Harper: product feeds that simply run.
After more than a hundred account audits one thing was clear: most Shopping problems start in the feed. Disapproved products, wrong categories, stale prices. So we built Harper, a product feed tool we can recommend to merchants without caveats.
Why a Google Ads agency builds a feed tool
Performance Max, Shopping campaigns, Merchant Center diagnostics: everything depends on feed quality. In our audits we keep seeing the same mistakes: missing GTINs, categories that do not fit, prices that differ from the landing page, feeds that run once a day while the shop changes every hour.
The existing tools were either Shopify apps without rules and checks, or enterprise solutions with onboarding projects and module-based pricing. We wanted something in between: self-service setup in under an hour, rules everyone on the team understands, a check of every product before it goes out, and data hosted in the EU.
Harper is exactly that. We use it with our own clients and offer it to merchants and agencies as a standalone product.
What Harper does
Import from Shopify or any feed URL
Shopify via app approval, nothing installed in the store. Or CSV, XML and JSON from any URL: WooCommerce, Shopware, JTL, Magento.
Rules and master rules
If/then rules for titles, prices, labels and exclusions. Master rules apply to every channel, feed rules to one.
Google categories and custom fields
Product type to Google category in seconds; custom labels from margin, season or units sold in the last 30 days.
Checked before every delivery
Required fields, lengths, URLs and categories against each channel's specification. Per-product hints before Google reports them.
Seven channels from one source
Google Shopping, Meta, Microsoft, Pinterest, TikTok, idealo and billiger.de, each in its own format and on its own schedule from 15 minutes.
EU hosting, DPA included
Data in Frankfurt and Amsterdam, data processing agreement part of the terms. Priced by catalogue size from €29 net per month.
Contact
Give us 30 minutes inside your account.
No pitch deck, no five-meeting sales process. We look at your campaign structure and tell you where we see margin on the table. If it fits, we talk about working together.
- An honest assessment within 24 hours
- No sales pitch, no slide deck
- Account, data and documentation stay with you
What happens after you send it
- 1We get back to you within 24 hours.
- 2You give us read access to Google Ads and Merchant Center. Read only, nothing changed.
- 3Within five working days you get the audit in writing: the three biggest levers, what they can bring per month and a clear answer on whether a rebuild is worth it.
- 4The document is yours, even if you implement it without us. If you want, we walk through it together in 30 minutes.
No obligation · Confidential · Reply within 24 hours