Our rating: 4/5 for this setup

Grammarly-style proofreading with a local AI model and a minimal-edit prompt

The writer pastes their own finished draft into a small AI model running on their laptop or phone, with a prompt that says to fix only typos, grammar and awkward phrasing and leave tone and wording alone. The text comes back almost unchanged, with mistakes fixed, and never leaves the device.

New Added Oct 17, 2026 · ✓ Last checked Oct 17, 2026

It broke for meBroke?

Diagram drawn by AppToBot from this recipe's source. It shows the flow, not a screenshot of the product.

Setup steps

Install an app that runs small open models on your laptop or phone
Download a small model (the writer uses Gemma 4)
Save a prompt asking for very minor edits only: typos, grammar, awkward phrasing; keep tone, structure and wording
Paste your finished draft, then the prompt
Read the result and keep only the changes you agree with

Steps summarized from the original Blog source ↗. Use “Copy” to grab them with the tools and source link, or copy an AI prompt.

How it went

The writer replaced Grammarly with this and has used the prompt for months. They get essentially the same text back, with typos and obvious grammar mistakes fixed and the occasional awkward sentence smoothed out.

Worth knowing

They run it on a MacBook with only 8GB of RAM and on an iPhone; small models are enough for proofreading. Their reason to go local: drafts can include embargoed material they don't want to paste into cloud AI.

Only what the original source ↗ says, re-read Oct 17, 2026. How we write these

Try it with AI

Paste this into ChatGPT, Claude or your own agent for step-by-step help. Prompt written by AppToBot from this recipe's data, not by the original author. It keeps drafts for your review and asks before anything is sent or paid.

Help me set up this automation using Gemma 4 (local model) + a minimal-edit prompt: "Grammarly-style proofreading with a local AI model and a minimal-edit prompt".
Goal: replace Grammarly.

How it should work:
- Trigger: You finish a draft
- Then: Paste it with a minimal-edit prompt
- Then: A local model fixes typos, grammar and awkward phrasing
- Result: Your text back, nearly unchanged, with mistakes fixed

Setup steps (summarized from the original source):
1. Install an app that runs small open models on your laptop or phone
2. Download a small model (the writer uses Gemma 4)
3. Save a prompt asking for very minor edits only: typos, grammar, awkward phrasing; keep tone, structure and wording
4. Paste your finished draft, then the prompt
5. Read the result and keep only the changes you agree with

Guide me one step at a time. Ask me for anything you need (accounts, sheet or channel names) before you start.

Safety rules:
- Build and test with sample data first, and show me a sample result before anything goes live.
- Keep anything that goes to other people (emails, posts, replies, record updates) as drafts for my review until I say otherwise.
- Never send, post, buy, pay, delete or change records without my approval.
- Tell me about any cost (paid plans, API usage) before I'd incur it, and help me set a spending limit.
- Keep API keys and passwords out of shared docs and chats.
- Privacy: Drafts stay on your device with a local model (the writer moved off cloud chatbots for this reason).

Based on: https://www.xda-developers.com/replaced-grammarly-with-a-local-llm/

GrammarlyGemma 4 (local model) + a minimal-edit prompt

Tool names link to each official site (opens in a new tab).

Cost afterFree (open model on your own device)

SetupEasy · Not reported

Time savedNot reported

SkillBeginner

Running cost: Free to run Runs an open model on the writer's own laptop and phone; no subscription or API named. Self-hosted No-code How we sort costs
Replace an app: AI bots that replace Grammarly

App vs bot, side by side

Old app vs bot
	Old app / habit	Bot
Tool	Grammarly	Small local AI model (the writer uses Gemma 4) + a strict 'change as little as possible' prompt
Monthly cost	Not reported	Free (open model on your own device)
Setup	None (already in use)	Not reported · Beginner
Your time	Baseline	Not reported
Maintenance	Handled by vendor/you as before	Little: keep the prompt; try a newer small model when one comes out.
Privacy	Data stays with the app vendor	Drafts stay on your device with a local model (the writer moved off cloud chatbots for this reason).

Full comparison

Replaces	Grammarly
Bot / agent stack	Small local AI model (the writer uses Gemma 4) + a strict 'change as little as possible' prompt
Monthly cost before	Not reported
Monthly cost after	Free (open model on your own device)
Setup time	Not reported
Time saved	Not reported
Skill level	Beginner
Reliability	4/5: months of reported use, and a human checks every edit because you paste the text in and read what comes back.
Maintenance	Little: keep the prompt; try a newer small model when one comes out.
Privacy & data	Drafts stay on your device with a local model (the writer moved off cloud chatbots for this reason).
Best for	Writers who want typo and grammar fixes, not AI rewrites
Not for	People who want live suggestions inside every app

Pros and cons

Pros

Fixes mistakes without rewriting your voice
Runs on an 8GB laptop or a phone, per the writer
Nothing leaves your device

Cons

Paste-in, not live suggestions as you type
Results depend on the model following the prompt

Source and evidence

First-person XDA Developers article (Oct 2026): the writer says they've used the same prompt 'for months' and a local model on their iPhone for months. You read every result yourself.

Read the original Blog source ↗

“Not reported” means the source doesn't say. We never fill gaps with guesses. Numbers marked “per author” or “vendor claim” are the source's own and weren't independently tested. Source last checked Oct 17, 2026.

Our rating is an editorial opinion based on the public source above, not lab testing. Spot an error? Request a correction.

Plain-text summary (for search and AI assistants)

Grammarly-style proofreading with a local AI model and a minimal-edit prompt. Replaces Grammarly with Small local AI model (the writer uses Gemma 4) + a strict 'change as little as possible' prompt. Cost before: Not reported. Cost after: Free (open model on your own device). Setup: Not reported, Beginner. Time saved: Not reported. Reliability 4/5: 4/5: months of reported use, and a human checks every edit because you paste the text in and read what comes back. Best for: Writers who want typo and grammar fixes, not AI rewrites. Not for: People who want live suggestions inside every app. How it went (per source): The writer replaced Grammarly with this and has used the prompt for months. They get essentially the same text back, with typos and obvious grammar mistakes fixed and the occasional awkward sentence smoothed out. Worth knowing: They run it on a MacBook with only 8GB of RAM and on an iPhone; small models are enough for proofreading. Their reason to go local: drafts can include embargoed material they don't want to paste into cloud AI. Source: https://www.xda-developers.com/replaced-grammarly-with-a-local-llm/

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