“Short answer: the free plan (20 sentences total) is enough to genuinely test whether LanguageBank fits how you learn. If you'll use it regularly, the yearly plan is the sweet spot at about $3.33/month. Lifetime is for committed long-term learners, and monthly makes sense for short bursts — like drilling phrases before a trip.
LanguageBank is an iOS language-learning app built by an independent developer, Sean Yeoh. Instead of a fixed course, it turns sentences you actually want to say in your native language into practical, categorized study material in your target language. That model is a little different from most apps, so the real question isn't just "how much does it cost" — it's "is this the way I want to learn, and is it worth paying for?" This article breaks down the free tier, what paying unlocks, the exact prices, the per-month math, and who each plan is genuinely for.
The free plan: can 20 sentences really tell you enough?
On the free plan you can generate up to 20 sentences total — not per day, but 20 in total — and you get the full app otherwise. That means the free tier isn't a stripped-down demo with features locked behind a wall. You experience the actual product: speak or type an idea in your native language, let the AI produce a natural sentence in your target language, and then study it with all the tools that make LanguageBank distinct.
Is 20 sentences enough to evaluate it? For deciding whether the workflow clicks, yes. Twenty generations is plenty to feel out how good the sentences are for your language pair, whether the auto-categorization and color-coded highlights help you notice patterns, and whether reading aids like romaji or pinyin are accurate and useful. What 20 sentences can't do is be your long-term study bank — you'll hit the ceiling quickly if you're learning daily. That's by design: the free tier is a real test drive, not a permanent free plan.
What "unlimited" unlocks — and why generation is the core value
The paid plans remove the 20-sentence cap and give you unlimited sentence generation. Everything else in the app exists to support that one core loop, which is why generation is the thing you're really paying for. When you can generate freely, LanguageBank becomes a living, personal sentence bank instead of a fixed lesson set.
Here's what that unlimited loop feeds into:
- Speak-or-type input in your native language, with the AI (GPT-4.1-mini) generating practical sentences in your target language.
- Automatic categorization so new sentences sort themselves into useful groups instead of a single messy pile.
- Color-coded semantic highlights that help you see grammatical and meaning patterns at a glance.
- Romaji and pinyin readings for languages where script is a barrier.
- Random Five practice for quick, low-friction review sessions.
- A New view, Search, and an Activity "spaced attention" mode to keep resurfacing what you've learned.
- Cross-device sync so your bank follows you between your iPhone and iPad.
The value proposition is simple: the more sentences you generate from your own life and interests, the more the app is worth. If you only ever want a handful of set phrases, the free tier may be all you need. If you want an ever-growing bank tailored to you, that's what you're paying to unlock.
The prices
| Plan | Price | Best for |
|---|---|---|
| Free | $0 (up to 20 sentences total) | Testing whether the workflow fits how you learn |
| Monthly | $4.99 / month | Short bursts, like prepping for a trip |
| Yearly | $39.99 / year (~$3.33/mo) | Regular learners who want the best value |
| Lifetime | $99.99 one-time | Committed long-term learners who want to pay once |
Prices may vary by region and currency and can change over time — the App Store is always the source of truth. Treat the numbers here as the reference for the math below, not a promise of any specific promotion.
Breaking down the math
The three paid options are really three ways of answering "how long do I plan to use this?" Put on a per-month footing, the differences are easy to see.
- Monthly at $4.99/month is the most flexible but the most expensive per month.
- Yearly at $39.99 works out to about $3.33/month ($39.99 ÷ 12) — roughly a 33% saving versus paying monthly.
- Lifetime at $99.99 is a single payment with no renewals ever.
Where do the break-even points land? Lifetime pays for itself compared to the yearly plan in about 2.5 years (roughly $100 ÷ $40 per year). Compared to paying monthly, lifetime breaks even in about 20 months (roughly $100 ÷ $4.99 per month). So the decision is mostly about your time horizon: under a year, monthly or yearly; a couple of years or more, lifetime starts to win.
Who each tier is for
- 1Free — you're curious and want to confirm the app matches how your brain learns before spending anything. Use your 20 sentences deliberately.
- 2Monthly — you have a short, defined goal, like sounding less lost on a two-week trip, and you'd rather stop paying when it's over.
- 3Yearly — you study regularly and plan to keep going for the foreseeable future. At about $3.33/month it's the best balance of cost and commitment for most people.
- 4Lifetime — you're a long-haul learner (or juggling multiple languages over years) and you'd rather pay once and never think about renewals again.
When it might NOT be worth it for you
It's a paid app, so it's worth being honest about who won't get their money's worth. LanguageBank may not be the right pick if:
- You prefer a fixed, gamified course with streaks, levels, and a set curriculum that tells you exactly what to do next — LanguageBank is more of an open, self-directed sentence bank.
- You're on Android or Windows — LanguageBank is an iOS app, so it's simply not available to you right now.
- You rarely study. If you open a learning app once a month, you won't generate enough sentences to justify a subscription, and even the free 20 might last you a long time.
- You want guaranteed human-verified translations — the sentences are AI-generated, which is fast and practical but not a substitute for a teacher or professional proofreading.
None of these are knocks on the app — they're just cases where a different tool, or no tool, fits you better. Being clear about that upfront is more useful than pretending it's for everyone.
The bottom line
LanguageBank's pricing is refreshingly simple: try it free with 20 sentences, then pick the commitment level that matches how you learn. If you study regularly, the yearly plan at about $3.33/month is the sweet spot and the one most people should choose. If you're in it for the long haul, lifetime pays for itself versus yearly in roughly 2.5 years. And if you just need a quick boost before a trip, monthly keeps things flexible. Start on the free tier, use those 20 sentences honestly, and let the workflow — not the price tag — make the decision for you.
Try it with your own words
Speak or type what you want to say and LanguageBank builds practical, highlighted sentences you can practice right away.
Download LanguageBank