Echo: N-Back Math

Train focus & working memory

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

You can scroll for an hour but can't hold three numbers in your head. Echo is the opposite of the feed — quiet, demanding, finite. Just you and what you remember. You just spent an hour scrolling and remember none of it. That's not your fault. Every other app is built to fragment your attention and hand it back in small, restless pieces. Echo does the opposite. A number appears. A few seconds later, another. Add the new one to the number you saw a few steps back — and type it before it slips away. No feed. No autoplay. No bottomless content. Just one number at a time, and the quiet pressure of holding something in your head. It's deceptively hard, and that's the point. The more it pulls on your short-term memory, the more it asks for the one thing the feed never does: your full attention. — Three difficulties: look back 1, 2, or 3 steps — Path mode: levels that ramp from gentle to merciless — Hands-free Voice mode: it reads each number and listens for your answer, in English or Mandarin — eyes off, screen down — A signature echo tone, synthesized live, on a pitch-black canvas — Streak and best score — no leaderboard to perform for — Fully offline. No account. No ads in your face. Echo Pro (one-time, optional): every stage's 2-back and 3-back levels, plus unlimited Voice mode. Buy once. No subscription. Put the feed down for ninety seconds. See how long your streak lasts.

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The developer, AprilNEA LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Usage Data
    • Diagnostics

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Information

Seller
  • AprilNEA LLC
Size
  • 10.4 MB
Category
  • Puzzle
Compatibility
Requires iOS 16.0 or later.
  • iPhone
    Requires iOS 16.0 or later.
  • Mac
    Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English and Simplified Chinese
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © 2026 AprilNEA LLC
  • Developer Website
  • Privacy Policy