Comparison

PRODEOS vs Sigma Notepad Calculator

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

Head to head
About

PRODEOS

Features
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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.

About

Sigma Notepad Calculator

Features
Read full description

$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 what’s 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 what’s paid and the total shows what’s 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 you’d 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 doesn’t. 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

PRODEOS4 screens
Sigma Notepad Calculator4 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences Β· 2 level
PRODEOS versus Sigma Notepad Calculator: the parameters behind the verdict, then further details
ParameterPRODEOSSigma Notepad Calculator
PriceFreeFree
Update frequencyEvery 3 weeksEvery 2 weeks β€” better
AdsYesNo β€” better
In-app purchasesNo β€” betterYes
DevicesiPhone, iPad, iPod β€” betteriPhone
Requires iOS12.2 β€” better17.0
Further details β€” not scored
Size102 MB18 MB
Age rating4+4+
DeveloperProdeosSoules Studio Ltd

In-app purchases

None

PRODEOS

No in-app purchases

3 purchases

Sigma Notepad Calculator

Subscriptions2
  • Monthly$1.991 Month
  • Annual7 Days trial$14.991 Year
One-time1
  • Lifetime$29.99

Questions

Is PRODEOS free?
PRODEOS is free to download, with no in-app purchases.
Is Sigma Notepad Calculator free?
Sigma Notepad Calculator is free to download, with in-app purchases available.
Do PRODEOS or Sigma Notepad Calculator have ads?
PRODEOS shows ads; Sigma Notepad Calculator does not.
Which is updated more often, PRODEOS or Sigma Notepad Calculator?
PRODEOS ships an update every 3 weeks, and Sigma Notepad Calculator every 2 weeks. Most recently, PRODEOS was updated on October 27, 2026 and Sigma Notepad Calculator on October 31, 2026.

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