Exam prompt
How do mass number and proton number change in alpha decay?
How certain was your answer?
CorrectUnsureWrong
No paywall on spaced repetition
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Quizlet and Quanta
for different study workflows
Quizlet emphasizes shared sets and its personalized Learn path. Quanta combines free FSRS review, native STEM notation and one lifetime AI flashcard generation in Starter.
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Free Starter account · no payment details
Physics · Radioactivity
Flashcard
Evidence linked directly to the card
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„Ich hab schon einige Karteikarten-Apps ausprobiert und Quanta hat mir bis jetzt am besten gefallen. […] Auch die Multiple Choice - Funktion und Prüfungssimulation helfen mir echt weiter."- TU Dresden
- Humboldt-Universität zu Berlin
- HTW Dresden
- Fachhochschule Dresden
- Universität Leipzig
- HTWK Leipzig
- Freie Universität Berlin
- IU Internationale Hochschule
- FernUniversität in Hagen
What is the best free Quizlet alternative with no paywall?
Quanta is a Quizlet alternative that keeps its core study modes free. The Starter plan is free forever with FSRS-6, up to 100 total cards and one lifetime run: 40–100 ai cards in the regular generator or 10–50 in guided onboarding; the onboarding run counts as that one run. Further AI flashcard generations require Essential; Starter has no monthly AI quota. As of June 2026, Quizlet gates its full Learn mode behind Quizlet Plus and shows ads on the free tier. Quizlet stays strong for shared sets and games.
What Quizlet got right, and where I wanted to go further
“Quizlet made flashcards mainstream, and that is a real achievement. The shared-set library is enormous and the games are genuinely fun, so I will not pretend otherwise. What I wanted to do differently was the part that drives results: keep the actual study mode free, schedule it with a peer-reviewed algorithm instead of a black box, and expose source context on cards that are actually source-backed. In Quanta, FSRS-6 and one lifetime run: 40–100 ai cards in the regular generator or 10–50 in guided onboarding; the onboarding run counts as that one run sit on the free plan; further generations require Essential.”
0.3460
log-loss of FSRS-6, lower is better
srs-benchmark (formerly fsrs-benchmark), open-spaced-repetition, retrieved 5 September 2026. That table carries no row for SM-2.
12.6%
improvement over the state of the art
Ye et al. 2022, ACM SIGKDD, on 220 million behaviour logs
about 80%
of the vocabulary pairs recalled after one week with repeated retrieval
versus 36% and 33% without further retrieval (Karpicke & Roediger 2008, Science 319:966–968)
€0
Quanta Starter, free forever
spaced repetition included, no ads
Why move from Quizlet to Quanta?
Quizlet is a capable app. These criteria show where Quanta takes a different route, and where Quizlet stays ahead.
Spaced repetition stays on the free plan
As of June 2026, Quizlet gates its full Learn mode and several practice modes behind Quizlet Plus, and the free tier shows ads. Quanta keeps its spaced repetition study mode (FSRS-6) on the free Starter plan, with no ads on study screens.
Verdict: if you want the core study mode without paying, Quanta is the direct fit. If you mainly use Quizlet's games and shared sets, those remain strong reasons to stay.
Cards are generated from your own material
On Quizlet you type sets or copy shared ones. Quanta Starter includes one lifetime run: 40–100 ai cards in the regular generator or 10–50 in guided onboarding; the onboarding run counts as that one run. Source-backed cards expose their document context in the card details. Starter has no monthly AI quota; further AI flashcard generations require Essential.
Verdict: Quanta saves manual entry and adds a source trail. If you prefer to author every card by hand, Quizlet keeps that fully manual workflow.
A published spacing algorithm, not a black box
Quizlet's Learn mode uses a Leitner-style spacing. Quanta uses FSRS-6. In the open comparison run by the open-spaced-repetition community, FSRS-6 reaches a log-loss of 0.3460 on 349,923,850 reviews from 9,999 collections (retrieved on 5 September 2026); log-loss measures prediction error, lower is better, and that table carries no row for SM-2. The peer-reviewed paper behind it, Ye et al. 2022, reports 220 million behaviour logs and a 12.6% improvement over the state of the art. Both are results of those datasets, not a blanket product effect. The algorithm is peer-reviewed and open.
Verdict: if a transparent, peer-reviewed scheduler matters to you, Quanta is the closer fit. For casual review, the difference may not be decisive.
