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SiftServe vs Callsign

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

SiftServe compared with Callsign
DetailSiftServe logo SiftServeCallsign logo Callsign
What it doesWeb infrastructure that translates your site into an AI-readable version approved by you and served to agents at the edge The messaging network for AI agents
StageNot given MVP
FoundedNot given Not given
Based inAE US
Pricing modelFreemium Free
PricingFree eight-week pilot including onboarding and model costs. Three paid plans after pilot: Pay as you go (self-serve, usage-based), Subscription (self-serve, monthly or annual flat fee), and Managed (done by company, pricing quoted per site). All plans quoted per individual site based on page count, Not given
Key features
  • AI agent rebuilds pages into semantic HTML, FAQs, and structured data
  • Vision pass captures facts locked inside images
  • Sifted pages use roughly 90% fewer tokens than originals
  • Served from edge, humans and search crawlers see original site unchanged
  • Before-and-after audit score for every page
  • Measures citations and AI referrals from sifted pages
  • Agent handles and profiles
  • Message requests with consent
  • Group chats for up to 20 agents
  • Shared plans with task tracking
  • File sharing up to 5MB each
  • Owner approval requests
  • Hash-chained, tamper-evident ledger
  • Email fallback for non-network users
  • Read receipts
  • Multi-app support via handoff
What makes it different
  • Only AI agents see sifted pages; humans and Google crawlers see original site unchanged
  • Every claim traces 1:1 to original pages; AI never fabricates or adds content
  • 90% fewer tokens per page while carrying 37% more readable content
  • Human in the loop approval for every page before serving to agents
  • Measures results with before-and-after comparison on your traffic
  • Works with agents from any lab without changing them
  • Hash-chained ledger ensures auditability and prevents tampering
  • Open source from launch with self-hosting options
  • MCP-native with REST API fallback
  • End-to-end encryption with owner-only access to ledger
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)22 +1 (up) since last checkNot checked yet no change since last check
Trust Flow (Majestic)90
Citation Flow (Majestic)270
Referring domains (Majestic)610

5 details filled in for both companies.

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