plating, growth, media preparation and clonogenic assay calculators for routine culture work.5
- Assays & QuantificationCalibration curves, activity units and quantification calculators for assay readouts.5
- PlasmidsInteractive plasmid designer with restriction sites, ORFs and sequence features.1
- Solution PreparationMake stock and working solutions: molarity, dilution, percent solutions and concentration conversions.6
- Reactions & StoichiometryBalance equations, predict products, and scale reactants to product amounts.6
- Acids, Bases & BufferspH, pKa and Henderson–Hasselbalch buffer calculations for biological systems.3
- Structure & CompositionParse formulas, compute molar mass and elemental composition, browse the periodic table.5
- Lab ConversionsEveryday bench conversions: metric units, centrifuge RPM to g-force and back.2
- Materials ScienceCrystal density, XRD angles, thermal analysis, particle size and battery electrode calculations.6
GeneFlow — Modern Plasmid Editor
A full-featured, browser-based plasmid editor for molecular cloning. Import GenBank/FASTA files, visualize circular and linear maps, run restriction analysis, design cloning workflows, and chat with a built-in AI assistant — all without leaving your browser.
- Circular & linear plasmid maps with zoom, rotate, and minimap
- Restriction enzyme analysis with 200+ common enzymes
- Gel electrophoresis simulation of digestion fragments
- AI assistant for sequence Q&A and cloning design
Plasmid editor — maps, restriction analysis, cloning design
AI protein studio — 3D viewer, sequence & structure analysis
ProteinFlow — AI Protein Structure Studio
A browser-based 3D protein structure studio, comparable to PyMOL. Load PDB/mmCIF/FASTA files, explore structures in multiple representations (cartoon, ball & stick, surface…), inspect sequence and physicochemical properties, and analyze with a built-in AI assistant — no install, no sign-up.
- Real-time 3D rendering with multiple representations & color themes
- Load PDB / mmCIF / FASTA files or by PDB ID
- Sequence view with secondary-structure coloring and property analysis
- AI assistant for structure Q&A and visualization control
ChemLab — Virtual Chemistry Lab in Your Browser
A free browser-based virtual chemistry lab. Run classic middle-school and college inorganic beaker experiments: add reagents to a beaker and watch gas bubbles, precipitates, and color changes — with a built-in compound database. No install, no sign-up.
- 18 curated experiments: gas preparation, displacement, neutralization, ion tests
- Real-time beaker simulation: bubbles, precipitates, color changes & heat
- Built-in compound database — compound info, structure images and formulas
- Free mixing mode to explore any reagent combination
Virtual chemistry lab — beaker experiments & compound database
DNA music synth — turn genes into melodies with AI
DNAMelody — Turn DNA into Music
A browser-based gene music composer. Import any gene, apply DNA-to-music algorithms (nucleotide scale, codon translation, genetic code grid, protein properties, GC rhythm), listen with SoundFont instruments, and compose with an AI agent — no install, no sign-up.
- Five DNA-to-music algorithms inspired by real research
- SoundFont instruments, piano-roll view with DNA mapping
- Export to MIDI / WAV / JSON and play in any music software
- AI agent that composes melodies through conversation
LabFlow LIMS — Offline Lab Information Management
A free, offline lab information management system that runs in your browser. Register samples with auto-generated codes, track reagent stock and expiry, manage experiment tasks, and log equipment maintenance — with a live dashboard and one-click JSON backup. No install, no sign-up, data stays on your device.
- Sample management with auto-generated codes and status workflows
- Reagent inventory with stock in/out history, low-stock & expiry alerts
- Experiment tasks linked to samples and reagents, with priorities and due dates
- Dashboard, equipment records, and full offline PWA with JSON backup
Offline-first lab management — samples, reagents, tasks & equipment
Frequently asked questions
- Is ChemBioTube free to use?
- Yes. Every tool and app is free, with no account, no subscription and no usage limits.
- Do you store my sequences or data?
- No. Every calculation runs in your browser — DNA sequences, protein structures and imported files never leave your device.
- Do I need to install anything?
- No. Open a tool in any modern browser and start working. All five apps can also be installed as PWAs if you want offline access.
- Can I use it for research, teaching or commercial work?
- Yes. Use the calculators and cite the results however you like — there is no licence restriction on your data or your output.
- What do the built-in AI agents actually do?
- The five apps include an AI assistant that calls the site's own calculators as tools, so it runs a real sequence or chemistry calculation instead of guessing an answer.
Browse all tools
76 tools and counting — DNA analysis, chemistry calculators, and more.