PURGR.DEV[BETA ACTIVE]
Registry Status: Verified System Epoch: 2026.04
Causal Accountability for AI Context Reduction.

Purgr provides absolute transparency for context compression. Every decision to remove or summarize a message is hashed into a signed Merkle tree—creating a tamper-evident audit trail of the reasoning process.

View Products Verify a Receipt
Latency Avg
29ms
TRR Peak
87%
Audit Chain
SHA-256
Runtime Deps
Zero
01 // Product Tier Manifest
Purgr SDK (Full)
THE COMPLETE DETERMINISTIC COMPRESSION ENGINE + RECEIPT SYSTEM
V1.0.2
Free Tier

Basic compression and individual receipts for small-scale projects.

  • [✓] Phase 1 Momentum Scoring
  • [✓] Basic Single-Cycle Receipt
  • [!] Max 200 msgs / 10k Tokens
  • [ ] No Phase 2 Koopman scoring
  • [ ] No reasoning trace evidence
  • [ ] No automatic section protection
Great for evaluation and small projects.
Download Free (Open Source)
Pro License

Maximum fidelity, auditability, and the strongest possible receipts.

  • [✓] Phase 1 + Phase 2 Koopman scoring
  • [✓] Full Reasoning Trace (Audit Ledger)
  • [✓] Query/Result Verification Binding
  • [✓] Multi-cycle Tamper-Evident Chain
  • [✓] Auto Document Section Protection
  • [✓] Unlimited History / Large Scale
Get Pro License
Purgr Receipt (Standalone)
LIGHTWEIGHT CRYPTOGRAPHIC ATTESTATION FOR ANY WORKFLOW
V1.0.2
Free Spec

Simple verification for manually compressed contexts.

  • [✓] Basic Single-Cycle Receipt
  • [✓] Manual Input/Output hashing
  • [ ] No automatic protections
  • [ ] No reasoning trace evidence
  • [ ] No query/result binding
Great for evaluation and small projects.
Download Free (Open Source)
Pro Spec

The independent verification protocol for complex toolchains.

  • [✓] Multi-cycle verified chaining
  • [✓] Reasoning Trace integration
  • [✓] Query/Result Verification Binding
  • [✓] Works with LLMLingua/custom tools
  • [✓] Audit Log Export (JSON/PDF)
  • [✓] Native Cryptographic Attestation
Get Pro Spec
02 // Reasoning Trace System
Native Cryptographic Attestation of Every Decision.

Traditional compression is a black box. Purgr's Reasoning Trace commits the internal scoring evidence for every message—momentum scores, decay streaks, and protection reasons—to a verifiable ledger.

Integrity Attestation
The receipt does NOT prove that "nothing important was lost." It proves exactly what was kept, what was removed, and why the algorithm made that specific choice.
03 // Implementation Protocol
SDK Inference Loop
import { Purgr } from 'purgr'

const core = new Purgr({ activeWindow: 8, anchorCount: 3 })
const { messages, signedReceipt } = core.compress(history, { 
  query: "What was the Q3 budget?" 
})

// full audit trail included in signedReceipt
04 // Procurement Registry
Tier Includes Price Action
Free Evaluation Phase 1 SDK + Single-Cycle Receipt $0 DOWNLOAD
Standard DEV Purgr SDK + Full Receipt Suite (1 Seat) $149 BUY_LICENSE
Audit PRO Pro License + Source + Support (Team) $499 BUY_LICENSE