SimpleSigma+ vs SD Toolkit
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SimpleSigma+
This app simplifies numerical tabulation with three distinct spreadsheet types for various calculation needs. It offers quick data input, immediate recalculation, and convenient features like CSV import/export and tax settings.
- Three spreadsheet types (Simple, Duplex, Shopping)
- Quick data input and immediate recalculation
- Swipeable keyboard for cell navigation
- Customizable consumption tax settings
- Save and reuse calculation data
- CSV data import and export
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"SimpleSigma+” easily totals numerical values in a table. You don't need to input extra data, so you can quickly input values only and get the calculation result. Its function and characteristics are ————————- 3 types of spreadsheet [Simple] -- Sum of simple numbers [Duplex] -- Enter and calculate the quantity for each value too [Shopping] -- Enter quantity and consumption tax for each value too and calculate Swipe the keyboard to quickly move the active cell. Each time you tap the key, it will be recalculated so you can see the result immediately. Initial setting of consumption tax is possible. Saving and reusing each calculation data. Data import and export in CSV format. ————————- Enjoy the maximum comfort with a simple and easy-to-understand interface. "SimpleSigma +" does not display advertisements. It can be used in full screen. There is also a free version "SimpleSigma" that displays advertisements.
SD Toolkit
Troubleshoot aviation satcom terminals via serial connection. This tool helps diagnose and resolve issues with satellite communication equipment used in aircraft.
- Troubleshoot satcom terminals
- Serial connection support
- Aviation specific
- Diagnose communication issues
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SD Toolkit allows for troubleshooting of aviation based satcom terminals over serial connection.
Screenshots
Verdict
The clearest difference is price: SD Toolkit at Free against SimpleSigma+'s $3.99. SD Toolkit also leads on device support (3 vs 1) and iOS requirement (14.0 vs 17.1). SimpleSigma+'s advantage is update cadence (every 3 weeks vs every 27 months). On 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
SD Toolkit is free to download; SimpleSigma+ costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SimpleSigma+ ships an update every 3 weeks, SD Toolkit every 27 months. Both last shipped on November 3, 2026.
| Parameter | SimpleSigma+ | SD Toolkit |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | — | 2 — better |
| Update frequency | Every 3 weeks — better | Every 27 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.1 | 14.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | MUTSUAKI KIKUCHI | Satcom Direct |
Customer experience
SimpleSigma+
SD Toolkit
In-app purchases
SimpleSigma+
No in-app purchases
SD Toolkit
No in-app purchases
Questions
Is SimpleSigma+ free?
Is SD Toolkit free?
Do SimpleSigma+ or SD Toolkit have ads?
Which is updated more often, SimpleSigma+ or SD Toolkit?
Other comparisons
