OpenEPI · Tools

Seven tools, open.

Free browser instruments for radiopharmaceutical work. Every number on them carries its source; none of them needs an account.

All 7 open now · free, no sign-in needed

About OpenEPI

01Calculator
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Kd to pKd and ΔG
Convert a dissociation constant to pKd and binding free energy at any temperature, with the formulas and worked examples.
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02Calculator
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Decay and activity planner
Activity at injection from a calibration, or the reverse, for 27 clinical radionuclides or any half-life, with the decay curve and unit conversions.
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03Calculator
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Molar and specific activity
GBq/µmol, Ci/µmol and GBq/mg from an activity and an amount, against the carrier-free maximum for the nuclide.
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04Calculator
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SUV calculator
Standardized uptake value from a tissue concentration, the injected activity decay-corrected to scan time, and body weight, lean mass or surface area.
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05Analyzer
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Peptide analyzer
Mass, pI, charge against pH, hydropathy, aromaticity, extinction coefficient and composition from a one-letter sequence.
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063D viewer
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Structure viewer
Any PDB entry or your own file, rendered in the browser: cartoon, surface, sticks, chain and B-factor colors, distances, PNG export.
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07Reference table
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Isotope half-lives
27 therapeutic and diagnostic radionuclides: half-life, decay mode, principal emissions and clinical use, each cited.
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Reference tools, not Epitorix performance. Every model figure on this page is quoted from Science with its own fence and links back to the beat that owns it; nothing here adds a claim of its own — numbers, methods and program status live on Science and Pipeline.

Kd to pKd and ΔG

Decay and activity planner

Molar and specific activity

SUV calculator

Peptide analyzer

Structure viewer

Isotope half-lives