A Readiness Score for a fixed exam date
Quizlet shows progress per set. Quanta adds a Readiness Score that estimates how prepared you are for a specific exam date from your FSRS retention data. It is an estimate, not a guarantee of passing.
Verdict: if you study toward a dated exam, Quanta gives an orientation that Quizlet does not provide.
Bringing your Quizlet sets across
Export a Quizlet set as text or CSV and upload it to Quanta; the cards are imported and scheduled with FSRS-6 from the first review. Anki .apkg decks import the same way. Quizlet does not export study history, so FSRS-6 starts its calibration fresh.
Verdict: switching costs no cards. Your Quizlet streaks and study history do not transfer, since Quizlet does not export them.
Quanta vs Quizlet, feature by feature
A factual table. Algorithm data is peer-reviewed (Ye et al. 2022).
| Criterion | Quanta | Quizlet |
|---|---|---|
| Spaced repetition on the free plan | Yes | No |
| Scheduling algorithm | FSRS-6 (2022) | Leitner-style (Learn) |
| Full Learn / study mode without paying | Yes | No |
| Ads on the free study screen | No | Yes |
| Per-card source citation (Quanta Verified) | Yes | No |
| AI card generation from files | 1 lifetime run free; then Essential | Partial (AI features) |
| LaTeX formulas | Native | Limited |
| SMILES chemical structures | Yes | No |
| Exam simulation (Socratic) | Yes | No |
| Readiness Score | Yes | No |
| CSV / Quizlet import | Yes | n/a |
| Anki .apkg import | Yes | No |
| Shared public study sets library | Smaller | Yes |
| Match / gravity-style games | No | Yes |
| Years on the market | Since 2026 | Since 2005 |
Log-loss data: srs-benchmark (formerly fsrs-benchmark), open-spaced-repetition, retrieved 5 September 2026 · Ye et al. 2022, ACM SIGKDD, doi:10.1145/3534678.3539081. Prices and feature gating as of June 2026. Pricing comparison
Pros and cons, honestly
No app is the right pick for everything. Here are the strengths and weaknesses of both tools, including our own.
Quanta
Strengths
- Spaced repetition (FSRS-6) on the free Starter plan, no ads on study screens
- Per-card source citation (Quanta Verified) for AI cards, against hallucination
- One lifetime run: 40–100 AI cards in the regular generator or 10–50 in guided onboarding; the onboarding run counts as that one run in Starter; further generations in Essential with up to 300 cards per month
- LaTeX and SMILES native, plus Readiness Score and exam simulation
- Free-forever Starter plan, also on iPhone (PWA, no app-store fee)
Weaknesses
- Smaller library of shared public study sets than Quizlet
- No match or gravity-style study games
- Younger product (since 2026), so a smaller community than Quizlet
Quizlet
Strengths
- Very large library of shared, ready-made study sets
- Familiar games (Match, and similar) that many students enjoy
- Long track record since 2005 with a large user base
- Free tier covers basic flashcards and the Test mode
Weaknesses
- Full Learn mode and several practice modes require Quizlet Plus (as of June 2026)
- Ads on the free tier
- No published FSRS implementation; Learn uses Leitner-style spacing
- No per-card source citation for AI-assisted content (as of June 2026)
The science behind FSRS-6 and active recall
In the open comparison run by the open-spaced-repetition community, FSRS-6 reaches a log-loss of 0.3460 on 349,923,850 reviews from 9,999 collections (retrieved on 5 September 2026); log-loss measures prediction error, lower is better, and that table carries no row for SM-2. The peer-reviewed paper behind it, Ye et al. 2022, reports 220 million behaviour logs and a 12.6% improvement over the state of the art. Both are results of those datasets, not a blanket product effect. Karpicke and Roediger (2008) report about 80% of the vocabulary pairs recalled after one week in the two conditions with repeated retrieval practice, and 36% and 33% in the two conditions where pairs were dropped from further testing once recalled; those figures describe that experiment and are not a general promise for every learning situation or for Quanta. The studies test the FSRS algorithm and the learning method, not the Quanta app itself.
Sources: srs-benchmark (formerly fsrs-benchmark), open-spaced-repetition, retrieved 5 September 2026 · Ye et al. 2022, ACM SIGKDD, doi:10.1145/3534678.3539081 · Karpicke & Roediger 2008, Science, doi:10.1126/science.1152408
Frequently asked questions
What is the best free Quizlet alternative with no paywall in 2026?
