Yasugoro is a price watcher built around the real price — the display price minus the reward points a purchase earns. It compares the same item across marketplaces like Rakuten, Yahoo! and Amazon, and sends a Web Push when a staple you’re watching gets cheaper. No login, used anonymously.
What it does
It saves you from re-running the same mental math every time: “option A has the lower sticker price, but option B returns more points — so which is cheaper?” Yasugoro sorts on the real price, points included, and notifies you only when a watched item genuinely drops.
The “buy now” decision rests on points you’ll definitely receive — the confirmed amount the API returns. The “maybe” portion (entry-required campaigns, your own loyalty multiplier) is shown only as a range of how far the price could fall; it never feeds the trigger. The design leans toward not inflating the number.
Highlights
- Compares on the real price — sorted by display price minus points, not the sticker price, across marketplaces.
- Notifies only on a real drop — no need to watch constantly; a Web Push arrives when a watched staple gets cheaper.
- No login — anonymous, no account, no email address.
- Doesn’t inflate — points split by certainty into three layers, with only the certain part deciding “buy now”.
When to use it
- Staples you restock on a cycle — diapers, detergent, protein, coffee beans: watch the things you rebuy, and a notification arrives when one drops, so you’re less likely to miss the floor.
- When reward points muddy the call — sticker prices are close, but each marketplace returns a different amount. Sort by real price and the cheapest-by-certain-points stands out at a glance.
- When you’re waiting for a sale — without chasing every “5 and 0 day” or campaign, you get pinged on the day a watched item gets cheap once conditions are folded in.
How it differs from doing it by hand
You can work out the point-inclusive cheapest yourself — open each marketplace, note the sticker price, compute the reward rate, check the limited-time-point and entry conditions, and repeat per item, per day.
Yasugoro takes over that repetition. Its real-price math splits points by certainty, so the cheapest never rests on self-reported points you’ve inflated. Unlike a price-comparison site, it leans less on “list the cheapest store right now” and more on “tell me when a watched staple hits a buying moment.”
Before you start
Does it cost anything?
It’s free to use, with no account to create.
Do I need to log in or register an email?
No. Watches and notifications are keyed to an anonymous device token, so there’s no email registration either.
How do notifications arrive?
Through the browser’s Web Push. Allow notifications in a supported browser and you’ll get a push when a watched item hits a buying moment.
Which marketplaces are supported?
It’s built around cross-marketplace comparison for Rakuten, Yahoo!, Amazon and others, with coverage widening over time.
How the real-price math works
Turning “which is cheapest once points are in” into a trustworthy number is harder than it looks: reward-rate units differ, there are caps, limited-time points, shipping, and rounding to settle. I wrote up the three-layer logic that handles it in Computing the real, point-inclusive price. That same calculation runs inside Yasugoro.
Prices, points, and campaign details are estimates based on the data each marketplace provides. Confirm the final amount and eligibility on the marketplace at checkout.