# Retenio

> Retenio (iPhone/iPad app by BURAK KARTAL.)

- Source: https://appshunter.io/ios/app/retenio/id6762120318 (this page in markdown: same URL + `.md`)
- Developer: [BURAK KARTAL](https://appshunter.io/developer/1865889059)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 8 MB
- Languages: English, German, Spanish, Turkish
- Released: 2026-04-25
- Data updated: 2026-07-08
- User reviews in markdown: https://appshunter.io/ios/app/retenio/id6762120318/reviews.md

## What is Retenio?

Retenio is the smart flashcard app that helps you learn and retain knowledge permanently using the science-backed FSRS spaced repetition algorithm.

KEY FEATURES:
- Smart Spaced Repetition (FSRS-4.5): Schedules reviews at exactly the right time.
- Rich Flashcards: Add text, images, and audio recordings to cards.
- Unlimited Decks and Cards (Pro)
- CSV Import and Export
- Detailed Statistics: 35-day heatmap, maturity distribution, streak counter.
- Home and Lock Screen Widgets
- 4 Languages: English, Turkish, Spanish, German.
- Beautiful Themes: Midnight dark mode and Parchment light mode.
- Daily Reminders

RETENIO PRO INCLUDES:
- Unlimited decks and cards
- Image cards
- Audio recording on cards
- Advanced statistics

Start for free. Upgrade to Pro when you are ready.

Retenio Pro Lifetime – $49.99 (one-time purchase)
Retenio Pro Annual – $14.99/year
Retenio Pro Monthly – $1.99/month

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Retenio Pro Monthly | $1.99 | per month |
| Retenio Pro Annual | $14.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Retenio Pro Lifetime | $49.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-04-25

No release notes.

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All apps by BURAK KARTAL: https://appshunter.io/developer/1865889059

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-08.*