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4n6 Tools
Forensic medicine · calculators · on-device

4n6 Tools · forensic calculators that compute, interpret and cite

27 tools for the autopsy table, the scene and the expert report: time of death, toxicology, identification, DVI and anthropology. Every result carries a range or a caveat and every method its citation: a result you cannot defend is worse than none.

Pro on the App Store Pro on Google Play Free Lite ›
Henssge · Marshall–Hoare · 95 % CI Ethanol · Widmark 67 substances DVI · INTERPOL 2023 Cited methods 12 languages from 5.5 · offline iPhone · iPad · Android

What the app contains

Time of death and thanatology

The Henssge nomogram with a corrective-factor assistant and 95 % intervals, post-mortem changes on a shared timeline (livor, rigor by muscle group, corneal clouding, Casper's rule), vitreous potassium by four methods with hypoxanthine as a check, and forensic entomology with the ADD method.

Toxicology

Ethanol: interpretation, Widmark, back-calculation to the time of the event, a blood-alcohol curve with an uncertainty band and breath conversion. Reference levels for 67 substances in therapeutic – toxic – lethal ranges and post-mortem femoral blood values from 122,000 autopsies. CO-Hb and vitality in fire.

Trauma and cardiac pathology

Burns (TBSA per Lund and Browder, the Baux score and its revision), body surface area and predicted heart weight, age from aortic circumferences, the Traub index, BMI and nutritional status.

Identification and anthropology

DVI per the INTERPOL DVI Guide 2023, odontology (dental chart, AM/PM comparison, six age-estimation methods), blood groups and stains, stature from long bones, sex and age of the skeleton, foetal age from the femur.

Microscopy and imaging

Cell and structure counting with semi-automatic detection, CPA quantification in desmin IHC, a grey-card-calibrated colorimeter and photogrammetry: lengths, angles and areas from a photograph, with native measurement on LiDAR iPhones.

Case and report

Enter the case data once; the tools hand their results to a shared report with sources, which you export and back up together with the case.

Built for expert practice

Lite for free, Pro as a one-time purchase

Lite includes seven fully working tools so you can check whether the app fits your practice. Pro unlocks all 27 tools: a one-time purchase with no subscription, no ads and no data collection.

Lite · freePro · €104.99
Henssge, vitreous potassium, Traub index, BMI, body surface and heart, age from the aorta, unit converter✓✓
Post-mortem changes, toxicology and ethanol, 67 substances, CO-Hb-✓
Entomology, burns, DVI, odontology, anthropology-✓
Microscopy, colorimeter, photogrammetry, case and report-✓
Preview of the other tools (form, method, references), since version 5.1✓–
PlatformiOS 17+ · AndroidiOS 17+ · Android
Lite on the App Store Lite on Google Play Manual (PDF, English) ›

Privacy first

4n6 Tools is a professional aid for qualified experts: it is not a medical device and does not replace the judgement of the examining physician or expert. The author is Ján Šikuta, MD, PhD, a forensic pathologist. Privacy · Support

Frequently asked questions

How does 4n6 Tools Lite differ from Pro?

Lite is free and includes seven fully working tools: the Henssge nomogram, PMI from vitreous potassium, the Traub index, BMI, body surface area and predicted heart weight, age from aortic circumferences and a unit converter. Pro unlocks all 27 tools, including toxicology, ethanol, entomology, DVI, odontology and anthropology. Since version 5.1, Lite also opens the other tools as a preview: the form, the method and the references; Pro calculates the result.

Is 4n6 Tools a medical device?

No. It is a professional aid for forensic pathologists and expert witnesses; values are orientational, every result carries a range or a caveat, and the final assessment belongs to a qualified expert.

Does the app work offline?

Yes. All calculations run on the device; the app needs no connection and transmits no data.

Why does Pro cost €104.99?

It is an extensive professional tool: 27 tools, 67 substances with reference levels and methods revised against the primary literature, cited with every result. It is a one-time purchase with no subscription, ads or data collection; after VAT and the store commission roughly 57 % of the price reaches the author.

Which languages does the app support?

Pro (since 5.5) and Lite (since 5.3), in twelve: Slovak, English, Czech, German, Italian, French, Ukrainian, Polish, Hungarian, Chinese (Simplified), Spanish and Portuguese (Brazil): the whole interface, results and report. On first launch it follows the phone language, and the language can be changed at any time with the header button.