If you're just getting started, the Power User plan is a great way to try out Cellm. If you need more powerful models or are part of a larger team, the Professional or Teams plans would be a better fit. Choose Professional if you prefer using your own API keys. Choose the Professional plan if you prefer to just get stuff done. We will handle API keys, payment for model usage, and make sure the model providers don't use any of your data for training their models. Choose the Teams plan if you also want central billing or more credits.

No, we do not offer a free trial.

An API key is a unique identifier that authenticates your direct requests to use hosted models. When you use your own API key, you're responsible for managing your own billing relationship with the model provider. When you use Cellm's hosted models on the Professional or Teams plans, we manage the API keys and billing on your behalf, and you pay via your subscription instead.

You can learn more about our privacy policy here and about our security policy here. In short, we take security and privacy very seriously because we are an independent, bootstrapped company that relies entirely on your trust instead of ads or selling user data.

No, we never save any data from your spreadsheets. If you use your own API key to other model providers, you need to read their privacy policy because whether they use your data or not is between you and them. If you don't login to the Cellm client, we save your prompts to understand how you use Cellm so we can improve it, but even here we specifically and deliberately do not save any data from your spreadsheet.

Billing works on a monthly subscription cycle and you are charged at the beginning of each cycle. All payments are processed securely through Stripe.

• For the Power User plan ($9), you pay a flat monthly subscription fee to Cellm. Any usage costs from hosted AI models are billed to you directly by those providers, not Cellm.
• For the Professional plan ($5/month), your monthly subscription includes a $20 credits that covers your usage Cellm-managed Google models. We pay Google for your usage, deducting from your credit. Any usage beyond the $20 credit is paused until your next billing cycle. You can renew your billing cycle whenever you want to top up your account.
• As an administrator of your Teams plan, your monthly subscription includes a $40 credits for each of your team members' usage of Cellm-managed Google models. We pay Google for your usage, deducting from your credit. Any usage beyond the $40 credit is paused until your next billing cycle. You can renew your billing cycle whenever you want to top up your account.

You can view your billing history and manage your subscription details in your account settings.

If a scheduled payment for your subscription fails, your account will remain active but you will lose access to the paid features. Our payment processor, Stripe, will automatically attempt to retry the payment a few times over the following days. We will also send you email notifications informing you about the failed payment and providing instructions on how to update your payment method. You can update your card details or payment method directly in your dashboard.

Yes, you can switch plans at any time. The change is applied at the beginning of you next billing cycle.

No, we do not offer any discounts.

Yes, see our refunds page.

Yes, you can cancel your subscription at any time. If you cancel your subscription, you will still be able to use Cellm until the end of your billing period. After that, you will be downgraded to an inactive plan.

We use the pricing on Google's pricing page. For example, Google charges $0.15 per million input tokens and $0.6 per million output tokens for Gemini 2.5 Flash. For each prompt, we calculate the cost from the length of your prompt and model's response and deduct the cost from your balance. We don't charge anything on top of your usage. Taxes, fees to our payment provider, and any other expense on our part is covered by the $9/month base fee.

Most providers typically calculate costs as $X per million input tokens plus $Y per million output tokens. Look up the numbers on your provider's pricing page.

Access to Cellm-managed models will be paused until your next billing date. However, you can renew your subscription immediately and continue using hosted models without interruption. Alternatively, you can switch to local models or bring your own API keys (BYOK) at any time.

Unused credits do not roll over to the next month. If you consistently have leftover credit, you might consider adjusting your usage patterns or exploring more powerful models.

BYOK allows you to use your own API key from model providers instead of using Cellm's hosted models. This option is available on all plans. When you use BYOK, you manage your own billing relationship with the model provider directly, and your data is sent only to the model provider without going through Cellm's servers.