Comparison

NoteifyApp vs Sigma

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

Head to head

Multi feature calculator

Free

🎬 Entertainment

No ratingsView app →

About

NoteifyApp

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Turn a borrowed iPhone into your personal mind-reading device with Noteify, offering multiple ways to secretly peek and transmit information What Can You Do with Noteify? Super Clean Mind Reading: Reveal their thoughts. Transmit Predictions: Instantly Create Predictions on a borrowed phone, Hands-off Confabulation: Use the powerful Accomplice Mode for truly hands-off routines, leaving no trace of the magic. For Entertainment purpose only!

About

Sigma

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Multi Featured calculator app - with an entertaining bonus feature to mess with your friends! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

NoteifyApp2 screens

Sigma4 screens

Verdict

The call

The clearest difference is iOS requirement: NoteifyApp at 16.0 against Sigma's 18.0. 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. NoteifyApp sells 1 one-off in-app purchase and Sigma sells 2 in-app purchases, starting at $119.99 per year. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 6 days. The most recent releases landed on November 8, 2026 and November 13, 2026 respectively.

Scorecard1 real difference · 5 level

NoteifyApp versus Sigma: the parameters behind the verdict, then further details
Parameter	NoteifyApp	Sigma
Price	Free	Free
Update frequency	Every 6 days	Every 6 days
Ads	No	No
In-app purchases	Yes	Yes
Devices	iPhone, iPad — better	iPhone
Requires iOS	16.0 — better	18.0
Further details — not scored
Size	43 MB	8 MB
Age rating	4+	4+
Developer	Pratik Shirsat	MAJOR Productions LLC

In-app purchases

1 purchases

NoteifyApp

One-time1

Noteify$309.00

2 purchases

Sigma

Subscriptions1

Sigma Cloud Services1 Year trial$119.991 Year

One-time1

Sigma$1000.00

Questions

Is NoteifyApp free?

NoteifyApp is free to download, with in-app purchases available.

Is Sigma free?

Sigma is free to download, with in-app purchases available.

Do NoteifyApp or Sigma have ads?

Neither NoteifyApp nor Sigma shows ads.

Which is updated more often, NoteifyApp or Sigma?

NoteifyApp ships an update every 6 days, and Sigma every 6 days. Most recently, NoteifyApp was updated on November 8, 2026 and Sigma on November 13, 2026.