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Readdle

Readdle is a global software company founded in 2007 in , , by Igor Zhadanov, Alex Tyagulsky, Andrian Budantsov, and Dmitry Protserov, specializing in productivity applications primarily for , , and macOS, with also available on . The company develops an ecosystem of interconnected apps designed to streamline workflows, including file management, PDF editing, email, calendars, and document scanning, with over 235 million downloads worldwide. Readdle's origins trace back to the launch of the first , when the founders identified a need for mobile document reading software and released their debut app, ReaddleDocs, in the inaugural in 2008. Over the years, the company expanded its portfolio with key releases such as Scanner Pro in 2009, PDF Expert in 2010, Spark Mail in 2015, and Calendars by Readdle, while iterating through more than 30 products, many of which did not succeed but informed future innovations. By 2023, Readdle had grown to employ over 300 people across 30 countries and eight global hubs, maintaining its research and development base in despite challenges like the 2022 . The company's flagship apps have garnered significant acclaim and adoption: PDF Expert boasts 30 million users for advanced PDF annotation and editing; Spark serves 17.5 million with intelligent email management; Documents has 115 million users for secure file handling and cloud integration; Scanner Pro aids 9 million in digitizing papers with OCR technology; and Calendars supports 30 million in task and event organization. Readdle's products have received prestigious recognitions, including multiple Apple Editors' Choice awards, App Store App of the Year honors, and Red Dot Design Awards for user interface excellence, including one for Documents in 2025. Trusted by enterprises such as Siemens and BMW, Readdle emphasizes high-quality user experiences, customer feedback, and cross-platform accessibility to shape the future of work.

History

Founding

Readdle was established in , , in 2007 by co-founders Alex Tyagulsky, Andrian Budantsov, Igor Zhadanov, and Denys Zhadanov, with Dmitry Protserov joining the team in 2008; Igor Zhadanov served as the company's first CEO. The founders, who were university friends, were inspired by the launch of the first earlier that year, recognizing the device's potential but noting its lack of native support for reading PDFs and e-books. Their initial concept was to develop a simple that would enable users to view and manage documents on the , addressing this gap in functionality for a device that was revolutionizing . The early days were marked by resource constraints typical of a startup in post-Soviet , where the team operated from a small rented apartment in . Comprising just a handful of developers, they coded relentlessly—often working late nights and weekends—without a formal , leading to humorous misconceptions among locals who mistook their irregular hours for suspicious activity. Roles emerged organically: Budantsov and Protserov handled technical development, Tyagulsky focused on design, and the Zhadanov brothers managed organization, finances, and marketing. This lean setup allowed them to prototype quickly, but it also highlighted the challenges of building software in a region with limited access to global tech ecosystems at the time. The , an early precursor to Readdle's full apps, was released in and quickly demonstrated market demand by attracting 60,000 users within its first two months. This rapid adoption validated the founders' vision and positioned Readdle for a seamless transition to native applications following the App Store's debut in 2008.

Early products and milestones

With the opening of the App Store on July 10, 2008, Readdle released its first standalone application, ReaddleDocs, a dedicated PDF and document reader optimized for the , launched among the initial 500 apps available. The app supported viewing of PDFs, e-books in formats like and MOBI, and other documents, overcoming limitations such as restricted file access by integrating a built-in and organizer for seamless . In its inaugural year, Apple recognized Readdle as one of the top ten services, highlighting the app's role in expanding mobile productivity. By 2009 and 2010, Readdle expanded its early portfolio with innovations, including enhancements to ReaddleDocs for better e-book annotations and cross-format compatibility, the launch of Scanner Pro in 2009, PDF Expert in 2010, and Calendars in 2010, solidifying its niche in document handling amid growing adoption. Key milestones during this period included achieving millions of downloads for ReaddleDocs, which evolved into a foundational productivity tool, and the launch of complementary apps like Scanner Pro, marking Readdle's shift toward a suite of interconnected utilities. These developments established Readdle as a pioneer in mobile file management, with the founders' engineering backgrounds enabling rapid adaptation to iOS constraints.

