Spindle Books

Name: Spindle Books
Author: iPortfolio Inc.

iPortfolio Inc.

⬇ 10,000+ downloads

Est. actual: 14,946

Free

Released: Oct 7, 2018

No in-app purchases

No ads

Rated: Everyone

Signals

3 this week · 1 positive · 2 warnings All of this week's signals →

📈Last 7 days +4 installs — 86% slower than the week before (+28) · 1/day since Sep 30
🏆Among Education apps top 50% by installs gained this week (1707 peers growing)
🛠Updates dormant · updated 412 days ago

Installs since launch

+55 installs since Sep 30

Update history

4.0.24 Sep 25, 2025 · seen Oct 1, 2026

사용성 개선

Only the current version so far — new entries appear as the app ships updates.

Spindle Books is an education app by iPortfolio Inc. with 10,000+ downloads (about 15K estimated). +4 installs in the last 7 days. Released Oct 7, 2018. Install growth, rank history, SDKs and ad networks.

From the store listing: “Spindle Books ™ is an advanced reading program that is optimized for world-proven language learning. Spindle Books ™ applies a learning principle to make your child Bilingual. In particular, by introducing a learning method called "5-step multi-dimension reading", you can experience 5 times higher learning intensity.…”