Where a language app actually stops

Not "apps are bad" — apps are excellent at the thing they do. The model puts their ceiling at B1, and the reason is structural: nothing in an app corrects a sentence you have never said before.

Aug 8, 2026Kevin Fan

Every estimate on this site can return a refusal. The most common one is this: app-only study does not reliably reach B2.

That is a strong claim and it deserves an argument rather than an assertion.

What the model says

Our estimates multiply an FSI baseline by a factor for how you study. The app-only factor is not one number — it grows with the level you are aiming at:

Aiming at	App-only multiplier
A1	1.3×
C1	3.5×

And above B1 it stops being a multiplier at all, because the model marks the level unreachable.

Concretely, Spanish to B2 at an hour a day, five days a week:

Method	Hours	Reaches B2?
Living in-country	345	yes
Intensive class (FSI-style)	438	yes
1-on-1 tutor	460	yes
Structured self-study course	695	yes
App only	1,292	no

The 1,292 is shown struck through on the method chart, and the point of showing it is that it is not an answer. However many hours go in, the bar does not arrive.

Why the multiplier grows

This is the part worth understanding, because it explains why apps feel so effective at first and so stuck later.

At A1, an app is doing almost the right thing. The task is recognition and recall of a fixed set of forms. An app is a very good flashcard with a good scheduler, and the 1.3× penalty is mostly the absence of pronunciation feedback.

At B2, the task has changed. B2 is producing sentences you have not seen before, under time pressure, that are correct — and finding out when they are not. The skill is generating novel output and having it corrected.

An app cannot correct a sentence you invent, because it does not know what you were trying to say. It can only check whether you reproduced a sentence it already had. That gap does not close with more content or better software; it is what the medium is.

Hence the shape: cheap at the bottom, expensive in the middle, impossible at the top.

What this is not

Not "apps do not work". They are the best tool available for vocabulary and early forms, they are the reason many people start at all, and the free ones are genuinely free. Our recommendations include zero-commission options for exactly this reason.

Not a precise threshold. B1 is where the model places the ceiling; the real edge is fuzzy, depends on the app, and some people push past it by supplementing. A person doing app work plus conversation practice is not an app-only learner, and the model treats them differently.

Not a claim about any specific product. The ceiling is about the format, not the brand.

The practical version

If your target is A2 — travel, courtesy, reading signs — an app can take you there and the price is right.

If your target is B2 — work, study, arguing a point — the app is a component and not the plan. What is missing is corrected output, and the cheapest way to buy it is not another subscription. It is a person, for fewer hours than you think.

Work out what your own target costs by method, or read how the method factors were set, including which of them are estimates rather than published figures. Several are, and they are marked.

Posts resting on the same evidence, picked by shared citations rather than by hand.

A $260 course is cheaper than a $14 subscription, eventually
Comparing a one-off purchase with a monthly fee needs a time horizon, and language learning horizons are longer than people plan for. Getting this wrong once made us recommend a $260 course to someone with no budget.
Why self-study costs 30% more at A2 and 70% more at C1
The penalty for studying alone is not a constant. It grows with the level, because what you are learning changes from recall to production — and production needs someone to be wrong in front of.
How far the free route actually goes
This site earns commission on some courses and nothing at all on others. The free tools are genuinely competitive up to about B1, and the honest recommendation for most beginners is to spend nothing yet.
The plateau is not a plateau, it is the shape of the curve
Each CEFR level costs roughly as much as everything before it. So the point where progress stops feeling fast is arithmetically inevitable — and it is where most people quit.
What fifteen minutes a day actually gets you
Five years of fifteen-minute daily sessions reaches B1 Spanish by structured self-study, A2 by app, and A1 Chinese. The first year does not complete A1 in any language. Here is the arithmetic.

Sources

Every figure above, and where it came from. A post that traces other people's unsourced numbers does not get to have any of its own.

Foreign Language Training — US Department of State, Foreign Service Institute
The class-hour bands every estimate on this site starts from, and the definition of the proficiency they lead to (ILR Speaking-3 / Reading-3).
Guided learning hours — Cambridge English
The shape of the curve between CEFR levels. Cambridge publishes cumulative hours per level (A2 180–200, B1 350–400, B2 500–600, C1 700–800, C2 1,000–1,200); our level factors are normalised against the C1 band and every one lands inside its published range.