Comparison

D.S.Reader vs WonderCalc

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

Head to head

★ 4.73 ratingsView app →

About

D.S.Reader

Features

Read full description

E-Book Reader supporting EPUB, PDF, and CBZ formats, with custom fonts and custom dictionary support. When paired with calibre Content Server, you can easily browse your libraries, download books for reading. It will track and sync you reading progress and highlights across all devices paired with the same server.

About

WonderCalc

This utility app handles all your basic calculation needs, including unit conversions for length, weight, and temperature. It also offers advanced financial calculations for loans, such as monthly payments, total cost, and interest paid.

Highlights

Basic calculations
Cut, copy, and paste functionality
Unit conversions (length, weight, temperature)
Loan payment calculations
Total loan cost and interest calculation

Features

Read full description

WonderCalc performs all basic calculations, and allows you to cut, copy, and paste values to and from other apps. It can convert between units of length, weight, and temperature. It allows you to calculate monthly payments, as well as total cost and interest paid on the life of a loan.

Screenshots

D.S.Reader2 screens

WonderCalc3 screens

Verdict

The call

The clearest difference is ads: WonderCalc at none against D.S.Reader's shown. WonderCalc also leads on update cadence (every 5 days vs monthly). On price, in-app purchases, device support and iOS requirement 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

D.S.Reader ships an update monthly, WonderCalc every 5 days. The most recent releases landed on September 28, 2026 and September 30, 2026 respectively.

Scorecard2 real differences · 8 level

D.S.Reader versus WonderCalc: the parameters behind the verdict, then further details
Parameter	D.S.Reader	WonderCalc
Price	Free	Free
Rating	—	4.7 (3 ratings) — better
Positive reviews	—	100.0% of reviews
Number of ratings	—	3 — better
Update frequency	Monthly	Every 5 days — better
Ads	Yes	No — better
In-app purchases	No	No
Monetization	—	Free
Devices	iPhone, iPad, iPod — better	iPhone, iPad
Requires iOS	15.6 — better	16.0
Further details — not scored
Size	93 MB	5 MB
Age rating	17+	4+
Developer	Yi Li	SharkMonkey Apps

In-app purchases

None

D.S.Reader

No in-app purchases

None

WonderCalc

No in-app purchases

Questions

Is D.S.Reader free?

D.S.Reader is free to download, with no in-app purchases.

Is WonderCalc free?

WonderCalc is free to download, with no in-app purchases.

Do D.S.Reader or WonderCalc have ads?

D.S.Reader shows ads; WonderCalc does not.

Which is updated more often, D.S.Reader or WonderCalc?

D.S.Reader ships an update monthly, and WonderCalc every 5 days. Most recently, D.S.Reader was updated on September 28, 2026 and WonderCalc on September 30, 2026.