Growth and relocation

Readdle began as a small startup with its initial three-person founding team in , , in 2007, soon expanding to four, focusing on mobile applications shortly after the iPhone's launch. By , the company had scaled to over 300 employees distributed across 30 countries, reflecting sustained organic growth driven by its app portfolio. This expansion accompanied a cumulative total of 235 million downloads worldwide, underscoring Readdle's transition from a niche to a prominent brand. Key growth milestones marked this trajectory, including reaching 100 million downloads by with a team of 135 employees at the time. Continued expansion followed through the development of an interconnected app ecosystem, achieving 200 million downloads by 2022 and growing the workforce to 296 employees across more than 30 locations. In 2024, Readdle discontinued the paid Calendars 5 app to streamline its offerings around the Calendars app. In 2025, Documents received a Red Dot Design Award for its . These achievements highlighted Readdle's bootstrapped model, emphasizing user-centric innovation without external funding. The 2022 profoundly influenced Readdle's operational landscape, yet the company maintained its Ukrainian roots with research and development centered in and . Prioritizing employee safety for its over 200 team members in , Readdle implemented protocols refined during the and ensured service continuity through cloud-hosted infrastructure. Amid these challenges, Readdle established 8 global hubs to support its international presence, enabling resilience while committing to long-term investment in . Strategically, Readdle shifted toward building an interconnected productivity suite, integrating tools for seamless workflows across personal and professional use. This evolution included a focus on business-oriented solutions like Fluix, a no-code platform for automating workflows, which complemented its consumer apps and drove further enterprise adoption.

Company

Leadership and founders

Readdle was co-founded in 2007 by four university friends from , : Igor Zhadanov, Alex Tyagulsky, Andrian Budantsov, and Dmitry Protserov, who brought complementary expertise in , , and to build the company from a small team into a global leader. Igor Zhadanov serves as CEO, overseeing the company's strategic direction, scaling efforts, and global expansion while leveraging his organizational acumen to navigate challenges in the Ukrainian tech ecosystem. With a background rooted in Odessa's vibrant startup scene, Zhadanov has emphasized proactive risk management, notably beginning contingency planning in 2014 amid Russia's annexation of Crimea and unrest in Donbas to safeguard operations against geopolitical instability. Under his leadership, Readdle has adopted a remote-first model to foster flexibility and talent acquisition worldwide, enabling sustained growth despite regional disruptions. Zhadanov has also driven investments in AI integration across the product suite, positioning Readdle to enhance user experiences through features like semantic search and document analysis in apps such as PDF Expert. Alex Tyagulsky, as (CPO), shapes Readdle's design vision and user-centric product strategy, drawing from his role as the primary designer of early apps that defined the company's focus on intuitive mobile productivity tools. His contributions have been pivotal in evolving Readdle's offerings from basic file management to sophisticated ecosystems, informed by his deep ties to Ukraine's innovative tech community. Andrian Budantsov, co-founder and former Chief Technology Officer (CTO until December 2022), led technical development with his strong engineering foundation from the scene, ensuring robust for Readdle's cross-platform applications. Budantsov's expertise supported the company's shift toward AI-enhanced features, maintaining high and standards. Dmitry Protserov, co-founder and current VP of Consumer Apps, contributes as a key engineering leader, focusing on core development and innovation, backed by his technical proficiency honed in Odessa's entrepreneurial environment. His work has underpinned the scalability of Readdle's apps, aligning with broader leadership pushes into AI-driven functionalities. The executive structure remains centered on these co-founders, with no publicly noted external board or advisory influences directing major decisions, allowing for agile, founder-driven governance.

Operations and global presence

Readdle employs over 300 people distributed across more than 30 countries, adopting a remote-first approach that enables flexibility while maintaining connectivity through eight operational hubs in locations including Odesa, Kyiv, Berlin, Gdańsk, Warsaw, Lisbon, and London. This global structure supports seamless collaboration, with the company emphasizing asynchronous communication and tools for remote productivity to accommodate diverse time zones and personal circumstances. The company's centers on -facing applications, utilizing a structure where core features are available for free to drive widespread adoption, supplemented by subscription-based premium upgrades for advanced functionalities such as enhanced PDF editing in PDF Expert or AI-powered email prioritization in . In addition to consumer revenue, Readdle offers solutions like Fluix, a B2B document workflow platform designed for automating field operations and compliance in industries including and energy. This dual approach has facilitated over 235 million app downloads worldwide, establishing a sustainable revenue stream through in-app purchases and subscriptions. Development efforts at Readdle prioritize an iOS-centric ecosystem, with dedicated support for macOS to ensure cross-device compatibility, focusing on user privacy through secure data handling practices that avoid unnecessary . Recent innovations incorporate for tasks like email decluttering in and emphasize seamless cross-app integration, such as drag-and-drop functionality between Documents, PDF Expert, and Scanner Pro to streamline workflows on and . Readdle fosters a culture that prioritizes work-life balance, with employees rating it 3.8 out of 5 and highlighting flexible remote policies that promote autonomy and prevent burnout. The company promotes diversity through equitable pay practices and a multinational team composition, while demonstrating resilience amid global challenges, including the 2022 Russian invasion of Ukraine, by leveraging its remote infrastructure to sustain operations without service disruptions. This adaptability has reinforced a professional environment centered on innovation and employee well-being.

