Web app
Open SecondBook in your browser — your full library, reader and sync.
Open web appSecondBook
Your books, at the center.
SecondBook is a personal book platform built around one thing — the book. Read it, keep your whole library in sync, see what your collection is worth, and find your next one. Trading books comes next.
- Android
- iOS
- Cloud sync
- Offline
- Cross-device
LibraryOnline
Search books, files, notes
The Master and MargaritaOn this device · 68%
Clean ArchitectureIn the cloud
Sync statusNotes and progress up to date
Progress68%
Demo
See SecondBook in action.
A short product walkthrough is on the way.
App
SecondBook App
One place for every way into SecondBook — read, store and sync your books across your devices in your personal library.
Google Play
Closed beta on Google Play.
Open in Google PlayAndroid beta (join)
Join the closed test (invited testers).
Join Android betaiOS
Open beta on TestFlight now — App Store coming later.
Join TestFlight betaTelegram Mini App
Open SecondBook right inside Telegram, no install.
Open in TelegramSupport
Questions? Email us at support@secondbook.kz.
Contact support
Founder
Built by a reliability-driven founder.
Ilnur Stybayev
Founder · product owner · reliability & quality engineer · AI operator — a combination that rarely lives in one person.
Technical Product Owner · AI Product Engineer · 12+ years
Founder & Technical Product Owner at SecondBook · AI Product Engineer · Mobile FinTech · QA Automation · CI/CD · AI Agents · Product Delivery
SecondBook is not a no-code side project. It is engineered by someone who spent 12+ years in systems where quality cannot be faked — and that engineering DNA is exactly why the app is built the way it is.
A feature isn’t done until it’s proven in a real user scenario.
An engineering arc where reliability was never optional.
- Radio-engineering foundationA formal radio-engineering education underneath everything — the habit of reasoning about a system from first principles.
- Aerospace & radar reliabilityTelemetry analysis, anomaly detection and system checks on spacecraft control systems — where a missed defect has real consequences.
- Fintech, trading & banking qualityQA and quality leadership across mobile banking, brokerage and trading systems — money-moving flows that have to be right every time.
- SecondBookFounder and builder — turning that reliability culture into a book platform, shipped with the same discipline.
Why SecondBook is built this way
The rigor isn’t decoration. Coming from aerospace and fintech, I build SecondBook on the rules those domains demand: one source of truth, one canonical path, controlled fallback instead of dead ends, device-proof before “done”, AI-assisted audit on every change, and UI states that never lie to the user.
I use AI agents not as a toy, but as an engineering operating system — planning, implementation, audit, forensic analysis, release readiness and documentation. AI proposes and accelerates; a human makes the final call.
What I optimise for
Products that work not only in tests, but in real user flows: app → backend → database → object storage → local device state → user-visible result.
Founder proof
- Mobile fintech
- Brokerage & trading systems
- Banking flows
- Aerospace / radar telemetry
- Anomaly detection
- CI/CD
- Release gates
- QA automation
- Observability
- API & DB validation
- Root-cause analysis
- AI-assisted engineering
- AI agents
- MCP servers
- Local LLM tooling
- S3
Education
B.Sc. Radio Engineer — Military Engineering Institute of Radio Electronics and Communications (2008–2013). Yandex School of Data Analysis — Software Testing Engineer (2022).
Open to serious product and engineering conversations — mobile, fintech, AI, SaaS.
What SecondBook does today.
Everything in this section is live in the app right now — nothing here is a promise.
AssistanceAvailable now
AI that actually helps.
In-app help and support backed by an AI assistant that can even read the photos you attach. It analyses and proposes — a human always stays in control.
- Ask for help without ever leaving the app.
- The assistant can read the screenshots and photos you send.
- AI proposes; people make the final call.
ReadAvailable now
Read almost anything.
The reader is the heart of the app. Open the formats you actually have — books, documents, comics, code — and read them the way you like.
- EPUB
- TXT
- FB2
- MOBI
- DOCX
- CBR
- CBZ
- DJVU
- MD
- HTML
- images
- code
- Highlights, notes and bookmarks that stay with the book.
- Built-in dictionary, in-book search and adjustable fonts.
- Light, dark and paper themes for comfortable reading.
- Even opens plain text, Markdown, HTML and code files.
