Hello Helsinki vs MemDatStack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Hello Helsinki
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Introducing "Hello Helsinki" – your go-to app for staying up-to-date with events in Helsinki, Vantaa, and Espoo. Whether you're into cultural happenings, great food, live music, or local experiences, "Hello Helsinki" has got you covered. Discover and save events to your phone's calendar, and bookmark your favorites, including events, venues and organizers. Powered by the Linked Events API from the City of Helsinki, the app gathers event information from trusted sources like Helsinki Marketing, Helsinki Cultural Centres, and the Helmet metropolitan area public libraries. Experience the city's pulse at your fingertips with "Hello Helsinki"!
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.
- Supports multiple popular card stacks
- Variety of quiz settings
- Customizable quiz questions
- Tracks recent quiz results
- Reviews incorrect answers
- Audio feedback option
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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
Verdict
The clearest difference is update cadence: MemDatStack at every 9 days against Hello Helsinki's every 17 months. On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Hello Helsinki ships an update every 17 months, MemDatStack every 9 days. The most recent releases landed on September 5, 2026 and July 3, 2026 respectively.
| Parameter | Hello Helsinki | MemDatStack |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 17 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 18.6 | 18.6 |
| Further details — not scored | ||
| Size | 11 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Hoang Nam Nguyen | Circe Apps LLC |
In-app purchases
Hello Helsinki
No in-app purchases
MemDatStack
No in-app purchases





