Comparison

VOID vs PLC Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

VOID

Securely encrypt your messages offline with military-grade AES-256 encryption. Customize parameters, use hidden keys for extra protection, and even encode texts into emoji. Your data remains entirely on your device, ensuring complete privacy.

Highlights
  • Offline AES-256 encryption
  • Customizable encryption parameters
  • Hidden key (VOID Secret)
  • Emoji text encoding
  • No internet connection required
  • No accounts or registration
Features
Read full description

With VOID, you can: • Encrypt your texts securely and offline. VOID uses AES-256 encryption to protect your information with military-grade security. All encryption and decryption happen locally on your device - your data never leaves your phone. No cloud storage, no internet connection, no third-party servers. Your information stays completely offline. • Encrypt your files with AES-256 + Argon2id. VOID protects not just text, but your files too. File encryption combines AES-256 with Argon2id - a memory-hard key derivation function that won the Password Hashing Competition - making brute-force attacks practically impossible. Encrypt any file directly on your device with no internet connection required. • Customize encryption parameters. Take full control of how your data is secured. Fine-tune settings including salt length (0-256 bytes), number of iterations (up to 500), memory usage (up to 1024 MiB), parallelism (up to 6 threads), and key length (up to 224 bytes). Apply up to 7 layers of encryption for maximum security. Advanced users can optimize encryption strength according to their needs. • Use a hidden key (VOID Secret). VOID Secret is a hidden key variant generated per device. Each device can generate up to 999 different hidden keys, providing an extra layer of protection. Only you can decrypt messages with the correct VOID Secret - your communication stays fully confidential even if the main password is shared. The hidden key is optional but adds meaningful security for sensitive conversations. • Encode your texts in emoji. Transform your messages into emoji sequences. VOID converts your text to Base64 and then into emojis, so you can send encrypted messages that look like strings of symbols. Adds a layer of secrecy while making encryption visually engaging. • Generate and customize QR codes. Turn any encrypted text into a QR code. Customize appearance - colors, style, and format - then export in multiple formats and share however you choose. Additional Features: Offline-first design: VOID never connects to the internet, stores, or transmits your data. No accounts or registration: No personal information is ever required. Temporary decryption timer: Set a self-expiring timer so messages can only be decrypted within a limited time. Security Mode: Blocks screenshots and screen recordings completely. Multilingual support: Use VOID in your preferred language. Intuitive UI/UX: Designed with Apple's guidelines in mind, with animations, haptic feedback, and simple navigation. With VOID, your information is encrypted and under your full control. You decide how, when, and with whom to share it. Secrets truly stay secret. Links Privacy Policy: https://ge-developer.github.io/VOID/privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

PLC Pro

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PLC Pro is the essential professional calculator designed specifically for instrumentation engineers, technicians, and control systems specialists. Streamline your fieldwork with precise tools for signal calibration, alarm configuration, and PLC/DCS integrations—all in one powerful, pocket-sized app. Key Features: • Multi-Signal Support – Effortlessly handle 4-20mA, 0-20mA, or 0-10V signals • 5-Point Signal Check – Generate instant calibration checkpoints at 0%, 25%, 50%, 75%, and 100% • Raw Count Conversion – Seamlessly convert between ADC/DAC counts and engineering units for any PLC or DCS system • Alarm Setpoint Calculator – Compute low/high pre-trip and trip values with deadband resets • Deviation Alarms – Apply deviation percentages and view values across all checkpoints • Square Root Extraction – Built-in calculations for flow transmitters • Save & Organize – Store unlimited calculations for fast field reference • Fault Detection Reference – Integrated NAMUR NE43 guidelines for reliable signal diagnostics Ideal For: Instrument technicians • Control systems engineers • PLC/DCS programmers • Process engineers • Maintenance professionals • Automation specialists Elevate your instrumentation workflow with PLC Pro—accuracy and efficiency at your fingertips.

Screenshots

VOID4 screens
PLC Pro4 screens

Verdict

The call

The clearest difference is price: VOID at Free against PLC Pro's $9.99. PLC Pro's advantage is in-app purchases (none vs 3) and update cadence (every 5 days vs every 6 months). On ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

VOID is free to download; PLC Pro costs $9.99 up front. VOID sells 3 in-app purchases, starting at $1.99 per month. PLC Pro asks for nothing beyond the download.

UpkeepUpdate frequency

VOID ships an update every 6 months, PLC Pro every 5 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

Scorecard4 real differences · 6 level
VOID versus PLC Pro: the parameters behind the verdict, then further details
ParameterVOIDPLC Pro
PriceFree — better$9.99
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 6 monthsEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhoneiPhone, iPod — better
Requires iOS18.015.1 — better
Further details — not scored
Size19 MB47 MB
Age rating4+4+
DeveloperMikhail BukhrashviliJames Johnson

In-app purchases

3 purchases

VOID

Subscriptions2
  • Monthly3 Days trial$1.991 Month
  • Annual$5.991 Year
One-time1
  • Lifetime$9.99
None

PLC Pro

No in-app purchases

Questions

Is VOID free?
VOID is free to download, with in-app purchases available.
Is PLC Pro free?
PLC Pro costs $9.99, with no in-app purchases.
Do VOID or PLC Pro have ads?
Neither VOID nor PLC Pro shows ads.
Which is updated more often, VOID or PLC Pro?
VOID ships an update every 6 months, and PLC Pro every 5 days. Most recently, VOID was updated on October 25, 2026 and PLC Pro on October 28, 2026.

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