Compiled from 3 sources; we haven't tested this product ourselves yet. How we research
Quick answer
The MATOKA COTOMO Log Notebook is an undated, saddle-stitched, 125 × 180 mm notebook with 64 pages from EL COMMUN, made in Japan. The Monthly version has 12 months plus 5 mm grid pages, and the Weekly version has 27 weeks (about six months) plus grid. It lists at ¥550 (about US$3.50).
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Notes on these facts
Made by EL COMMUN. Made in Japan: EL COMMUN's product page gives Japan as the country of origin (the Japanese page's origin field). Source. Price: example listing.
Colors: names per EL COMMUN online shop (Japanese): COTOMO Log Notebook, the per-color product photos, checked November 4, 2026. The names are the maker's variant names; the format is part of each name. The tints are sampled by eye from the maker's per-color photos and are representative. Tints are representative, not measured. Shops stock different colors.
Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43 = CZK 21.7; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).
Key takeaways
The maker lists 12.5 × 18 × 0.5 cm (125 × 180 × 5 mm) and 64 pages with a saddle-stitched binding, made in Japan.
The Monthly version holds 12 months and the Weekly version holds 27 weeks, about six months, each plus 5 mm grid pages.
Both are undated, so you can start in any month; the maker describes the notebook as something between a planner and a diary.
EL COMMUN's shop lists six colors: Monthly peach, mist blue and dark green, and Weekly grege, pistachio and cobalt blue.
The maker's price is ¥550 (about US$3.50) including tax; a US store listed a monthly cover at US$8.00 on November 4, 2026, in our $$ band.
What is the MATOKA COTOMO Log Notebook?
It is a small undated planner-diary, sold in a Monthly and a Weekly version. EL COMMUN, a Japanese stationery company, sells it under its MATOKA brand as part of the COTOMO series. The maker says it keeps the design and size of the plain COTOMO Notebook but adds printed monthly or weekly pages, for a notebook that feels like something between a planner and a diary. We read EL COMMUN’s online shop on November 4, 2026.
What are the size and pages?
125 × 180 mm, 64 pages, saddle-stitched, in two versions. These figures are from the maker’s spec list.
Spec
Monthly
Weekly
Size
12.5 × 18 × 0.5 cm (125 × 180 × 5 mm)
Same
Pages
64
64
Layout
12 months plus 5 mm grid
27 weeks (about 6 months) plus 5 mm grid
Dates
Undated
Undated
Binding
Saddle-stitched
Saddle-stitched
Colors
Peach, mist blue, dark green
Grege, pistachio, cobalt blue
Made in
Japan
Japan
Price
¥550 (about US$3.50) including tax
Same
The maker gives no weight or paper type. Our notebook sizes chart lists other planners and notebooks of this size.
How long does each version last?
Monthly covers a year; Weekly covers about half of one. Because neither is dated, you can start in any month, and a Weekly notebook that runs out after 27 weeks can be followed by another. The drawing puts both on one time scale.
Monthly has a month-at-a-glance layout and Weekly has a box for each day, both with grid space. The maker’s sample images show a monthly spread with a wish list and to-do list beside the weekdays, and a weekly spread with day boxes over 5 mm grid, small weather icons and a scale for how you felt. Both formats also include plain 5 mm grid pages for notes. The maker states the page counts but we can’t see every page, so the exact layout is for you to check on its images.
How do you use an undated notebook like this?
You write the dates yourself, so the notebook starts when you do. On a Monthly page you fill in the month and the day numbers; on a Weekly page you fill in the week. That suits a notebook you pick up part-way through a year, or one that you want to run as a habit log, a reading log or a small work diary rather than a full agenda. The maker’s sample images show handwritten entries, wish lists and to-do lists beside the calendar.
Because the size matches the plain COTOMO Notebook, you can keep a Weekly book and a Grid or Line book in the same cover. The maker says to carry its notebooks with a cover or pouch, but its Pocket Cover page names only the COTOMO notebook, so check the fit before you buy several.
What colors does it come in?
Six: three Monthly and three Weekly. The maker’s variant names are Monthly peach, Monthly mist blue, Monthly dark green, Weekly grege (a gray-violet), Weekly pistachio and Weekly cobalt blue. The foil on each cover spells the version name. The tints in the colors list are our reading of the maker’s photos.
Who is the Log Notebook for?
It suits people who want a small undated planner for monthly or weekly entries and notes. The maker built it for logging daily events somewhere between a planner and a diary.
Journaling and planning: undated pages, 12 months or 27 weeks, plus 5 mm grid pages.
Skip it if you want dated pages or a full year of weekly spreads: the Weekly version covers 27 weeks, about six months.
Where is it made, and what does it cost?
In Japan, and ¥550 (about US$3.50) including tax at the maker, in our $$ band ($5–20) in the US. EL COMMUN’s shop lists ¥550 (about US$3.50) for all six colors. A US store, Five Nine, listed a Monthly cover at US$8.00 on November 4, 2026. For a cover that carries it, see the Pocket Cover.
Frequently asked questions
How big is the COTOMO Log Notebook?
The maker lists 12.5 cm wide, 18 cm tall and 0.5 cm thick (125 × 180 × 5 mm, about 4.9 × 7.1 × 0.2 in), with 64 pages.
Is it dated?
No. The maker calls the Monthly and Weekly pages undated, so you write the dates yourself and can start in any month.
How many months or weeks does each version hold?
Monthly has 12 months of pages and Weekly has 27 weeks, which is about six months. Both also include 5 mm grid pages.
What is the difference from the plain COTOMO Notebook?
The plain notebook has Grid, Line or To Do pages. The Log Notebook swaps them for printed monthly or weekly layouts, in the same size and with the same 64 pages.
What is printed on the monthly and weekly pages?
The maker's sample images show a month-at-a-glance layout for Monthly and day boxes over grid for Weekly, with small weather icons and a feeling scale. We haven't held one, so check the shop images.
Does it fit a COTOMO cover?
Its size is the same as the COTOMO Notebook, 125 × 180 mm, so it should fit the covers built for that book. The maker's Pocket Cover page names only the COTOMO notebook, so confirm with the shop.
Where is it made?
In Japan, according to EL COMMUN's product page. EL COMMUN is a Japanese company and MATOKA is one of its brands.
