Updated Oct 2026

B2B software reviews API: G2, Capterra, Gartner Peer Insights, Software Advice and marketplaces

Prisma is a B2B software reviews API: one REST API that reads the reviews of the B2B software vendors you own or manage, from every platform that matters to them, in one JSON shape, with a signed webhook on every new review. Built for SaaS marketing and product teams, app vendors on Shopify, Atlassian and Salesforce, and the tools that aggregate customer feedback.

Get API key

2 locations free. Test keys return sample reviews from every platform. No card, no sales call.

Why B2B software vendors need an API, not six integrations

• G2 has an API for vendors; Capterra, Software Advice and Gartner Peer Insights have none, their reviews live on the product page only.
• Marketplace reviews (Shopify App Store, Atlassian, AppExchange, WordPress.org) have no vendor API either, and each page has its own structure.
• None of them allow a reply by API; the vendor response is written in each portal.
• Reviews arrive on whichever site the customer uses, so product feedback is scattered across seven dashboards.

Prisma measured all of this when it integrated the platforms; the per-platform rules are in the State of Review Platform APIs 2026.

The platforms, and what each one allows

Trustpilot will join as soon as each platform approves Prisma’s access. Everywhere else the review comes with its URL and you answer on the platform.

What teams build with it

1. One feed of every review of your product across G2, Capterra, Gartner and the marketplaces, into your warehouse or feedback tool.
2. A webhook that posts each new review to the product channel with rating, pros and cons, and the reviewer’s role.
3. Quarterly reports by competitor category using the same JSON for every site.

One call, every platform

curl "https://api.prismareviews.com/v1/reviews?platform=g2&has_reply=false&since=2026-10-01" \
  -H "Authorization: Bearer $PRISMA_API_KEY"

Every review comes back with the same fields whatever the platform: id, platform, location_id, rating (always out of 5), title, text, author, language, created_at, reply and url. This call lists the G2 reviews since 1 October that nobody has answered yet; drop the platform filter and you get every platform in one list, newest first. Register a webhook with POST /v1/webhooks to receive review.created the moment a new one is synced; the webhooks reference has the payload and the signature check.

Honest limits

• Prisma reads reviews of businesses you own or manage. It is not a scraper for competitors’ reviews.
• On platforms without a reply API, Prisma can’t post for you; it returns the link and the existing reply.
• Public-page platforms are read on a schedule (every 6 to 24 hours depending on the plan), not in real time; see how often Prisma checks.
• Prisma never writes replies. Your team or your own AI writes them; Prisma publishes the exact text you approve.

FAQ

Is there a Capterra or Gartner Peer Insights API?

No. Neither publishes a reviews API for vendors. Prisma reads the public reviews on the product pages you own, read-only, with pros, cons and the vendor response where the site shows them.

Can I reply to G2 or Capterra reviews by API?

No. None of the B2B review sites expose a reply API; Prisma returns each review with its URL so you answer in the vendor portal. Trustpilot is the exception once it approves Prisma’s access.

Does the G2 connection need a paid G2 plan?

It needs a G2 API token with access to product reviews, which G2 issues to vendors with an API-enabled profile; check your G2 plan.