PRODEOS vs Sigma Notepad Calculator
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
PRODEOS
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PRODEOS is a comprehensive QHSE management app designed to simplify and enhance your safety and quality processes. Key features include: - Smart Reporting: Quickly generate detailed reports that provide clear, actionable insights to support decision-making and compliance. - Seamless Action Tracking: Stay on top of tasks and corrective actions with efficient tracking tools that ensure no detail is overlooked. - Instant KPI Insights: Access key performance indicators in real-time to monitor safety metrics and drive continuous improvement. - ISO/MASE Certification Support: Integrated support for major safety and quality certifications, helping your organization meet regulatory standards and maintain compliance effortlessly. - User-Friendly Interface: An intuitive design that makes managing QHSE tasks simple for all team members, from field operators to senior management. PRODEOS empowers your team with the tools they need to excel in safety management, reduce incidents, and promote a proactive safety culture. Take control of your QHSE processes with this all-in-one solution.
Sigma Notepad Calculator
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$610 left this month, before rent went out, and you never typed a sum. Sigma is a notepad that does the math while you write: every line shows its answer, and the total stays in view above the keyboard. Know whatβs left before you spend it. Write "pay = $2400", then your bills, "rent: $1200" and "food: $380", and "left = pay - total" shows $820. Rent goes up? Change one number and everything below follows. Split the bill at the table. Dinner for four, tip included, comes to $51.75 each before anyone reaches for a card. Then send the whole note to the group chat as one image, every line and the total included. Know what the trip costs before you book. Flights in dollars, the hotel in euros, the train in Swiss francs: one total, all in, in your own currency. Rates stay live and keep working offline. Never add up the same list twice. Tick whatβs paid and the total shows whatβs still to pay. Give each part of a list a heading and each part gets its own total. And all the everyday math around it. How many days until an invoice is due. Whether a 220 cm sofa fits an 8 ft wall. What you really saved at the sale. What a week of freelance work comes to. Percentages, units, dates and currencies, written the way youβd say them, with square roots, hex and trigonometry when you need them. Every line answers as you type. No formulas, no grid, and one rule to learn: a colon counts, an equals sign doesnβt. Free: three notes and the full calculator. No ads, no time limit. Sigma Pro keeps every month: unlimited notes, iCloud sync, export to PDF, Markdown and plain text, and five more themes. Sigma Pro is a single payment or monthly. Your notes stay on your iPhone, and iCloud sync uses your own private iCloud database, never our servers. Works in English and French. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://getsigma.app/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: PRODEOS at none against Sigma Notepad Calculator's 3. PRODEOS also leads on device support (3 vs 1) and iOS requirement (12.2 vs 17.0). Sigma Notepad Calculator's advantage is ads (none vs shown). On price and update cadence there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Sigma Notepad Calculator sells 3 in-app purchases, starting at $1.99 per month. PRODEOS asks for nothing beyond the download.
PRODEOS ships an update every 3 weeks, Sigma Notepad Calculator every 2 weeks. The most recent releases landed on October 27, 2026 and October 31, 2026 respectively.
| Parameter | PRODEOS | Sigma Notepad Calculator |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 2 weeks β better |
| Ads | Yes | No β better |
| In-app purchases | No β better | Yes |
| Devices | iPhone, iPad, iPod β better | iPhone |
| Requires iOS | 12.2 β better | 17.0 |
| Further details β not scored | ||
| Size | 102 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Prodeos | Soules Studio Ltd |
In-app purchases
PRODEOS
No in-app purchases
Sigma Notepad Calculator
- Monthly$1.991 Month
- Annual7 Days trial$14.991 Year
- Lifetime$29.99
Questions
Is PRODEOS free?
Is Sigma Notepad Calculator free?
Do PRODEOS or Sigma Notepad Calculator have ads?
Which is updated more often, PRODEOS or Sigma Notepad Calculator?
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