Shellf vs Bookly

I need to say this upfront: Bookly and Shellf aren’t really competitors. They answer fundamentally different questions. Bookly answers ‘How do I read more?’ Shellf answers ‘What should I read next?’

Bookly’s entire design revolves around the reading timer. You start a session, you read, you stop, you log your pages. Over time it calculates your reading speed, predicts when you’ll finish a book, and tracks your progress against daily, monthly, and yearly goals. It even has ambient sounds — rain, café noise, fireplace — to help you settle into a session. It’s a habit-building machine, and a good one.

Shellf has none of that. No timer, no streaks, no ambient sounds, no reading speed. What Shellf does instead is learn what you like. You rate books, and the AI recommendation engine maps your taste into a high-dimensional space using embeddings and LLM reasoning. It figures out that you love unreliable narrators, slow-burn character arcs, and morally grey protagonists — not just that you like ‘fantasy.’ Then it finds books that match those specific patterns.

So the question isn’t really ‘which is better’ — it’s ‘what problem are you trying to solve?’ And honestly, for a lot of readers, the answer might be both.

This is Bookly’s home turf and I’m not going to pretend Shellf competes here, because it doesn’t. When I used Bookly, the reading timer impressed me immediately. You tap start, read your book, tap stop, log the pages you reached. Simple. But the magic is in what Bookly does with that data. They’ve nailed this.

Over multiple sessions, Bookly calculates your reading speed in pages per minute, estimates how long it’ll take to finish your current book, and tracks your progress against configurable goals — daily minutes, monthly pages, yearly book counts. The streak system adds gentle accountability. The ambient sound library (rain on a window, crackling fireplace, café ambience) is a small touch that actually helps some readers focus. I know people who open Bookly just for the ambient sounds.

Bookly also has a ‘Book Characters’ feature for tracking character relationships — genuinely useful if you’re reading epic fantasy with 50 named characters and you’ve forgotten who is allied with whom.

Shellf has absolutely nothing in this category. No timer, no speed tracking, no goals, no streaks, no ambient sounds. I don’t have plans to add a reading timer because I think Bookly already does it well, and I’d rather focus on what Shellf does differently. If you need a reading timer, Bookly is the answer.

This is why Shellf exists, and it’s the category where the gap is widest. Bookly has Bloo — an AI chatbot you can talk to about books and ask for suggestions. It’s conversational and can give you reasonable recommendations if you describe what you’re looking for. From what I’ve seen, it’s essentially a chat interface on top of a language model. As far as I can tell, it doesn’t learn from your library, it doesn’t analyse your ratings over time, and it doesn’t build a persistent model of your taste.

Shellf’s recommendation engine is architecturally different. Every book you rate gets mapped into a high-dimensional embedding space. The system doesn’t just know you rated a book 4 stars — it understands the book’s themes, narrative style, pacing, and emotional arc, and it triangulates those against everything else in your library. Combined with LLM reasoning, it generates recommendations with explanations: ‘Because you loved the unreliable narrator in X and the slow-burn character development in Y, you might connect with Z.’

I’ll be honest about the limitation: Shellf’s AI needs data. If you’ve rated fewer than 15 books, the recommendations will be decent but not magical. Once you’re past 30 rated books, it starts surfacing the kind of surprising, niche picks that you can’t get from any chatbot or bestseller list. That’s the sweet spot.

If discovery is a nice-to-have for you and you mainly want a reading timer, Bookly’s Bloo chatbot might be enough. But if you’re the kind of reader who’s always chasing the next great book — especially if you’ve already read the obvious picks in your genres — Shellf’s engine is in a different league.

Bookly and Shellf both have strong stats, but they measure completely different things. This is one of those categories where ‘winner’ genuinely depends on what matters to you.

Bookly excels at per-session statistics. Because it tracks every reading session with a timer, it can tell you your reading speed, how many minutes you read today, your average session length, how many pages you read this week, and your projected finish date for your current book. If you’re trying to build a reading habit and need to see that daily progress, Bookly’s stats are motivating and precise.

Shellf takes a library-wide view. You get books read over time, pages read, monthly trends, genre breakdowns, fiction vs non-fiction splits, and a taste fingerprint that shows what themes and qualities you gravitate toward. Shellf Plus adds AI-generated reader insights — connections between your favourites, patterns in what resonates with you, and analysis of how your taste has evolved. Shellf doesn’t track individual sessions, so it can’t tell you how fast you read or how long you spent today.

If you want ‘How am I reading?’ stats — speed, time, consistency — Bookly wins. If you want ‘What am I reading?’ stats — patterns, taste evolution, genre insights — Shellf wins. Different data, different purposes.

Bookly Pro costs $29.99/year. Shellf Plus costs $18/year. On raw price, Shellf is 40% cheaper. But the bigger difference is what you get for free.

Bookly’s free tier is, frankly, restrictive. It feels designed to push you toward Pro rather than give you a genuinely usable experience. Core features like Goodreads import, detailed statistics, and many customisation options are locked behind the paywall. I’ve seen users describe the free version as ‘basically a demo,’ and that matches my experience too.

Shellf’s free plan includes unlimited book tracking, full library organisation with custom shelves and tag rules, complete reading stats, DNF tracking with reasons, notes with voice dictation, and 100 AI recommendation credits — enough for months of discovery. No time limit, no credit card required. The free plan is genuinely usable long-term.

Shellf Plus at $18/year unlocks 2,000 AI recommendation credits, advanced reader insights, and priority features. But the key difference is that Shellf’s free tier doesn’t feel crippled. You can use Shellf indefinitely without paying and still get real value. I can’t honestly say the same about Bookly’s free tier.

To be completely transparent: my long-term goal is to make everything free, funded by affiliate revenue from book purchases. The Plus tier exists primarily as a safeguard against AI credit overconsumption while that business model matures. At $18/year the price is deliberately kept at a ‘no brainer’ level — it’s not designed to be a meaningful revenue driver.

This is the section I actually want you to read. Bookly and Shellf are more complementary than they are alternatives. They barely overlap.

Bookly is your reading companion — the app you open when you sit down to read. Start the timer, settle into the ambient sounds, track your session, log your pages, watch your streak grow. It makes the act of reading more intentional and measurable.

Shellf is your reading advisor — the app you open when you’ve just finished a book and want to know what to pick up next. Browse your AI recommendations, explore why a particular book might resonate with you, check your taste fingerprint to see how your reading patterns are evolving.

Using both costs $48/year combined ($30 for Bookly Pro + $18 for Shellf Plus), or you could use Bookly Pro with Shellf’s free tier for $30/year and still get 100 AI recommendation credits per month. Either way, you’d have a reading timer that actually works and a discovery engine that actually learns.

I genuinely think the combination is stronger than either app alone. I built Shellf because I couldn’t find good AI recommendations anywhere — not because I had a problem with reading timers. If Bookly helps you read more, and Shellf helps you read better things, that’s a pretty good stack.