Kohomadha Inc. — Tokyo · Updated August 2026

The Stack

Every tool we actually run a cross-border business on. What each one costs, what it replaced, and where it lets us down.

Disclosure. Some links on this page may be affiliate links, meaning we could earn a commission if you sign up through them at no additional cost to you. Nothing here is a paid placement. We only list tools we pay for and use in our own work, and we say plainly where each one fails. If a tool stops being useful, it comes off this page.

We run a company that works in two directions — overseas companies entering Japan, Japanese companies going abroad — from a small team in Tokyo. That means every tool has to work across time zones, in two languages, and be operable by people who are not engineers.

Most "tool stack" pages are written by people who signed up for a free trial. This one is a record of what we pay for every month, and it is updated when something changes rather than when it is convenient.

Building

Making things without engineers

Nobody at this company writes code. Everything below is chosen on one criterion: will it still be running in three weeks without someone technical to fix it.

Claude Code

from $20 / month daily

An AI that works inside your files and terminal rather than in a chat window. We use it to build internal tools, draft and send outbound email, produce documents, and render video. The internal sales tool we run was built with it in an evening.

Replaced
Outsourced development for anything small, and most document production.
Best at
Work where you can describe the outcome but not the implementation.
Fails at
It will confidently say a thing is finished when it is not. Every output has to be checked by a person who cares about the result.

Vercel

free tier / $20 per seat daily

Hosting for our own site and everything published from it, including this page. Push to a repository and it deploys. The free tier is genuinely sufficient for a company site.

Replaced
A managed hosting contract we could not edit ourselves.
Best at
Making publishing a non-event. We ship changes several times a week.
Fails at
Nothing yet, at our scale. Costs scale sharply if traffic does.

HyperFrames

open source new

Renders HTML and CSS animation to MP4. We use it to turn data we already have into short vertical video for social, without opening an editor.

Replaced
Video editing software for anything that is text, data, or motion graphics.
Best at
Repeatable video. Change the numbers, render again.
Fails at
Needs FFmpeg installed, which is a real barrier on a Mac without Homebrew. Not a tool for cutting footage.

n8n

free self-hosted / from €20 daily

Workflow automation you can host yourself. We use it to move data between systems and to run scheduled jobs that would otherwise be someone's Monday morning.

Replaced
Manual copying between tools, and one recurring admin task per week.
Best at
Anything that happens on a schedule and does not need judgement.
Fails at
Self-hosting means you own the uptime. If you will not maintain it, pay for the cloud version.
Working across languages

The part nobody outside Japan budgets for

Cross-border work is mostly a language problem wearing a business costume. These are the tools that carry that weight.

Google Workspace

from $7.20 per user / month daily

Mail, calendar, documents, and video calls. Unremarkable, and that is the point — every counterparty we deal with, in every country, can already open what we send.

Best at
Being the thing everyone else already has. In cross-border work that matters more than features.
Fails at
Deliverability for cold outbound is poor from a free account. If you send business mail, pay for a domain.

Notion

free / from $10 per user daily

Where project material lives so that a member in Brazil and a member in Tokyo are looking at the same page.

Replaced
Documents attached to email threads, which is how information gets lost.
Fails at
Becomes a landfill without discipline. We keep the structure shallow on purpose.
Deliberately absent

What we do not use, and why

A stack page that only lists what someone likes is an advertisement. These are the categories we have tried and left.

A CRM platform

We tried several. Our pipeline currently lives in a plain text file that our own tooling reads and writes. Two hundred prospects is not a CRM problem — it is a discipline problem, and paying for software does not solve discipline.

We will need one eventually. Not yet.

Outbound automation tools

The category that promises to send hundreds of personalised emails per day. We do not use them, and it is a deliberate choice rather than a budget one.

Our reply rate went from 3% to roughly 15% when we stopped selling and started asking a real question in each message — and a real question requires knowing something specific about the company you are writing to. That cannot be templated, which means it cannot be scaled the way those tools promise.

We send ten to fifteen a day, by hand, and each one names something true about that company's situation in Japan.

Anything that routes our data through a proxy we do not control

There is a popular genre of tutorial explaining how to redirect paid AI tools through free third-party providers. We hold client contracts, a signed exclusivity agreement, and a pipeline of named companies. None of that goes through infrastructure we cannot account for, at any saving.

The question is never what a tool can do. It is whether it will still be running in three weeks without someone technical to fix it.