How arcoco works
English vocabulary practice through meanings, sentences and games, on iPhone and Android.
arcoco is an English vocabulary game for iPhone and Android. It is for people who already understand English and want more words to choose from. A short self-assessment gives you a starting point. From there, you meet words in different contexts and return to them as you play, with your Journal keeping track of your practice.
What do you actually do?
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Find a starting point
A short check asks which words feel comfortable. That starting point, along with your later answers, helps shape the practice.
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Explore meanings and contexts
Some activities ask you to match a word to its meaning. Others give you a sentence gap to fill or a picture to consider.
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Play with words you are learning
In Pressure Test, catch matching words before the piranhas do. In River Runner, steer through the right word gates. Formats become available as you progress.
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Return and review
Words come back for practice. Open the Journal to revisit them and see their progress. The labels describe how you are doing in the app; they are not a formal assessment of your spoken English.
One word from arcoco’s vocabulary
Meticulous
Showing extreme care and attention to every detail.
Think of someone checking the position of every tiny window on a model before displaying it. You could call them careful. “Meticulous” tells you more about the attention they are giving each detail.
The word and definition come from arcoco; the model example is an illustration for this guide. Games, prompts and their order vary with your progress.
See the practice
iPhone screenshots. The appearance and available formats can vary by version and progress.
Platforms, free access and accounts
Product details checked 19 October 2026 against the store listings and support information. Check your store for current availability and local prices.
| Feature | iPhone | Android - first release |
|---|---|---|
| Free access | 7 free games a day in the first week, then 4 a day. | Free to use, with no purchases or subscriptions. |
| Paid options | Optional arcoco Plus adds unlimited games and Streak Shield. See the app for local prices and plan terms. | No arcoco Plus upgrade in this release. |
| Sign-in | Not required to play. Apple or Google sign-in is optional for saving and restoring progress. | No account or cloud backup. Progress stays on the device. |
| Ads | No ads. | No ads. |
| Offline use | Practice is stored on your phone. Backup and purchases need a connection. | Setup and play work offline. |
For purchase help, progress saving and data handling, see Support and our Privacy Policy. No account required does not mean the iPhone app collects no data.
Who is it for?
You should already be comfortable using English, whether you are a native speaker or a confident learner. Parents considering it for a teenager can read our guide to vocabulary practice for reluctant readers aged 13+ and review the game’s content and difficulty together. arcoco is not directed at under-13s.
What does it not cover?
arcoco is not a complete beginner English course, a pronunciation coach, speech therapy or an exam preparation programme. It gives you vocabulary practice through games. We have not established through a controlled study that playing improves spontaneous speech or school results.
Current store listings: App Store · Google Play.