Acumo
The English words and phrases you keep mixing up.
Most vocabulary apps teach words you already half-know. Acumo works on the pairs that actually cost you marks: adverse and averse, flout and flaunt, discreet and discrete. Look a word up and it shows you what you will confuse it with and the one line that separates them, then drills the pair until the difference sticks. Built for B2 to C2, free to use, no ads, no subscription, and it works entirely offline.
Free
A complete app, not a trial- The whole confusable engine: what you will mix a word up with, why, and the one line that tells them apart
- Definitions in plain English, written against a 2,800-word defining vocabulary, so the definition is never harder than the word
- A real example sentence on every curated entry, with the collocations that go with it: make a decision, not do a decision
- A note on why a word trips you specifically, written for your first language rather than for learners in general
- Four card types, including discrimination: choosing between two confusables in context
- Search, a share extension and manual add, so a word Acumo does not have still ends in an action
- Ready-made collections, your own list, and drills you can leave and pick up where you stopped
- VoiceOver, Dynamic Type and right-to-left support throughout, on iPhone, iPad and Mac
- Fully offline: no account, no network, nothing to sign up for
Pro
One-time purchase, no subscription- Spaced repetition that shows each item exactly when you are about to forget it
- Weak-item targeting, so a session drills what you keep getting wrong rather than what you already know
- Progress and retention: your real retention rate, and the pairs you keep confusing
- A due count on the Home Screen widget, and grading a card without opening the app
- Anki-compatible export, plus backup and restore, so your list survives a new phone
Pro buys the retention system, never the content. Pay once, with no renewals and no ads, tied to your Apple ID so you can restore it after reinstalling.
Built on confusion
Five kinds of mix-up drive the whole app: homophones, near-homophones, look-alikes, usage pairs and phrasal-verb families. That is the product, not a feature bolted onto one.
Not a dictionary, not for beginners
Written for B2 to C2. No streaks, no XP, no cartoon mascot. Nuance is the whole point, so the app talks to you like an adult who already speaks English.
Private and offline
No account, no tracking, no data collected. The entire collection ships inside the app and every lookup runs on your device.
One fair price
Free is complete, not crippled: the confusable engine is never for sale. Pro is one purchase, never a subscription.