An online English grammar checker helps correct text you have already written. Learning vocabulary takes a longer sequence: choose the word you need, use it independently, understand a mistake, and return to the word later. Grammarly, LanguageTool, QuillBot, Write & Improve, AI chats such as ChatGPT, and LetsWords cover different parts of that sequence.
The difference becomes obvious when a correction looks familiar but the mistake returns a week later. You write suggest me to… in another email. You remember having the sentence checked, yet reach for the same incorrect construction when writing again.
LetsWords combines vocabulary practice with sentence feedback. You write with a target word, receive explanations of its use and the grammar, then practise the word again through spaced repetition. If your goal is to learn to use vocabulary, LetsWords provides the learning process as well as the correction.
Compare the same actions in each tool
The table compares text checking in Grammarly, LanguageTool, and QuillBot, learning prompts in AI chats (ChatGPT, Claude, Gemini), and vocabulary practice in LetsWords. The key difference comes after a correction: who organises the next attempt and brings the word back for review?
| Feature | LetsWords | Grammarly | LanguageTool | QuillBot | ChatGPT, Claude, Gemini |
|---|---|---|---|---|---|
| Corrects English text | Sentence checking and a separate IELTS Writing mode | Corrections to submitted text | Corrections to submitted text | Corrections to submitted text | On request |
| Explains a mistake | Brief or detailed feedback: what’s wrong and how to fix it | Explanations accompanying suggestions | Messages about detected errors | Explanations of corrections | You specify the language and detail in the prompt |
| Practises a particular word you are learning | The target word defines the exercise; its use is checked | Checks the document; no separate target-word exercise in the checker | Checks the document; no separate target-word exercise in the checker | Checks the document; no separate target-word exercise in the checker | You supply the word and checking instructions |
| Brings the word back for review | Spaced repetition informed by response history | Does not return the corrected word as a vocabulary review exercise | Does not return the corrected word as a vocabulary review exercise | Does not return the corrected word as a vocabulary review exercise | For these sessions, you provide the list and review sequence |
| Supports an IELTS goal | Exam-focused checking, vocabulary sets, and Writing practice | Checks the language of the text | Checks the language of the text | Checks the language of the text | You provide the task and assessment criteria |
Correcting a document and reviewing a word produce different results. One gives you text ready to send. The other makes you retrieve the word and use it in a different situation. That second action is part of vocabulary review in LetsWords: the service checks what you write, so a construction error is addressed inside the exercise.
One mistake that can follow you into the next email
You want to report a colleague’s recommendation and write:
My colleague suggested me to contact the supplier.
What the LetsWords feedback explains. In this meaning, suggest does not follow the pattern suggest someone to do something. That is the pattern of another verb, advise. With suggest, you can name the action using -ing, or use a that clause to say who should perform it.
A correction that keeps the recipient of the advice explicit:
My colleague suggested that I contact the supplier.
A shorter option when the person is clear:
My colleague suggested contacting the supplier.
The feedback keeps suggest, the word being studied, and explains how to express the idea with it. In your next attempt, report a different recommendation, such as moving a meeting. You will have to choose the construction again instead of copying the corrected line.
On suggest vs offer, you can check a sentence with your chosen word for free. The page also shows another useful distinction: proposing an idea differs from offering to help.
See what this kind of feedback finds in the vocabulary you are learning now.
Grammarly, LanguageTool, and QuillBot: what happens after the correction?
In Grammarly, LanguageTool, and QuillBot, you accept a correction in a document. These tools can check your next email too. But another attempt with the same word is up to you: choose a situation, write a sentence, and return to the construction later.
In our example, the email reporting the recommendation is ready. To learn suggest, use it again, perhaps about rescheduling: She suggested moving the meeting to Thursday. If suggested me to move comes to mind again, you need practice with the construction, not another saved correction.
LetsWords keeps the word you are learning at the centre of the session. You study suggest and have its use checked. During review, looking at the corrected email is not enough: you must retrieve the word and construct a sentence. The combination becomes something you can produce when expressing an idea.
This matters particularly for recurring work situations: deadlines, results, responsibilities, and problems. You need these constructions repeatedly, so a forgotten correction can affect the very next exchange.
Write & Improve, Speak, and ELSA: what do they check?
Write & Improve from Cambridge is a free checker for texts written on a set topic. It highlights words and sentences to revise and estimates the level of the work on the CEFR scale. It does not build an exercise around a word you are learning, and a word you got wrong does not come back to you for review.
Speak and ELSA focus on speaking: conversation with an AI partner and pronunciation practice. They do not analyse a written sentence built around a new word.
LetsWords covers exactly that step: the target word defines the exercise, the feedback explains the mistake in its use, and spaced repetition makes you recall the word and apply it to a new idea.
ChatGPT, Claude, and Gemini: you need to set up and maintain the learning prompt
You can ask ChatGPT, Claude, or Gemini to check a target word, explain an error in your preferred language, and give you another situation. However, “correct my English” does not identify the word you are studying, the difficulty you need, or whether the chat should wait for your answer.
For vocabulary practice, you need to specify those conditions: name the word, describe the goal, ask for the answer to be withheld, and bring back material from previous sessions. This preparation recurs as you continue learning.
In LetsWords, you select a set and start writing. The target word is already assigned, your explanation language is already set, and review takes response history into account. You do not need to keep instructing a chat to wait for an attempt, retain the studied word when correcting it, and return it to a later session.
See how an AI English tutor can support vocabulary practice for the wider learning scenario. The practical question here is how much preparation you need before you begin using the words you want to learn.
What changes when you are preparing for IELTS?
IELTS preparation requires more than making a sentence sound formal. You need to preserve its precise meaning, choose an appropriate word combination, and respond to a particular task. A polished paraphrase cannot replace practice in making those decisions.
LetsWords takes an exam goal into account when checking sentences. You can continue in IELTS Writing, with Academic and General Training tasks, practice for each of the four assessment criteria, and feedback on complete responses. The reference guide supports preparation before writing; the feedback connects its observations to specific parts of your text.
For example, you might first learn have an impact in a single sentence. Later, you can use it in a longer response when it expresses the relationship you actually mean. LetsWords lets you practise at both scales while keeping word use in view.
See the difference with a free attempt
For another free sentence check, open take responsibility. Write which work task you will take responsibility for. After for, you need a noun or an -ing form: I’ll take responsibility for checking the figures.
Look at what the feedback explains: the form after the preposition, word choice, or the grammar of the sentence. Then change the task from checking figures to arranging a trip. This tests whether you can apply the correction without a model. For more concrete feedback, see LetsWords feedback examples. Six more common mistakes, each with a free sentence check, are covered in Check an English sentence online.
In the LetsWords vocabulary trainer, this practice continues through ready-made sets and personal collections. You can add words from emails, use English definitions, adjust the available help, and choose brief or detailed explanations.
Choose LetsWords if you want to stop repeating a familiar mistake and use learned vocabulary independently. It connects a correction to another attempt and later review, so learning continues after you accept the change. Start learning: the usual onboarding helps you select your goal and level, and you can try the feedback before paying.