Comparison

Blue2Factor vs isPrime?

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

Head to head

Blue2Factor

Smarter authentication

Free

🔧 Utilities

★ 5.01 ratingsView app →

About

Blue2Factor

This app offers seamless and secure authentication using proximity, biometrics, and encryption. It integrates with SAML for single sign-on, creating a frictionless user experience.

Highlights

Invisible first and second factor authentication
Single sign-on via SAML
Proximity verification
Biometric authentication
Asymmetric encryption
Frictionless and secure environment

Read full description

Blue2Factor provides invisible first and second factor authentication, and single sign-on through SAML integration. Blue2Factor supports proximity verification, biometrics, and asymmetric encryption to create a seamless, frictionless, and secure environment.

About

isPrime?

Features

Read full description

It's a fast prime number checker.

Screenshots

Blue2Factor4 screens

isPrime?4 screens

Verdict

The call

The clearest difference is update cadence: isPrime? at daily against Blue2Factor's every 2 months. Blue2Factor's advantage is device support (4 vs 2). On price, ads, in-app purchases 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

Blue2Factor ships an update every 2 months, isPrime? daily. The most recent releases landed on October 1, 2026 and October 7, 2026 respectively.

Scorecard2 real differences · 7 level

Blue2Factor versus isPrime?: the parameters behind the verdict, then further details
Parameter	Blue2Factor	isPrime?
Price	Free	Free
Rating	5.0 (1 ratings) — better	—
Number of ratings	1 — better	—
Update frequency	Every 2 months	Daily — better
Ads	No	No
In-app purchases	No	No
Monetization	Free	—
Devices	iPhone, iPad, iPod, Mac — better	iPhone, iPod
Requires iOS	15.6	15.0 — better
Further details — not scored
Size	11 MB	0 MB
Age rating	4+	4+
Developer	Christopher McLain	Omer Faruk Mesebuken

In-app purchases

None

Blue2Factor

No in-app purchases

None

isPrime?

No in-app purchases

Questions

Is Blue2Factor free?

Blue2Factor is free to download, with no in-app purchases.

Is isPrime? free?

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

Do Blue2Factor or isPrime? have ads?

Neither Blue2Factor nor isPrime? shows ads.

Which is updated more often, Blue2Factor or isPrime??

Blue2Factor ships an update every 2 months, and isPrime? daily. Most recently, Blue2Factor was updated on October 1, 2026 and isPrime? on October 7, 2026.