Change Calculator vs 2FA Hub
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Change Calculator
Quickly calculate the correct change to give for any transaction. Ideal for cashiers, small businesses, or personal use to ensure accuracy at the point of sale.
- Calculate change in seconds
- Enter total bill amount
- Tap amount paid
- Immediate change display
- Useful for sales and businesses
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Change Calculator tells you what to hand back, the moment you tap the cash you were given. Made for the market stall, the yard sale, the bake sale and the school fair: anywhere you take cash without a till. It also works the other way round, so you can check that the cashier got it right. HOW IT WORKS 1. Type the bill. 2. Tap the coins and notes the customer handed you. 3. Read the change. The app also shows which coins and notes to give back. WHAT'S IN THE DRAWER • Over 150 currencies, each with its real coins and notes. The app starts with the currency of your device; switch with one tap. • Hide the denominations you never see, so your drawer matches your stall. • Undo a wrong tap, reset for the next customer, haptic feedback on every tap. • Dark mode, and a layout made for iPad. • Works completely offline. PRIVACY No ads, no accounts, no analytics. Nothing is tracked and nothing leaves your device. CHANGE PRO A single optional purchase that supports development and removes the occasional upgrade prompt. Everything else is included for everyone.
2FA Hub
Generate and transfer two-factor authentication (2FA) TOTP accounts to smartwatches. Once transferred, tokens can be generated directly from your watch, eliminating the need for your iPhone. Supports various smartwatch brands and offers secure account backups.
- 2FA TOTP account generation
- Transfer 2FA accounts to smartwatches
- Generate tokens directly from watch
- Support for Apple, Fitbit, Samsung, WearOS watches
- Local, iCloud, and Google Drive backups
- Support for different crypto algorithms
- Data protection via Key Chain API
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2FA Hub is designed to create and transfer 2FA TOTP accounts to Apple, Fitbit, Samsung or WearOS smartwatches. After transition is completed, iPhone is no longer required to generate a token, since it could be taken directly from a targeted watch device. All recent Fitbit, Apple, many Samsung and WearOS smartwatches are supported. A free application will be required to connect to a Fitbit device or Samsung device. You can find all information about the application and Fitbit, Samsung or WearOS watches integration options in the wiki referenced by "Support URL" 2FA Hub can be also used as a generic 2FA token generator independently of your smartwatch devices. It includes useful features such as: 1. Account backups to local iPhone filesystem, iCloud or Google Drive storage. 2. Support for different crypto algorithms and for variable token lengths 3. Data protection utilizing Apple's Key Chain API and strong cryptographic algorithms on iPhone or iWatch devices Backup feature takes advantage of password based encryption, which makes backups portable between different platforms. Legacy backups created by another mobile application described in "Support URL" can be used by this app to import your existing legacy accounts from a different platform. More smartwatches will be supported by the app in the future, but we need you support and positive feedback to make it happen
Screenshots
Verdict
The clearest difference is review sentiment: 2FA Hub at 100% against Change Calculator's 43%. 2FA Hub also leads on rating (5.0 vs 2.2) and update cadence (weekly vs every 32 months). Change Calculator's advantage is price (Free vs $3.99) and ratings volume (13 vs 1). On 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
Change Calculator is free to download; 2FA Hub costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
2FA Hub holds the better App Store score, 5.0 against 2.2. That said, the two scores are not equally well evidenced: Change Calculator has 13 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 43% of Change Calculator's written reviews are positive against 100% of 2FA Hub's.
Change Calculator ships an update every 32 months, 2FA Hub weekly. Both last shipped on October 10, 2026.
| Parameter | Change Calculator | 2FA Hub |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 2.2 (13 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 42.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 13 — better | 1 |
| Update frequency | Every 32 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 17.0 | 14.1 — better |
| Further details — not scored | ||
| Size | 1 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Alain Stulz | Oleg Gryb |
Customer experience
Change Calculator
2FA Hub
In-app purchases
Change Calculator
No in-app purchases
2FA Hub
No in-app purchases
Questions
Is Change Calculator free?
Is 2FA Hub free?
Which has better reviews, Change Calculator or 2FA Hub?
Do Change Calculator or 2FA Hub have ads?
Which is updated more often, Change Calculator or 2FA Hub?
Other comparisons
