Built for people with a target band
Score it. Not guess it.
Every number Synolang shows you traces back to a formula grounded in the IELTS descriptor framework. The AI adjusts within ±0.5 bands of what the deterministic engine already computed — not the other way around.
What chatbots can't do
ChatGPT, Gemini, and Claude can explain IELTS concepts. They cannot measure you.
"I'd give this around Band 7" — a guess that shifts depending on how you phrase the question.
Fluency: 6.5 — speech rate 91 WPM, pause ratio 0.19, filler density 0.08. The number has a source.
Same essay, different day, different prompt framing — different score.
Same answer → same formula → same band range. Always.
Can read a transcript. Can't hear audio. Fluency, rhythm, pronunciation: not measurable.
Full word-level timing from ASR. Pause gaps measured in milliseconds. Phoneme patterns detected per word.
What you get
Seven tools across Writing, Speaking, and Listening — each built around one pedagogical principle, not a list of features.
AutoEvaluatorW
Not 'your grammar is weak.' The exact clause. The exact reason.
Sentence-by-sentence diff with a mandatory reason on every edit — the AI cannot rewrite without explaining. Criterion-split bands (TA / CC / LR / GRA) so you know which number to move.
AutoWriter
A Band 9 essay won't help a Band 6 learner.
Model essays calibrated to your target band — the vocabulary range, clause density, and linker frequency you're actually working toward. Not an aspirational ceiling you can't yet internalize.
Paraphraser
Meaning blocks before synonyms. Always.
The pipeline locks semantic meaning blocks and fixed keywords before any rewriting begins. You can't skip to the surface swap. That constraint is the lesson — the same one a good writing teacher enforces.
AutoEvaluatorS
Four criteria. Because fluency and pronunciation need different fixes.
Deterministic acoustic features — speech rate, pause ratio, filler density — computed first. LLM adjusts ±0.5 max. Grammar forgiveness built in: false starts and repairs carry 0.4 weight, not 1.0.
ShadowCamp
You dropped the final /t/. Stop the airflow with your tongue tip.
After every take: character-level diff, phoneme diagnosis, articulatory instruction. Speaking fluency is a motor skill. You close the gap by repeating until the gap closes — not by reading about it.
AutoSpeak
Hear it. Shadow it. Record it under exam pressure.
Three modes on the same model answer. Adaptive difficulty never jumps more than one tier — medium to hard requires authenticity ≥ 0.85 AND fluency band ≥ 7.0. Earned, not handed over.
Daily Dictation
Type every word. Including the ones that disappear.
IELTS Listening blanks test prepositions, weak forms, articles — the words that collapse in connected speech. Comprehension drills skip them. Dictation forces them. 0.25×–2× playback. Per-word TTS isolation.
One tradeoff worth knowing
A chatbot responds in 2–5 seconds. Writing evaluation on Synolang can take up to 10 minutes; speaking evaluation runs synchronously in 15–40 seconds. If you want instant feedback, a chatbot is faster. If you want a score you can act on — one that tells you your pause ratio is 0.19 and needs to come below 0.16 — the wait is the price.
The exam doesn't guess. Neither do we.
Start with the skill that's costing you the most points.
Start practicing free