FiscaLLM

FiscaLLM is an open-source AI cost and margin tracking tool for subscription applications.

FiscaLLM tracks the AI cost of every single user by adding up what each user costs in AI and comparing it to what they pay. It reads model names and token counts from AI responses while ignoring prompts and answers. Events are batched and sent in the background without blocking responses. Users connect revenue through RevenueCat, Stripe, or a revenue API, joining data on the user ID. It includes budgets, alerts, and spending caps for per-user limits.

FiscaLLM at a glance

Best for: Software engineer, Founder
Runs on: Web, API, self-hosted, open source
Pricing: Free
Released: October 2026
Category: AI productivity tool
Website: github.com/magna56/fiscallm

Key features

Reads model names and token counts from AI responses
Tracks per-user AI costs and net revenue
Connects to RevenueCat and Stripe webhooks
Sends email, Slack, or webhook alerts for budgets
Enforces per-user spending caps
Calculates exact or per-token costs automatically
Batches events in the background

Use it for

Track AI costs for every subscription user
Identify users who cost more than they pay
Set per-user spending caps and budgets
Connect revenue from Stripe or RevenueCat

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