Comparison

basalt vs Sigma Notepad Calculator

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

Head to head
About

basalt

Features
Read full description

Write notes with AI suggestions as you type. basalt is a private notebook for drafts, ideas and journal entries, powered by Apple Intelligence on your device. GET HELP WHILE YOU WRITE Suggestions and questions appear alongside your note. Change the assistant’s prompt to ask for the kind of response you want. FIND YOUR NOTES Search your writing and browse short automatic summaries in the note list. Your recently edited notes appear first. KEEP YOUR WRITING LOCAL Notes are stored on your device. No account is required, and your writing is not sent to a developer-run AI service. AI features require a compatible device with Apple Intelligence enabled and its on-device model available. Availability depends on your device, language and region. AI suggestions may be inaccurate. Create two notes for free. basalt Pro unlocks unlimited notes with a weekly or yearly subscription. Prices and any eligible introductory offers are shown before purchase. Payment is charged to your Apple Account. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Manage or cancel your subscription in App Store account settings. Introductory offers are available only to eligible subscribers. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://hekec.notion.site/terms-privacy-policy-290a809cee65801882d9d13fc40c24b7

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. Your totals, without opening a note. Ask Siri for your Groceries total in Sigma, keep a note’s total on your Home Screen with the free widget, and set a reminder on a date in your note. 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

basalt4 screens
Sigma Notepad Calculator4 screens

Verdict

The call

The clearest difference is iOS requirement: Sigma Notepad Calculator at 17.0 against basalt's 26.0. On price, update cadence, ads and in-app purchases 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

Both are free to download. basalt sells 2 in-app purchases, starting at $0.99 per 7 days and Sigma Notepad Calculator sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

basalt ships an update every 10 days, Sigma Notepad Calculator fortnightly. The most recent releases landed on October 28, 2026 and November 9, 2026 respectively.

Scorecard1 real difference · 5 level
basalt versus Sigma Notepad Calculator: the parameters behind the verdict, then further details
ParameterbasaltSigma Notepad Calculator
PriceFreeFree
Update frequencyEvery 10 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone
Requires iOS26.017.0 — better
Further details — not scored
Size11 MB19 MB
Age rating4+4+
DeveloperIgor DiachukSoules Studio Ltd

In-app purchases

2 purchases

basalt

Subscriptions2
  • Basalt Weekly3 Days trial$0.997 Days
  • Basalt Yearly7 Days trial$12.991 Year
3 purchases

Sigma Notepad Calculator

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

Questions

Is basalt free?
basalt is free to download, with in-app purchases available.
Is Sigma Notepad Calculator free?
Sigma Notepad Calculator is free to download, with in-app purchases available.
Do basalt or Sigma Notepad Calculator have ads?
Neither basalt nor Sigma Notepad Calculator shows ads.
Which is updated more often, basalt or Sigma Notepad Calculator?
basalt ships an update every 10 days, and Sigma Notepad Calculator fortnightly. Most recently, basalt was updated on October 28, 2026 and Sigma Notepad Calculator on November 9, 2026.

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