# Tether | algorithm vs RollCall

The clearest difference is in-app purchases: Tether | algorithm at none against RollCall's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. RollCall sells 2 in-app purchases, starting at $3.99 per month. Tether | algorithm asks for nothing beyond the download.

Tether | algorithm ships an update weekly, RollCall every 5 days. Both last shipped on October 3, 2026.

## The numbers

| Metric | Tether | algorithm | RollCall |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (3 ratings)](https://appshunter.io/ios/app/rollcall-group-challenges/id6744109694/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 71.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 34 MB | 10 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 12+ |
| Developer | [Jason Hindley](https://appshunter.io/developer/1774084587) | [Sky Enterprises Australia Pty Ltd](https://appshunter.io/developer/1806101331) |

## What reviewers say

### Tether | algorithm

[App page](https://appshunter.io/ios/app/tether-algorithm-free-social/id6736961386)

**Features:** Apple Wallet

**In-app purchases:** none


### RollCall

[App page](https://appshunter.io/ios/app/rollcall-group-challenges/id6744109694)

This social app transforms group chats into daily photo challenges for friends. Complete the challenge or face a group-decided punishment. Compete to keep your group's streak alive and share laughs.

**Highlights:** Daily photo challenges, Group-decided punishments, Streak tracking, Photo voting and flagging, Group interaction

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RollCall+ Monthly | $3.99 | per month |
| RollCall+ Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Tether | algorithm free?

Tether | algorithm is free to download, with no in-app purchases.

### Is RollCall free?

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

### Do Tether | algorithm or RollCall have ads?

Neither Tether | algorithm nor RollCall shows ads.

### Which is updated more often, Tether | algorithm or RollCall?

Tether | algorithm ships an update weekly, and RollCall every 5 days. Most recently, Tether | algorithm was updated on October 3, 2026 and RollCall on October 3, 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.*