Decide What You Want to Do
Start with the task. Need editable digital text? Prioritize OCR and computer connectivity. Need reading assistance? Prioritize text-to-speech, display, dictionary functions, and ease of use. Need translation? Look closely at supported languages and whether translation works offline or requires a connection. Need a student tool? Look for vocabulary, definitions, pronunciation, portability, and simple operation. Need professional document capture? Prioritize software, connectivity, compatibility, scan speed, and export options.
Check OCR Languages
A product supporting "many languages" isn't automatically useful for you. Check whether it supports the specific languages and scripts you actually need.
Also distinguish between OCR languages, speech languages, translation languages, and dictionary languages — these are not necessarily the same.
Look at Text-to-Speech
If you're buying a reading pen, text-to-speech may be more important than raw scanning specifications. Check available voices, supported languages, speech clarity, speed controls, whether speech works offline, and whether headphones are supported.
Check Translation
Translation functionality varies significantly. Look for source languages, target languages, offline translation, online translation, translation speed, and whether individual words or complete sentences can be translated.
Consider the Display
Some pen scanners have screens; others rely primarily on a connected computer or mobile device. A built-in display can make the device more independent. If you primarily want to scan text into a computer, the display may be less important.
Check Connectivity and Compatibility
Look for the connection method you actually need — USB, Bluetooth, Wi-Fi, mobile app, or computer software. Don't assume that a product that connects to a computer will work equally well with every operating system.
Before buying, verify compatibility with Windows, macOS, ChromeOS, Android, and iOS/iPadOS specifically. Compatibility should be treated as a product-specific specification, not assumed from the presence of Bluetooth or USB.
Offline Functionality
Offline operation can matter when you're traveling, in a classroom, in a workplace with restricted connectivity, don't want to depend on a phone, or need immediate access to basic functions.
Check which features actually work offline. A device can have offline OCR while requiring an internet connection for translation or advanced services.
Battery
Look at more than battery capacity. Consider typical usage, charging method, charging time, standby time, and whether the battery is replaceable or built in.
Price and Value
The cheapest pen scanner isn't necessarily the best value. Consider the complete package: hardware plus software plus features plus compatibility plus support plus warranty.
A product that costs more but fits your workflow can be better value than a cheaper device you rarely use.