How Lume works

In 30 seconds

What's actually happening?

🔍You browse. Lume watches the prices.

When you open a product page, the extension reads the price and stores it. No magic. Most stores already publish price data in standard formats (JSON-LD, Open Graph). Lume just reads what's already there.

Over time, a price history builds up. Next time you see «70% OFF!!!», glance at the chart to realize the «old price» was inflated two days ago. Classic trick. Now you see it.

Works with 650+ stores: Amazon, eBay, Bol.com, Coolblue, Walmart, AliExpress, Rozetka, Foxtrot, Comfy, and basically any store that follows the web standards for product data.

📊A price chart that doesn't lie

Each dot on the chart is a real observation, not an estimate or an average. You see the actual price on a specific day. The chart shows:

• Current price compared to previous ones
• The lowest price across the entire observation period
• Whether the current «discount» is real or staged

No interpretations. Just data. You decide.

🔔The Telegram bot: your personal price watcher

Don't want to check prices manually? OK. That's what the bot is for.

How to add a product:

• Send a product link to @LumepriceBot
• That's it. No forms, no accounts, no email confirmation

What happens next:

• Lume checks the price every few hours automatically
• Price dropped? Instant message
• Item back in stock? You hear about it first
• Target price reached? Notification + the bot clears the target automatically to avoid spam

🛒«Bought it!» and post-purchase monitoring

Tapped «Bought» after placing the order? Lume keeps watching quietly. If the price drops after your purchase, you get a notification. Useful if the store has price-match policies or you're still within the return window.

⏰Snooze and remind

Got a price-drop alert but not ready to buy? Tap «Remind later». In 3 days the bot pings you with the update: the price dropped further, went up, or stayed the same.

🔗Extension + Telegram = full sync

Using both the extension and the bot? Link them. All tracked products sync between both. Delete something in one place, it disappears from the other.

How to link:

1. Open the extension, click «Connect Telegram»
2. A link opens in Telegram
3. Done. Everything syncs automatically

Some stores are tricky (strong anti-bot protection, prices rendered only in the browser). For those products Lume marks them as «Updated from browser». The bot can't check them on its own, but every time you visit the page with the extension active, the price updates and syncs. Best of both worlds.

💰Cross-store price comparison

Tracking a Samsung TV on one site? Lume automatically searches for the same product at other stores and tells you if it's cheaper somewhere. No manual comparison.

Works best for electronics and known brands, where model numbers let us match items reliably.

💸Cashback, automatically

For stores supported by LetyShops cashback, Lume shows the cashback percentage right in your product list. Click «Open» and the affiliate link is applied automatically. You don't need a separate LetyShops extension.

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Under the hood (for the curious)

How often are prices checked?

Not all products are equal. Lume uses a tiered scheduler:

Product type	Check interval	Why
Regular products	Every 1-2 hours	Good balance of freshness and server load
JS-heavy sites (Cloudflare, SPA)	Every 2-4 hours	Requires a headless browser - it's expensive
Out of stock products	Every 24 hours	No rush, but we keep an eye on them
Browser-only products	When you visit the page	Your browser does the work

Smart error handling

Sometimes a store changes layout or goes down. Lume doesn't panic:

• Tiny price wobbles (under 1%): ignored, probably rounding
• Huge price swings (35%+ drops, 3x+ jumps): flagged as suspicious, double-checked before notifying. This catches parser bugs and currency mix-ups so you don't get a fake «price dropped 90%!»
• Temporary errors: retried next cycle. After 3 consecutive failures, the interval bumps to 72 hours
• Stock changes: confirmed across 2 consecutive checks before notifying, so a brief glitch doesn't trigger a false alarm

Three-pass price detection

Lume reads prices using three strategies, in order:

1. JSON-LD / structured data (most reliable): the store explicitly publishes the price for search engines. Lume reads the same data
2. Open Graph meta tags: Facebook-style product metadata. Less common but reliable when present
3. CSS heuristics: for stores that don't follow any standard, Lume looks for common price patterns in the HTML

If the first method succeeds, Lume uses it and moves on. No guessing.

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Privacy

• No account needed. Seriously. The extension generates an anonymous device ID. The bot uses your Telegram ID. That's it.
• No passwords stored
• No cookies tracked
• No ads
• No data sold

Full details: Privacy Policy · Terms of Use

Questions? Something not working? Write to [email protected] or just message the bot. We actually read everything.