Ashr vs Respan (2026)
Updated March 27, 2026
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Overview
Rating
10.0 / 10
Rating
10.0 / 10
Best For
Teams building multi-modal AI agents
Best For
Engineering and product teams running AI agents and LLM apps in production
Product Summary
Generates synthetic multi-modal user simulations to stress-test AI agents before production, catching errors manual testing misses.
Product Summary
Respan is LLM observability built into an AI router: nested traces for every agent run, evals on live production traffic, and a click from any score to its trace.
Starting Price
Free
Starting Price
$0
Free Trial
Yes
Free Trial
Yes
Free Version
Yes
Free Version
Yes
Website
Website
Key features
Core capabilities each platform advertises.
- Multi-modal synthetic testing
- Voice/text/image simulations
- Pre-production agent stress testing
- Error detection
- Automated test generation
- Nested traces for every LLM call, tool run, and agent turn
- Threads for multi-turn sessions
- Online evals on live production traffic
- LLM-judge, code, and human evaluators
- Datasets from production logs and experiments at scale
- Monitors with Slack, email, and webhook alerts
- Prompt versioning and deployment without code changes
Strengths and tradeoffs
What each tool does well, and the limitations to keep in mind.
Pros
- Addresses critical gap in systematic testing for probabilistic AI agents
- Multi-modal coverage across voice, text, image, and file generation is rare
- Free tier lowers adoption barrier for teams evaluating the platform
- Prompt versioning with regression tracking is a strong developer experience feature
- Both founders have prior AI startup experience including a successful exit
Cons
- Very early stage with only 2 people — scaling support uncertain
- Paid pricing tiers not publicly disclosed
- Competes with Braintrust, Arize, and LangSmith expanding into agent testing
- SDK-only integration may limit adoption with non-technical teams
Pros
- Every score links to the trace that produced it
- Evals run on live production traffic, not only on test sets
- Built into the router, so there's no separate gateway to integrate
- Monitors alert the moment a metric breaches
- Unlimited seats on the free plan
Cons
- The free plan retains data for 7 days
- The free plan includes 1k scores and 2 evaluators
- Ingestion throughput is metered per tier, starting at 412 logs per minute on Free
Ashr or Respan — which should you choose?
Choose Ashr if you wantChoose if you want
- Agent testing
- Multi-modal QA
- Pre-deployment validation
- Edge case discovery
Choose Respan if you wantChoose if you want
- Debugging agent failures down to the step that broke
- Catching quality regressions before users report them
- Turning production failures into test datasets
- Testing a prompt or model change against real cases before shipping
- Attributing LLM cost to each end customer
Compare Ashr and Respan on your own traffic
10KFree traces/mo
1,000+Models
5 minSetup
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 1,000+ models through one gateway.
Try Respan free