An independent app studio in Kerala, India

We build the apps we wish we’d had as students — and still reach for as clinicians.

Docodex Labs designs focused, offline-first mobile tools for medical students, postgraduate aspirants, and the clinicians they become — a pediatric dosing calculator, a DNB question bank, a monoclonal antibody trainer, and one small utility app for everything else.

4
Apps shipped
2
Platforms — Android & iOS
470+
Medicines covered in PediaRex
28
Specialties covered in PrepDNB

How the studio works

Built at the bedside, checked before the exam.

Docodex Labs is built and maintained by Sajil Haq, a physician and medical educator based in Kerala — every product below is something the studio uses itself.

Written by someone who needed it first

Dosing tables, question banks, and mnemonics get checked against what’s actually asked on the wards and in the exam hall — not just what reads well in a feature list.

Offline first, private by default

Every app works without an internet connection, and each one — PediaRex, PrepDNB, MAb Ninja, and Dyzee — declares no data collected and no data shared with third parties in its Play Store safety disclosure.

Maintained, not abandoned

PediaRex has been through a full ground-up 2.0 rebuild. PrepDNB adds new exam sessions as they’re released. Reviews get real replies, not templates — because these are the apps we use too.

The portfolio

Four apps. Two platforms. One obsession with getting the details right.

P PediaRex app icon
PediaRex pediatric dose calculator screenshot
Flagship · Medical

PediaRex

The pediatric dosing calculator built for wards, OPD, and 3 a.m. certainty.

PediaRex converts a child’s weight into an exact syrup, injectable, or nebulizer dose in seconds. It covers 470+ medicines across fever, antibiotics, GI, respiratory, neurology, and ICU categories, with dedicated OP (outpatient syrups) and IP (hospital injectables) modes, plus clinical notes on dosing, contraindications, and Indian brand names.

  • 470+ medicines
  • mg/kg → mL instantly
  • OP + IP modes
  • Offline, no login
  • Clinical notes built in

⚠ Educational reference only — always verify against current protocol.

D PrepDNB app icon
PrepDNB previous year question bank screenshot
Exam prep · Postgraduate

PrepDNB

Ten years of DNB and DipNB exit-exam papers, organized the way you’d actually revise them.

PrepDNB collects a decade of real previous-year question papers across 28 broad specialties — from Anatomy to Radiodiagnosis — sorted by session and paper so residents can revise exactly what’s likely to reappear. An Important Topics section and an MCQ practice mode sit alongside the free question bank.

  • 28 specialties
  • 10+ years of papers
  • Paper 1–4 by session
  • MCQ practice mode
  • Offline after first load

Previous year papers: free · Important Topics & MCQ mode: one-time unlock.

M MAb Ninja app icon
MAb Ninja monoclonal antibody trainer screenshot
Pharmacology · NEET PG / INI-CET

MAb Ninja

Monoclonal antibodies, minus the confusion — built for exam-day recall.

MAb Ninja turns dense monoclonal antibody pharmacology into structured drug cards, mnemonics, and a naming-pattern system (–omab, –ximab, –zumab, –umab) that explains why each suffix means what it means. Oncology, immunology, and checkpoint-inhibitor antibodies are organized for quiz practice and last-minute recall.

  • Mnemonic-based recall
  • Suffix pattern logic
  • Quiz + flashcard modes
  • Dark & light mode
  • 100% offline, no ads
D Dyzee app icon
Dyzee dice and coin toss app screenshot
Utility · Everyday tool

Dyzee

A dice roller and coin toss that actually feels fair — for game nights and quick decisions.

Dyzee replaces the physical dice bag with a fast, realistic roller and an instant coin toss, backed by a proper random-number engine. Built for board games, classrooms, and the everyday “heads or tails” — lightweight, offline, and free of the clutter most randomizer apps carry.

  • Realistic dice physics
  • Instant coin toss
  • Fair RNG engine
  • Haptic + sound feedback
  • Works fully offline

Free to download · contains ads · an ad-free version is planned.

Built with Flutter, Python & PowerShell · shipped through Play Console and App Store Connect

github.com/docodexlabs

Get in touch

Bug report, feature idea, or a partnership — we read everything.

Based in Kerala, India.