# DRIN

> DRIN (iPhone/iPad app by Ihor Bochko.)

- Source: https://appshunter.io/ios/app/drin/id6717573414 (this page in markdown: same URL + `.md`)
- Developer: [Ihor Bochko](https://appshunter.io/developer/1770384389)
- Category: Utilities, Entertainment
- Price: Free
- Age rating: 4+
- Requires: iOS 15.6 · 42 MB
- Languages: American English
- Released: 2025-02-09
- Data updated: 2026-07-23
- User reviews in markdown: https://appshunter.io/ios/app/drin/id6717573414/reviews.md

## What is DRIN?

DRIN is the all-in-one offline toolkit for FPV racing pilots, long-range builders and hobbyists. Whether you're planning your first 5" quad or maintaining a fleet of 10" long-range platforms - DRIN has the tools you need, no internet required.

17 OFFLINE CALCULATORS
•    Flight time & thrust-to-weight ratio
•    Battery capacity, charge time & health (mAh → Wh)
•    ESC & propeller thrust
•    Ohm's law & link budget
•    Signal distance, VSWR loss & dBm to Watts conversion
•    Dipole design, antenna angle & radio horizon
•    VTX frequency table & Rx/Tx intermodulation checker
All calculators work fully offline — in the field, at the bench, anywhere.

PREFLIGHT CHECKLISTS
•    Separate checklists for FPV, fixed-wing and preflight inspection
•    Fully offline — never miss a step, even without signal

COMPONENT FINDER WITH LIVE PRICES
•    Browse and compare drone parts sourced from AliExpress — only components with verified quality
•    Auto-generated build recommendations for 5", 7", 8", 9" and 10" drones
•    Build your own setup from recommended parts, or bookmark components to a local database
•    Price updates delivered directly in the news feed

FLIGHT LOG & BLACKBOX IMPORT
•    Log every flight manually or import directly from Betaflight Blackbox
•    Track: voltage start/end/min, flight duration, temperature, altitude, distance, battery health
•    Assign logs to specific drones and batteries
•    Visualize your data with charts: voltage drop, flight duration, distance & altitude, flight type breakdown

BETAFLIGHT CAMERA & VTX PRESETS
•    Ready-to-use Betaflight configurations for popular cameras and VTX modules
•    Save your preferred presets for offline access

KNOWLEDGE BASE & NEWS
•    Short guides and life hacks written by pilots who fly daily
•    Component overviews, setup tips and best practices
•    News feed with firmware releases and price updates
•    Save any article offline for field reference

Available in English, Ukrainian, Spanish and Portuguese.


## Version history (last 5 releases)

### 1.3.0 — 2026-07-21

This release adds two major tools:

Rate Build — Enter your motor, prop, battery, and frame specs and get an instant score with a clear verdict on thrust-to-weight, hover throttle, and part mismatches. Works fully offline. Rate a build straight from a saved Setup, get a "stale" notice when you edit it, and share your score via a link.

Blackbox Advisor (Beta) — Analyze blackbox flight logs for PID tuning issues, prop wash, motor noise, and filter latency, with presets per flight style. New step-response, spectrum, and throttle-vs-frequency charts, plus faster parallel analysis with live progress.

Also new: a Morse code trainer and coder

### 1.2.1 — 2026-04-01

What's new in version 1.2.1:

— Flight Log: add entries manually or import directly from Betaflight Blackbox
— Flight charts: voltage drop, flight duration, distance/altitude, flight type breakdown
— Radio horizon calculator: added return signal calculation from the drone
— Bug fixes and stability improvements

### 1.2.0 — 2026-03-30

New: Flight Log with Blackbox import. Track voltage, altitude, distance & battery health across every flight.

### 1.1.4 — 2025-10-09

- Improved app stability.  
- Added the ability to create custom configurations.

### 1.1.3 — 2025-07-18

- Added a frequency table for quickly checking potential interference from nearby drones
- Added an Rx/Tx compatibility calculator to detect possible issues caused by intermodulation

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-23.*