# CAL_ vs FlowCrypt

The clearest difference is update cadence: CAL_ at every 4 days against FlowCrypt's every 4 months. CAL_ also leads on iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CAL_ ships an update every 4 days, FlowCrypt every 4 months. The most recent releases landed on September 17, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | CAL_ | FlowCrypt |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (3 ratings)](https://appshunter.io/ios/app/flowcrypt-encrypted-email/id1591754995/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 4 months |
| Monetization | — | Free |
| Size | 9 MB | 28 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SQUAIR Inc.](https://appshunter.io/developer/1162347955) | [FlowCrypt a. s.](https://appshunter.io/developer/1591462991) |

## What reviewers say

### CAL_

[App page](https://appshunter.io/ios/app/cal-logging-calculator/id1162347956)

**Features:** macOS Compatibility

**In-app purchases:** none


### FlowCrypt

[App page](https://appshunter.io/ios/app/flowcrypt-encrypted-email/id1591754995)

Easily encrypt your emails and attachments with PGP for enhanced privacy on Gmail. This app simplifies end-to-end encryption, making it accessible even without technical knowledge of cryptography. Secure your communications and files effortlessly.

**Highlights:** End-to-end PGP email encryption, Secure attachment encryption, Key generation and secure storage, Encrypted drafts, Password-protected encrypted messages, Compatibility with OpenPGP standards

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CAL_ free?

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

### Is FlowCrypt free?

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

### Do CAL_ or FlowCrypt have ads?

Neither CAL_ nor FlowCrypt shows ads.

### Which is updated more often, CAL_ or FlowCrypt?

CAL_ ships an update every 4 days, and FlowCrypt every 4 months. Most recently, CAL_ was updated on September 17, 2026 and FlowCrypt on August 16, 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.*