Spine vs Understory
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spine
Organize your reading life by creating tiered lists of books you've finished. Track your reading progress, see what friends are reading, and discover personalized recommendations.
- Create book tier lists
- Track reading progress
- Follow friends' reading habits
- Discover personalized recommendations
- Import Goodreads library
- Log start and finish dates
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Your profile is a tier list. Rank every book you finish, follow friends, and find what to read next. Import your Goodreads library in a few taps. Follow your friends and see what they're reading, create a blend, share books that mattered, recommend books. [ READING LOG ] Mark books read, currently reading, or queued. Note when you started, when you finished, and what you thought. [ TIER LISTS ] S, A, B, C, D. Easily drag-and-drop your favorites into a tier list. [ FRIENDS ] See what your people have read. Let them know what you've read and what you think about it. [ DISCOVER ] Personalized recommendations based on what you’ve read, rated, and exactly what you're specifically looking for. [ IMPORT ] Easily bring your Goodreads library over. Mr. Bezos won't miss you.
Understory
This app helps you track your reading progress, set goals, and build a consistent reading habit. It features a unique plant aesthetic and allows you to grow real-world trees by meeting reading objectives. Connect with friends, share recommendations, and view insightful reading statistics.
- Log reading progress and books
- Set reading goals and streaks
- Grow real-world trees by meeting objectives
- Connect with friends and join book groups
- Share book recommendations
- View reading statistics and insights
- Organize custom reading lists
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Understory is a reading tracker, book tracker, and social reading app designed to help you track books, log reading progress, set reading goals, and stay consistent. Whether you’re organizing your bookshelf, building a reading habit, or joining a book group, Understory brings together everything you need in one place with a fun plant aesthetic. Join the Understory bookish community to build a better reading habit and build a better world! GROW REAL-LIFE TREES: Watch your garden bloom in Understory and meet monthly objectives to grow real-world trees! Visit friends’ gardens daily to help their trees grow! INTERACT WITH FRIENDS: Join book groups where you and your friends can read different books! Like and comment on reviews in the social feed! TRACK YOUR READING: Review your books with half stars, audiobook tags and private reads! Manage your library with custom reading lists including a Did Not Finish (DNF) list! LEVEL UP YOUR READING: Improve your reading habit with leaderboards for books read, reading streaks, and XP level! Earn XP by logging reading and interacting with other users! SHARE BOOK RECS: See your friends’ favorite and highly rated books and share book recommendations directly with your friends! SEE YOUR STATS: Get insights on your reading history and social interactions through shareable stats and graphs and our signature Library Card graphic! Understory is perfect for readers who want to: - Track books and reading progress in one place - Build a daily reading habit and reading streak by growing a fun garden that doesn’t feel like a chore - Log books, reviews, and ratings (with half stars!) - Organize a TBR (to be read) list - Track audiobooks and ebooks - Join a social book community - Discover new book recommendations Terms of Use: https://www.understory-app.com/terms-of-use Privacy Policy: https://www.understory-app.com/privacy-policy Content and Copyright Policy: https://www.understory-app.com/content-copyright-policy
Screenshots
Verdict
The clearest difference is in-app purchases: Spine at none against Understory's 6. On price, rating, review sentiment and ratings volume there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Understory sells 6 in-app purchases, starting at $4.99 per month. Spine asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Spine against 4.9 for Understory. Both are backed by a comparable volume of ratings — 86 and 63 respectively. Written reviews are what separate them: 100% of Spine's written reviews are positive against 96% of Understory's.
Spine ships an update weekly, Understory every 9 days. Both last shipped on November 9, 2026.
| Parameter | Spine | Understory |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (86 ratings) — better | 4.9 (63 ratings) |
| Positive reviews | 100.0% of reviews — better | 95.8% of reviews |
| Number of ratings | 86 — better | 63 |
| Update frequency | Weekly — better | Every 9 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 42 MB | 213 MB |
| Age rating | 4+ | 12+ |
| Developer | Tanner Flake | Understory Studios LLC |
Customer experience
Spine
Understory
In-app purchases
Spine
No in-app purchases
Understory
- Understory Premium1 Month trial$4.991 Month
- Understory Premium - Monthly$4.991 Month
- Understory Premium1 Year trial$49.991 Year
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- Understory Premium - Yearly$49.991 Year
- Streak Freeze$0.99
- Streak Restore$0.99









