Comparison

Chapters vs SimpleSigma+

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

Head to head
About

Chapters

This app allows users to create and edit ePub ebook files. It supports viewing, formatting text, and saving changes. Features like iCloud sync, autosave, and unlimited undo enhance the editing experience.

Highlights
  • Create and edit ePub files
  • View documents in vertical scroll
  • Edit and format text
  • Save changes to files
  • iCloud Drive sync
  • Autosaving
  • Unlimited undo/redo
Read full description

Chapters can create new ePub documents and open existing ePub files for editing. ePub is the most widely adopted file format for ebooks. ePub files reflow their content for comfortable reading on screen of any size from smartphones to desktops. Each document's content zipped into a single file for maximum portability. It is an open and vendor-independent file format based on popular web standards, such as HTML and CSS. With Chapters, you can ▪ Open existing files and create new ePub documents ▪ View an entire document in vertical scroll view ▪ Pinch to zoom and smart zoom with double-tap ▪ Edit and format document’s text ▪ Save your changes back to the file ▪ Use Table of Contents to jump ahead (on Mac only at the moment) ▪ Print and export to PDF (on Mac only at the moment) ▪ Add cover image and modify metadata (on Mac only at the moment) Chapters also supports ▪ iCloud Drive for keeping documents in sync on all your devices ▪ Autosaving automatically saves changes in background while you are editing ▪ Unlimited undo and redo as you edit ▪ Browsing previous changes and restoring them ▪ Resume your work right where you left off once app launches ▪ Side by side multitasking with another app in full screen split view on Mac and iPad ▪ Sharing documents with others via Messages, Mail and AirDrop If you encounter a bug or app crashing, please contact app’s support at chapters@shaw.ca Thank you!

About

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.

Highlights
  • 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
Features
Read full description

"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.

Screenshots

Chapters2 screens
SimpleSigma+4 screens

Verdict

The call

The clearest difference is review sentiment: SimpleSigma+ at 100% against Chapters's 33%. SimpleSigma+ also leads on update cadence (every 3 weeks vs every 7 months) and price ($3.99 vs $9.99). Chapters's advantage is device support (4 vs 1) and iOS requirement (15.0 vs 17.1). On ads, in-app purchases and monetization model 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

Chapters costs $9.99 and SimpleSigma+ $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Chapters ships an update every 7 months, SimpleSigma+ every 3 weeks. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

Scorecard5 real differences · 5 level
Chapters versus SimpleSigma+: the parameters behind the verdict, then further details
ParameterChaptersSimpleSigma+
Price$9.99$3.99 — better
Rating1.0 (1 ratings) — better—
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings1 — better—
Update frequencyEvery 7 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone
Requires iOS15.0 — better17.1
Further details — not scored
Size1 MB1 MB
Age rating4+4+
DeveloperTwo-Byte Software Inc.MUTSUAKI KIKUCHI

Customer experience

Chapters

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews9 reviews
Positive33.3%
Neutral11.1%
Negative55.6%

SimpleSigma+

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Chapters

No in-app purchases

None

SimpleSigma+

No in-app purchases

Questions

Is Chapters free?
Chapters costs $9.99, with no in-app purchases.
Is SimpleSigma+ free?
SimpleSigma+ costs $3.99, with no in-app purchases.
Do Chapters or SimpleSigma+ have ads?
Neither Chapters nor SimpleSigma+ shows ads.
Which is updated more often, Chapters or SimpleSigma+?
Chapters ships an update every 7 months, and SimpleSigma+ every 3 weeks. Most recently, Chapters was updated on October 2, 2026 and SimpleSigma+ on October 7, 2026.

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