Eustella, a European AI chatbot built partly on open-weight models, has transitioned from beta to a full launch with a revamped pricing structure and a free tier that raises real questions about usability.
A free tier constrained by a weekly reset
The service promises no-cost access to anyone who wants to try it, with paid plans starting at €5.99 per month. The critical limitation, however, is the weekly measurement window. When I returned to my account after a break of roughly three and a half weeks, I discovered that exhausting the free quota on a single day means being locked out for the remaining six days of the cycle—a harsher approach than the daily resets common among larger competitors.
Eustella can display current usage statistics, so I asked the chatbot to append a percentage readout after every reply. That tracking proved deceptive. After my first three text prompts, usage stood at 5 percent. Generating an article image still left the figure at 5 percent, creating the impression of a generous allowance. A fourth image kept the display at 5 percent, yet simultaneously triggered a notice that my quota was exhausted.
Quota depletion after minimal use
In total, three text prompts and four generated images depleted my entire weekly allowance without any interim warning. The sudden cutoff also meant I could not test newer document-generation capabilities, including support for Microsoft Office formats such as DOCX, XLSX, and PPTX, which were introduced after the beta period.
The cost of operating a free tier without monetizing user data helps explain this strictness. Eustella states it does not use customer data for model training, a clear differentiator from some large providers that leverage free-tier chat histories for development. That privacy stance is commendable, but it does not soften the practical impact of a free plan that feels usable only as a short trial.
Generosity in paid plans remains an open question
Early press materials described the entry-level Comet subscription as delivering "4x usage," which, if pegged to the free‑tier volume, would still have been disappointing. The developers have since revised that framing: Comet is now presented as a "1x usage" baseline, while higher-priced tiers promise proportionally larger limits. Whether that baseline is sufficiently generous for routine work is not yet clear.
For everyday use, Eustella’s free tier falls well short of what users have come to expect. Rivals such as ChatGPT typically downgrade models or impose a next-day wait rather than a six-day freeze. Until the actual limits of the €5.99 Comet plan prove more accommodating, potential subscribers have reason to watch carefully before committing.