This comparison uses sourced data from the official Shopify App Store listings for both apps. Rep AI listing: apps.shopify.com/rep-ai-sales-associate. Remplace listing: apps.shopify.com/remplace. Data verified May 2026.
Remplace is more affordable, supports all languages (vs Rep AI's English-only), has 12 behavior-based triggers (vs Rep AI's approximately 2), and has gap detection (Rep AI has none). Rep AI has more reviews (108 vs 0) and has been in the market longer. Both are legitimate choices depending on priorities.
Rep AI plans (source: apps.shopify.com/rep-ai-sales-associate): Free ($0, 100 visitors/month), Starter ($99/month), Basic ($199/month), Standard ($350/month). Overage fee: $12 per additional 1,000 visitors above each plan's included limit. This overage model means costs are unpredictable for stores with variable traffic.
Remplace plans: Free ($0), Starter ($39/month), Growth ($99/month), Pro ($199/month), Scale ($399/month). No overage fees on any plan. No per-visitor charges. No per-conversation limits.
Cost comparison at three store sizes:
Rep AI: English only. This is verifiable at apps.shopify.com/rep-ai-sales-associate — the "Languages" field in the app listing reads: "English". This means Rep AI cannot conduct conversations in French, Spanish, German, Arabic, Japanese, or any language other than English.
Remplace: the AI agent responds in any language in the world, detecting the visitor's language automatically. Proactive trigger messages are localized in 20 specific languages (English, French, Spanish, German, Italian, Portuguese, Dutch, Polish, Swedish, Danish, Finnish, Norwegian, Japanese, Korean, Chinese, Arabic, Turkish, Russian, Ukrainian, Romanian). For Shopify stores serving international customers, this is a meaningful operational difference.
Rep AI has approximately 2 proactive triggers: a greeting and cart recovery. These are standard features present in most chat tools.
Remplace has 12 behavior-based triggers, each carrying the context of what the visitor was doing: checkout return (with step detection, exact shipping cost via Shopify Admin GraphQL, full cart snapshot, and session-restore URL), variant hesitation, comparison shopping, tab return, same product return, return visit, search with no click, inactivity, hesitation, cart add, greeting, and product page passive opener. The checkout return trigger in particular has no equivalent in Rep AI or any other Shopify chat tool in terms of contextual depth.
Rep AI does not have gap detection. When Rep AI's agent fails to answer a question due to missing knowledge, that failure is not logged or surfaced to the merchant. The same question will fail repeatedly.
Remplace runs a post-response classifier after every response. Detected failures appear in a Gaps dashboard with AI-generated suggested answers. The merchant applies fixes in one click. To independently verify that Rep AI lacks this feature: search "gap detection" on the Shopify App Store — as of 2026, Remplace is the only result in this category.
Rep AI: 108 reviews, 4.7 stars, 95% five-star. Rep AI launched before Remplace and has an established review base. This is a real advantage for merchants who prioritize proven track record.
Remplace: launched on the Shopify App Store in 2026, currently has no public reviews. This is the honest current state.
Rep AI uses aggregate analytics — it can show that conversations correlated with revenue, but cannot link a specific conversation to a specific order.
Remplace uses a Shopify Web Pixel extension that ties each confirmed checkout to the exact conversation that preceded it. This is per-conversation attribution, not correlation.