Products

Documents

Documents by Readdle is a free file management application for , initially launched in 2013 as an evolution of the earlier ReaddleDocs app, which supported document viewing on starting from 2008. It enables users to view and perform basic editing on a variety of file formats, including PDFs, documents (such as Word, Excel, and PowerPoint files), media files (audio and video), and archives, making it a versatile tool for handling diverse content on mobile devices. The app's core features include seamless cloud integration with services like and , allowing users to access and sync s across platforms without leaving the app. It also incorporates a built-in for fetching s via its integrated , a player for streaming and organizing audio and video content into playlists, and secure handling options such as a VPN for during transfers. In 2025, Documents received the Red Dot Design Award for excellence in interaction, , and . With 115 million users worldwide, Documents has established itself as a widely adopted solution for mobile management. Over the years, Documents has evolved through regular updates optimized for and macOS, particularly supporting hardware for enhanced compatibility. These updates have introduced features like Night and themes for improved in low-light conditions, along with performance enhancements to ensure smoother file operations and reduced crashes, without undergoing major structural overhauls. Within the Readdle ecosystem, Documents serves as a central for file organization and access, facilitating seamless integration with other apps like PDF Expert for advanced document workflows. This interconnected role allows users to manage files centrally while leveraging specialized tools from Readdle's suite for specific tasks.

PDF Expert

PDF Expert is Readdle's flagship PDF management application, initially launched in 2010 as a dedicated PDF reader for devices, coinciding with the debut of the first . Over the subsequent years, it evolved into a comprehensive PDF editor, with significant enhancements by that introduced advanced editing capabilities across , , and the newly released version, allowing users to modify text, images, and layouts directly within documents. By this point, PDF Expert had transitioned from a viewing tool to a robust suite for professional PDF handling, supporting seamless workflows on Apple platforms. The app has garnered a user base of 30 million worldwide, favored by professionals in fields such as , , and legal services for its reliability and depth. At its core, PDF Expert offers a range of specialized features for PDF manipulation, including annotation tools that enable users to highlight text, add sticky notes, draw shapes, insert stamps, and even record audio comments for interactive markup. Signing functionality supports digital signatures, with options to create and save reusable signatures for quick application to contracts or forms. Form filling is streamlined, allowing editable fields to be completed accurately, while conversion tools facilitate transforming PDFs to and from formats like Word, Excel, PowerPoint, and JPG, preserving layout integrity. Optical character recognition (OCR) converts scanned documents into searchable, editable text, and a dedicated redaction tool permits blacking out or erasing sensitive information such as names, addresses, or financial details to ensure document security. These features are accessible via an intuitive interface optimized for touch and keyboard inputs. The app operates on a model, where basic reading and limited annotations are available for , but a subscription—priced as a one-time purchase or annual plan—unlocks advanced editing, OCR, conversions, and redaction capabilities across all devices. Integration with enables automatic syncing of files and settings between , , and , while compatibility with other Readdle apps like Documents allows for effortless file transfers and shared workflows. PDF Expert also supports third-party cloud services such as and for broader accessibility. Key milestones include the addition of Apple Pencil support in 2016, which enhanced precision for annotations and editing on models, and the introduction of AI-powered features starting in 2023 with PDF Copilot, an AI assistant for generating summaries, quizzes, flashcards, and extracting key information from documents. Frequent updates have continued to refine these tools, such as AI-enhanced scan improvements and academic templates in 2025, ensuring compatibility with the latest Apple hardware and software advancements.

