You have been practicing out loud for months. The words come faster than they did, and you can hold a conversation without rehearsing it first. But some of the same tense and word-order errors keep returning.

That is not a defect in the app and more a shift in what you needed at the intermediate level. The only thing that helps push away those errors that keep coming back is practice, lots of practice.

What Speak is built to do

Speak is a speaking-first app built around a three-stage loop it calls the Speak Method: learn the phrases native speakers use, practice them until they are automatic, then apply them in open conversation with an AI tutor. Its own framing is explicit that these are real-situation phrases and patterns rather than grammar drills.

It does that job well. An independent review at Languatalk credits the speech recognition, polished interface and volume of speaking practice. The US App Store listing carries 4.8 stars across 57,000 ratings as of August 2026.

The same review is direct about the tradeoffs. The course structure works well for beginners, tutor lessons and vocabulary builders are largely absent from the intermediate and advanced levels, and the question-and-answer practice starts repeating itself higher up.

Two practical constraints matter for anyone comparing. Speak is mobile only, with no desktop version. And it teaches six languages: Spanish, French, Japanese, Korean, Italian and Chinese, plus English for speakers of fifteen other languages.

What Dioma is built to do

Dioma starts from the assumption that you can already produce something. Every exercise asks you to create language rather than recognize it, in writing and speaking, and the correction that comes back names what to fix and why rather than swapping in the right answer.

Behind that sits a curriculum that professional educators wrote and is aligned to CEFR standards: about 750 topic files across the three languages, with Spanish running from lower intermediate through advanced and French and Hebrew currently topping out at upper intermediate. Each language and level pair carries between 60 and 115 topic files. That coverage lets the system choose what comes next instead of waiting for you to ask.

Dioma’s limits are straightforward. It is not built for beginners, and it offers three languages against Speak’s six. If you cannot yet get a sentence out without freezing, you are likely better served by low-pressure conversation practice before you add structured correction.

How to tell which one fits you

The deciding question is not which app is better made. It is which of the two jobs you still have in front of you.

Reps are your bottleneck if you rehearse sentences before saying them, avoid speaking with people because of how it goes, or understand far more than you attempt out loud. Conversation practice with a machine that never gets impatient gives you a low-pressure way to attempt more language.

Correction is your bottleneck if you speak fairly freely and suspect you are doing it in the wrong tenses. The clearest sign is a mistake that has followed you for months because being understood never required you to fix it. Repetition can make that error more automatic.

One detail matters for that second group. Speak’s personalized study plan and frequent-mistake targeting sit on Premium Plus. On monthly billing, that tier is $39.99 against Dioma’s $29. On annual billing, the comparison is much closer: $164.99 for Speak Premium Plus and $156 for Dioma. Speak Premium costs $83.99 a year, but it does not include those two features.

How Speak and Dioma can fit together

These tools can be consecutive rather than competing. Conversation practice can help you speak more readily, and structured correction becomes more useful once talking stops being the hard part. Nothing about using one rules out the other. If you are learning Japanese or Korean, however, Dioma is currently not an option at all.

Dioma is built for the stage where your comprehension has outrun your accuracy: production tasks drawn from a leveled curriculum, corrections that explain the rule, and a record of your own recurring errors so practice keeps pointing at them. Both products use AI. They give it different jobs: what Dioma lets a model decide, and what it never does. It sits alongside your input habits and your speaking practice, not on top of them.

Frequently asked questions