What's new in SuperMemo 18?

Learning

• Algorithm SM-18 with a new approach to determining item difficulty
• new universal algorithm metric
• collecting and displaying stabilization curves that determine the efficency of review
• collecting and displaying retrievability-based forgetting curves to determine the efficiency of the algorithm
• simplified editing of repetition histories (e.g. Aug 15, 1995 or Int=6 are allowed instead of full repetition data)
• recalibrating SuperMemo Algorithm to rely on E(SInc[]) rather than SInc[]
• maximum interval increased to 120 years (previously 10,000 days, i.e. 37 years)
• repetition history can be used to override learning parameters
• Undo Repetition (items are made pending when the last record is deleted)
• grade undo is possible by editing the last repetition history record (or using Undo Repetition)

Interface

• 40 predefined themes (skins)(see video)
• each collection can use its own theme (skin)
• all toolbars available as tabs at the bottom of the element window
• emojis used for grades instead of grade names (names known from previous SuperMemos can be restored via Options)

  Error creating thumbnail: Unable to save thumbnail to destination

  Figure: In SuperMemo 18, grades are illustrated with vivid emojis by default. If you prefer the old text-based grades (i.e. Great, Pass, Bad, etc.), uncheck Grade icons in Toolkit : Options : SuperMemo.

Performance

• SuperMemo 18 has been recompiled with Delphi 10.2 Tokyo
• minimizing add on units to capitalize on native Delphi support
• resetting statistics at Memorized=0 does not reset the collection, only deletes files

Bugs fixed

• https:// image import could fail if https files allowed of no http access
• occasionally, RTF files would fail to upgrade to HTML (old format would be retained)
• Alarm : Start could instantly raise the alarm for time>0

Warnings

• No more floating toolbars
• No more toolbar dock
• No more translation import and export via text
• Window:Select:Next window removed
• No more stray repetition export from repetition history
• Additional repetition history warnings Wrong repetition, grade and lapses match can only be fixed manually (e.g. Fix and Edit)

Other

• extended Q&A text import (incl. Anki cloze)
• simplified code with a great deal of refactoring
• 440 improvements and bug fixes

Video

Exemplary skin types (themes) used in SuperMemo 18 (Window : Themes):