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Minimum 350 MB of disk space is required for WebSpellChecker installation package including AppServer, Engines, and web components.

Additional space can be required for the following components: 

• Up to 2 MB for all personal user dictionaries in .../UserDictionaries and up to 10 MB for global custom dictionaries in .../CustomDictionaries directory.
• Up to 15 MB for the AppServer log files to be saved in AppServer/Logs directory. Once a log file size reaches 10 MB, a new log file will be created. 
• Web Server logs, for example, access logs of Apache HTTP Server. Such logs can require a significant amount of disk space as it keeps the records of all served requests. It is your responsibility to monitor and control the space consumption by the access logs.
• Up to 90 MB of memory if you decide to enable detailed logging of one of the WebSpellChecker components (namely, for SSRV FastCGI component). Although, this type of logging is turned off by default. 
• Additional space for usage statistics logs if you enable them. For details, refer to the Enabling Collection of Usage Statistics in Logs guide.  

Sometimes you may need to allocate even more space depending on WebSpellChecker Server environment needs, for example, if the number of your language dictionaries includes 100+ languages.

At least 200 MB of memory is required for spell check, grammar check engines, and cache functioning, if you are referring to WebSpellChecker Application Server (AppServer). Also, consider the following RAM requirements:

• 50 MB for spelling check engine including 16 default languages (English language dictionary is actively used).
• 128 MB for English grammar check engine, plus 512 MB if other languages (from the list of default 14 ones) support is enabled. You also need to consider memory usage for grammar check if you are using all default languages where grammar check is supported.
• 10 MB for cache enabled on Server (for 10 000 suggestions). The rough calculation here is 1 misspelling and its suggestions equals 100 bytes. The more misspelling and suggestions to be added to cache the more RAM will be needed.