For students who want spaced repetition without paying, Quanta is a Quizlet alternative whose core study modes stay free. Starter includes FSRS-6, up to 100 cards in total in 1 topic, and one lifetime run: 40–100 ai cards in the regular generator or 10–50 in guided onboarding; the onboarding run counts as that one run, with no ads on study screens. Starter has no monthly AI quota; further AI flashcard generations require Essential. As of June 2026, Quizlet gates its full Learn mode and several practice modes behind Quizlet Plus. Quizlet still leads on its shared-set library and games.
Does Quizlet really put Learn and practice modes behind a paywall?
As of June 2026, Quizlet offers a free tier and a paid Quizlet Plus tier. The full Learn mode and several practice modes are gated to Quizlet Plus, and the free tier shows ads. This is a documented product fact and can change at any time, so check Quizlet directly. Quanta takes a different approach: its FSRS-6 spaced repetition study mode is available on the free Starter plan and study screens carry no ads.
Is Quanta better than Quizlet for spaced repetition?
Quanta uses FSRS-6. In the open comparison run by the open-spaced-repetition community, FSRS-6 reaches a log-loss of 0.3460 on 349,923,850 reviews from 9,999 collections (retrieved on 5 September 2026); log-loss measures prediction error, lower is better, and that table carries no row for SM-2. The peer-reviewed paper behind it, Ye et al. 2022, reports 220 million behaviour logs and a 12.6% improvement over the state of the art. Both are results of those datasets, not a blanket product effect. Quizlet's Learn mode uses a Leitner-style spacing rather than a published FSRS implementation. If a peer-reviewed scheduler is what you are after, Quanta is the closer fit. Quizlet remains strong for shared sets and games.
Can I import my Quizlet sets into Quanta?
Yes. Export a Quizlet set as text or CSV (from the set menu on Quizlet), then upload the file to Quanta and the cards are imported and scheduled with FSRS-6 from the first review. Quanta also imports Anki .apkg decks. Note that Quizlet does not export your study history or streaks, so the FSRS-6 calibration in Quanta starts fresh and settles over your first few sessions.
What does per-card source citation mean, and does Quizlet have it?
For source-backed cards generated from supported material in Essential, Quanta exposes the available document and source context in the card details. The source trail applies to cards that carry the Quanta Verified status; it is not a claim that every manual or generated card has a source. Neither Quizlet nor Anki provides this source-detail workflow as a built-in feature as of June 2026.
How much does Quanta cost compared with Quizlet Plus?
Quanta Starter is free forever with FSRS-6, up to 100 cards in total in 1 topic, and one lifetime run: 40–100 ai cards in the regular generator or 10–50 in guided onboarding; the onboarding run counts as that one run. Starter has no monthly AI quota; further AI flashcard generations require Essential, which includes up to 300 AI cards per month and starts at €9.75 per month on the annual plan (€116.99 per year). As of June 2026, Quizlet Plus is listed at 35.99 USD per year. Prices and feature gating change, so confirm both before deciding.
Does Quanta work for STEM subjects like Quizlet?
Quanta is built for STEM: mathematics, physics, chemistry, biology and computer science. LaTeX renders natively with a live preview, and SMILES chemical structures render as 2D images. From Essential, the AI generator can read supported PDFs; cards with Quanta Verified status expose their available source context. Quizlet supports basic formula text but does not render SMILES structures as of June 2026.
The verdict: Quizlet or Quanta?
As of June 2026, choose Quizlet if you rely on its huge library of shared study sets and its games, which remain its real strengths. Choose Quanta if you want FSRS-6 review and one lifetime run: 40–100 ai cards in the regular generator or 10–50 in guided onboarding; the onboarding run counts as that one run on the free plan, especially for STEM with LaTeX and chemistry structures. Quanta Starter includes up to 100 cards in total and no monthly AI quota; further AI flashcard generations require Essential, which currently includes up to 300 AI cards per month. Both are flashcard apps; the difference is paywall placement, the scheduling algorithm and source transparency.
Keep comparing
Ready for the no-paywall alternative?
Start with FSRS-6, up to 100 total cards and one lifetime run: 40–100 ai cards in the regular generator or 10–50 in guided onboarding; the onboarding run counts as that one run. Further generations require Essential.
AM
Amos Matzke·Founder & Full-Stack Architect·June 2026