Still manually listing on Mercari, Yahoo! Auctions, and Rakuma?
5 marketplaces, 1 dashboard.
Take a photo, and AI generates optimized listing copy for each platform. Inventory auto-locks to prevent double-selling. Free for up to 5 items.
Supports all major Japanese C2C platforms
Sound familiar?
30 minutes per listing, every time
Rewriting the same item description for Mercari, Yahoo! Auctions, and Rakuma — three platforms, three separate listings.
AI generates optimized copy for each platform simultaneously. 30 minutes per item down to 3.
Double-sold and got a bad review
Same item sold on Mercari and Rakuma at the same time. Had to cancel one and took a rating hit.
Inventory locks the moment you list. Sold on one channel? Others get automatic takedown alerts.
Fees ate all the profit
Mercari takes 10%, Rakuma 4.5–10%, plus shipping and packaging… how much is actually left?
Auto-calculates real profit per channel including all fees. See instantly where listing pays the most.
List in 3 steps
From registration to listing — streamlined
Upload photos & register
Just upload a photo. AI automatically extracts and organizes product information.
AI generates listing copy
Optimized copy for each channel, auto-generated. Character limits and category templates handled automatically.
List whenever you're ready
Browser extension fills listing forms with one click. Inventory auto-locks — no double-selling worries.
Built for sellers
AI listing copy generation
From one photo, generate listing copy for Mercari, Yahoo! Auctions, and Rakuma simultaneously. Character limits, prohibited words, and category templates applied automatically.
Inventory lock & double-sell prevention
Status changes to "reserved" the moment you list. When sold on one channel, takedown tasks are auto-created for others. Compliant with Yahoo! Flea Market's duplicate listing rules.
Cross-channel profit calculation
Mercari's 10% fee, Rakuma's 4.5–10%, shipping, packaging… compare real profit across channels at a glance. Know where listing pays the most.
Browser extension auto-fill
One click fills marketplace listing forms with data from hakonote. No more copy-pasting between tabs.
A tool that knows every platform's rules
hakonote is built with each platform's latest guidelines baked in. The system blocks risky actions automatically. Account safety comes first.
Simple pricing
AI features and all 5 channels included in every plan.
Pro
For serious sellers
- 100 items
- AI copy 100x/mo
- AI chat 200x/mo
- All 5 channels
- 2 GB storage
- Unlimited auto-fill
Business
For teams
- Unlimited items
- AI copy 500x/mo
- AI chat 2,000x/mo
- All 5 channels
- 20 GB storage
- Up to 5 users
- Unlimited auto-fill
Pro plan includes 1 month free. Start immediately with credit card registration.
Why I built hakonote
I'm a flea market seller myself. I listed on Mercari, Yahoo! Auctions, and Rakuma simultaneously, managing inventory with spreadsheets. I double-sold and had to cancel 3 times. Lost count of how many times reused copy tanked my search rankings. I wanted a proper inventory tool — but Japanese C2C tools either had 2005-era UIs or were built for English-speaking markets. So I built my own.
Frequently asked questions
Do I need to share my marketplace passwords?
No. hakonote never asks for marketplace passwords. The browser extension runs locally in your browser and only fills listing forms with data. No account credentials are sent to hakonote servers.
Won't cross-listing violate platform rules?
hakonote uses a "migration-style" approach, not simultaneous duplicate listing. Inventory is locked when listed, and when sold on one channel, others receive takedown notifications. Designed to comply with Yahoo! Flea Market and Yahoo! Auctions duplicate listing rules.
What are the free plan limits?
The free plan supports up to 5 items. AI copy generation is limited to 5 times/month and AI chat to 10 times/month. All 5 channels are available, and core features are completely free.
Can I export my data?
Yes. Pro and Business plans support CSV export of item data and sales history. Your listing data always belongs to you.
Does it support Mercari Shops?
Currently supports Mercari (C2C). Mercari Shops support is on the development roadmap and will be added in a future update.
Which browsers are supported?
The browser extension supports Google Chrome (desktop). The web app itself works on all major browsers including Chrome, Safari, Firefox, and Edge.