# PortSIP UC vs Iota Kappa Lambda

The clearest difference is update cadence: PortSIP UC at fortnightly against Iota Kappa Lambda's every 2 months. 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.

PortSIP UC ships an update fortnightly, Iota Kappa Lambda every 2 months. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | PortSIP UC | Iota Kappa Lambda |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (93 ratings)](https://appshunter.io/ios/app/portsip-uc/id426903818/reviews)** | — |
| Number of ratings | **93** | — |
| Positive reviews | 25.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Free | — |
| Size | 52 MB | 70 MB |
| Requires iOS | 12.0 | **11.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [PortSIP Solutions, Inc.](https://appshunter.io/developer/426903821) | [Ricardo Cumberbatch](https://appshunter.io/developer/1455104172) |

## What reviewers say

### PortSIP UC

[App page](https://appshunter.io/ios/app/portsip-uc/id426903818)

This SIP-based softphone allows users to make and receive calls and instant messages over Wi-Fi or cellular data. It integrates with a PBX for push notifications and offers advanced call management features, including video conferencing. Security is a priority with encrypted signaling and audio.

**Highlights:** SIP-based calling and messaging, Push notifications with PBX integration, Contact list integration, Multi-call management, Video conferencing, Secure call signaling and audio encryption, HD video calls up to 1080P

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Iota Kappa Lambda

[App page](https://appshunter.io/ios/app/iota-kappa-lambda/id1556858950)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is PortSIP UC free?

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

### Is Iota Kappa Lambda free?

Iota Kappa Lambda is free to download, with no in-app purchases.

### Do PortSIP UC or Iota Kappa Lambda have ads?

Neither PortSIP UC nor Iota Kappa Lambda shows ads.

### Which is updated more often, PortSIP UC or Iota Kappa Lambda?

PortSIP UC ships an update fortnightly, and Iota Kappa Lambda every 2 months. Most recently, PortSIP UC was updated on October 12, 2026 and Iota Kappa Lambda on October 7, 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.*