Compare · 2026
Glow vs Langfuse
Langfuse is a great open-source tool for engineers: traces, evals, prompt management and cost per trace (ClickHouse acquired it in January 2026). Glow is for the person paying the bill: spend by model, key and product, next to revenue, from the providers’ own usage data.
Langfuse priceFree (cloud hobby or self-host); Core $29/mo; Pro $199/mo
How it worksSDK or OpenTelemetry instrumentation
OwnerClickHouse (since January 2026)
From langfuse.com/pricing, checked October 2026. Prices change; check theirs before you buy.
Side by side
| Langfuse | Glow | |
|---|---|---|
| Revenue sources | No | Stripe (one or several accounts) |
| One view per product | By project you instrument | Yes: a product tree with channels under each product |
| Costs: hosting, SaaS, cards, bank | No | Ramp card spend, Cloudflare and AI bills; keep-or-cancel for unused SaaS |
| AI spend by model and key | Yes, per trace | Yes: OpenRouter and Cloudflare, per key and product, against revenue |
| SEO and analytics joined to revenue | No | Search Console, GA4 and PostHog joined to Stripe: clicks → signups → $ |
| Explains what changed | No | AI caption on every chart, daily briefing, “Glow found” nuggets with proof |
| Agents that act on the numbers | No | Daily agents grounded in your numbers; dispatch to Claude Code or Devin |
| Phone app | Web | Phone-first (iOS, Android), with web |
| Setup | Instrument your code | Read-only keys, about a minute per source |
| Price | Free, then $29 to $199 a month | Solo $19, Pro $49, Studio $99 a month |
Which one should you pick?
Pick Langfuse if
- You’re an engineer who needs traces, evals and prompt versioning.
- You want to self-host your observability.
Pick Glow if
- You want spend per product and key without instrumenting anything.
- You want to compare AI cost with revenue.
- You want the cheaper-model suggestion, tested on your task.
Or use both. Engineers keep Langfuse for traces; the owner uses Glow for the bill.
Related
Glow vs Langfuse: questions
Is Glow a Langfuse alternative?
Only for cost tracking. Glow doesn’t do traces or evals for your app. It shows what AI costs each product, from provider usage data, next to revenue.
Light up your numbers.
Join the beta. Connect Stripe and one AI key, and see every product’s money in, money out and AI bill in about a minute.
- Read-only keys
- Never shown again
- 2FA + Face ID
- 7-day trial