VocaX vs Duolingo: One Teaches a Language, One Tracks 74,334 Due Dates

Duolingo is built for learning a language itself — its own site says its courses teach reading, writing, listening and speaking. VocaX is built for a word list you already have: IELTS, TOEFL or GRE — but not a list of your own, which VocaX cannot import. Plenty of people use both, and the two do not overlap.

One boundary first: VocaX does not teach grammar, does not teach writing and does not do conversation — grammar and sentence structure are not in it. Starting a language from zero, or wanting to practise speaking, is not what it is for.

1. What is each one actually for?

Duolingo is a language course: it starts from the language itself and teaches you to read, write, listen and speak it. VocaX is a word-list trainer: it turns 74,334 dictionary entries and a dozen or so word lists into exercises and serves them to you by each card's own due date. One starts from a language. The other starts from the list you are already holding.

Those are not two phrasings of the same thing. They are two different starting points. Duolingo starts from "you do not speak this language yet." VocaX starts from "you already have a list of words to learn."

Duolingo describes its own lessons as quick and bite-sized, with points earned and new levels unlocked as you go, covering reading, writing, listening and speaking (duolingo.com). It also runs a separate product, the Duolingo English Test — that is an exam, not a course, and this page does not cover it.

VocaX starts from content that is already made: 74,334 entries across its word lists, from primary-school basics up to advanced GRE vocabulary. Those entries, their definitions, example sentences and illustrations are all preset — you cannot create a card, and you cannot rewrite the front (the word) or the back (the meaning) of one that exists. Section 3 goes into that.

2. Same fifteen minutes a day — how are the paths different?

Duolingo's path is course order. VocaX's path is due-date order.

Duolingo moves you down a course: each lesson is short, finishing a unit opens up a Legendary challenge, and according to its Help Center one of the Super Duolingo benefits is a personalised lesson after you make a mistake. Its anchor is which unit you have reached.

Duolingo asks which unit you have reached. VocaX asks when this word was last practised, and which of three abilities comes due first.

VocaX has no units; it is anchored to time. Translation, Dictation and Speaking each keep their own progress, and your next review is whichever of the three comes due earliest. So what you see each day is not "the next lesson" but "what came due". The three formats are Translation (see the word, pick its meaning from four options), Dictation (hear the pronunciation, type the spelling) and Speaking (read the word aloud; Apple's speech recognition transcribes it on the device, and no pronunciation score is given). How the three differ is set out in three abilities that have to be trained separately, and why a four-option question is the easiest one to misjudge yourself on is in four options versus active recall.

Two more numbers you set yourself: how much you do each day, 10 to 1,000 cards in steps of 10, 50 by default; and which batch you drill, from seven practice sources — a word list's studied or full set, the scenario library's studied or full set, favourites, search history and flagged items. The full derivation of when a word comes due is in how review timing is calculated.

3. How far does each one go, and what can't it do?

On Duolingo we state only what it publishes about itself, and we do not judge it for you: its courses cover reading, writing, listening and speaking with real-world communication as the goal, and according to its Help Center the lesson content is the same for all users — the paid tier buys experience, not content (no ads, Unlimited Hearts, personalised practice, unlimited attempts at Legendary challenges). We have no data on Duolingo, and we are not going to guess at what it cannot do.

Every line about Duolingo in that table comes from Duolingo's own website or Help Center. Any Duolingo feature missing from it is missing because we did not verify it — and what we have not verified, we do not write.

VocaX's boundaries we spell out in full, because it is our product.

• No grammar, no writing, no conversation practice. It handles words only: an entry's definitions, inflected forms, register, derivatives, synonym and antonym notes, collocations, bilingual context stories, phonetics, pronunciation and illustration. Grammar and sentence structure are not in there.
• Apple platforms only. No Android version and no web version. The system integrations — Spotlight search, the Control Center control, camera lookup — are Apple features in the first place.
• No creating or rewriting cards. There is no add-on or plug-in system, no shared decks, and no way to import a word list of your own.
• Speaking does not grade your pronunciation. The transcription comes from Apple's speech recognition running on the device, It tells you what was heard, and does not rate your accent.
• Zero push notifications. There is no system notification anywhere in the app. The only automatic prompt is the in-app review reminder, fixed at 50 minutes of accumulated visible time on the card screen, and it stays silent when nothing is due for review. You can switch it off in settings. The reasoning is in why we don't nag you.
• Subscription only, with no buy-out. US$59.99 a year (¥298 in China), monthly also available, 7-day trial.

The free tier deserves its own paragraph, because it is easy to misread as a trial. VocaX's free tier is a complete product: the word lists, the practice, the pronunciations, the illustrations and the scenario explanations consume no quota, have no counter, and keep working indefinitely. Only six features are counted per use, because each one calls a cloud AI model — AI translation (four styles and grammar analysis share one bucket) at 20 a day, AI word lookups at 50 a day, one insights report for life, and five sessions each per week of scenario audio, word music and review. Subscribed, AI translation becomes 1,000 a day, insights reports arrive weekly with history, and those last three stop being counted weekly; AI word lookups stay at 50 a day, which is why we do not sell it as a benefit. Impressionist is the free one of the the themes and the other four are a subscription benefit, as is the outlook trend inside Memory Insights. The full table is in what is free in VocaX.

