StudyLoop

Changelog

What changed on StudyLoop, in plain language.

v0.1-alpha.25— Applications of integration bank

  • AP Calculus AB Unit 8 is now live with 12 topics covering average value, motion and accumulation in context, area between curves, cross sections, disks, and washers.
  • Added 60 original MCQs and 12 original FRQs, including graph-based region, cross-section, disk-method, and washer-method items.
  • Added simple SVG sketches for area-between-curves, cross-section, disk, and washer problems, with explicit axes of rotation for x-axis, y-axis, and shifted-axis volumes.
  • The reviewer export, MC feedback audit, and originality audit scripts now include Unit 8.

v0.1-alpha.24— Differential equations bank

  • AP Calculus AB Unit 7 is now live with 7 AB topics across modeling, verification, slope fields, separation of variables, particular solutions, and exponential models.
  • Each topic has 5 original MCQs and 1 original FRQ, for 35 MCQs and 7 FRQs total.
  • Kept Euler's Method and Logistic Models out of the AB bank because those Unit 7 topics are BC-only.
  • Added generated slope-field figures whose line segments are computed from the differential equation instead of hand-drawn.
  • The reviewer export and MC feedback audit scripts now include Unit 7.

v0.1-alpha.23— Unit 6 AP-style framing repair

  • Rewrote Topic 6.1 graph-area prompts so students infer the rectangle, triangle, semicircle, trapezoid, and signed area from the figures instead of being told the method in the stem.
  • Removed giveaway wording from the Topic 6.1 composite FRQ prompt while preserving the same mathematical targets.
  • Softened direct method labels in later Unit 6 FRQs so prompts ask for exact evaluation while hints and solutions carry the technique guidance.
  • Regenerated the Unit 6 reviewer package after the framing repair.

v0.1-alpha.22— Unit 6 figure scale repair

  • Redrew the Topic 6.1 composite signed-area FRQ figure with a consistent x/y scale.
  • Fixed the semicircle in the composite graph so radius 2 is visually faithful instead of stretched taller than the rectangle.
  • Regenerated the Unit 6 reviewer package after the figure repair.

v0.1-alpha.21— Unit 6 topic numbering repair

  • Renumbered Selecting Techniques for Antidifferentiation from Topic 6.14 to Topic 6.11 in StudyLoop's student-facing sequence.
  • Updated the technique-selection item URLs from t6-14 to t6-11 to avoid the 6.11-6.13 gap confusing students.
  • Regenerated the Unit 6 reviewer package after the numbering repair.

v0.1-alpha.20— Unit 6 introduction repair

  • Rebuilt Topic 6.1 so it introduces integration through geometric and signed area instead of later integral-property and FTC-style ideas.
  • Added rectangle, triangle, semicircle, trapezoid, and composite signed-area sketches to the opening Unit 6 topic.
  • Kept existing Topic 6.1 URLs stable while replacing the misplaced additivity and total-change items.
  • Regenerated the Unit 6 reviewer package after the introductory-topic repair.

v0.1-alpha.19— Unit 6 completion repair

  • Added Selecting Techniques for Antidifferentiation with 5 MCQs and 1 FRQ.
  • Repaired the Unit 6 Riemann-sum sketch so the left-endpoint rectangles match f(x)=x^2 on [0,4].
  • Updated Unit 6 reviewer and manual verification counts to 11 topics, 55 MCQs, and 11 FRQs.
  • Regenerated the Unit 6 reviewer package after the technique-selection and figure repairs.

v0.1-alpha.18— Unit 6 topic alignment repair

  • Repaired Unit 6 Topic 6.1 items that used exact antiderivative evaluation even though the topic is about accumulation meaning and setup.
  • Replaced a Topic 6.3 item that asked students to evaluate a represented integral with a notation-matching item.
  • Replaced a Topic 6.10 plain substitution item with a long-division integration item.
  • Regenerated the Unit 6 reviewer package after the topic-placement repairs.

