Cobalt+JPNIBM Plex Mono + M PLUS 1
Japanese terminal font

IBM Plex Mono + M PLUS 1, composed for Japanese terminals, editors, and code. The same builder produces 1:2 and 3:5 profiles, seven weights, and real Nerd Fonts variants.

Try the font Build your own
Latest Release v1.1.0 Repository

01 / interact

Try the font

Edit the specimen, change the family and weight, and see the actual generated webfont respond. Your text never leaves the browser.

Preview controls

Cobalt+JPNCobalt+JPN 35Cobalt+JPN NFCobalt+JPN 35 NF
ThinExtraLightLightRegularMediumSemiBoldBold
32px
1.50
Preview preset
Japanese / Iroha poemJapanese / Aozora Bunko / 吾輩は猫であるJapanese / Contemporary mixEnglish / Lazy dog pangramEnglish / UDHR / Article 1English / GPL / permissionCode / cobalt_jpn.pyCode / .github/workflows/build.ymlCode / .github/workflows/release.ymlCode / .github/workflows/pages.ymlCode / SOURCES.lockCode / LICENSECode / FONT-LICENSE.txtCode / NOTICE.md

Choose a preset, then edit the specimen directly.

Reset preview
editable previewIroha poemCobalt+JPNRegular
いろはにほへと ちりぬるを わかよたれそ つねならむ うゐのおくやま けふこえて あさきゆめみし ゑひもせす 京
Type here — family and weight update without a page reload.

02 / measure

Two ways to occupy a cell

The same source logic makes two deliberate width profiles. Compare the Japanese fullwidth glyphs with Latin halfwidth glyphs in the same sample.

Cobalt+JPN

Terminal-first, fixed-pitch profile

1:2
528/1056units1:2
|あああ|
|aaaaaa|
528 / 1056 = 1:2 — three Japanese cells align with six Latin cells.

Cobalt+JPN 35

More room for Latin and code

3:5
600/1000units3:5
|あああ|
|aaaaaa|
600 / 1000 = 3:5 — a wider Latin rhythm with the same Japanese source.

03 / weight

Seven weights, one voice

Every family is built across the complete Thin → Bold range.

Thin日本語 Terminal / Cobalt+JPN 0123456789100
ExtraLight日本語 Terminal / Cobalt+JPN 0123456789200
Light日本語 Terminal / Cobalt+JPN 0123456789300
Regular日本語 Terminal / Cobalt+JPN 0123456789400
Medium日本語 Terminal / Cobalt+JPN 0123456789500
SemiBold日本語 Terminal / Cobalt+JPN 0123456789600
Bold日本語 Terminal / Cobalt+JPN 0123456789700

07 / inspect

Source / Build

These panels are generated from this checkout and a separate GitHub API snapshot at build time. The site commit is deliberately shown apart from GitHub's latest state.

Site commit

checkout9692993b3b69

main / checkout used to render this page

9692993b3b692a8f89191de376bd3ecf9de1dce6

GitHub latest Release

latest releasev1.1.0

Cobalt+JPN-v1.1.0.zip / Sep 5, 2026

latest GitHub Release used for the webfonts

Recent GitHub commit

API snapshot9692993b3b69

[CODEX] ci: deploy Pages on web changes

Codex / Sep 6, 2026

Site commit = the checked-out source used for this build. GitHub Release, commit, and workflow values = independently fetched latest state; they may intentionally differ. A stale snapshot is labeled with its fetch time. “Not refreshed” describes this build's API result, not GitHub as a whole.