Pricing
Energy-unit billing for Flowzart workflows: subscriptions, PAYG packs, and what's included.
Flowzart bills workflow compute in watt-hours (Wh) and kilowatt-hours (kWh). If that’s a strange unit to see on a software bill, the short explainer walks through why and what’s actually being measured. The tables below cover the numbers.
Energy units
Subscriptions are priced in Wh per month. PAYG packs are priced per fixed Wh quantity. One Wh is roughly 25 LLM-using workflow runs; one kWh is about 25,000.
Subscriptions
| Tier | Per month | Allowance | Effective €/Wh | Roughly |
|---|---|---|---|---|
| Spark | €0 | 1 Wh | n/a | ~25 LLM-using runs |
| Studio | €19 | 100 Wh (0.1 kWh) | €0.190 | ~2,500 runs |
| Ensemble | €89 | 1,000 Wh (1 kWh) | €0.089 | ~25,000 runs |
| Maestro | €189 | 5,000 Wh (5 kWh) | €0.0378 | ~125,000 runs |
The monthly allowance resets every billing cycle. Unused Wh from a subscription month do not roll over.
Spark is permanently free at 1 Wh per month, enough to try Flowzart end to end without a card on file. The other three tiers are subsidised relative to pay-as-you-go: more Wh per euro than the equivalent PAYG pack, and the price per Wh keeps dropping as the tier rises.
PAYG packs
| Pack | Price | €/Wh |
|---|---|---|
| 100 Wh | €20 | €0.200 |
| 1 kWh | €150 | €0.150 |
| 5 kWh | €600 | €0.120 |
| 25 kWh | €2,500 | €0.100 |
Every PAYG pack is valid for one year from purchase. PAYG balance survives subscription cancellation: if a subscription lapses, the PAYG Wh remaining on the account stay there until they’re spent or their one year is up, whichever comes first.
PAYG is the right call when usage is occasional or unpredictable. The €/Wh is higher than a comparable subscription, but every Wh sits on the account until used.
Subscriptions vs PAYG
The subscription tiers are subsidised relative to PAYG, and the subsidy steepens at each step up:
| Tier | €/Wh subscription | €/Wh equivalent PAYG | Effective discount |
|---|---|---|---|
| Studio | €0.190 | €0.200 (100 Wh pack) | ~5% |
| Ensemble | €0.089 | €0.150 (1 kWh pack) | ~41% |
| Maestro | €0.0378 | €0.120 (5 kWh pack) | ~69% |
Another way to read the same shape: the Wh a euro buys roughly doubles at each tier up. Studio gives ~5.3 Wh per euro, Ensemble ~11.2, Maestro ~26.5. Each step up roughly doubles the energy a euro buys.
The choice is mostly about predictability. A subscription is the better deal at known monthly volumes. PAYG is the better deal when the volume is unknown, sporadic, or below the next tier’s allowance.
Third-party costs
A Wh measures Flowzart-side resources only: compute, memory, network, and storage on Flowzart’s infrastructure.
Third-party services that a workflow calls (LLM providers, webhook destinations, transactional email, image APIs, anything that hits an external endpoint) are billed directly by those services against the user’s own API keys. Flowzart’s meter doesn’t see those costs and doesn’t bill for them.
For the analogy and a fuller breakdown of what a Wh actually covers, see What the hell is a kilowatt-hour?.