Reviews for up to ten places per call, by Maps URL or place id, with the text, stars, date, reviewer and the owner's response. Four sort orders: newest, most relevant, highest and lowest. You need the place first, so pair it with the Google Maps search, which returns place ids.
Customer reviews for up to ten products by ASIN or product URL, on any of 12 Amazon marketplaces. The verified-purchase and Vine flags, helpful votes and the variant reviewed make it the strongest source for product feedback. Amazon caps reviews at 100 per product, so treat it as a sample, not the full history.
One operation reads reviews for hotels, restaurants and attractions alike, by Tripadvisor URL. Filter by a minimum date, by star values and by review language. You need the place URL first; the three Tripadvisor search operations return it.
Guest reviews for up to ten properties, with what the guest liked and disliked as separate text, the score, traveler type and room. Sort by newest, oldest, relevance or score, stop at a date, or keep only Booking's score bands (superb, good, average, poor). Properties are named by their booking.com/hotel URL.
Reviews for up to ten businesses by yelp.com/biz URL or slug, with reactions, the reviewer's profile and the owner's reply. The business profile operation adds review insights by topic with sentiment and review highlights, which saves reading every review. It only covers businesses that have a Yelp page.
Reviews for up to ten listings by URL or room id, with the host's response. Set a locale and reviews written in other languages come back translated. The review rows are lighter than Booking.com's; per-category ratings sit on the listing card instead.
Reviews and recommendations on up to five pages per call, by page URL or handle. The page card adds the review count and recommend percentage. It takes fewer subjects per call than the other sources here.
Play Store reviews for up to five apps by package id or store URL. Filter by country and language, sort by newest, highest rating or most helpful, and see which app version each review was written on. It is the only app store source on this list.