# OT Toolbox — Automation & OT Calculators

> Automation & OT Calculators (iPhone/iPad app by Dominik Gausmann.)

- Source: https://appshunter.io/ios/app/ot-toolbox/id6815303257 (this page in markdown: same URL + `.md`)
- Developer: [Dominik Gausmann](https://appshunter.io/developer/1870320985)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 5 MB
- Languages: American English, Dutch, French (France), German (Germany), Italian, Polish, European Spanish
- Released: 2026-09-29
- Data updated: 2026-10-02

## What is OT Toolbox?

OT Toolbox is a compact collection of practical tools for automation, controls engineering, commissioning, maintenance, and industrial service. Instead of searching through formulas, tables, and separate apps, keep essential OT calculations organized in one place – directly on your iPhone and without an account.

NETWORKING AND INDUSTRIAL COMMUNICATION
• IPv4 subnet calculator with network, broadcast, host range, and wildcard
• IP comparison plus CIDR and subnet-mask conversion
• IP planning, device inventory, and port reference
• PROFINET device-name validation
• OPC UA endpoint builder
• Data-rate, transfer-time, and Ethernet frame-budget calculations

SIGNALS AND INSTRUMENTATION
• Linear scaling for analog values and PLC raw values
• 4–20 mA troubleshooting, loop budgeting, and measurement-error estimation
• PT100 resistance and temperature conversion
• PT100 lead-wire error estimation
• RC low-pass and ADC resolution calculations

PLC, DATA, AND MODBUS
• Binary, decimal, and hexadecimal conversion
• Bit masks and two's-complement representation
• Modbus address and FLOAT32 data conversion
• Register-block planning and RTU timing
• PLC time formats, watchdog sizing, memory demand, and cycle-load analysis

ELECTRICAL AND ENERGY
• Ohm's law plus active, apparent, and reactive power
• Voltage drop and cable losses
• 24 V DC power-supply sizing with reserve
• UPS runtime and capacitor backup estimation
• Energy consumption and operating-cost calculations

DRIVES AND PNEUMATICS
• Motor speed, motor torque, and gearbox calculations
• Encoder resolution, positioning accuracy, and conveyor speed
• Drive ramps and braking energy
• Air consumption, cylinder force, and valve-island reserve

SERVICE AND PRODUCTION
• Unit, time, and cycle-time conversion
• OEE and MTBF/MTTR availability
• Maintenance-interval forecasting
• Guidance calculation for safety distance
• Formula reference for recurring tasks

BUILT FOR DAILY FIELD WORK
Clear field labels, units, and contextual help show exactly what to enter. Favorites, history, and templates bring frequently used tools back quickly. Colleague Mode presents results clearly and makes technical calculations easier to share.

PRIVACY WITHOUT FRICTION
Technical inputs stay locally on your device. No account, no tracking, and no ads.

A selection of core tools is available for free. OT Toolbox Pro permanently unlocks advanced calculators and productivity features with one in-app purchase – no subscription.

Important: Results are calculation aids. Manufacturer documentation, applicable standards, safety requirements, and review by qualified professionals always take priority.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| OT Toolbox Pro | $3.99 | one-time |


## Is OT Toolbox safe?

Not enough ratings yet to assess OT Toolbox.

## Is OT Toolbox legit?

OT Toolbox appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for OT Toolbox is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-09-29

No release notes.

## Apps similar to OT Toolbox

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [My LoopCal](https://appshunter.io/ios/app/my-loopcal/id6792422682) | — | Free | Utilities |
| [I&C Tech Tools](https://appshunter.io/ios/app/i-and-c-tech-tools/id6756155332) | 1.0 (1) | Free | Utilities |
| [Sample and Adjust](https://appshunter.io/ios/app/sample-and-adjust/id6467094957) | — | Free | Utilities |
| [Electrical Troubleshooter](https://appshunter.io/ios/app/electrical-troubleshooter/id1345925300) | 3.5 (13) | Free | Utilities |
| [STS - Soft Starter Simulation](https://appshunter.io/ios/app/sts-soft-starter-simulation/id1409663811) | 5.0 (1) | Free | Utilities |
| [Unit Converter - Scientific](https://appshunter.io/ios/app/unit-converter-scientific/id6692634387) | 4.9 (18) | Free | Utilities |

## More apps by Dominik Gausmann

- [Würfly - Dice Score Sheet](https://appshunter.io/ios/app/wurfly-dice-score-sheet/id6758018932)
- [OT Subnet Calculator](https://appshunter.io/ios/app/ot-subnet-calculator/id6758581610)
- [Expiry - Expiration dates](https://appshunter.io/ios/app/expiry-expiration-dates/id6758586095)
- [MatchMoments](https://appshunter.io/ios/app/matchmoments/id6770105481)
- [Tap the Circle](https://appshunter.io/ios/app/tap-the-circle/id6770306077)
- [GolfTrackly](https://appshunter.io/ios/app/golftrackly/id6771446446)

All apps by Dominik Gausmann: https://appshunter.io/developer/1870320985

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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 2026-10-02.*