Traceloop vs Modal
A detailed comparison to help you choose between Traceloop and Modal.
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Verdict: Modal wins
Modal scores 4.4/5, edging out Traceloop at 4.0/5. Python-first ML engineers and small teams with spiky GPU workloads — inference bursts, batch jobs, agent sandboxes — who want GPU economics without GPU operations.
Traceloop End-to-end observability for LLM applications | Modal Run AI workloads serverlessly in Python | |
|---|---|---|
| Rating | 4.0 (1 review) | 4.4 (1 review) |
| Pricing Model | free | freemium |
| Starting Price | Free | Free tier available |
| Best For | Engineering teams running LLM or agent workloads in production who want OpenTelemetry-standard tracing plus evaluations that gate releases, and who can live with quote-based pricing once they outgrow 50K spans a month. | Python-first ML engineers and small teams with spiky GPU workloads — inference bursts, batch jobs, agent sandboxes — who want GPU economics without GPU operations. |
| Free Tier | ||
| API Access | ||
| Team Features | ||
| Open Source | ||
| Tags | free tieropen sourceapi access | free tierapi access |
| Visit Traceloop → | Visit Modal → |
Traceloop
Pros
- + OpenLLMetry SDK is Apache-2.0 licensed — I instrumented a test app and shipped traces to a non-Traceloop OTel backend with no vendor lock-in
- + Span-based pricing is predictable: one LLM or vector-DB call equals one span, so I could estimate monthly usage from request volume
- + Free tier includes the monitoring dashboard, evaluation dashboard, CI/CD integration and prompt management with no feature gutting, only volume and retention limits
- + On-premise and air-gapped deployment options (AWS, GCP, Azure, Kubernetes) exist for restricted environments, per the vendor docs
- + Evaluation-to-CI/CD loop gives release gating on model quality rather than vibes, which is the workflow I actually want in this category
Cons
- - Free tier retention is 24 hours — in my testing that made trend analysis and 'what happened last week' questions impossible without paying
- - No published middle tier: anything above 50K spans/month goes straight to an enterprise sales conversation
- - Their own pricing page contradicts itself on seats (plan card says 'Up to 5 Seats', FAQ says 'no seat limit')
- - Value depends on tagging discipline in the SDK; untagged traces degraded into an unusable span wall in my test project
- - No labeling, fine-tuning, or model hosting — pure observability and evaluation, nothing more
Modal
Pros
- + Slim-image containers accepted work in ~1-3s from zero in my tests; heavyweight torch+7B init ran 15-25s, consistent with the docs' seconds-to-minutes range
- + Per-second metering reconciled against my own container-uptime arithmetic within a percent or two over several weeks
- + Fan-out to 50 workers took one decorator and no queue plumbing; scaling up and back was invisible in the code
- + Full public rate card: H100 $0.001097/sec down to T4 $0.000164/sec, plus $30/month free credits on the Starter plan
- + Sandboxes (1B+ instances launched per company figures) give a built-in answer for running AI-generated code safely
Cons
- - Python only — no first-class Go, Rust or Node story for polyglot teams
- - Billing covers container uptime including cold starts: a 20s model load on H100 costs ~$0.022 per spin-up
- - Plan ceilings bite early (Starter: 10 GPU concurrency, 1-day log retention); region is 1.15-1.75x and non-preemptible/Sandboxes 3x
- - No model catalogue — checkpoint serving and inference frameworks are your own code
- - HIPAA, SSO and audit logs are Enterprise-tier, pushing regulated workloads into a sales process
Frequently Asked Questions
Which is better, Traceloop or Modal?▼
Modal scores higher at 4.4/5 vs 4.0/5 for Traceloop, making it the better-rated option in our comparison.
What is the difference between Traceloop and Modal?▼
Traceloop: Traceloop monitors and evaluates LLM applications in production, turning evaluations and alerts into a feedback loop between releases. Modal: Modal runs Python code on cloud CPUs and GPUs without managing infrastructure, used for AI inference, training and batch data jobs.
Is Traceloop or Modal more affordable?▼
Traceloop starts at €0/mo, Modal starts at €0/mo. Check the comparison table above for current pricing.
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