Damien Elmes

Definition:

Damien Elmes is an Australian software developer best known as the creator of Anki, the world’s most widely used open-source spaced repetition flashcard application. Released in 2006, Anki brought SM-2-based algorithmic review scheduling to millions of learners globally.

In-Depth Explanation

Elmes created Anki as a personal project to improve his own Japanese language study, and subsequently released it freely as open-source software. The core design decision was to implement a modified version of Piotr Wozniak‘s SM-2 algorithm — which had been openly documented since 1990 — as the scheduling engine, while building around it an accessible, cross-platform interface that made the power of algorithmic spaced repetition available to anyone.

Anki’s open-source model distinguished it fundamentally from SuperMemo, the original SM-2 software, which was proprietary and Windows-only. By releasing Anki under an open license, Elmes made it possible for a global community to contribute add-ons, shared decks, and platform ports — resulting in AnkiDroid (Android), AnkiMobile (iOS), and an extensive ecosystem of community tools. This openness is a primary reason Anki eventually surpassed SuperMemo in user numbers by orders of magnitude.

Elmes has continued to maintain Anki for two decades, incorporating major updates including AnkiWeb (cloud sync), mobile clients, and most significantly the adoption of the FSRS algorithm developed by Jarrett Ye — the first major change to Anki’s core scheduling since 2006. Elmes’s willingness to integrate FSRS despite it superseding SM-2 is a model for how open-source communities can evolve technically.

Very little personal biography of Elmes is publicly available — he maintains a deliberately low profile for someone whose software has had such widespread impact. Most of what is known comes from the Anki changelog, forum posts, and GitHub contributions. This entry documents what is verifiable.

History

• Pre-2006: Elmes begins developing a spaced repetition flashcard tool for his own Japanese study, initially inspired by and experimenting with concepts from SuperMemo and the SM-2 algorithm.

• 2006: Releases the first version of Anki as free, open-source software. Implements a modified version of SM-2 as the scheduling algorithm. The name “Anki” (??) means “memorization” in Japanese, reflecting its origins in language learning. Anki is immediately adopted by language learners, medical students, and self-educators.

• 2007–2010: Anki grows rapidly through word-of-mouth, particularly among Japanese language learners and medical students studying for USMLE. Elmes develops AnkiWeb to provide cloud synchronization across devices, solving the key friction point for daily users.

• 2010: AnkiDroid, an open-source Android client, is developed by the community — independently of Elmes but built on Anki’s open format. This cross-platform availability, now free on Android and paid on iOS (AnkiMobile, developed by Elmes), dramatically expands the user base.

• 2010s: Anki becomes the dominant SRS platform globally. The shared deck ecosystem (AnkiWeb) hosts hundreds of thousands of community-created decks across languages, medicine, law, and science. A rich add-on ecosystem develops, extending Anki’s functionality far beyond its original design.

• 2022–present: Elmes integrates FSRS — the modern, machine-learning-based scheduling algorithm developed by Jarrett Ye — as an optional scheduler in Anki, marking the first fundamental change to its scheduling logic since 2006. The adoption of FSRS demonstrates the ongoing technical evolution of Anki under Elmes’s stewardship.

Common Misconceptions

“Anki was invented by Damien Elmes from scratch.” While Elmes built Anki and developed its spaced repetition implementation, the underlying SRS algorithm (SM-2) was created by Piotr Wozniak for SuperMemo in the late 1980s. Elmes adapted and extended these algorithms, created the open-source platform, and introduced the plug-in architecture — but the foundational spaced repetition mathematics predates Anki by over a decade.

“Damien Elmes is still the only developer of Anki.” Anki has grown into a community-developed project. While Elmes remains the primary maintainer and architect of Anki’s core codebase, the FSRS (Free Spaced Repetition Scheduler) algorithm — a significant improvement over SM-2 — was developed by Jarrett Ye and integrated into Anki through an open-source research collaboration. The broader Anki add-on ecosystem is maintained by hundreds of community developers.

Criticisms

Anki under Elmes’s stewardship has been criticized by some users for slow incremental updates to the desktop client interface and for the proprietary nature of AnkiWeb’s server-side infrastructure, which contrasts with the open-source desktop application. Some users have expressed frustration with the complexity of Anki’s configuration options, which can be overwhelming for new users. Critics of Anki as a language learning tool (rather than of Elmes specifically) note that the platform’s flexibility requires significant user sophistication to use optimally, and that most users use Anki far below its potential effectiveness.

Social Media Sentiment

Damien Elmes is a highly respected figure in the language learning and spaced repetition communities. Discussions of Anki on Reddit (r/Anki, r/medicalschool, r/LearnJapanese) regularly acknowledge Elmes’s foundational contribution to accessible SRS. The language learning community expresses gratitude for Anki remaining free on desktop while noting the paid mobile apps as a model that sustains development without corporate monetization. Elmes’s infrequent but substantive public communications about Anki development are eagerly followed by power users watching for feature announcements.

Last updated: 2026-04

Practical Application

For language learners, the significance of Damien Elmes’s contribution is practical: Anki’s open-source, cross-platform, highly customizable SRS platform has enabled millions of learners to implement research-backed spaced repetition at no cost. Understanding the history of Anki invites learners to engage with the platform at a deeper level — exploring FSRS as an improved scheduler, using add-ons, and participating in community card sharing.

Related Terms

• Anki
• SRS (Spaced Repetition System)
• SM-2 (SuperMemo 2)
• FSRS (Free Spaced Repetition Scheduler)

See Also

• Piotr Wozniak
• Jarrett Ye
• SuperMemo
• Spacing effect

• Sakubo

Research

• Anki Documentation. https://docs.ankiweb.net/
  Summary: The primary technical and user documentation for Anki, maintained by Elmes. Documents the SM-2 implementation, FSRS integration, and all core features. The most authoritative reference for Anki’s design decisions.

• Elmes, D. (2006–present). Anki [Software]. https://apps.ankiweb.net/
  Summary: The primary source — the Anki application itself, its changelog, and the AnkiWeb platform. The open-source repository at github.com/ankitects/anki documents Elmes’s ongoing development work.

• Wozniak, P.A. (1990). Optimization of learning [Master’s thesis]. University of Technology, Poznan. https://www.supermemo.com/en/archives1990-2015/english/ol
  Summary: The open documentation of SM-2 that Elmes drew on when building Anki’s scheduling algorithm. The direct bridge between Wozniak’s research and Elmes’s implementation.

• Ye, J. et al. (2022). FSRS algorithm documentation. https://github.com/open-spaced-repetition/fsrs4anki
  Summary: The FSRS algorithm that Elmes subsequently integrated into Anki, representing the next generation of scheduling research built on the foundation Elmes’s platform helped popularize.

Note:

• Elmes maintains a low public profile. This entry documents only what is publicly verifiable. Date of birth, educational background, and personal details are not reliably documented in public sources.
• AnkiMobile (iOS) is a paid app sold by Elmes; proceeds help fund ongoing Anki development. AnkiDroid (Android) is free and community-maintained but uses the same file format and AnkiWeb sync.