Tally vs Langfuse
Free, unlimited online forms — the Notion-style form builder
vs. Open-source LLM engineering platform — observability, prompts, evals
Pricing tiers
Tally
Free
$0. Unlimited forms, unlimited responses, unlimited fields. Tally branding. Basic question types.
Free
Pro
$29/mo. Remove branding, custom domain, conditional logic, calculations, form logic, file uploads, Stripe integration, webhooks.
$29/mo
Business
$89/mo. Workspaces, custom email domain, priority support, team collaboration.
$89/mo
Langfuse
Hobby (Cloud Free)
Free. 50k units/month included. 30 days data access. 2 users. Community support.
Free
Self-Hosted (OSS)
MIT-licensed. Docker Compose or Kubernetes deployment. Unlimited.
$0 base (usage-based)
Core
$29/month. 100k units included ($8 per 100k overage). 90 days retention. Unlimited users. In-app support.
$29/mo
Pro
$199/month. 100k units included + same overage. 3 YEARS retention. Unlimited annotation queues. High rate limits.
$199/mo
Teams Add-on
+$300/month. Adds Enterprise SSO + fine-grained RBAC + dedicated Slack support to Pro.
$300/mo
Enterprise
$2,499/month. Everything + custom rate limits, uptime SLA, dedicated support engineer. Yearly options.
$2499/mo
Free-tier quotas head-to-head
Comparing free on Tally vs hobby on Langfuse.
| Metric | Tally | Langfuse |
|---|---|---|
| No overlapping quota metrics for these tiers. | ||
Features
Tally · 13 features
- Calculator + Variables — Formulas + variables in questions (Pro).
- Conditional Logic — Show/hide, skip logic (Pro).
- Custom Domain — forms.yoursite.com (Pro).
- Embed Anywhere — Inline, popup, slider — any site.
- E-Signatures — Signature capture block.
- File Uploads — Accept file attachments (Pro).
- Notion-like UX — Block-based editor with slash commands.
- Question Types — 20+ field types (text, choice, file, rating, signature).
- Stripe Payments — Accept payments via Stripe (Pro).
- Template Library — 1,000+ community templates.
- Unlimited Free Plan — Unlimited forms + responses on Free.
- Webhooks — Real-time submission events (Pro).
- Workspaces — Team collaboration (Business).
Langfuse · 16 features
- Annotation Queues — Human reviewers rate traces. Unlimited on Pro+.
- Dashboards — Aggregate metrics, cost, quality across projects.
- Datasets — Curate test sets from production traces. Run experiments.
- EU Cloud Region — GDPR-compliant hosting in EU.
- Evaluations — LLM-as-judge, manual scores, custom model-graded evaluators.
- LLM Cost Tracking — Automatic cost calculation per provider/model.
- OpenTelemetry Native — OTel SDK → Langfuse endpoint works out of box.
- Playground — Test prompts + models + variables live.
- Prompt Management — Version, tag, label prompts. Reference from code by label.
- Public API — Full REST API for ingest, query, prompt management.
- Python @observe decorator — One-line decorator to trace any function.
- Self-Hosting — Docker Compose + k8s Helm chart.
- Sessions — Group related traces (conversations, agent runs).
- Tracing — Capture every LLM call, tool call, nested span with inputs/outputs/cost.
- Users Tracking — Segment traces by user ID, track per-user cost.
- Webhooks — Subscribe to trace completion events.
Developer interfaces
| Kind | Tally | Langfuse |
|---|---|---|
| SDK | Popup / Slider API | langfuse-js, langfuse-python |
| REST | Tally API | Langfuse REST API |
| MCP | — | Langfuse MCP Server |
| OTHER | Form Embed Script, Tally Web Editor, Tally Webhooks | Langfuse Dashboard, OpenTelemetry endpoint |
Staxly is an independent catalog of developer platforms. Some links to Tally and Langfuse may be affiliate links — Staxly may earn a commission if you sign up through them, at no extra cost to you. Pricing is verified against vendor pages at publication time — reconfirm before buying.
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