MolecuLens vs Chembook

Explore molecules in 3D, learn chemistry faster, and generate shareable figures with help from AI. MolecuLens gives you access to 100M+ compounds from PubChem. Search by name, SMILES, formula, or even draw — then explore interactive 2D/3D structures in seconds. VISUALIZE & EXPLORE • Interactive 2D and 3D molecular viewing • Highlight functional groups, rings, and key regions with Lens mode • Native support for transition metal complexes (11 metals, 5+ geometries) • Conformer generation for molecules without existing 3D structures AI-POWERED LEARNING • Generate guided molecular tours with AI narration • Create quizzes grounded in molecular analytics • Turn structures into stories for teaching and communication SEARCH ANY WAY YOU WANT • Common names: "caffeine", "aspirin", "glucose" • SMILES strings: paste any valid structure • Coordination notation: "[Fe(H2O)6]3+" • Chemical formulas and PubChem CIDs BUILT FOR EDUCATION Great for organic chemistry students, biochem learners, educators, and science communicators. Build intuition by interacting with structures — not memorizing them. MolecuLens PRO (Auto-Renewable Subscription) Pro unlocks premium features including: • 3D orbital overlays (HOMO, LUMO, electron density) • Unlimited AI-guided molecular tours • Custom interactive quiz generation • High-quality molecular diagram generation Free trial and pricing • 7-day free trial (where available) • Monthly: $4.99/month • Annual: $24.99/year Payment is charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription in Settings → Apple ID → Subscriptions. Privacy Policy: https://www.moleculens.com/privacy-policy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Chembook is an offline chemistry reference built around things you can turn, step through, and take apart. REACTION MECHANISMS IN 3D Step through 128 reaction mechanisms frame by frame, with curved electron-pushing arrows drawn on the actual atoms. Explore quantum-optimized structures alongside teaching models of the steps between them. Switch between the 3D model and a clean 2D skeletal depiction. ADVANCED TOPICS Explore six interactive lessons: collision theory, potential energy surfaces, Woodward–Hoffmann rules, crystal field and Jahn–Teller effects, Walsh diagrams, and band theory. Follow reaction trajectories across energy landscapes. Change molecular geometry to see orbital energies shift, explore spin and distortion, and watch discrete energy levels become bands. ATOMIC & MOLECULAR ORBITALS Rotate orbital isosurfaces in 3D, from s, p, d and f atomic orbitals to computed molecular orbitals. Explore their shapes, nodes and wavefunction signs. SPECTROSCOPY REFERENCE 1H and 13C NMR shift tables, IR and Raman bands, mass spectrometry and UV-Vis, with tappable reference entries that place peaks on a live spectrum. Includes an interactive n+1 splitting-tree tool. MOLECULAR DYNAMICS LAB Run interactive molecular simulations on your device. Explore argon, water and ionic systems, adjust temperature and density, and watch molecular motion and the radial distribution function update as the simulation runs. STRUCTURES & CONFORMERS Chair flips, anomers, amino acids, unit cells and framework solids in 3D, with a Ramachandran plot and potential-energy scans you can drag. PERIODIC TABLE All 118 elements with trends, a comparison view and detailed properties. QUIZ Seven modes: periodic table, compound hunt, reaction mechanisms, spectra identification, vibrational mode matching, nomenclature, and amino acids. BUILT FOR OFFLINE STUDY All reference content, lessons and visualizations work offline. No Chembook account, no sign-in, no analytics, no ads and no personal data collection. Your notes and study progress stay on your device. An internet connection is needed for purchases and restores. FREE AND PRO 20 core reaction mechanisms, the full periodic table, all spectroscopy reference, orbitals, structures, and the molecular dynamics lab are free. A single one-time purchase unlocks the remaining 108 mechanisms, all six Advanced Topics lessons and unlimited quiz play.