Billing & tiers

C3NTR has plans so you can start free and grow at your own pace. Every plan includes the knowledge library — articles, glossary terms, search, favourites, and your school's branding. What changes between plans is how many students can join, whether video and audio are included, the depth of your analytics, and how much media storage you have.

The plans

• Seed (free forever) — Up to 10 students, 500 MB media storage. Articles, glossary terms, tags, search, favourites, branding, engagement basics, and the stock photo library.
• School — £39/month, or £32/month billed annually. Up to 100 students, 5 GB media storage. Everything in Seed, plus video and audio, push notifications, advanced analytics, and the stock video library.
• Academy — £69/month, or £57/month billed annually. Unlimited students, 10 GB media storage. Everything in School, plus multi-instructor publishing and priority support.

Student limits count active students only — leaders, instructors, and assistants don't use up a place on any plan. Annual billing saves roughly two months compared to paying monthly.

See the full, current comparison on the pricing page.

What every plan includes

The heart of C3NTR is available on every plan, including the free Seed plan:

• Articles and glossary terms — your written curriculum, organised with tags and grade locking.
• Your school's branding — Theme Studio and the Home screen builder, on every plan.
• Engagement basics — member counts, article views, and open rates for school leaders.
• The AI writing assistant — available on every plan. It uses an AI key you connect yourself, so there is no plan requirement.
• The stock photo library — free Pexels photos for covers and articles.

Some features are part of the School plan and above: video and audio content, push notifications to members' phones, advanced analytics (reading trends, top articles, and search insights), and the stock video library. On the free Seed plan, announcements and events still appear in the app; members just don't get a push.

When a student limit or a plan feature needs a higher plan, you will see a short prompt explaining which plan unlocks it. Nothing is lost — the feature becomes available the moment you move up.

See your current plan and make changes

Plans are changed in the web portal, not in the app. That's why you won't find prices, checkout or plan links in the app.

To see which plan your school is on, open the user menu in the app (tap your avatar on Home, or swipe in from the right edge of any tab). The plan card shows your plan, and View plan opens it.

Switching plans

A school leader can switch plans at any time from Billing in the web portal. When the change starts depends on which way you move.

• Moving up. For example, from School to Academy, or from monthly to annual billing. The change starts straight away. Stripe gives you credit for the unused part of your current plan and takes it off what you pay for the new one.
• Moving down. For example, from Academy to School, or from annual to monthly billing. The change starts at the end of the period you have already paid for. You keep your current plan until then and nothing is charged today. The portal shows the date your new plan begins.

Your students and content are not affected by a switch. Features that belong to a bigger plan stay on until the new plan begins.

Storage add-ons

If you approach your media-storage limit, the simplest step is to move up a plan for more room. Because billing lives on the website, storage questions and add-ons are handled there or by our team. Write to support@c3ntr.app and we'll help you find the right fit.