Iro AIIro AI Blog
Nibble is a microlearning app built on the same promise as the rest of the category: five minutes a day, and in a year you will know something. The promise is real, but it is doing a lot of hidden work, because five minutes of reading and five minutes of practice compound into very different things.
Editorial note: Iro AI is our app. Where it appears below we say so, and it has to earn its spot by the same criteria as everything else.
Choose the subject first, then the app. Every microlearning app runs the same loop, and the loop works. What decides whether you get anything out of a year of it is what you pointed it at.
If the subject is using AI tools well, Iro AI. If it is maths, logic or computer science, Brilliant. If it is academic foundations and you would rather not pay, Khan Academy. If you genuinely want to graze across many topics for pleasure rather than capability, stay in the general microlearning category, and pick on which app's writing you enjoy reading.
Worth doing the arithmetic once, because it changes how you pick.
Five minutes a day is about thirty hours a year if you rarely miss. Thirty hours is a serious amount of time. It is roughly a university module, or a good chunk of the way to competence at something narrow and well-defined.
It is also nothing at all if you spread it thin. Thirty hours across twelve unrelated topics is two and a half hours each, which buys you the ability to recognise the words and not much else. That is the quiet trade in every general microlearning app: breadth feels productive daily and produces very little annually.
The second variable is what the five minutes consists of.
Thirty hours of doing-shaped practice on one subject is a genuinely different outcome from thirty hours of reading-shaped sessions across twelve. Same daily commitment, same streak, different year.
Iro AI turns ideas like the ones in this post into 5-minute exercises with feedback. Free tier, Pro from $4.17 a month ($49.99 a year, 7-day free trial).
Three, and the first is the most common thing anyone says about any app in this category.
What we could verify, and an honest blank where we could not.
| App | Best for | What you get | Free tier | Platforms |
|---|---|---|---|---|
| Nibble | Bite-size general knowledge | Short microlearning sessions across topics | Not verified by us | Not verified by us |
| Iro AI (ours) | Using AI tools well | 29 curated paths, 477 lessons, 2,700+ exercises across 24 exercise types | Every path open, paced by a Battery that gives a lesson a day and recharges overnight | iOS and a free web app with no signup. Android in development. |
| Brilliant | Maths, logic, CS foundations | Curated interactive problem sets | Not verified by us | iOS, Android, web |
| Khan Academy | Academic foundations | Curated courses and exercises, from a non-profit | Free, with no paid tier | iOS, Android, web |
About the blank cells. Anything marked "not verified by us" is something we could not confirm from the company's own store listing or website at the time of writing. Most comparison pages fill those cells from affiliate sites, which is how a wrong price ends up repeated on twenty pages. We would rather leave a gap and send you to the listing. Check the renewal price and the cancel path before you enter a card, on any app here, including ours.
Iro is the version of this bet that concentrates the thirty hours. One subject, using AI tools well, across 29 curated paths covering ChatGPT, Claude, Gemini, Perplexity, prompt engineering, agents and automation: 477 lessons and 2,700+ exercises across 24 exercise types.
And the sessions are doing-shaped. The Prompt Lab has you write an actual prompt and then tells you which part was weak, scoring clarity, specificity, constraints and context. Other exercises have you catch a fabricated citation in an answer that reads perfectly well, or pick between two tools and learn why the other one loses. Duels run the same material against another learner matched by rating, which is a different kind of pressure and a good test of whether you actually know it.
Streaks, XP and six ranks do the same habit work as any app in this category. The Battery paces new lessons at one a day and recharges overnight, so a missed day costs a day rather than a number.
Open app.tryiro.com and do one lesson. Two minutes tells you more about whether the format works for you than any comparison page, including this one.
Iro AI turns ideas like the ones in this post into 5-minute exercises with feedback. Free tier, Pro from $4.17 a month ($49.99 a year, 7-day free trial).
Pick by subject rather than by app, because the format barely differs across the category. For using AI tools well, Iro AI: 29 curated paths, 477 lessons and 2,700+ hands-on exercises. For maths, logic and computer science, Brilliant. For academic foundations at no cost, Khan Academy. If you want broad general knowledge for enjoyment, staying in the general microlearning category is a reasonable answer.
We could not confirm Nibble's current free tier or pricing from the company's own listing, so we are not printing a number. This category changes prices often and by region. Open the App Store or Google Play listing, read the in-app purchase section, and check the renewal price rather than the introductory one.
Yes, with two conditions. Five minutes a day is roughly thirty hours a year, which is enough to get genuinely competent at something narrow. It buys you almost nothing if you spread it across a dozen unrelated topics, and it compounds far better when the five minutes is spent producing something and getting feedback rather than reading an explanation and confirming you followed it.
Because the streak measures attendance, not learning. If the fastest way to keep it is to tap through a reading-shaped lesson, that is what most people will do, and familiarity with a topic fades quickly under any real pressure. The fix is not more discipline; it is a session format where you have to produce something and can therefore find out what you got wrong.
Scope and session shape. Iro covers one subject, using AI tools, in depth: 29 curated paths and 2,700+ exercises across 24 exercise types. And the sessions ask you to do things rather than read them, with a Prompt Lab that grades prompts you write on clarity, specificity, constraints and context, plus head-to-head duels matched by rating. It runs on iOS and as a free web app at app.tryiro.com with no signup.