v0.1-alpha.17— Integration question bank

  • The first AP Calculus AB Unit 6 pass went live with 10 topics across accumulation, Riemann sums, definite integrals, FTC, antiderivatives, substitution, and algebraic integration.
  • Each topic has 5 original MCQs and 1 original FRQ, for 50 MCQs and 10 FRQs total.
  • The new Unit 6 questions avoid Foundational difficulty and target AP routine through Challenge rigor.
  • Added simple SVG sketches for signed area, Riemann sums, and accumulation-function graph reasoning.
  • The reviewer export and MC feedback audit scripts now include Unit 6.

v0.1-alpha.16— Unit 5 polish repair

  • Aligned the Unit 5 Topic 5.9 f prime sketch so its minimum matches the f double prime sign change at x=2.
  • Added the Unit 5 FRQ difficulty floor for parity with earlier Calc AB units.
  • Regenerated the Unit 5 reviewer package after the polish repairs.

v0.1-alpha.15— MCQ feedback repair

  • Replaced Unit 5's generic wrong-answer fallback with diagnostic feedback that names the likely mistake and points to the decisive calculus step.
  • Updated MCQ, focus-practice, and review feedback panels to show a clear 'Where this choice goes wrong' explanation.
  • Added an MC feedback audit script so missing or generic wrong-choice rationales are caught before reviewer packages are shared.
  • Regenerated the Unit 5 reviewer package with repaired feedback.

v0.1-alpha.14— Unit 5 vet repair

  • Added the same multiple-choice difficulty floor safety net to Unit 5 that Units 1-4 already used.
  • Repaired Unit 5 derivative graph sketches so labeled x-values use a consistent horizontal scale.
  • Added a graph-based Topic 5.9 FRQ figure connecting f, f prime, and f double prime.
  • Regenerated the Unit 5 reviewer package after the content repairs.

v0.1-alpha.13— Analytical applications bank

  • AP Calculus AB Unit 5 is now live with 12 topics across MVT, extrema, monotonicity, concavity, derivative graphs, optimization, and implicit-relation behavior.
  • Each topic has 5 original MCQs and 1 original FRQ, for 60 MCQs and 12 FRQs total.
  • The new Unit 5 questions avoid Foundational difficulty and target AP routine through Challenge rigor.
  • Added simple SVG sketches for graph-reading, derivative-sign, concavity, and optimization items.
  • The reviewer export script can now create a Unit 5 review package with `pnpm review:export -- u5-analytical-app`.

v0.1-alpha.12— Graph alignment repair

  • Audited hand-authored graph SVGs for points that did not sit on their curves.
  • Fixed the Unit 1 Topic 1.9 hole-at-(3,5) graph so the open circle lies on the drawn line.
  • Fixed the Unit 1 Topic 1.9 hole-at-(2,4) graph so the open circle lies on the drawn line.
  • Regenerated the Unit 1 reviewer package with the corrected graph source.

v0.1-alpha.11— Limits graph vet repair

  • Fixed the removable-discontinuity graph coordinate bug where the point labeled -1 was drawn above the x-axis.
  • Added graph figures to Unit 1 Topic 1.9 multiple-representation items that previously used prose stand-ins.
  • Added a graph figure to the Unit 1 Topic 1.10 discontinuity-types FRQ.
  • Cleaned a misleading Unit 2 skill tag on a text-only tangent-line slope item.

v0.1-alpha.10— Graph practice repair

  • Practice-session mode now renders question figures, so graph items are not missing diagrams during focus practice.
  • Every AP Calculus AB Unit 1 Topic 1.3 graph-reading item now has a student-facing SVG graph.
  • Graph-reading stems now ask students to use the graph instead of describing the graph behavior in prose.
  • Question figures now scale to the available width instead of forcing horizontal scrolling on small screens.

v0.1-alpha.9— Graph figures and motion cleanup

  • Added optional SVG figures to StudyLoop questions and rendered them on item pages for graph-reading practice.
  • Attached actual graph figures to the Unit 1 graphical limits MCQ and FRQ that previously described the graph only in words.
  • Replaced the Unit 4 motion questions that used displacement, total distance, and integrals with derivative-only velocity, acceleration, direction, and speed-behavior practice.
  • Reviewer exports now include figure titles, descriptions, and SVG source for mentor review.

