| Core Identity |
| Developer | Allen Eubank | INTSIG Information Co., Ltd | Readdle Technologies Limited | Notion Labs, Incorporated | Ginger Labs | InnerGrow |
| Category | Productivity | Productivity | Productivity | Productivity | Productivity | Productivity |
| Platform | iOS, Android | iOS | Android, iOS | Android, iOS | Android, iOS | iOS, Android |
| Store Metrics |
| Rating | 4.6 / 5 | 4.9 / 5 | 4.8 / 5 | 4.8 / 5 | 4.8 / 5 | 4.8 / 5 |
| Ratings Count | 89 | 1,790,119 | 614,518 | 82,804 | 446,840 | 139,175 |
| Price | USD59.99 | Free | Free | Free | Free | Free |
| Release Date | Nov 7, 2020 | Aug 28, 2010 | Apr 1, 2010 | Sep 14, 2017 | Apr 1, 2010 | Jan 31, 2019 |
| Last Updated | Oct 1, 2025 | Apr 10, 2026 | Apr 14, 2026 | May 5, 2026 | May 4, 2026 | Apr 14, 2026 |
| Sentiment & Reviews |
| Sentiment | positive | mixed | positive | negative | negative | - |
| Score | 85/100 | 45/100 | 78/100 | 35/100 | 25/100 | - |
| Praises | | | - Ease of Use and Interface
- Cross-Platform/Device Utility
| - Relational database structure provides powerful organization for personal and professional knowledge management
| - AI-powered quiz generation provides efficient study tools for complex academic material
| - |
| Complaints | | - Aggressive Monetization
- Data Loss & Support
| - Aggressive Monetization
- Performance and Stability Issues
| - Frequent app crashes and UI freezing during text editing sessions on mobile devices
| - Persistent note retrieval and synchronization failures render critical academic data inaccessible
| - |
| Requests | | - | - | - Toggle switch to disable or hide AI features from the primary interface
| - Hands-free Siri integration for verbal interaction with AI-generated study content
| - |
| Strategic Intel |
| Strengths | - Offline-first architecture ensures consistent usage in restricted school networks
- HIPAA-compliant data storage creates a high barrier to entry for generalist tools
| - Massive 300M+ user base
- 41-language OCR support
- Advanced multi-format conversion (Excel, Word, PPT)
| - Modern and intuitive UI/UX compared to legacy competitors
- Advanced AI integration (transcription, smart eraser)
- Massive social proof with 2.2M+ ratings
| - Relational database engine enables complex knowledge management systems
- Template library lowers barrier to entry for new users
| - Audio-to-ink sync creates high switching costs
- Multi-format annotation supports complex workflows
| - |
| Weaknesses | - One-time $59.99 purchase model limits recurring revenue for R&D
- Lack of cross-platform cloud synchronization creates data-management friction
| - Aggressive paywalling of legacy free features
- Mandatory watermarks on free tier
- Reports of data loss and poor support responsiveness
| - User friction from aggressive subscription paywalls
- Performance regressions (crashing, overheating) in recent updates
- Lack of granular network protocol depth compared to GoodReader
| - Mobile app crashes during long editing sessions
- Forced AI elements disrupt core UI
| - Persistent sync failures during study periods
- Intrusive subscription prompts alienate users
| - |
| Pricing | paid | subscription | freemium | freemium | freemium | free |
| Momentum | Maintenance | Active | Active | Active | Intense | Intense |
| Update Cadence | 5 versions | 5 versions, 1 majors/6mo, ~6d avg | 5 versions, 1 majors/6mo, ~7d avg | 5 versions, ~5d avg | 5 versions, 4 majors/6mo, ~7d avg | 5 versions |
