# Convex Programmer's Calculator vs ChipVault

The clearest difference is in-app purchases: Convex Programmer's Calculator at none against ChipVault's 1. Convex Programmer's Calculator also leads on ratings volume (6 vs 1). ChipVault's advantage is update cadence (weekly vs every 8 months) and rating (5.0 vs 4.7). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ChipVault sells 1 one-off in-app purchase. Convex Programmer's Calculator asks for nothing beyond the download.

ChipVault holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Convex Programmer's Calculator has 6 ratings behind it against 1, so its average is the more settled of the two.

Convex Programmer's Calculator ships an update every 8 months, ChipVault weekly. The most recent releases landed on June 11, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Convex Programmer's Calculator | ChipVault |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (6 ratings)](https://appshunter.io/ios/app/convex-programmers-calculator/id1021414602/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chipvault/id6772799276/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 0 MB | 7 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Matthew Daigle](https://appshunter.io/developer/1021414601) | [N0AGI LLC](https://appshunter.io/developer/1895395504) |

## What reviewers say

### Convex Programmer's Calculator

[App page](https://appshunter.io/ios/app/convex-programmers-calculator/id1021414602)

Convert numbers between hexadecimal, decimal, octal, and binary. Perform byte flips, bit shifts, and calculate two's complement. Features bit indicators and word grouping for improved binary readability.

**Highlights:** Number base conversion, Two's complement calculation, Byte flipping for endianness, Left and right bit shifting, Binary readability enhancements, Copy, paste, and clear functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### ChipVault

[App page](https://appshunter.io/ios/app/chipvault/id6772799276)

This app transforms NFC cards into secure, encrypted personal data vaults. Store passwords, recovery phrases, and more, all protected by your master password and AES-128 encryption directly on the chip. Your data remains offline, with no cloud or server reliance.

**Highlights:** Personalize DESFire EV2/EV3 cards, AES-128 encrypted data storage, Store passwords, notes, recovery phrases, Edit card details and categories, Clone cards for backup, Visual storage usage, Reset cards to factory state

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChipVault Full Access | $6.99 | one-time |


## Frequently asked questions

### Is Convex Programmer's Calculator free?

Convex Programmer's Calculator is free to download, with no in-app purchases.

### Is ChipVault free?

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

### Which has better reviews, Convex Programmer's Calculator or ChipVault?

ChipVault is rated higher. Convex Programmer's Calculator averages 4.7 out of 5 from 6 ratings, while ChipVault averages 5.0 from 1 ratings.

### Do Convex Programmer's Calculator or ChipVault have ads?

Neither Convex Programmer's Calculator nor ChipVault shows ads.

### Which is updated more often, Convex Programmer's Calculator or ChipVault?

Convex Programmer's Calculator ships an update every 8 months, and ChipVault weekly. Most recently, Convex Programmer's Calculator was updated on June 11, 2026 and ChipVault on September 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*