Firebase AI Logic: the App Check deadline and Gemini 2.5 shutdowns

In the Firebase console, open Security → App Check → APIs and find the Firebase AI Logic row. If it says Unenforced, click it, then Set up, choose Enforced for baseline protection, and review the considerations before continuing. Projects that set up AI Logic before early July 2026 are the ones most likely to still be unenforced. Replay protection, which makes each token single-use, needs limited-use tokens in your app and can be turned on later.

Every app version that calls Firebase AI Logic needs App Check. Versions already in users’ hands without it will fail once enforcement starts, so Firebase’s migration path is: implement a production attestation provider now, ship it, monitor the share of verified requests, and enforce once almost all recent requests are verified. Providers by platform: Apple DeviceCheck, App Attest or reCAPTCHA Enterprise; Android Play Integrity or reCAPTCHA Enterprise; web reCAPTCHA Enterprise; Flutter and Unity support the same providers, with reCAPTCHA Enterprise for Unity listed as coming soon. For local development, keep enforcement on and use the debug provider, and never commit or ship the debug token. On Android, see our guide to the Play Integrity API.

Firebase names gemini-3.8-flash and gemini-3.1-flash-image as replacements. Several weeks before a shutdown date, projects that haven’t used a model are blocked from starting to use it. Stable Gemini Live API 2.5 models and other «Nano Banana» models aren’t affected. Because Firebase AI Logic works with Remote Config and server prompt templates, you can change the model name without shipping a new app version if you set that up in advance.

From mid-2026, Firebase AI Logic authorizes requests with a Google-managed service account, the Firebase AI Logic Service Agent, instead of a standard Gemini API key. Firebase AI Logic itself is free; costs come from Gemini API usage and other Firebase services, and Firebase recommends budget alerts and spend caps. For on-device alternatives, see Gemini Nano on Android and Apple Foundation Models.

Keeping your AI feature working keeps users; being found brings them in. Censuus ranks apps by the visits they draw, and adding your app is free on the List my app form. Placement comes from traffic and sponsorship: apps climb on the visits they draw, and a sponsor can pay to rise higher.