v0.1-alpha.8— Limits rigor repair

  • Repaired AP Calculus AB Unit 1 after mentor vetting by replacing the low-rigor recall and read-off MCQs with applied limit, continuity, asymptote, and IVT items.
  • Unit 1 now has zero Foundational difficulty items while keeping the same stable item URLs.
  • The Unit 1 content version is now v0.3.0 and remains marked Needs mentor review until a subject mentor signs off.

v0.1-alpha.7— Contextual applications bank

  • AP Calculus AB Unit 4 is now live with 7 topics across derivative interpretation, motion, applied rates, related rates, linearization, and L'Hospital's Rule.
  • Each topic has 5 original MCQs and 1 original FRQ, for 35 MCQs and 7 FRQs total.
  • The new Unit 4 questions avoid foundational recall labels and target AP routine through AP hard rigor.
  • The reviewer export script can now create a Unit 4 review package with `pnpm review:export -- u4-contextual-app`.

v0.1-alpha.6— Student difficulty guide

  • Added a plain-language difficulty guide to unit pages and item pages.
  • Difficulty labels now explain the difference between Foundational, AP routine, AP medium, AP hard, and Challenge.
  • The guide reminds students that the label describes the problem, not their ability.

v0.1-alpha.5— Composite and implicit differentiation bank

  • AP Calculus AB Unit 3 is now live with 6 topics across chain rule, implicit differentiation, inverse functions, inverse trigonometric derivatives, mixed procedure selection, and higher-order derivatives.
  • Each topic has 5 original MCQs and 1 original FRQ, for 30 MCQs and 6 FRQs total.
  • The new Unit 3 questions start at AP routine difficulty and emphasize tangent lines, error analysis, table-based inverse derivatives, motion, and mixed derivative procedures.
  • The reviewer export script can now create a Unit 3 review package with `pnpm review:export -- u3-comp-implicit`.

v0.1-alpha.4— Differentiation question bank

  • AP Calculus AB Unit 2 is now live with 10 Differentiation topics.
  • Each topic has 5 original MCQs and 1 original FRQ, for 50 MCQs and 10 FRQs total.
  • Questions target AP style or slightly above AP rigor across derivative definitions, estimates, differentiability, and first derivative rules.
  • The reviewer export script can now create a Unit 2 review package with `pnpm review:export -- u2-differentiation`.

v0.1-alpha.3— Review notebook

  • Added a local Review page that stores missed MCQs and FRQ rubric gaps for the active nickname profile.
  • Wrong MCQ answers are saved automatically from item pages and practice sessions.
  • Review practice lets students retry saved MCQ errors and moves them to Mastered when answered correctly.
  • FRQ self-scoring now saves missed rubric points so students can reopen those prompts later.

v0.1-alpha.2— Full Limits question bank

  • AP Calculus AB Unit 1 now has all 16 Limits and Continuity topics live.
  • Each topic has 5 original MCQs and 1 original FRQ, for 80 MCQs and 16 FRQs total.
  • Item URLs now include the topic, such as t1-1-mc-001, so questions from different topics do not collide.
  • All new content is marked Needs mentor review until a teacher verifies it.

v0.1-alpha.1— Local nickname memory

  • Added browser-local nickname profiles so students can separate progress without real names, email, passwords, or server accounts.
  • Practice sessions now resume where the student left off for the active nickname or Guest profile.
  • Multiple-choice attempts and free-response drafts now save locally on the same browser.
  • Public privacy copy now explains that clearing browser data deletes this local memory.

v0.1-alpha— Broad STEM direction set

  • StudyLoop is now framed as a broad STEM practice platform for CBSE, AP, SAT, and IIT-JEE.
  • AP Calculus AB remains the first live track while the wider platform structure is prepared.
  • First Calc AB content slice launched with Unit 1, Topic 1.6 draft practice.
  • Public copy now explains that CBSE, JEE, and SAT are planned tracks, not live content.
  • Alpha reporting language is honest: item issues should be noted by URL and content ID until a report form ships.

Impact notes should begin only after the site has real student usage. Until then, this page records product and content changes in plain language.

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