🔨 ClozeForge

Forge
Journal.

No SEO fluff. Only rigorous empirical breakdowns: FSRS-5 memory science, cognitive linguistics, CEFR frequency roadmaps, and open-source building.

FEATURED • FSRS-5 RESEARCH
14 min read

FSRS-5 vs SM-2: Why Modern Schedulers Review Less and Remember More

A synthesis of published research and the open-source FSRS project: how difficulty/stability/retrievability modeling aims to cut review workload compared to the 1987 SM-2 heuristic — and why we made FSRS-5 the default in ClozeForge.

CF
ClozeForge ResearchResearch & Education
12 May 2026
TL;DR What the Evidence Says
DSR memory model
Scheduling approach
Open-source (AGPL) (Algorithm license)
Open-Source, Verifiable
SPANISH GRAMMAR

The Definitive Guide to Por vs Para: Real Contextual Sentences

Stop memorizing contradictory 10-point rule tables. Understand the core cognitive divide between cause (looking back) and purpose (looking forward) — and why contextual practice beats rule lists, according to published vocabulary research.

18 May 202610 min read
COGNITIVE LINGUISTICS

Why Memorizing Isolated Word Lists Fails Most Language Learners

Your brain does not store language as a dictionary lookup table. What published research on vocabulary coverage, repetition, and contextual learning says about why isolated flashcards underdeliver.

24 May 202611 min read
INDIE HACKER ETHOS

Building ClozeForge in Public: An Indie Alternative to Green Owls

Why we stayed independent, refused gamification tricks that waste your time, and engineered a local-first tactile forge on top of open research and open data.

1 June 202612 min read
ALGORITHM SPECIFICATION

FSRS-5: Decoding the 17 Weights of Spaced Repetition

A mathematical walkthrough of weights w0 through w16 and how they govern memory stability, difficulty dynamics, and retrievability curves — as specified by the open-source FSRS project.

10 June 202615 min read
SPANISH GRAMMAR

Master the Spanish Subjunctive: The WEIRDO Framework & Cloze Drills

Wishes, Emotions, Impersonal expressions, Recommendations, Doubt, and Ojalá. How repeated contextual encounters — not rule recitation — move you from hesitating to automatic conjugation.

20 June 202612 min read
ETHICS & MANIFESTO

Why ClozeForge Will Never Have Ads, Hearts, or VC Investors

The moment an educational company sells ads, its customer becomes the advertiser and the student becomes the product. Our pledge to stay indie forever.

1 July 20268 min read