Nibomo

Nibomo is a flashcard study app for people who want AI-assisted card creation alongside scheduled reviews. It is best suited to learners who value offline mobile study and broad import and export options. Its hosted app is free during beta, while self-hosting shifts infrastructure and provider costs to the operator.

Overview

Nibomo combines basic flashcards with FSRS spaced repetition, which schedules difficult cards sooner and familiar ones later. AI can help create cards, refine wording, and clarify answers, giving learners a way to work on both card preparation and review in one app. The hosted service avoids a credit-card requirement and has no plan-based quotas on cards, files, or total storage during beta, though technical limits still apply.

The open-source stack offers a different trade-off: more control over deployment, but responsibility for AWS or local infrastructure and associated costs. Aggregate activity figures do not reveal card content, email addresses, or individual study histories, and the free start page says the app has no ads.

Key features

• Spaced repetition: FSRS brings difficult cards back sooner and familiar cards later, making it a useful fit for ongoing recall practice rather than a collection of cards without review scheduling.
• AI-assisted cards: AI can generate cards, improve wording, and clarify answers. AI features are included in the hosted beta, but higher usage may later require a provider API key or paid option.
• Offline mobile study: Study on iOS or Android without an internet connection; the app syncs automatically when connected. This suits learners who need to review while offline.
• Import and export: Cards, tags, and related media can move into or out of Nibomo, giving users a portability option rather than locking their study material into the app.
• AI agent access: Agents can connect through MCP or the Agent API. The MCP server works with Claude, Cursor, or any MCP client, a distinctive option for users who want agent integrations.
• Passwordless hosted sign-in: Hosted users sign in with a one-time email code instead of a password.

Pricing

Hosted: free. The hosted service is free during beta, with AI features, sync across web, iOS, and Android, and import and export for cards, tags, and media. There is no trial countdown and no credit card requirement. No plan-based card, file, or storage quotas apply during beta, although technical limits still apply. The beta terms matter: higher AI usage may later require a provider API key or paid option.

Self-Hosted: free for the open-source application and AWS CDK infrastructure. It includes an AWS deployment path and a local Docker/Postgres setup, but the operator pays infrastructure and third-party provider costs and maintains the deployment. This is a fit for people prepared to run the service, not a way to avoid the costs of operating it.

The hosted free plan is the simpler choice for individual learners who want Nibomo without managing infrastructure. Self-hosting gives operators deployment control at the cost of maintenance and ongoing infrastructure or provider expenses.

Platforms

Nibomo works on the web, iOS, and Android. Mobile apps support offline studying and automatic sync, so a connection is not required for every review session.

Who it's for

Choose Nibomo if you want flashcards with FSRS scheduling, offline mobile review, AI-assisted card work, and the ability to import and export study materials. It is especially appealing during beta to learners who want a hosted option without a subscription charge or card requirement. Consider another app if your priority is a mature paid plan with established pricing terms, or if you do not want beta-era AI terms or self-hosting responsibilities.

Pros and cons

• Pro: Hosted access is free during beta without a credit card or trial countdown, lowering the barrier to trying the app.
• Pro: No plan-based quotas on cards, files, or total storage during beta leave room for large study collections, subject to technical limits.
• Pro: Offline mobile study, automatic sync, and import/export for cards, tags, and media support flexible study across devices and app transitions.
• Pro: MCP and Agent API access offers integration paths for AI-agent users.
• Con: Beta inclusion of AI features does not guarantee unlimited future use; higher usage may require an API key or paid option.
• Con: Self-hosting requires the operator to maintain infrastructure and pay AWS or other infrastructure and provider costs.

Alternatives

Mochi is worth considering if you want a free-forever option with no sign-up requirement and unlimited cards and decks, or need Linux, macOS, or Windows support. diStudero may suit learners who prefer a paid Pro plan with 20 credits per month, a free trial, and browser-extension support.

Recall offers a free plan capped at 3 decks and 300 cards, so it may fit someone whose collection stays within those limits. StudyGlen has a one-time Mini Pack at $4.99, paid once, with 10 study credits and five regenerations per day; consider it if that credit-based package suits your use.

Brainscape may appeal if you want a paid Pro option at $7.99 a year that includes unlimited AI flashcard creation. Cogni is another free-plan option, with spaced repetition, notes, sync, and Anki import alongside a daily review limit.

FlashLeap is an alternative for learners seeking a freemium iOS or Android app. Jambo may be a better fit if its free plan's 2,000-card, 15-deck, and daily AI-generation and translation allowances match your needs. For broader discovery, browse AI Flashcard Generators or Flashcard apps.

Verdict

Nibomo is a strong fit for learners who want an adaptable flashcard workflow: FSRS reviews, offline mobile study, AI-assisted card creation, and portable materials, all on a hosted app that is free during beta. The main reason to look elsewhere is uncertainty around future high-volume AI costs or the work and expense of self-hosting. Choose the hosted app for low-friction study now; choose another product if you need firmer long-term pricing terms.