Spark

Spark is an developed by Readdle, first launched on May 29, 2015, for devices including the and , with subsequent availability on , macOS, and (since April 2019). It provides a unified inbox supporting major providers such as , , /Exchange, and , enabling users to manage multiple accounts seamlessly. As of 2025, Spark has attracted 17.5 million users worldwide, particularly among professionals seeking efficient email management. The app's core features emphasize and , including a Smart Inbox that automatically sorts incoming messages into categories like Personal (from known contacts), Notifications (from services), and Newsletters (bulk mail), prioritizing unread and relevant emails to reduce clutter. Team collaboration tools allow users to share inboxes, assign emails to colleagues, add comments, and co-edit drafts in real-time, facilitating group workflows without leaving the app. Additional functionalities include Send Later, which schedules emails for delivery at optimal times even when the device is offline, and search, enabling intuitive queries like "emails from John about project deadline" to filter by content, sender, date, or attachments. In May 2023, Readdle introduced Spark +AI, a premium feature set leveraging to enhance composition and comprehension. This includes AI-powered drafting for generating personalized s or replies based on user prompts, summarization of long threads into concise overviews (with options for short, detailed, or action-oriented formats), and smart reply suggestions tailored to context. Powered by Azure , these tools process data securely in the cloud without storing it for model training beyond a 30-day retention period, prioritizing user through and compliance with GDPR and CCPA. Within Readdle's ecosystem, serves as a central for productivity by integrating built-in views synced with , , and accounts, alongside task creation from emails that can link to third-party apps like Things or , promoting unified management of communications, schedules, and to-dos.

Calendars

by Readdle is a scheduling and productivity application designed for and macOS devices, first released in 2012 as a visual app for and . It quickly gained popularity for its intuitive interface and advanced features tailored to personal and professional . In 2022, the app expanded to macOS, enabling seamless synchronization across Apple ecosystems including , , , and . As of 2025, Calendars has amassed over 30 million users worldwide, serving students, professionals, and families in organizing events and tasks. The app's core features emphasize ease of use and integration with major services. Users can create events and tasks using input, such as typing "Meeting with team at 3 PM tomorrow," which the app parses to schedule automatically, including details like time, date, and recurrence. It supports customizable views including year, month, week, day, and list formats, allowing users to switch perspectives for better planning. Task lists are integrated directly into the , enabling drag-and-drop rescheduling and prioritization alongside events. Reminders can be set with up to five alerts per item, and the app includes weather updates overlaid on daily views to inform scheduling decisions. Calendars excels in cross-platform synchronization without relying solely on iCloud, connecting natively to , , and Apple Calendar for real-time updates across devices and accounts. This allows users to merge multiple calendars into a unified interface, color-code events for quick identification, and share calendars with others via the underlying services. Family sharing is supported through the subscription's Lifetime plan, enabling multiple household members to access premium features under one purchase. Recent updates have enhanced customization, such as Color-Coding for events and compatibility, along with improved sidebar organization for faster navigation.

Scanner Pro

Scanner Pro is a mobile document scanning application developed by Readdle, first released for devices on October 9, 2009. It has garnered over 9 million users worldwide, establishing itself as a leading tool for digitizing physical documents using cameras. The app focuses on transforming paper-based materials into digital formats, emphasizing ease of use for professionals and everyday users alike. At its core, Scanner Pro leverages the device's built-in camera to capture high-quality scans of documents such as receipts, invoices, books, IDs, and agreements. Key features include automatic , which identifies and crops document borders precisely to eliminate manual adjustments, and advanced image processing that removes shadows, corrects geometric distortions, and enhances contrast for professional results. Users can select from color, , or modes to optimize scans based on content type, ensuring clarity and fidelity in reproduction. Scans are exported directly as PDF or JPG files, facilitating seamless sharing or integration into other workflows. The app offers advanced tools to streamline scanning processes, including batch scanning for capturing multiple pages in quick succession without interruption. (OCR) technology extracts editable text from scans in over 25 languages, enabling searchable PDFs and efficient data handling. Additionally, it integrates with popular cloud services like , , and for automatic backups and uploads, allowing users to access digitized documents across devices. In Readdle's ecosystem, Scanner Pro plays a pivotal role by converting paper documents into digital assets ready for further processing in companion apps like or , bridging physical and digital workflows effectively.

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    Connect Scanner to cloud storage | Scanner Pro Knowledge Base
    In this article, you can learn how to connect your cloud storage to Scanner and choose the upload mode.