Deltagrade
A language-learning platform that ties user-approved billing events to a transparent, provisional vocabulary-retention rule, preserves spaced-review evidence and decay, and never presents a few correct recalls as permanent learning.
Language apps usually charge for access, while learners care about words they can recall later in real context. A retention-linked commercial model sounds aligned but can become deceptive if three taps are labeled mastery, easy words are overcounted, or the learner cannot inspect or dispute the event. Deltagrade makes the review history, scheduling rule, answer evidence, provisional retention state, billing candidate, cap, dispute, reversal, and later forgetting visible as separate records.
The self-directed language learner or tutor-supported learner who wants transparent vocabulary progress and commercial terms tied to defined evidence rather than an opaque access subscription.
The input cites a May 15, 2026 vocabulary-product listing and a production-ready scheduling implementation.
Self-directed and tutor-supported language learners have a clear desire for retained vocabulary rather than seat time.
One cross-reference and no inbound connections support only modest convergence.
The learner and retention-versus-seat-time tension are concrete, a current ambient-vocabulary product and mature spaced-repetition implementations create timing, and no retention-event billing product was found.
One of three capabilities remained unverified, no structural incumbent conflict is established, tutor operations and billing disputes weaken pure self-serve economics, and the proposed amounts and intervals are product hypotheses rather than observed market references or validated learning thresholds.
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