Comparison

Hydra Pro by Shameer Salim vs MemDatStack

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Hydra Pro by Shameer Salim

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
Read full description

Hydra Pro is a professional performance tool for magicians and mentalists, designed for an exclusive community of performers. Access requires a one-time In-App Purchase of $149.99. WHAT IT DOES Create prediction templates that dynamically update your Instagram bio with real-time data. HOW IT WORKS • Create a template with an opener, a capture method, and a closer. • Tap Perform — the app captures the input and posts it to your Instagram bio. • The spectator checks your bio and sees their thought written there. CAPTURE METHODS (included with purchase) • Live API Polling — connect to services like Inject, Lumen, WikiTest, Goo, Elips, and more.. • Playing Cards — value and suit selection via swipe gestures • Numbers — digit capture via swipe input • Book Tests — word selection from customizable word lists • URL Schemes — receive predictions from companion apps OUTPUT DESTINATIONS • Instagram Bio (primary) • Glyphs Portal • Motherboard • QR Genie • Apple Watch companion • Bluetooth accessories (Lumen Duo, Lumen Eye, PeekSmith) KEY FEATURES • Guided setup wizard — create your first template in under a minute • Multiple themes — Neon Violet, Dark Blue, Luxury Gold, Midnight Green • Cloud sync — templates and settings backed up automatically • Post-prediction notifications — know when your bio is updated • Per-template configuration — each template remembers its own settings • Background polling — the app stays active while you perform COMPANION SUPPORT • Apple Watch — see captured values on your wrist • Bluetooth accessories — Lumen Duo, Lumen Eye, PeekSmith • URL Schemes — integrate with Nexus, Glyphs, Omega Board, Subliminal, Icons, Timesmith, and any app that supports URL callbacks BUILT FOR PERFORMERS Designed by performers, for performers. Every detail is crafted to make your performance seamless. * Access requires a one-time In-App Purchase of $149.99. * Requires an active Instagram account for bio updates. Internet connection required for API polling and cloud sync.

About

MemDatStack

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
Read full description

A highly configurable tool to help magicians trying to memorize a stack of cards. Pick from multiple commonly used stacks, indicate which cards in the stack you believe you already know, choose from a variety of quiz settings, and take quizzes to help you learn your stack. You can see your recent quiz results, and review any questions you got incorrect. Supported stacks: Mnemonica, Aragon, Aronson, Particle System, Redford, Joyal Supported questions: Card to Location, Location to Card, Card Before, Card After Quiz options: multiple choice, number of multiple choices, questions per quiz, optional time limit to answer, delay after correct/incorrect answers, audio feedback, ask more often about cards/locations you've recently gotten incorrect

Screenshots

Hydra Pro by Shameer Salim4 screens
MemDatStack4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Hydra Pro by Shameer Salim versus MemDatStack: the parameters behind the verdict, then further details
ParameterHydra Pro by Shameer SalimMemDatStack
PriceFreeFree
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings2 — better1
Update frequencyEvery 3 weeksEvery 9 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS17.6 — better18.6
Further details — not scored
Size43 MB6 MB
Age rating4+4+
DeveloperShameer SalimCirce Apps LLC

In-app purchases

1 purchases

Hydra Pro by Shameer Salim

One-time1
  • Hydra Pro$149.99
None

MemDatStack

No in-app purchases

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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