TLDR - It has the raw data

Other stat apps simply collect data such as how many characters you read and when.

They normally collect data like:

• When you started reading
• When you stopped
• How much you read

This allows them to calculate stats like:

• Characters / hour
• Characters read
• Hours / day

etc

GSM collects the actual sentences you read. You don't tell GSM anything, GSM stores the actual sentences.

Specifically this data is stored:

• The time the sentence came in
• What the sentence was
• Whether it was mined to Anki or not
• What game the sentence is from

This allows GSM to calculate all the same stats as before, but we can get some extra data like:

• The words or Kanji in that sentence
• Charcters / hour per game

etc

More importantly many statistic apps use an AFK timer to work out when you're AFK.

If you don't read for say 30 seconds, it considers you AFK.

Because they do not have the raw data, they calculate it once and that's it for life.

In GSM because we have the raw data, you can change your opinion about this anytime.

• Want a shorter AFK time?
• Want to remove English words from the sentences you read?

Conclusion

Other stat apps -> One time statistics, usually without the raw data, which cannot be changed and are inflexible

GSM Stats -> Has raw data, allows you to change your opinion whenever you want about your data