# Alpha Tau Lambda vs Justacall

The clearest difference is in-app purchases: Alpha Tau Lambda at none against Justacall's 1. Alpha Tau Lambda also leads on iOS requirement (12.0 vs 14.0). Justacall's advantage is update cadence (monthly vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. Justacall sells 1 in-app purchase, starting at $2.99 per month. Alpha Tau Lambda asks for nothing beyond the download.

Alpha Tau Lambda ships an update every 9 months, Justacall monthly. The most recent releases landed on September 18, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Alpha Tau Lambda | Justacall |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Monthly** |
| Size | 69 MB | 112 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ricardo Cumberbatch](https://appshunter.io/developer/1455104172) | [Kevin Augustin](https://appshunter.io/developer/1761501290) |

## What reviewers say

### Alpha Tau Lambda

[App page](https://appshunter.io/ios/app/alpha-tau-lambda/id1621987654)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Justacall

[App page](https://appshunter.io/ios/app/justacall/id6615068119)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly plan | $2.99 | per month |


## Frequently asked questions

### Is Alpha Tau Lambda free?

Alpha Tau Lambda is free to download, with no in-app purchases.

### Is Justacall free?

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

### Do Alpha Tau Lambda or Justacall have ads?

Neither Alpha Tau Lambda nor Justacall shows ads.

### Which is updated more often, Alpha Tau Lambda or Justacall?

Alpha Tau Lambda ships an update every 9 months, and Justacall monthly. Most recently, Alpha Tau Lambda was updated on September 18, 2026 and Justacall on September 27, 2026.

---

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