Nibomo

Nibomo is a flashcard study app for web, iOS, and Android. Its FSRS system schedules reviews by bringing difficult cards back sooner and familiar cards later. You can study on mobile offline, with progress syncing automatically when connected. AI tools can help create cards, refine their wording, and clarify answers. Cards, tags, and related media can be imported and exported, and AI agents can connect through MCP or the Agent API. The hosted app is free during beta, with no credit card, trial countdown, or plan-based quotas for cards, files, or total storage; technical limits still apply. Higher AI usage may later require a provider API key or paid option. The open-source stack can also be run on your own AWS infrastructure, where infrastructure and third-party provider costs are separate. Hosted sign-in uses a one-time email code, not a password. Nibomo is built by Kirill Markin and operated by SAMO DANNI EOOD in Plovdiv, Bulgaria.

Nibomo combines cross-platform flashcards, offline mobile study, and spaced repetition with import and export options. The hosted beta is free, while self-hosting involves separate infrastructure and provider costs.

Nibomo suits learners who want flashcards across web and mobile, including offline mobile study. Its self-hosted option may suit people able to manage AWS infrastructure and related provider costs.

Nibomo is a flashcard app for learners who want AI-assisted card creation and scheduled review across phone and browser. It is best for people who value offline mobile study and portable cards. The hosted beta is a compelling free starting point, but its basic card format and flashcard-only study may feel limiting.

Overview

Nibomo pairs basic flashcards with FSRS spaced repetition, which brings difficult cards back sooner and familiar ones later. That makes it useful for ongoing recall practice, while AI help with creating cards, improving wording, and clarifying answers can support the work of preparing a deck. If you want more than flashcards as a study mode or more varied card formats, this is a narrower choice.

The hosted app requires no credit card and has no plan-based quotas on cards, files, or total storage during beta, though technical limits still apply. There is no trial countdown. The free start page says Nibomo has no ads. Aggregate activity figures do not expose card content, email addresses, or individual study histories.

Key features

• FSRS reviews: Difficult cards are scheduled sooner and familiar ones later, helping learners revisit material according to how well they know it.
• AI card assistance: AI can help create cards, improve their wording, and clarify answers. Higher AI usage may later require a provider API key or paid option, so the beta’s included AI should not be assumed to remain unlimited or free.
• Offline mobile study: Study on iOS and Android without an internet connection; changes sync automatically. This suits learners who need to review while offline without giving up cross-device continuity.
• Import and export: Cards, tags, and related media can be imported and exported, making it easier to carry study material into or out of Nibomo.
• Agent connections: AI agents can connect through MCP or the Agent API, and the MCP server works with Claude, Cursor, or any MCP client. This is useful for learners who want agent integrations, rather than a requirement for ordinary flashcard study.
• Passwordless hosted sign-in: The hosted app uses a one-time email code instead of a password.

Pricing

Hosted: free. The hosted service is free during beta, with AI features and sync across web, iOS, and Android. It has no plan-based quotas on cards, files, or total storage during beta, and includes import and export for cards, tags, and media. There is no trial countdown or credit-card requirement. Technical limits still apply, and 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. The deployment path includes AWS or local Docker/Postgres setup, but the operator pays separate infrastructure and third-party provider costs and is responsible for maintaining that setup. The listed price is not the full cost of running it.

There is no plan-based quota during beta on the hosted option, but it is not a promise of unlimited technical capacity. Learners who want a hosted service with sync and AI included can start without a payment commitment; self-hosting is for operators prepared to manage deployment and its ongoing costs.

Platforms

Nibomo works on the web, iOS, and Android. Mobile studying works offline and syncs automatically, while the hosted plan supports sync across all three platforms.

Who it's for

Nibomo is a good fit for learners who want basic flashcards, FSRS scheduling, AI help with card preparation, and offline review on a phone. Its portability options also suit people who want to import or export cards, tags, and media. It is less suitable for anyone who needs varied card formats or study modes beyond flashcards, or who wants to avoid managing infrastructure while still choosing a self-hosted service.

Pros and cons

• Pro: The hosted beta costs nothing and requires no credit card, with no plan-based quotas on cards, files, or total storage during beta.
• Pro: Offline mobile study and automatic sync support review away from a connection without abandoning cross-platform use.
• Pro: Import and export cover cards, tags, and related media, supporting data portability.
• Con: Basic cards and flashcards as the sole study mode limit its appeal to learners who want more varied study workflows.
• Con: Higher AI usage may later require a provider API key or paid option, making the beta’s included AI less predictable for heavy use over time.
• Con: Self-hosting means paying infrastructure and provider costs and maintaining the deployment yourself.

Alternatives

AI Flashcard Generators and Flashcard apps are useful starting points for comparing tools in those categories. For a paid option with a published monthly tier, diStudero has a Pro Monthly plan at €11.99 a month with 20 credits per month, alongside a free plan and trial; it also supports Android, iOS, web, and an extension.

FlashLeap is another freemium option with a free trial and Android and iOS apps. Mochi may suit someone who wants a free forever plan with unlimited cards and decks, or a wider desktop platform range; its Pro plan is $5 a month billed annually. StudyGlen offers one-time study-credit packs, including a $4.99 Mini Pack with 10 credits and five regenerations per day, with credits that never expire.

Brainscape has a free Basic plan with 2,500 pre-loaded flashcards and a Pro plan at $7.99 a year billed yearly, including unlimited AI flashcard creation. Cogni may fit learners who want a free tier with a daily review limit alongside spaced repetition, notes, sync, and Anki import. Jambo has a free forever plan capped at 2,000 cards, 15 decks, five AI generations per day, and 100 translations per day. Lernoa offers a free-trial-free Starter tier with five credits and unlimited decks and flashcard study.