# Hydra Pro by Shameer Salim vs MemDatStack

The clearest difference is in-app purchases: MemDatStack at none against Hydra Pro by Shameer Salim's 1. MemDatStack also leads on update cadence (every 9 days vs every 3 weeks). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Hydra Pro by Shameer Salim sells 1 one-off in-app purchase. MemDatStack asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Hydra Pro by Shameer Salim against 5.0 for MemDatStack. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Hydra Pro by Shameer Salim ships an update every 3 weeks, MemDatStack every 9 days. The most recent releases landed on September 30, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Hydra Pro by Shameer Salim | MemDatStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/hydra-pro-by-shameer-salim/id6737815917/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/memdatstack/id6766251270/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 43 MB | 6 MB |
| Requires iOS | **17.6** | 18.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shameer Salim](https://appshunter.io/developer/1467684732) | [Circe Apps LLC](https://appshunter.io/developer/1896252845) |

## What reviewers say

### Hydra Pro by Shameer Salim

[App page](https://appshunter.io/ios/app/hydra-pro-by-shameer-salim/id6737815917)

This tool allows magicians and mentalists to create dynamic prediction templates that update an Instagram bio with real-time spectator input. It offers various capture methods and output destinations for seamless performance integration.

**Highlights:** Dynamic Instagram bio updates, Multiple capture methods (API, cards, numbers, book tests), Various output destinations, Guided setup wizard, Cloud sync for templates and settings, Companion app and accessory support

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hydra Pro | $149.99 | one-time |


### MemDatStack

[App page](https://appshunter.io/ios/app/memdatstack/id6766251270)

This tool assists magicians in memorizing card stacks with customizable quizzes. It supports various popular stacks and question types, offering detailed feedback on incorrect answers to improve learning.

**Highlights:** Supports multiple popular card stacks, Variety of quiz settings, Customizable quiz questions, Tracks recent quiz results, Reviews incorrect answers, Audio feedback option

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydra Pro by Shameer Salim free?

Hydra Pro by Shameer Salim is free to download, with in-app purchases available.

### Is MemDatStack free?

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

### Which has better reviews, Hydra Pro by Shameer Salim or MemDatStack?

Hydra Pro by Shameer Salim and MemDatStack are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Hydra Pro by Shameer Salim or MemDatStack have ads?

Neither Hydra Pro by Shameer Salim nor MemDatStack shows ads.

### Which is updated more often, Hydra Pro by Shameer Salim or MemDatStack?

Hydra Pro by Shameer Salim ships an update every 3 weeks, and MemDatStack every 9 days. Most recently, Hydra Pro by Shameer Salim was updated on September 30, 2026 and MemDatStack on September 21, 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.*