4. Why we made the choices we made

Three things we deliberately did not build.

No hearts, and no penalty for getting one wrong. A wrong answer files the word as a flagged item automatically; you can mark it done by hand, and reopen one you had marked done. No quota changes either way — our quota table has six entries and none of them keys off right or wrong. That is not an argument that hearts are wrong: Unlimited Hearts is one of Duolingo's Super benefits, and it plainly solves a real problem for some people. We simply did not want "fear of losing something" to be the reason you open the app. How flags actually work is in flags turn mistakes into signal.

No push notifications. When you are not in the app, we never appear. The cost of that is real: if you need an external push, this will feel empty, and we say so in the article linked above rather than dodging it.

No making your own cards. The lists and the card faces are finished by us, which saves you the time spent deciding what a card should say. The price is that you cannot change it, including where we got it wrong.

All three are trade-offs, not findings. We cannot point to any research showing that withholding hearts or notifications helps anyone remember more words, and we are not going to imply otherwise. Duolingo treats habit as part of the design — its Help Center describes the streak as a proven way to motivate daily practice — and that is a different problem from the one we are solving.

One judgement, stated plainly: if I had to learn a new language, I would open Duolingo and would not feel I had settled for anything. What it does and what VocaX does do not overlap. The comparison in the other direction — who should build their own cards — is in VocaX vs Anki.

5. When VocaX is the wrong choice — and when you should not replace Duolingo

VocaX cannot help you if:

1. You are starting a language from zero. A word-list trainer will not teach you grammar or how sentences are put together.
2. You want to speak and to follow real speech. VocaX's Speaking format is you reading one word aloud, not a conversation.
3. What you have to memorise is not a word list — lecture notes, a paper, clinical cases, contract language. It cannot be added.
4. You are not on iOS, or your studying moves between an Android phone and a Windows laptop.
5. You will not take a subscription and want a one-time purchase.

You should not replace Duolingo if:

1. You have a streak going. According to its Help Center a streak is the number of days in a row you have completed a lesson, and a streak freeze or a streak repair can be bought with gems; VocaX does not even display that number, so switching means cutting the line.
2. Your goal is to learn the language, not to finish a word list. The first is what a course is for, and VocaX does not do it.
3. You need something to push you. Duolingo has practice reminders you can enable with a time you choose; VocaX sends no notifications, and its only prompt lives inside the app, fixed at 50 minutes, counted only while you have the app open.

The people who genuinely need both are in one specific situation: learning a language with Duolingo while also facing an exam that comes with a defined word list. Those two things never conflicted in the first place.

FAQ

Is Duolingo enough for learning vocabulary?

It depends on which batch of words you need, not on which app is better. Duolingo's courses are organised around a language; if your goal is that a specific list of words should be recognisable, spellable and sayable, what you need is training organised around that list. We have no data at all on how well Duolingo teaches vocabulary, so this page does not judge it — that would need their data, not ours.

What do the free versions of Duolingo and VocaX each include?

According to Duolingo's Help Center, its lesson content is the same for all users, and Super Duolingo's benefits are no ads, Unlimited Hearts, personalised practice and unlimited attempts at Legendary challenges. VocaX's free tier is a complete product you can keep using: the word lists, practice, pronunciations, illustrations and scenario explanations consume no quota and have no counter. Only six features are counted per use — 20 AI translations a day, 50 AI word lookups a day, one insights report for life, and five sessions each per week of scenario audio, word music and review.

Can I use Duolingo and VocaX at the same time?

Yes, and for a lot of people that is the sensible answer. Duolingo covers how to use the language; VocaX covers when a given word should be practised again. The two keep separate records, neither reads or writes the other's, and there is nothing to migrate or sync.

Does VocaX teach grammar? Can it replace Duolingo?

No, and it cannot. VocaX entries carry definitions, inflected forms, register, derivatives, synonym and antonym notes, collocations and example sentences — but there is no grammar syllabus, no sentence-structure work, no writing and no conversation. If your question is how the language fits sentences together, VocaX has no answer.

I have a long Duolingo streak. What happens to it if I switch?

The streak stays with Duolingo. It is not an exportable asset, and VocaX has nothing to attach it to — we do record consecutive practice days, but no screen in the app displays that number and no reward, badge or reminder hangs off it. If the streak matters to you, leave it where it is.

Axiom One LLC — VocaX. Pricing, features and figures reflect the current shipping build; statements about Duolingo are based on its public website and Help Center as of 2026-09-15. Figures in this article are current as of 2026-09-15.