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.
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
All Tools
95 tools and counting — DNA analysis, chemistry calculators, and more.
DNA & Nucleic Acid Tools
16 toolsReverse complement, GC content, primer Tm, PCR setup, gel planning and sequence analysis.
View allPrimer Design & QC Tools
7 toolsDesign primer pairs from a template, check hairpins and dimers, calculate oligo MW and OD yield, and set PCR conditions.
View allMolecular Cloning
7 toolsDesign seamless assemblies before you order primers: Gibson, Golden Gate, In-Fusion, Gateway, SLiCE, TA/TOPO and site-directed mutagenesis.
View allProtein Tools
8 toolsTranslation, molecular weight, isoelectric point, amino acid composition and enzyme kinetics.
View allCell Culture
5 toolsCounting, plating, growth, media preparation and clonogenic assay calculators for routine culture work.
View allAssays & Quantification
7 toolsCalibration curves, activity units and quantification calculators for assay readouts.
View allPlasmids
1 toolsInteractive plasmid designer with restriction sites, ORFs and sequence features.
View allSolution Preparation
7 toolsMake stock and working solutions: molarity, dilution, percent solutions and concentration conversions.
View allReactions & Stoichiometry
10 toolsBalance equations, predict products, and scale reactants to product amounts.
View allAcids, Bases & Buffers
5 toolspH, pKa and Henderson–Hasselbalch buffer calculations for biological systems.
View allStructure & Composition
7 toolsParse formulas, compute molar mass and elemental composition, browse the periodic table.
View allLab Conversions
4 toolsEveryday bench conversions: metric units, centrifuge RPM to g-force and back.
View allMaterials Science
11 toolsCrystal density, XRD angles, thermal analysis, particle size and battery electrode calculations.
View allGeneFlow — 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
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
A virtual chemistry lab that runs in your browser
A free browser-based virtual chemistry lab with 58 guided beaker experiments across junior high, senior high and college inorganic chemistry. Add reagents and watch bubbles, precipitates, color changes and heat appear in real time — with the balanced equation and compound data right beside the beaker. No install, no sign-up.
- 58 guided experiments across junior high, senior high and college inorganic chemistry
- Real-time beaker simulation: bubbles, precipitates, color changes and heat
- Built-in compound database — formulas, molar masses and structures from PubChem
- Free mixing mode to combine any reagents and see what reacts
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 Management for Personal Labs
A free, offline lab information management system built for personal labs and small research groups. It runs in your browser: register samples with auto-generated codes, track reagent stock and expiry, manage experiment tasks and equipment maintenance, record results against your own test methods, run QC checks, and issue reports. No install, no sign-up — your data stays on your own computer.
- 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
- Test methods, QC checks and COA reports, fully offline PWA
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
95 tools and counting — DNA analysis, chemistry calculators, and more.