| Price from | £12.49/mo | $40/mo |
| Free plan | — | — |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Plans published | 4 | 1 |
| Spec score · Adaptive Learning Software | 8.1 (#9) | 7.6 (#22) |
| Adaptive learning | Its non-generative AI analyses learner performance to identify strengths, knowledge gaps and misconceptions and recommend what to study next. | Primer says future lessons reinforce missed answers and skip material a student already knows. |
| Integrations | For training providers, CENTURY lists integrations with Bud, Aptem, OneFile, eSuite and Tribal, plus a Connect API for bespoke systems. | Primer lists alignment with Common Core Math and ELA, NGSS, and C3 standards. |
| Purpose | CENTURY is an AI-powered learning platform that personalises learning and provides data insights to support teachers. | Primer provides a personalized K–12 curriculum that adapts lessons to a student’s interests, answers, and learning needs. |
| Support | School customers receive onboarding, staff training, implementation help, ongoing support and monthly usage reports. | Each student has a named Primer teacher with an email address, and the site says replies usually arrive within a few minutes. |