LibraryAvailable now
Your library, on every device.
A local-first library that works offline and keeps your reading life in sync. Your notes and progress follow you from phone to phone.
- Collections, favorites and reading stats in one place.
- Notes, highlights, bookmarks and progress sync across devices.
- Works offline first — open your books with no connection.
- Manage your devices and see where each book lives.
ValueAvailable now
See what your collection is worth.
SecondBook gives your library a read-only valuation — a simple view of value and how it moves over time. It’s your books as an asset, nothing more.
- Read-only valuation of your book collection.
- Track total value and its movement over time.
- Non-custodial — you own your books; we never hold money.
No wallet, no deposits, no withdrawals — valuation only.
DiscoverAvailable now
Find and add a book in seconds.
Search the full catalog, scan a barcode, or add a book by hand. Whatever you’re looking for, it takes seconds.
- Full catalog with search and filters.
- Voice search for when typing is a hassle.
- Scan an ISBN barcode to add a book instantly.
- A wishlist and favorites for what’s next.
CommunityAvailable now
Discover people and books.
Follow authors, browse book partners, open a profile and chat directly about a book. For now it’s about discovery — browse, follow and talk.
- Discover and follow the authors you like.
- Browse partner storefronts and reader profiles.
- Chat directly about a book.
Audiobooks, tooListen with background playback and adjustable speed — a quiet companion to reading.
Our promise
Free, private, and built for people.
SecondBook is free to use — and designed to stay that way. No games with your wallet, no ads for your attention, and real care for your data.
Free — no paywall
The core app is free. No subscriptions and no paywall — not now, and not planned.
No ads, ever
We don’t sell your attention. No ads, no ad trackers, no dark patterns.
Your data is yours
Strong privacy and security. Local-first storage, and we never hold your money.
For people, not metrics
Built to be genuinely useful — not to farm engagement or upsell you.
RoadmapWhere it’s going
The book economy, next.
SecondBook’s bigger vision is a full life for every book. The groundwork is built and in testing — we’re opening it step by step, in the open.
A marketplace for physical books
Sell, buy, exchange or gift a book — give a paper book a second reader.
Author self-publishing
Writers publishing and reaching readers directly.
Partner storefronts
Partners running a mobile storefront inside SecondBook.
Trust & moderation
A safety layer for deals, listings and the community.
Engineering
Built by a human who is accountable for every decision.
SecondBook is not written by bots. One founder — with reliability-engineering discipline — is at the center, owns every decision and answers for it. AI is used the way a good engineer uses power tools: to execute and accelerate the work, never to author it or make the call.
AI is not the final judge — it analyses, proposes and accelerates. A human makes the final decision and is accountable for it.
Guardrails in the pipeline
- Release gates
- Route & contract checks
- Feature-matrix checks
- Secret scans
- Feature flags & runtime modes
- Device-proof discipline
Discipline
We don’t call it done until it’s proven on a real device.
Nothing ships as “done” on a claim alone. We hardened the core reading and library flow through real-device debugging, and every error leaves a trace.
- Go / no-go release gates before every build.
- One source of truth for every fact.
- Controlled fallback instead of dead ends.
- No false or misleading UI states.
- Every error leaves a trace we can follow.
The problem
Your books live everywhere except one place.
Files sit in chats, clouds and download folders. Progress resets when you switch phones. You can’t tell what’s really on your device versus in the cloud. And the paper books on your shelf just gather dust.
Book files scattered across chats, clouds and folders.
Reading progress lost the moment you switch devices.
No clear line between what’s downloaded and what’s only in the cloud.
Moving to a new phone means setting everything up again.
Physical books sit unused, with no way to pass them on.
The idea
One entity: the book.
Everything in SecondBook orbits a single thing — a book. Reading, your library, sync, value and discovery are all built around it. Trading is the next orbit.
A book
Read
Library
Sync
Value
Discover
Trade
Beta
What happens next.
No fake store buttons. Just three honest steps.
- 1JoinSend one email and tell us you want in.
- 2We reach outWe’ll email you when a beta slot opens.
- 3Early accessYou get an early build and a direct line to the founder.
Beta
Want to test SecondBook?
Join the beta list or contact the founder directly.
Join the beta
Get on the beta list.
Tell us who you are and how you’d like to test. We’ll email you an invite when a slot opens.