'Optimal trigram' computer keyboard layout

Canonical nameoptimal-trigram.en.ansi
LanguageEnglish
Form factorSlab : ANSI
'Author'Steven Tammen
Author data may not be correct, we're working on it.
Keys horizontally staggeredYes
Letters on thumb (lower and upper case)0
Uses AltGr for standard charactersNo
Moves non-character keys (ANSI/ISO)No
Changes QWERTY 'shift' pairsYes
Changes top row (ANSI/ISO)Yes
Uppercase on different keyNo
Conventional home keys, fingering, Space, Enter, Shifts, AltGrYes
Maintains QWERTY zxcvNo

Click image for larger view

optimal-trigram.en.ansi


Download the Keyboard Layout Analyzer .json file.

Changes from QWERTY (1873)

optimal-trigram.en.ansi

Changes from Modified Blickensderfer (1892 / 2012)

optimal-trigram.en.ansi

Changes from Dvorak (1936)

optimal-trigram.en.ansi

Changes from Colemak (2006)

optimal-trigram.en.ansi

Changes from MTGAP (2012)

optimal-trigram.en.ansi

Changes from HIEAMTSRN (2014)

optimal-trigram.en.ansi

Similarity

AncestorScore
QWERTY (1873)
Modified Blickensderfer (1892 / 2012)
Dvorak (1936)
Colemak (2006)
MTGAP (2012)
HIEAMTSRN (2014)
Maximum

Scores

Scores are percentages relative to the best layout for each metric.
MetricPercentage
Finger-based metrics68.01
Word-based metrics83.06
English70.92
Code57.23
Proglish67.11
Words metric for words on home keys69.57
Words metric for no same-finger96.55
Overall score75.54

All layouts (355)

MetricLowestLowest scoreoptimal-trigram.en.ansi scoreHighestHighest score
Fingersyang-mali.en.ansi38.5668.01
chia.en.matrix99.25
Wordsyang-mali.en.ansi7.4583.06
chia-vanilla.en.matrix99.45
Averageyang-mali.en.ansi23.0175.54
chia.en.matrix99.35

All ANSI (274)

MetricLowestLowest scoreoptimal-trigram.en.ansi scoreHighestHighest score
Fingersyang-mali.en.ansi38.5668.01
uciea-minimo3.en.ansi78.86
Wordsyang-mali.en.ansi7.4583.06
optimal-trigram.en.ansi83.06
Averageyang-mali.en.ansi23.0175.54
uciea-minimo3.en.ansi79.46

Conventional ANSI (215)

MetricLowestLowest scoreoptimal-trigram.en.ansi scoreHighestHighest score
Fingersyang-mali.en.ansi38.5668.01
uciea-keyboard.en.ansi73.09
Wordsyang-mali.en.ansi7.4583.06
optimal-trigram.en.ansi83.06
Averageyang-mali.en.ansi23.0175.54
uciea-keyboard.en.ansi77.43

Comparison to other layouts

optimal-trigram.en.ansi optimal-trigram.en.ansi

colemak.en.ansi

mtgap.en.ansi

workman.en.ansi

dvorak.en.ansi

norman.en.ansi

qwerty.en.ansi

Best ANSI

uciea-minimo3.en.ansi

optimal-trigram.en.ansi

Worst ANSI

yang-mali.en.ansi

Finger based metrics

Finger based metrics, as determined with Keyboard Layout Analyzer, using KLAnext scoring model.
QwertEff is the QWERTY Efficiency, i.e. the Score relative to qwerty.en.ansi at 100%.
Lower is better, except for QwertEff.

English

RankLayoutScoreDistanceFingerUsageSameFingerSameHandQwertEff
Bestchia.en.matrix95.9336.9931.7420.386.83184.23
This layoutoptimal-trigram.en.ansi135.2660.2740.0428.016.94130.66
Referenceqwerty.en.ansi176.7380.4237.5750.728.02100.00

Programming code

RankLayoutScoreDistanceFingerUsageSameFingerSameHandQwertEff
Bestx1_atreus-44-keys.en.ergodox159.6942.9935.9670.4710.25185.56
This layoutoptimal-trigram.en.ansi279.02108.9745.27113.8810.89106.20
Referenceqwerty.en.ansi296.32124.4144.22115.0012.68100.00

Proglish (an 80:20 English:Code mix)

RankLayoutScoreDistanceFingerUsageSameFingerSameHandQwertEff
Bestchia.en.matrix110.0738.9932.0131.487.58182.28
This layoutoptimal-trigram.en.ansi164.0170.0041.0845.277.66122.33
Referenceqwerty.en.ansi200.6489.2238.9063.668.85100.00

Overall Fingers score (4 * English % + Code % + Proglish %) / 6

Higher is better.
RankLayoutPercentage
Bestchia.en.matrix99.25
This layoutoptimal-trigram.en.ansi68.01
Referenceqwerty.en.ansi54.31
MetricLowestLowest scoreoptimal-trigram.en.ansi scoreHighestHighest score
Overall fingersyang-mali.en.ansi38.5668.01
chia.en.matrix99.25

English Word-based analysis

Home Keys Analysis

The Home Keys for this layout are shown with red dots in the first image above, giving the following letters:

adeinrst

Home key common words

Not part of final score.
Which of the 200 most common words are typeable on the home keys.

Words handledWords not handled
and a in is as it i at are an its said did see end set need the of to that was for with on be by his he from had not which have or were this but you their they her has all been one will who would more she up can him so out there into we when them about other than time no if some only also first could two my what over such do may me any like then after very most these new made your people now between should where years many being our before through much way work those well down back just even because own little make must good under man used both same how still three while use last too life against know year each us get mr take long part off go day might great never found old gbp right another place came during again without come world men upon think later say few left number away thought until home here small different system though around since often called within always every went

Home key words

How many of the 30,000 most common words in the English corpus are typeable on the home keys.

Home Key lettersEnglish words typeableScoreLongest wordExample
adeinrst869378813disinterested

Word count
Word length

No same-finger words

How many of the 30,000 most common words in the English corpus can be typed without using the same finger twice.

Home Key lettersEnglish words typeableScoreLongest wordExample
adeinrst2675616323919seventeenth-century

Word count
Word length

Word metric comparisons

MetricLowest exampleLowest scoreoptimal-trigram.en.ansi scoreHighest exampleHighest score
Home keys wordsabcdef.en.ansi153788
chia-vanilla.en.matrix5445
No same-finger wordsyang-mali.en.ansi22591163239
uciea-keyboard.en.ansi169072
Words averageyang-mali.en.ansi7.45 %83.06 %
uhia.en.matrix99.45 %

Typing lessons

Download some English words suitable for learning the layout.
Note if any files are empty it's because there are not enough words to create a lesson. This is most noticeable in the bad layouts.

Week 1Homekey words Day 1 Day 2 Day 3 Day 4 Day 5
Week 2No same-finger words Day 1 Day 2 Day 3 Day 4 Day 5
Week 3Common / tricky words Day 1 Day 2 Day 3 Day 4 Day 5
Week 4Pangrams Day 1 Day 2 Day 3 Day 4 Day 5
Week 5So you think you can type? Day 1 Day 2 Day 3 Day 4 Day 5
Week 6Extra practice 1: Common words in text Day 1 Day 2 Day 3 Day 4 Day 5
Week 7Extra practice 2: Lorem ipsum and friends Day 1 Day 2 Day 3 Day 4 Day 5
Week 8Extra practice 3: Underused words Day 1 Day 2 Day 3 Day 4 Day 5
Week 9Extra practice 4: Commonly misspelled words Day 1 Day 2 Day 3 Day 4 Day 5