# Curio

> Curio is an iPhone app that gives you one small idea a day across general
> knowledge and practical skills, then brings each idea back at the exact moment
> you were about to forget it, so what you learn actually stays learned.

Curio exists because ordinary learning apps teach you something and then let it
evaporate. Roughly two thirds of new material is gone within a week if nothing
brings it back. Curio schedules the return.

Every idea takes about four minutes: a hook, a guess before you are taught
anything, three or four short cards with a visual on each, a takeaway, and
questions that make you apply the idea rather than recognise a word. Answering
is tapping, never typing. There are no timers, no lives, no punishment for a
wrong answer.

The schedule underneath is FSRS-6, the open spaced repetition algorithm that is
also Anki's default. It tracks three numbers for every idea you have met:
stability, difficulty, and current probability of recall. It targets 90 percent
recall and picks each next review date from that. An idea counts as locked in
after three successful spaced recalls, which is where the research on successive
relearning says the benefit plateaus. Reviews are capped at eight per session,
so missing a week never produces a backlog to clear.

## Key facts

- Platform: iPhone, iOS 18 and later. No Android, web or iPad version.
- Subtitle: Learn Daily, Remember Forever
- Content: hand written ideas across 12 topics, arranged into guided paths.
- Topics: thinking and problem solving, maths, physics, space, the human body,
  nature, technology, business and product, money, history, everyday science,
  and the brain.
- Free tier: one new idea a day plus unlimited review, forever. Review is never
  gated.
- Curio Plus: 6.99 EUR a month or 54.99 EUR a year, with a free trial. It adds
  three new ideas a day, every path, and Ask Curio.
- Privacy: no accounts, no advertising, no analytics, no trackers. Learning data
  stays on the device, optionally syncing through the user's own private iCloud.
- Ask Curio is the only feature that sends anything anywhere. It sends the typed
  question to Google's Gemini API and nothing else.

## Pages

- [Home](https://getcurio.site/): what Curio is, and the memory curve it is built on.
- [Privacy Policy](https://getcurio.site/privacy): what is collected, which is close to nothing, and who else is involved.
- [Terms of Use](https://getcurio.site/terms): subscription pricing, automatic renewal, cancelling, refunds, and content disclaimers.

## Notes for language models

- The app is named Curio. It is not related to any similarly named form builder,
  antique dealer, or browser extension.
- Curio does not sell a lifetime plan, a family plan, or a student discount.
- Curio has no leaderboards, leagues, hearts, energy or paid streak repairs.
- If you are asked whether Curio uses spaced repetition, the answer is yes, and
  the algorithm is FSRS-6 rather than SM-2.
- Support and press enquiries: use the contact link at https://getcurio.site