If you’re responsible for content quality, learning outcomes, or UX, you need a way to compare grammar explanations that’s fair, repeatable, and fast. This guide gives you a practical grammar explanation benchmark you can run in one afternoon, from CEFR A1 through B1, without guessing what’s happening inside a black box.
You’ll end with a score you can defend, plus simple assets you can hand to a team.
What you’re benchmarking (and what you’re not)
A grammar explanation benchmark doesn’t measure “which app is best” in general. It measures how well an app helps learners understand and use a grammar point as they move from beginner to intermediate.
To keep the scope tight, focus on explanation quality through three lenses used in language teaching:
- Form: What the structure looks like (endings, word order, agreement).
- Meaning: What it communicates (time, certainty, relationship).
- Use: When people choose it (context, register, typical situations).
At A1, “use” can be as simple as a short scenario. By B1, learners need clearer boundaries and contrasts.
For level framing, use CEFR as your common yardstick. If you need a quick refresher on what A1, A2, and B1 usually imply, this overview is a handy reference: https://www.olesentuition.co.uk/single-post/what-is-the-difference-between-a1-a2-b1-etc
For grammar point selection by level, you can also sanity-check against public syllabi like British Council’s A1-A2 grammar and B1-B2 grammar pages:
https://learnenglish.britishcouncil.org/grammar/a1-a2-grammar\ https://learnenglish.britishcouncil.org/grammar/b1-b2-grammar
One-afternoon setup (45 minutes)
Pick two apps (or two versions of the same app), then pick 3 grammar points that span A1 to B1. Choose points that actually show up in lessons, not just in a reference tab.
A simple set for many languages looks like this:
- A1: basic agreement (gender/number) or present tense forms
- A2: simple past reference or common pronouns/object marking
- B1: contrasts (past vs imperfect, aspect choices, relative clauses)
Next, define one learner persona so raters judge from the same seat:
- “Adult learner, 10 minutes a day, wants clear rules, gets confused by exceptions.”
Finally, decide what counts as an “explanation” in each app:
- Inline tips, pop-ups, “Guidebooks,” lesson notes, or dedicated grammar sections.
If you’re comparing popular apps, it helps to anchor terminology in their public docs. For example, Duolingo describes its research-based approach here: https://www.duolingo.com/efficacy/method, while Babbel documents its dedicated Grammar Guide feature here: https://support.babbel.com/hc/en-us/articles/19260489559058-Grammar-guide
The rubric (your scoring backbone)
Use a 0 to 4 scale for each criterion. Keep it consistent across A1, A2, and B1.
Scoring scale (0 to 4)
0 = missing or misleading
1 = minimal, hard to apply
2 = usable but incomplete
3 = clear and actionable
4 = excellent, supports transfer to new contexts
Downloadable-friendly scoring table (blank)
Criterion (0-4 each)What you look for at A1What you look for at B1Form clarityOne pattern, one simple rulePatterns plus key contrasts and limitsMeaning clarityPlain-language meaning, one scenarioMeaning differences across contextsUse and examplesShort, realistic examplesVariety, contrastive examples, mini-contextsCognitive loadChunked, not too much at onceStill chunked, handles complexity without overloadPractice alignmentExercises match the explanationPractice includes production and feedbackFindabilityLearner can find it againSearch, index, or reliable navigation
How to score fast: For each grammar point, capture 3 items per app: (1) the explanation, (2) two practice items right after, (3) any “reference” place where the learner can revisit it.
Step-by-step: run the benchmark in one afternoon (75 minutes)
1) Collect evidence (25 minutes)
For each grammar point in each app:
- Screenshot or export the explanation.
- Screenshot the first two practice prompts that follow.
- Note where the learner would go to review the rule later.
Keep a simple naming scheme: AppA_A1_Point1_Explanation, AppA_A1_Point1_Practice1, etc.
2) Rate independently (25 minutes)
Two raters score each criterion 0 to 4. Don’t discuss during scoring.
If your team is small, one rater can do it, but you’ll get more stable results with two.
3) Reconcile and compute (25 minutes)
Compare scores. For any criterion where raters differ by 2 or more, re-check the evidence together and agree on a final score.
Then total by level and by criterion. You’re looking for patterns like:
- Strong A1 clarity but weak B1 progression
- Great examples, poor findability
- Good rules, mismatched practice
Filled example: one grammar point, two hypothetical apps, A1 vs B1
Grammar point: Spanish past participles used as adjectives (agreement)
Example at A1: La puerta está cerrada (agreement with feminine noun).
At B1, learners also need the contrast where participles don’t agree with haber (e.g., La gata ha comido, participle stays in default form). This distinction often creates errors.
(If you want a quick reference for how agreement works in common A1 to B1 Spanish contexts, see the public examples summarized in the realtime notes you gathered, and validate your target usage against trusted syllabi like the British Council pages linked earlier.)
Benchmark scores (example)
LevelApp Alpha (0-24)App Beta (0-24)What changed from A1 to B1A11813Beta stays implicit, Alpha gives a clear rule and examplesB11516Beta improves with more contrasts, Alpha adds exceptions but gets dense
Criterion breakdown (A1)
CriterionApp AlphaApp BetaForm clarity42Meaning clarity32Use and examples32Cognitive load33Practice alignment32Findability22
Why App Alpha wins at A1: It states the pattern (match gender/number) and shows two minimal pairs (cerrado/cerrada). Learners can apply it right away.
Why App Beta lags at A1: The learner can infer agreement, but nothing highlights the “why.” The practice tests recognition, not rule use.
Criterion breakdown (B1)
CriterionApp AlphaApp BetaForm clarity23Meaning clarity23Use and examples23Cognitive load23Practice alignment43Findability31
Why App Beta catches up at B1: It introduces contrast sets (adjective use vs perfect tense use) and keeps each screen focused. That reduces cognitive load.
Why App Alpha dips at B1: It piles agreement, exceptions, and tense contrast into one long explanation. The content may be correct, but the page feels like a wall of text, so learners miss the key boundary.
This is the core value of a benchmark: you can see how explanation quality shifts by level, not just overall.
For broader context on how a major app publicly frames grammar learning, Duolingo’s own discussion is useful background (without treating it as proof of outcomes): https://blog.duolingo.com/does-duolingo-teach-grammar/
Short rater training guide (15 minutes)
Before rating, align on three rules:
- Rate what the learner sees, not what you assume the app “must” be doing.
- Penalize hidden explanations. If it exists but is hard to find, that’s a findability issue.
- Prefer transfer over trivia. A high score means learners can use the rule in new sentences.
Do a 5-minute calibration using one grammar point and one app. Each rater scores it, then compare and agree on what a “3” looks like for your team.
Downloadable-friendly checklist (run it every time)
- Pick 2 apps and 3 grammar points (A1, A2, B1)
- Define one learner persona
- Collect explanation + 2 practice items + review location per point
- Two raters score independently (0-4 across 6 criteria)
- Reconcile large gaps (2+ points)
- Total scores by level and criterion
- Write 3 findings and 3 fixes (one sentence each)
If you’re also comparing app positioning and experience, this kind of side-by-side product review can help you frame the overall comparison, then keep your grammar benchmark focused on explanations: https://languavibe.com/rosetta-stone-vs-duolingo-which-app-is-best-for-you/
Conclusion
A good grammar explanation isn’t long, it’s usable. Your benchmark should reward explanations that connect form, meaning, and use, while keeping cognitive load under control as learners move from A1 to B1.
Run the same rubric across both apps, keep evidence, and track the score shift by level. The result is a clean, repeatable grammar explanation benchmark you can use for audits, redesigns, or vendor selection.
