Scientific Calculator Plus 991 subscription: cost, reviews, how to cancel

• App Store rating4.7★ from 12,288 ratings
• Cheapest subscription$1.99 per month
• Reviews mentioning billing, last 12 months5 of 99 reviews

On this page: what it costs, how to cancel, what reviewers say.

What the data says

No label applies: the numbers below sit inside the normal range for apps of this size.

What Scientific Calculator Plus 991 costs

Download: Free. Subscriptions start at $1.99 per month.

• Calculator month subscriptionRenews every month, no trial$1.99
• Calculator yearly subscriptionRenews every year, no trial$3.99

How to cancel Scientific Calculator Plus 991

1. Open Settings on your iPhone and tap your name at the top.
2. Tap Subscriptions.
3. Select Scientific Calculator Plus 991 (listed under a plan name such as Calculator month subscription).
4. Tap Cancel Subscription and confirm. You keep access until the end of the paid period.

If the app is not in that list, it was not billed through Apple. Cancel it with the developer instead: support page or website.

Charged after cancelling or during a trial? Request a refund at reportaproblem.apple.com within 90 days.

What reviewers say

Reported bugs

Keyboard input stops working after switching screens; Incorrect calculation results for certain operations; App crashes on some devices after recent update.

Recent one-star reviews

adsi’m seeing half naked girls as ads like wtf

incorrectwhen typed in for example -2^2 it gives -4 when in reality you cannot get a negative when something is squared

ДробиОтветы показывает в дробях, нет возможности вывести в научном формате или десятичных дробях

Recent five-star reviews

It helped me so much with my English assignment!! So good!So basically I had a task to write a story about a bear, and I wanted to write about Winnie the Pooh. I planned this splendid story about how Winnie needed honey and then asked Piglet for some. It the thing was, I did not know how to spell delishous! Well, I downloaded this calculator and it helped…

Brilliant Scientific CalculatorFantastic tool for study and everyday practice. Still exploring its numerous modules (or features).

Like it!It has awesome features!

About the developer

Tran Duy has published on the App Store since Apr 3, 2019: 2 app(s), 0 of them no longer in the store.

• Ncalc - Graphing Calculator 844.6★

Alternatives to Scientific Calculator Plus 991

• Symbolab - AI Math Solver App4.6★
• Photomath4.8★
• Mathway: Math Problem Solver4.9★

Also similar: Ncalc - Graphing Calculator 84 (4.6★), Taculator 84 Graphing Calc (4.5★), Maple Calculator: Math Solver (4.7★)

Questions people ask

How much does Scientific Calculator Plus 991 cost?

Download: Free. Subscriptions start at $1.99 per month.

How do I cancel Scientific Calculator Plus 991?

On your iPhone open Settings, tap your name, tap Subscriptions, select Scientific Calculator Plus 991 and tap Cancel Subscription. You keep access until the end of the paid period.

Does Scientific Calculator Plus 991 have a free trial?

No plan lists a free trial in the US App Store.

Is NCalc Scientific Calculator + free to use?

The application is available for free download and use, but it does contain in-app purchases. This means that while the core functionality is accessible, certain advanced features or content may require a purchase to unlock.

Scientific Calculator Plus 991 in one paragraph

Scientific Calculator Plus 991 by Tran Duy is a Education app for iPhone. Download: Free. Subscriptions start at $1.99 per month across 2 plan(s). App Store rating 4.7 from 12,288 ratings. 5 of 99 reviews in the last 12 months mention charges, subscriptions, refunds or cancelling (5%). The developer has 2 app(s) on the App Store, 0 no longer listed. Cancel through Settings › Subscriptions on the iPhone. Data verified Sep 8, 2026 by AppsLupa.

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