Glossary

Plain-language definitions of the terms used across gramatic.

Generation

Model: An AI image generator you can choose in the studio. Each model has its own strengths, supported aspect ratios, parameters, and credit cost.
Tool: A model that edits an existing image instead of generating from a prompt — for example Upscale, Restore photo, or Remove background.
Prompt: The text description of the image you want. The main input for generation models.
Aspect ratio: The shape of the output, expressed as width:height (for example 1:1 square, 16:9 widescreen, 9:16 portrait).
Seed: A number that makes a generation reproducible. Reusing a seed with the same prompt and settings yields the same image; changing it varies the result. Only some models support seeds.
Reference image: An image you upload to guide a generation — to keep a subject, product, or style consistent. Supported by some models.
Prompt template: A saved, reusable prompt. Built-in templates ship with gramatic; you can also save your own. Templates may contain {{token}} placeholders. Manage them on the Templates page.
Token / placeholder: A named slot in a template written as {{name}} (for example {{brand}}). You fill it with a value when you use the template, and every occurrence is replaced.
Batch: One template generated across many sets of token values in a single API request — one image per set, sharing a batch id. Batch generation is API-only and charged all-or-nothing.

Credit: gramatic's unit of spending. Each model costs a fixed number of credits per image. You buy credits in advance.
Hold: Credits reserved against your balance when you submit a generation, so they can't be spent twice. The hold becomes a charge on success or is released on failure.
Ledger: The running record of every top-up, hold, charge, and release on your account, shown on the billing page.
Top-up: A one-off purchase that adds credits to your balance. gramatic is pay-as-you-go — there is no subscription.

Share link: A public URL with a unique token that lets anyone view a single image without a gramatic account.
API key: A secret token (prefixed gmtc_) that authenticates requests to the gramatic API on your behalf. Shown once when created.
Webhook: A URL gramatic calls when a generation completes or fails, so your code is notified instead of polling.
Idempotency key: An optional value you send with an API generation request so retrying the same request doesn't create duplicate generations.