quietmoneyRetain
An AI flashcard study app: upload course slides, AI generates exam questions with answers, and an adaptive spaced-repetition algorithm schedules your reviews.
Retain is an AIOne-line growth story, compiled by us from public sources; speculation is marked separately below.
Checkout visits over time
Checkout: checkout.stripe.com
1. Productwhat it sells, to whom, and how it charges
- Product
- An AI flashcard study app: upload course slides, AI generates exam questions with answers, and an adaptive spaced-repetition algorithm schedules your reviews.
- Users
- University students and exam candidates in Europe such as Germany, France, Switzerland and Austria, especially medical students who need to memorize a great deal
- Positioning
- Positioned against Anki, selling automatic question generation and a review algorithm claimed to be 20% more efficient than Anki's SM-2, focused on non-English European markets such as German and French
- Pricing
- Free to sign up and use; paid prices not found Free tier: yes Source: Homepage
- Team
- small team
- Acquisition entry points on site
- creator program, app store
- Sharing mechanics
- shareable results Easily share your decks and flashcards with just a link. Anyone who has this link will be able to clone your deck.
- Price source
- retain.cards
“Easily share your decks and flashcards with just a link. Anyone who has this link will be able to clone your deck.”Quote from the site
2. Channelswhere new users come from and what the traffic looks like
New-user source: Viral (Built-in sharing). Traffic is all direct visits (71.3%) and brand search (28.7%, "retain cards", "retain cards gratuit", "metodo retain"); new users are classified as viral: users can share decks by link and others clone them in one click; the homepage also has a Creator Program. There is no referral or social source data, and ChatGPT brings a small 0.06% of traffic. Returning users come back directly to review on schedule.
Last month's traffic sources
Semrush source breakdown (desktop)
Five-class attribution
| Attributable new users, last month | Share |
|---|---|
| 100% |
Direct + brand search 100%. Direct and brand search count as viral only when the site shows sharing mechanics; the largest share wins, under 5% means Other.
Countries
| Country | Share of visits |
|---|---|
| Germany | 25.51% |
| France | 24.27% |
| Switzerland | 13.83% |
| Austria | 7.18% |
| Netherlands | 6.77% |
Countries (Semrush): Germany 46.5%, France 16.2%, Austria 6.6%, Switzerland 4.6%, Argentina 4.4%
Language
Multilingual: mainly English, plus German, French, Polish, Spanish, Portuguese, Italian, Japanese, Turkish and Hindi
AI assistants
| Source | Share |
|---|---|
| ChatGPT | 0.06 |
AI referrals (Semrush): ChatGPT 80 (0.06%)
Keywords
207 keywords · brand ~100% · organic 93.68% / paid 6.32%
| Similarweb top 5 keywords |
|---|
| retain cards |
| retain |
| retrain |
| retain cards gratuit |
| metodo retain |
Referrer categories
| Category | Share of referrals |
|---|---|
| Computers Electronics and Technology - Other | 5.5% |
| Education | 1% |
Site metrics (Similarweb, last month)
- Visits, last 3 months
- 165.7K (3 months)
- Visits MoM
- +47.89%
- Country rank
- Germany #23950
- Category rank
- Science and Education/Education #393
- Bounce rate
- 32.34%
- Pages / visit
- 9.78
- Visit duration
- 00:03:34
- Industry
- Education
- Top 3 channels
- Organic Search › Direct › Referrals (top channel 45.55%)
- Semrush monthly visits
- 3 months ago 80,248 · 2 months ago 68,510 · Last month 126,080 Semrush scale, ~3–4× Similarweb
- Semrush organic / paid search visits
- 43,269 / 49
- Semrush source breakdown (desktop)
- Direct 62.6%, google.com · Google organic 24.1%, stripe.com 7.1%, bing.com 1.1%
3. Growth pathhow the first users arrived and what kept it growing
Classification
Basics
Timeline
Growth loop
Revenue and scale clues
Confidence and gaps
Other sites that started via “Paid ads”
Similar sitessame category, also growing via Viral
FAQ
How many checkout visits does Retain get per month?
About 12,894 last month (Similarweb estimate), #270 of 606; the month before was 4,712. Opening checkout is not paying, so this is not revenue.
Where do Retain's new users come from?
New-user source: Viral (Built-in sharing). The site has invite or share mechanics, and direct plus brand search is the largest source Traffic is all direct visits (71.3%) and brand search (28.7%, "retain cards", "retain cards gratuit", "metodo retain"); new users are classified as viral: users can share decks by link and others clone them in one click; the homepage also has a Creator Program. There is no referral or social source data, and ChatGPT brings a small 0.06% of traffic. Returning users come back directly to review on schedule.
How much does Retain cost?
Free to sign up and use; paid prices not found
Dossier confidence: medium. Parts 1 and 2 come from reading the site and Similarweb data; part 3 from public reporting, founder posts, Wayback snapshots, WHOIS and similar, with speculation marked.
The number: checkout visits is Similarweb's estimate of visits from the site to a checkout payment page; opening checkout is not paying, so this is not revenue. Small sites land on fixed buckets.
Data through last month. Page updated 2026-10-26.