# Zulip vs COSAction

The clearest difference is review sentiment: COSAction at 100% against Zulip's 39%. COSAction also leads on rating (4.9 vs 3.7) and monetization model (free vs free with in-app purchases). On price, ratings volume, update cadence and ads there is nothing between them.

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

COSAction holds the better App Store score, 4.9 against 3.7. Both are backed by a comparable volume of ratings — 16 and 11 respectively. Written reviews point the same way: 39% of Zulip's written reviews are positive against 100% of COSAction's.

Zulip ships an update monthly, COSAction fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Zulip | COSAction |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (16 ratings)](https://appshunter.io/ios/app/zulip/id1203036395/reviews) | **[4.9 (11 ratings)](https://appshunter.io/ios/app/cosaction/id1482603474/reviews)** |
| Number of ratings | **16** | 11 |
| Positive reviews | 39.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 44 MB | 39 MB |
| Requires iOS | 15.0 | **10.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Kandra Labs, Inc.](https://appshunter.io/developer/1194159660) | [Citizens for Self-Governance](https://appshunter.io/developer/1248810421) |

## What reviewers say

### Zulip

[App page](https://appshunter.io/ios/app/zulip/id1203036395)

This app provides organized team chat for groups of any size, enabling users to read and respond to messages in context. It helps maintain focus by allowing users to catch up on topics of interest at their own pace. The application is open-source and available as a cloud service or self-hosted solution.

**Highlights:** Organized team chat, Contextual message reading, Topic-based conversations, Focus maintenance, Open-source software, Cloud and self-hosted options

**Features:** Vision Pro support

**In-app purchases:** none


### COSAction

[App page](https://appshunter.io/ios/app/cosaction/id1482603474)

Empower grassroots activists with tools to connect with state legislators and build local support teams. Access news, track legislative actions, and utilize a phone outreach tool to advance constitutional amendments.

**Highlights:** Legislator contact tools, Volunteer team building, News articles, Action reports, Notifications, Phone outreach tool

**In-app purchases:** none


## Frequently asked questions

### Is Zulip free?

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

### Is COSAction free?

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

### Which has better reviews, Zulip or COSAction?

COSAction is rated higher. Zulip averages 3.7 out of 5 from 16 ratings, while COSAction averages 4.9 from 11 ratings.

### Do Zulip or COSAction have ads?

Neither Zulip nor COSAction shows ads.

### Which is updated more often, Zulip or COSAction?

Zulip ships an update monthly, and COSAction fortnightly. Most recently, Zulip was updated on October 24, 2026 and COSAction on October 24, 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.*